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1.
Zootaxa ; 4755(3): zootaxa.4755.3.3, 2020 Mar 25.
Artigo em Inglês | MEDLINE | ID: mdl-32230168

RESUMO

The family Sphaerolaimidae Filipjev, 1918 combines nematodes characterized by finely striated cuticle, round amphids, broad buccal cavity with longitudinal ribs, and females with one anterior ovary. Sphaerolaimus Bastian, 1865 species from this family are found in intertidal and subtidal sediments and have also been reported from mangroves and estuary. Three new species of Sphaerolaimus were found and described from the South China Sea. Sphaerolaimus callisto sp. nov. is characterized by the relatively long body, small amphids and long spicules. Sphaerolaimus callisto sp. nov. is similar to S. cuneatus Paramonov, 1929, but differs by the longer body (2350-2690 µm vs 1980-1990 µm), index b (5.1-5.6 vs 3.9-4.1), absence of precolacal supplements, and longer spicules (321-356 µm vs 270 µm). Sphaerolaimus ganymede sp. nov. is characterized by large amphids and the presence of sexual dimorphism in amphid size. Sphaerolaimus ganymede sp. nov. is close to Sphaerolaimus maeoticus Filipjev, 1922, but differs by the presence of lateral alae, indexes a (12.3-17.5 vs 20-27) and c (7.9 vs 9-10), bigger amphids in male (14.6-15.7 µm vs 11 µm). Sphaerolaimus io sp. nov. is characterized by small amphids and short apophyses of gubernaculum. Sphaerolaimus io sp. nov. is similar to Sphaerolaimus pacificus Allgen, 1947, but differs by bigger size (1480-1525 µm vs 1140 µm), presence of lateral alae, and index c (7.5-8 µm vs 14.3 µm). After critical evaluation of the genus we recognize 35 valid species and provide dichotomous and pictorial keys to species.


Assuntos
Nematoides , Animais , China , Cromadoria , Feminino , Masculino , Boca
2.
Zootaxa ; 4732(2): zootaxa.4732.2.7, 2020 Feb 12.
Artigo em Inglês | MEDLINE | ID: mdl-32230264

RESUMO

Two nematode species isolated from sediments of the littoral zone of the South China Sea on the coast of Vietnam are described and illustrated. Microlaimus capitatus sp. n. is closely related to M. affinis Gerlach, 1958 and M. amphidius Kamran et al., 2009, but differs by having a thin, poorly developed pharyngostom, more posterior vulva and presence of terminal setae on the tail. The female of Dichromadora simplex Timm, 1961 is described and illustrated for the first time.


Assuntos
Cromadoria , Nematoides , Animais , Feminino , Vietnã
3.
Zootaxa ; 4722(4): zootaxa.4722.4.6, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-32230618

RESUMO

Polkepsilonema arabicensis sp. n. is discovered from the coralline sand of Lakshadweep island, located off the south-western coast of India. The species differs from other congeners by its unique combination of characters: presence of fine spines along the body curvatures, 5-6 rows of bisinuous ambulatory setae, male with two clusters of ventral copulatory thorns and 14 subcephalic sensilla. The novel species is the fourth discovery of the genus and first record from the coastal areas of Indian subcontinent. A key to species level is provided.


Assuntos
Nematoides , Animais , Cromadoria , Índia , Masculino
4.
Zootaxa ; 4722(1): zootaxa.4722.1.1, 2020 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-32230635

RESUMO

Free-living marine nematodes of continental shelf of Portugal were studied through the goals of the Marine Biodiversity Information System Project (M@rbis 2015). Four species unknown to science and belonging to the families Axonolaimidae, Chromadoridae, Desmodoridae and Xyalidae are described. Besides Hypodontolaimus golikovy, Hypodontolaimus portuguese sp. n. is the only species in this genus which lacks precloacal supplements and gubernaculum but differs from the former mainly in cephalic setae length and amphidial fovea features. Metachromadora aliusa sp. n. doesn't have a unique diagnostic character, differing in many aspects from the other species of the genus instead, mainly teeth number in the buccal cavity, size of the cephalic setae and the amphidial fovea, velum presence in the spicules, number and shape of the precloacal supplements. The main character of Odontophora sinapophysis sp. n. is the absence of apophysis in the gubernaculum. Stylotheristus multipapillatus sp. n. is characterized by the presence of precloacal supplements (papilliform) and the gubernaculum formed by only a piece.


Assuntos
Nematoides , Animais , Cromadoria , Portugal
5.
Zootaxa ; 4578(1): zootaxa.4578.1.1, 2019 Apr 09.
Artigo em Inglês | MEDLINE | ID: mdl-31715706

RESUMO

Chromadoridae is a widespread family of mostly free-living marine nematodes. This systematic review provides for each genus: a historical background, an updated diagnosis and a list of species. Our review recognizes 37 valid genera, 395 valid species, 57 descriptions without enough morphological information for accurate identification (species inquirenda) and 10 species incerta sedis. We also recognize 21 species as nomena nuda. Additionally, polytomous keys were constructed for the subfamilies and for the genera of the three major subfamilies (Chromadorinae, Euchromadorinae and Hypodontolaiminae) using the most important diagnostic characters. A phylogenetic analysis based on rDNA sequences of species available in the GenBank was also conducted. Phylogenetic trees based on the 18S and 28S rDNA confirmed the classification into three subfamilies (Spilipherinae, Hypodontolaiminae and Chromadorinae), despite the absence of defined synapomorphies. Phylogenetic relationships at lower taxonomic level are problematic given the large number of sequences not identified to species level.


Assuntos
Cromadoria , Nematoides , Animais , DNA Ribossômico , Filogenia
6.
Zootaxa ; 4615(2): zootaxa.4615.2.5, 2019 Jun 13.
Artigo em Inglês | MEDLINE | ID: mdl-31716345

RESUMO

Three new species representing a new genus of marine nematodes were collected on the continental shelf of the Potiguar Basin, northeastern Brazil. Spinonema gen. n. has a coarsely annulated cuticle with the inner layer ornamented with vacuoles, and lateral alae. The lateral alae are formed by raised and bent lateral sections of annules, resembling the letter C. C-shaped refers to each individual segment of ala. Some species have a dorsal spine, arched spicules and a well-developed head capsule, with a thick cuticle without annulations. Spinonema gen. n. has some features in common with certain genera of the family Desmodoridae but can be distinguished by the coarse body annuli, cuticular ornamentation (lateral alae, and in some species a dorsal spine) and the absence of subcephalic setae. The type species of the new genus, Spinonema cuticulatum gen. et sp. n., is characterized by the presence of a spiral fovea amphidialis, hook-shaped spicules in the capitulum, a velum and three ejaculatory glands. Spinonema spirale gen. et sp. n. has body annuli with the inner cuticle ornamented with vacuoles along the entire body, a multispiral fovea amphidialis with 3.15 turns and a gubernaculum intricate, with lateral crurae. Dorsal apophysis of gubernaculum wing-shaped. Spinonema absente gen. et sp. n. has a cryptospiral fovea amphidialis, short spicules, a simple gubernaculum and three precloacal setae.


Assuntos
Nematoides , Thoracica , Animais , Brasil , Cromadoria
7.
Zootaxa ; 4614(2): zootaxa.4614.2.7, 2019 Jun 10.
Artigo em Inglês | MEDLINE | ID: mdl-31716383

RESUMO

Two new species of the family Xyalidae from the Laizhou Bay of the Bohai Sea, China are described and illustrated herein. Daptonema papillifera sp. nov. is characterized by relatively small body size, L-shaped spicules with a large cephalate proximal end, triangular gubernaculum with a dorsal apophysis, 5-6 conjoint precloacal cuticularized spines and two ventral papillae located at the middle of the tail. Daptonema papillifera sp. nov. is easily distinguished from the other species in this genus by having 5-6 conjoint precloacal cuticularized spines and two ventral caudal papillae. Pseudosteineria anteramphida sp. nov. is characterized by eight groups of long subcephalic setae located posterior to amphideal fovea, curved slender spicules with cephalate proximal end and tapered distal end, tubular gubernaculum without apophysis, precloacal supplements absent, and a short precloacal seta present. In comparison with its most similar congeneric species, P. ventropapillata Tchesunov, 2000 the new species differs in having smaller body, not jointed cephalic setae, absence of precloacal supplements and absence of gubernacular apophysis.


Assuntos
Nematoides , Animais , Baías , Tamanho Corporal , China , Cromadoria
8.
Zootaxa ; 4695(2): zootaxa.4695.2.10, 2019 Nov 07.
Artigo em Inglês | MEDLINE | ID: mdl-31719361

RESUMO

A new free-living marine nematode species from marine sediments in the East China Sea, is described here as Perspiria boucheri sp. nov. The new species is characterized by amphideal fovea surrounded partially by body annulations; four cephalic setae stout; conical buccal cavity with a minute dorsal tooth and two ventrosublateral teeth; pharynx with a pyriform terminal bulb; tail elongated, conical with 3/4 posterior cylindrical portion which having distinct coarse annulations; spicules strongly curved with narrow ventral velum, handle-shaped proximally; gubernaculum canoe-shaped, without apophysis. The new species differs from the most similar species Perspiria striaticaudata (Timm, 1962) by strongly curved spicules with handle-shaped proximal end, gubernaculum without dorsal apophysis and relatively shorter tail. Updated key to all species of Perspiria is provided.


Assuntos
Nematoides , Animais , China , Cromadoria
9.
Zootaxa ; 4691(1): zootaxa.4691.1.5, 2019 Oct 29.
Artigo em Inglês | MEDLINE | ID: mdl-31719415

RESUMO

A new species of free-living marine nematode is described from Itapuã beach, northeast of Brazil. Pomponema veronicae sp. n. differs from other species of Pomponema by having buccal cavity with large pointed dorsal tooth, two subventral teeth and pairs of denticles, gubernaculum with two L-shaped lateral plates and having a membrane at its distal end that connects to L-shaped plate, and presence of a ventral orifice at distal end of L-shaped plates. It also differs from other species in the size of spicules and gubernaculum. The new species is considered most closely related to Parapomponema species because of the L-shaped lateral plates of gubernaculum, but the taxonomic status of Parapomponema was reviewed and Parapomponema and Propomponema are now synonymized with Pomponema. Pomponema cyatholaimoides is considered as a species inquirendum and Pomponema carinatum is accepted as Pomponema loticum. An updated identification key to species of Pomponema is included.


Assuntos
Nematoides , Animais , Brasil , Cromadoria
10.
Zootaxa ; 4651(2): zootaxa.4651.2.1, 2019 Aug 05.
Artigo em Inglês | MEDLINE | ID: mdl-31716907

RESUMO

Aphanolaimus strilliae n. sp. and Makatinus africanus n. sp. are described from freshwater sources in the Telperion Nature Reserve, Mpumalanga, South Africa. Aphanolaimus strilliae n. sp. is characterised by a body length of 1240-1613 µm, more than 800 body annules, lateral field originating between the first and second lateral body pore at the 34th-46th annule, first lateral body pore located at the 25th-35th annule, vagina V-shaped and bent anteriorly, 142-195 µm long uterus and 165-207 µm long tail with spinneret offset. This species is ovoviviparous and no males were found. Makatinus africanus n. sp. is characterised by a large, thick body (3228-4128 µm long, a = 30-39 wide), slightly set off lip region with amalgamated lips; 31-34 µm long odontostyle; long tongue-shaped cardia, and stout, short tail (30-43 µm long) with a small peg / digitate extension and male absent. Populations of three known species, Chronogaster africana, Eutobrilus annetteae and Neotobrilus ampiei, from fresh water at the Telperion Nature Reserve are described and scanning electron microscope graphs of these species published for the first time.


Assuntos
Helmintos , Nematoides , Animais , Cromadoria , Feminino , Água Doce , Masculino , África do Sul
11.
Zootaxa ; 4646(1): zootaxa.4646.1.2, 2019 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-31717025

RESUMO

Four new free-living marine nematode species of the genus Sabatieria are described from the Chukchi Sea. Sabatieria chukchensis sp. n. is characterized by a long body (2052-2326 µm), two pairs of short cervical setae present, amphideal fovea spiral with 2.75-3.25 turns, and seven papilliform pre-cloacal supplements. Sabatieria parvamphis sp. n. is characterized by small amphideal fovea (equal to 55-72% corresponding body diameter), amphideal fovea spiral with 3.25 turns, short cephalic setae (6-7 µm, equal to 31-38% of head diameter), curved gubernacular apophyses, thirteen to fifteen prominent tubular pre-cloacal supplements with distance between adjacent supplements increasing towards the anterior. Sabatieria major sp. n. is characterized by a long body (3879-4255 µm), amphideal fovea spiral with 2.5-3.25 turns, and seventeen to thirty-two small tubular pre-cloacal supplements. Sabatieria multisupplementia sp. n. is characterized by a long body (3967-4294 µm), amphideal fovea spiral with 2.75-3 turns, and forty-one to forty-seven tubular pre-cloacal supplements.


Assuntos
Nematoides , Animais , Cromadoria
12.
Zootaxa ; 4608(3): zootaxa.4608.3.2, 2019 May 21.
Artigo em Inglês | MEDLINE | ID: mdl-31717131

RESUMO

Three new species of the free-living marine nematode genus Dorylaimopsis are described from the South China Sea and the Chukchi Sea. Dorylaimopsis longispicula sp. n. is characterized by cuticle with lateral differentiation consisting of four longitudinal rows of larger dots in pharyngeal and tail regions, two rows of larger dots elsewhere, long curved spicules, and 12-16 tubular precloacal supplements. Dorylaimopsis boucheri sp. n. is characterized by lateral differentiation consisting of 3-4 longitudinal rows of larger dots in males and 4-6 rows in females, beginning about 30 µm posterior to amphids and terminating at the conical portion of the tail, 13-16 tubular precloacal supplements, and distal part of tail cylindrical without terminal setae. Dorylaimopsis jinyuei sp. n. is characterized by cuticle with lateral differentiation in the form of longitudinal rows of larger dots in two separate regions, not along entire body. One region is from posterior edge of amphid to anterior of intestine or anterior border of pharyngeal bulb in some females (4-7 longitudinal rows), the other is the tail region (5-7 longitudinal rows). In this paper, Dorylaimopsis metatypica Chitwood, 1936 is transferred to Hopperia because it is characterized by lateral differentiation consisting of larger, irregularly-distributed coarse dots (as in Hopperia), and Hopperia communis Gagarin Nguyen, 2006 is transferred to Dorylaimopsis based on the presence of longitudinal rows of coarse dots and a cylindrical buccal cavity in most specimens of this species. A dichotomous key to valid species of Dorylaimopsis Ditlevsen, 1918 is provided.


Assuntos
Nematoides , Animais , China , Cromadoria , Feminino , Masculino
13.
Zootaxa ; 4603(3): zootaxa.4603.3.9, 2019 May 10.
Artigo em Inglês | MEDLINE | ID: mdl-31717219

RESUMO

A new free-living marine nematode species of the genus Elzalia belonging to the family Xyalidae is described from the seabed sediment of the northeast region of the South China Sea. Elzalia heterospiculata sp. nov. is characterized by elongated spicules unequal in length, left spicule prominently longer than right spicule, ratio of body length to spicule length is 4.7-6.2; complex gubernaculum consisting of four sections, apophyses clavate, 12-14 µm long; and amphideal fovea positioned near the top of the head. It is similar to E. federici Castillo-Fernandez and Lambshead, 1990 and E. floresi Gerlach, 1957. However, the new species differs from the similar two species in having markedly unequal spicules, complex gubernaculum consisting of four sections, amphideal fovea close to the top of the head. Updated key to all species of Elzalia is provided.


Assuntos
Nematoides , Animais , Osso e Ossos , China , Cromadoria , Cabeça
14.
Curr Opin Insect Sci ; 33: 77-83, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-31358200

RESUMO

Many insect species derive fitness benefits from associations with defensive microbial symbionts that confer protection against pathogens and parasites. These relationships are varied and diverse, but a number of studies highlight important trends. The effects of defensive symbionts can be context-dependent and influenced by variable selection imposed by the organism against which the symbiont protects. Additionally, genetic variation in both hosts and symbionts can greatly influence the outcome of these interactions. Here, we describe interactions between siricid woodwasps, their fungal symbionts and parasitic nematodes and show how defense by symbionts in this system is also context-dependent. The species or strain of the white rot fungus used as a symbiont by Sirex can influence parasitism of these hosts by Deladenus nematodes.


Assuntos
Simbiose , Vespas/microbiologia , Vespas/parasitologia , Animais , Basidiomycota/fisiologia , Cromadoria/patogenicidade , Larva/microbiologia , Larva/parasitologia , Vespas/crescimento & desenvolvimento
15.
Molecules ; 24(9)2019 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-31058826

RESUMO

Eugenia winzerlingii (Myrtaceae) is an endemic plant from the Yucatan peninsula. Its organic extracts and fractions from leaves have been tested on two phloem-feeding insects, Bemisia tabaci and Myzus persicae, on two plant parasitic nematodes, Meloidogyne incognita and Meloidogyne javanica, and phytotoxicity on Lolium perenne and Solanum lycopersicum. Results showed that both the hexane extract and the ethyl acetate extract, as well as the fractions, have strong antifeedant and nematicidal effects. Gas chromatography-mass spectrometry analyses of methylated active fractions revealed the presence of a mixture of fatty acids. Authentic standards of detected fatty acids and methyl and ethyl derivatives were tested on target organisms. The most active compounds were decanoic, undecanoic, and dodecanoic acids. Methyl and ethyl ester derivatives had lower effects in comparison with free fatty acids. Dose-response experiments showed that undecanoic acid was the most potent compound with EC50 values of 21 and 6 nmol/cm2 for M. persicae and B. tabaci, respectively, and 192 and 64 nmol for M. incognita and M. javanica, respectively. In a phytotoxicity assay, medium-chain fatty acids caused a decrease of 38-52% in root length and 50-60% in leaf length of L. perenne, but no effects were observed on S. lycopersicum. This study highlights the importance of the genus Eugenia as a source of bioactive metabolites for plant pest management.


Assuntos
Antinematódeos/farmacologia , Eugenia/química , Ácidos Graxos/farmacologia , Inseticidas/farmacologia , Animais , Antinematódeos/química , Cromadoria/efeitos dos fármacos , Ácidos Graxos/química , Cromatografia Gasosa-Espectrometria de Massas , Hemípteros/efeitos dos fármacos , Inseticidas/química , Lolium/efeitos dos fármacos , Lycopersicon esculentum/efeitos dos fármacos , Estrutura Molecular , Controle de Pragas , Folhas de Planta/química , Folhas de Planta/efeitos dos fármacos , Folhas de Planta/crescimento & desenvolvimento , Raízes de Plantas/efeitos dos fármacos , Raízes de Plantas/crescimento & desenvolvimento
16.
BMC Ecol ; 19(1): 15, 2019 03 29.
Artigo em Inglês | MEDLINE | ID: mdl-30925873

RESUMO

BACKGROUND: By altering their habitats, engineering species can improve their own fitness. However, the effect of this strategy on the fitness of coexisting species or on the structure of the respective food web is poorly understood. In this study, bacteria and bacterivorous nematodes with short (Caenorhabditis elegans) and long (Plectus acuminatus) life cycles were exposed to the mucus secreted by the freshwater flatworm Polycelis tenuis. The growth, reproduction, and feeding preferences of the nematodes in the presence/absence of the mucus were then determined. In addition, confocal laser scanning microscopy (CLSM) was used to examine the structural footprint of the mucus and the mucus colonization dynamics of bacteria and protozoans. RESULTS: Mucus exposure resulted in a greater reproductive output in P. acuminatus than in C. elegans. In a cafeteria experiment, both nematode species were attracted by bacteria-rich patches and were not deterred by mucus. CLSM showed that the flatworms spread a layer of polysaccharide-rich mucus ca. 15 µm thick from their tails. Subsequent colonization of the mucus by bacteria and protozoans resulted in an architecture that progressively resembled a complex biofilm. The presence of protozoans reduced nematode reproduction, presumably due to competition for their bacterial food supply. CONCLUSION: Animal secretions such as mucus may have broader, community-level consequences and contribute to fueling microbial food webs.


Assuntos
Cromadoria/fisiologia , Cadeia Alimentar , Muco/fisiologia , Turbelários/fisiologia , Animais , Fenômenos Fisiológicos Bacterianos , Caenorhabditis elegans/fisiologia
17.
Rev Bras Parasitol Vet ; 28(1): 12-32, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30892463

RESUMO

In Brazil there are several records of parasitic nematodes of fish with zoonotic potential, especially those belonging to the family Anisakidae. This study considers the morphology, morphometry and prevalence of Contracaecum in Astronotus ocellatus , fish consumed in the Amazon and sold as ornamental and it also performs a retrospective analysis of the diversity of fish with larvae of Contracaecum, in studies carried out in Brazil over a period of 90 years. 40 specimens of A. ocellatus were necropsied, and the nematodes were collected and fixed in 93 parts 70% ethyl alcohol, 5 parts formaldehyde, and 2 parts glacial acetic acid (AFA) for morphological analysis under light microscopy and scanning electron microscopy. Of the 40 fish collected during this work, 27 were parasitized by Contracaecum larvae with a total intensity of 150 larvae. Retrospective analysis of intermediate host diversity for Contracaecum larvae resulted in 16 orders, 49 families, 96 genera, 140 species and a hybrid morphotype. In the retrospective study, half of the fish were from freshwater, with the order Perciformes being the most representative, with 16 families, 30 genera and 37 species. In Brazil, the occurrence of larvae of Contracaecum in fish was reported in 15 of the 26 states, with Rio de Janeiro presenting the most information regarding fish harboring Contracaecum larvae.


Assuntos
Cromadoria/ultraestrutura , Ciclídeos/parasitologia , Animais , Cromadoria/classificação , Cromadoria/isolamento & purificação , Feminino , Geografia , Larva/classificação , Larva/ultraestrutura , Masculino , Prevalência , Estudos Retrospectivos , Medição de Risco , Zoonoses
18.
N Z Vet J ; 67(1): 40-45, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30295177

RESUMO

AIMS To investigate the timing of infection of beef calves with sheep nematode species on three sheep and beef farms, and to determine the prevalence of cross-infection in calves before weaning across a larger number of farms. METHODS Farms in the Far North, Gisborne and Tararua districts, in the North Island of New Zealand, were enrolled in 2014. Fresh faecal samples were collected from approximately 10 calves on each farm between birth and up to 5 months after weaning. In 2016, faecal samples were collected from calves before weaning from 22 farms across the upper North Island. For both trials faecal samples were assessed for faecal nematode egg counts and cultured to determine parasite genus. For samples from the three farms, larvae were identified to species using a multiplex PCR assay. RESULTS On the three farms, the median percentage of sheep nematode species detected in faecal cultures was 25 (min 3, max 77)%. The main sheep species detected were Cooperia curticei and Haemonchus spp. (putatively contortus). In faecal samples collected before weaning from 22 farms, Haemonchus spp. were present in 19/22 samples, and the median prevalence was 15 (min 0, max 73)% of the total larvae cultured. CONCLUSIONS AND CLINICAL RELEVANCE The implications of sheep nematode species being present in calves should be considered by farmers and veterinarians when undertaking anthelmintic efficacy testing, as they may contribute to false conclusions regarding anthelmintic efficacy. Pre-weaning calves may also be a possible source of contamination and/or refugia for Haemonchus spp. on farms and should be considered when developing parasite control plans for sheep.


Assuntos
Doenças dos Bovinos/parasitologia , Doenças dos Bovinos/transmissão , Infecções por Nematoides/transmissão , Doenças dos Ovinos/parasitologia , Criação de Animais Domésticos , Animais , Bovinos , Cromadoria/isolamento & purificação , Fezes/parasitologia , Hemoncose/veterinária , Haemonchus/isolamento & purificação , Nematoides/isolamento & purificação , Nova Zelândia/epidemiologia , Contagem de Ovos de Parasitas/veterinária , Reação em Cadeia da Polimerase/veterinária , Ovinos
19.
Zootaxa ; 4394(1): 77-94, 2018 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-29690383

RESUMO

Daptonema chonispiculum sp. n. and D. phuketense sp. n. are described from the Ban Pa Khlok seagrass bed, Phuket Province, Thailand. Daptonema chonispiculum sp. n. is characterized by spicules with funnel-shaped proximal ends, and D. phuketense sp. n. is unique in having the third caudal gland filled with fibrous contents. Each new species also differs from most related species in body length, de Man's indices, length of the cephalic setae and somatic/cervical setae, distance of the amphids from the anterior of the body, and length of the spicules. The new species most closely resemble D. hirsutum, D. platonovae, and D. robustum, with similar body lengths, long cervical setae located in the anterior pharyngeal region, small amphids, L-shaped spicules and a gubernaculum with a long dorso-caudal apophysis. Regarding the taxonomic status of Daptonema and Trichotheristus, we agree with the synonymization of Trichotheristus with Daptonema by Tchesunov (1990), based on taxonomic review of Trichotheristus and a comparison of the diagnostic features separating the genera. We propose a new combination, Daptonema galeatum comb. n., and a new name, Daptonema nearticulatum sp. n. for Trichotheristus articulatus Huang Zhang, 2006.


Assuntos
Nematoides , Animais , Cromadoria , Ecossistema , Tailândia
20.
Zootaxa ; 4407(4): 573-581, 2018 Apr 12.
Artigo em Inglês | MEDLINE | ID: mdl-29690175

RESUMO

Two new free-living marine nematode species of the genus Paracomesoma and genus Metacomesoma belonging to family Comesomatidae are described from the sublittoral sediment of the East China Sea. Paracomesoma zhangi sp. nov. is characterized by cuticle with fine transverse rows of dots, without lateral differentiation; buccal cavity with three small teeth; cephalic setae 13.5 µm long; multispiral amphideal fovea with three turns; spicules slender and elongated with thick cuticularized proximal end; gubernaculum plate-like without apophysis; 26 minute precloacal supplements. Metacomesoma macramphida sp. nov. is characterized by very small buccal cavity without teeth; inner and outer labial sensilla papilliform; four cephalic setae 1.5 µm long; multispiral amphideal fovea large, with 4.5 turns; spicules slender and elongated, with cephalated proximal end and finger-shaped distal end; gubernaculum plate-like, without apophysis; precloacal supplements absent. An updated dichotomous key for the identification of the males of the species of Paracomesoma is provided.


Assuntos
Nematoides , Animais , China , Cromadoria , Masculino
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