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1.
Zootaxa ; 4613(2): zootaxa.4613.2.1, 2019 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-31716410

RESUMO

For the first time large numbers of thecideide brachiopods have been collected from the Mozambique Channel, more particularly from the western part of the Comorian Island of Mayotte (France). The moderately diverse brachiopod fauna is from a submarine cave situated on the second barrier reef encircling this island, with three different genera being found: Thecidellina, Ospreyella and Minutella. The last genus is represented by M. cf. minuta (Cooper, 1981), which was first discovered around Madagascar. Ospreyella is represented by a new species (O. mayottensis sp. nov.) as is Thecidellina, which is represented by T. leipnitzae sp. nov. This species is markedly distinct from T. europa Logan et al., 2015 from Europa Island in the southern Mozambique Channel (1,200 km south of Mayotte), providing an example of allopatric speciation in an isolated cryptic habitat.


Assuntos
Invertebrados , Animais , Comores , França , Ilhas , Madagáscar , Moçambique
2.
Zootaxa ; 4471(3): 535-555, 2018 Sep 06.
Artigo em Inglês | MEDLINE | ID: mdl-30313395

RESUMO

The genus Tethyrhynchia Logan in Logan Zibrowius, 1994 is revised on the basis of different methods of analysis including SEM observations, detailed ontogenetic study of the crural development, transverse serial sections, and shell microstructure. Some morphological characters cited in the original diagnosis are analysed and contested by the ontogenetic results. The type of crura of Tethyrhynchia, often placed in the arcual group, appears to be of the raducal group, instead. Paedomorphosis and heterochronic development offer the possibility of opening a dialogue between morphological and phylogenetic approaches to classification of rhynchonellide brachiopods.


Assuntos
Invertebrados , Filogenia , Animais
3.
Zootaxa ; 4444(1): 1-24, 2018 Jul 06.
Artigo em Inglês | MEDLINE | ID: mdl-30313939

RESUMO

Size reduction and development of a simplified brachidial structure occurred several times during the long evolution of the Phylum Brachiopoda. Even Recent forms may be micromorphic and paedomorphic with reduced brachidia or none at all. A revision of the Maastrichtian (Late Cretaceous) Terebratella (Morrisia?) suessi Bosquet, 1859 has allowed us to erect a new genus, Jagtithyris gen. nov., because its singular brachidium development does not match any platidiid structure. Such a brachidium has also been observed in another European Late Cretaceous brachiopod, which indicates that this type was not a unique morphological curiosity. This species is the micromorphic Campanian-Maastrichtian Leptothyrellopsis polonicus Bitner Pisera, 1979, which has brachidial structures in common with Jagtithyris suessi comb. nov., although a number of differences have been observed. The genera Leptothyrellopsis and Jagtithyris gen. nov., are included in a new family, Jagtithyrididae fam. nov. During an ongoing revision of extant brachiopod faunas we have been led to recognize a link between this family and representatives of the genus Simplicithyris Zezina, 1976. The taxonomic position of this peculiar group is also discussed.


Assuntos
Invertebrados , Animais
4.
Zootaxa ; 4526(4): 481-515, 2018 Dec 03.
Artigo em Inglês | MEDLINE | ID: mdl-30651502

RESUMO

The scope of this paper concerns the species diversity of thecideide brachiopods living in the western Pacific equatorial region of Indonesia and the possibilities for circulation and dispersion of thecideide species along the coasts of Sulawesi and the Sea of Bali. The discovery of a new Thecidellina species, Thecidellina mawaliana sp. nov., adds a new genus to the Indonesian fauna. This species has a peculiar biogeography, different from those of Minutella cf. minuta (Cooper, 1981) and Ospreyella mutiara Simon Hoffman, 2013, other thecideides living together with the new species. Unfortunately, attempts to collect molecular sequence information from the specimens failed due to insufficient DNA preservation. Probable speciation mechanisms in this genus are discussed.


Assuntos
Invertebrados , Animais , Indonésia
5.
Naturwissenschaften ; 104(11-12): 98, 2017 Nov 03.
Artigo em Inglês | MEDLINE | ID: mdl-29101477

RESUMO

The taxonomic affinities of fossils from the Frasnian succession of Belgium previously described as phyllopod and phyllocarid crustacean shields are discussed. The rediscovery of the holotype of Ellipsocaris dewalquei, the type species of the genus Ellipsocaris Woodward in Dewalque, 1882, allows to end the discussion on the taxonomic assignation of the genus Ellipsocaris. It is removed from the phyllopod crustaceans as interpreted originally and considered here as an ammonoid anaptychus. Furthermore, it is considered to be a junior synonym of the genus Sidetes Giebel, 1847. Similarly, Van Straelen's (1933) lower to middle Frasnian record Spathiocaris chagrinensis Ruedemann, 1916, is also an ammonoid anaptychus. Although ammonoids can be relatively frequent in some Frasnian horizons of Belgium, anaptychi remain particularly scarce and the attribution to the present material to peculiar ammonoid species is not possible.


Assuntos
Cefalópodes/anatomia & histologia , Cefalópodes/classificação , Fósseis , Animais , Bélgica , Filogenia , Especificidade da Espécie
6.
Zootaxa ; 4137(1): 1-34, 2016 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-27395738

RESUMO

Two new kraussinid brachiopod genera, namely Lenticellaria gen. nov. and Hillerella gen. nov. are described from Pacific waters in the sub-equatorial zone in the Indonesian Archipelago, from Indian Ocean waters in Madagascar and from Red Sea waters in Egypt (Gulf of Aqaba) and Sudan. This fills the equatorial gap in the distribution of the superfamily Kraussinoidea, known from higher latitudes in both hemispheres. The micromorphic new material described is an excellent example of homeomorphy in brachiopods. It also provides new information on the distribution of the genus Megerlia sensu stricto and illustrates subtle variations in the evolutionary process of the reduced brachidium in Kraussinoidea.


Assuntos
Invertebrados/classificação , Distribuição Animal , Estruturas Animais/anatomia & histologia , Estruturas Animais/crescimento & desenvolvimento , Animais , Tamanho Corporal , Ecossistema , Oceano Índico , Invertebrados/anatomia & histologia , Invertebrados/crescimento & desenvolvimento , Tamanho do Órgão , Oceano Pacífico
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