RESUMEN
A new genus and new species of the family Cephalobidae, subfamily Cephalobinae, named Spinocephalus tessellatus n. gen., n. sp. is described from Iran. Body 0.55-0.67 mm long, cuticle with tessellations, lateral field with two tessellated longitudinal wings, lip region with six triangular lips, primary axils deep and V-shaped with two conoid-elongate guard processes that originate from each lip, secondary axils deep and U-shaped with one thorn-like process (labial probolae?) in lateral view with a small rounded protuberance fused to the oral plate having triradiate symmetry more developed at the acute margin toward each primary axil, oral opening hexagonal, amphids large and clearly rounded to slightly oval, stoma cephaloboid with cheilostom with minute and rounded rhabdia, pharynx cephaloboid with corpus subcylindrical and isthmus very long being 1.4-1.7 times corpus length, nerve ring surrounds the isthmus, excretory pore at the level of the isthmus. Female monodelphic-prodelphic, spermatheca as long as the body diam., post-vulval uterine sac 0.8-1.0 times body diameter, tail conoid with small rounded terminus. Male monorchic, spicules 24-26 µm long, gubernaculum 11-14 µm long, tail conical and ventrally curved with small rounded terminus. Morphological, including SEM observations, and molecular (based on 18S and 28S rDNA) analyses revealed its relationship with the genera Acromoldavicus and Nothacrobeles.
RESUMEN
Discopersicus hexagrammatus n. sp., is described and illustrated from a population associated with the rhizosphere of carrot (Daucus carota L.) in Dezful, Khuzestan province, south-western Iran. Based on morphological and morphometric data, the new species is characterized by a 601-734 µm long body, a prominent perioral labial disc and oblique amphidial slits, 10-11 µm long stylet, vulva at 65-67% of body length, 15.5-17 µm long spicules, and an elongate conoid tail with a pointed terminus. It is the second species of the genus Discopersicus and differs from its counterpart D. iranicus, by its anterior position of vulva, shorter stylet, lower M.B. ratio, different shape of tail tip, and shorter spicules in male specimens. A molecular phylogenetic analysis using the D2-D3 expansion segments of 28S rDNA sequences, placed the new species in close relationship with five sequences of the genus Boleodorus.
RESUMEN
Three species of the genus Neothada, including N. cancellata, N. hades and N. major, collected from the rhizosphere of mosses in Khuzestan, southwestern Iran, are redescribed and illustrated. Neothada hades and N. major are new records from Iran. Neothada hades has 14 longitudinal incisures excluding the lateral field, body length of 586 (505-674) µm, stylet 10.5 (10.0-10.8) µm in length bearing distinct basal knobs, and an elongated-conical tail 70.4 (65-74) µm long with a finely to bluntly rounded terminus. N. major possesses 18-20 longitudinal incisures excluding the lateral field, body length of 657 (600-728) µm, stylet 10.9 (10.3-11.7) µm long with basal swellings but not distinct knobs, and an elongated-conical tail 78.2 (70-83) µm long ending to a finely to bluntly rounded terminus. Molecular phylogenetic studies of the two species (N. hades and N. major) with 664 bp of D2-D3 expansion segments of 28 S rDNA revealed that they form a clade with N. cancellata.
RESUMEN
Coslenchus paramaritus n. sp. and C. cancellatus were identified based on morphological, morphometric, and molecular characteristics. The new species, C. paramaritus n. sp., is characterized by its cuticle with 18 longitudinal ridges excluding lateral lines, wide cuticular annuli (2.6-3.0 µm), a long tail (94-128 µm), the presence of males and the absence of sexual dimorphism in head shape. Molecular phylogenetic studies of the new species using D2-D3 expansion segments of 28S rRNA revealed that the new species formed a sister clade with three unknown populations of Coslenchus in Bayesian inference (BI) phylogeny, while C. cancellatus formed a sister clade with other Coslenchus species including C. oligogyrus, C. franklinae, C. costatus, C. turkeyensis and three unknown populations. C. cancellatus is recovered from Iran for the first time.