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Irfan Ahmad and Md Mahamood

Abstract

Two new species of diplogastrid nematodes from India are described and illustrated. Diplogasteroides uriceus sp. n. has a medium-sized body, monoprodelphic reproductive system lacking a post-uterine sac, anteriorly directed muscular vagina and vulva located far posterior; long, slender, arcuate spicules; gubernaculum with proximal thread-like flexible part and nine pairs of genital papillae of which four pairs are precloacal and five pairs postcloacal. The new species resembles D. crassus but can be most easily differentiated by the structure of the cheilorhabdions, shape and structure of the gubernaculum, arrangement of the genital papillae and the complete absence of a bursa. The new species also resembles D. proprius but can be differentiated by stoma structure, more anteriorly located vulva, longer spicules, gubernaculum shape and tail form. Rhabditidoides papillatus sp. n. is characterised by the presence of three pairs of post-deirids in the lateral fields, posteriorly curved tubular stoma, amphidelphic female reproductive system, strongly developed, arcuate spicules with bilobed capitulum and a slender gubernaculum provided with a sleeve distally and anteriorly directed bifid ends proximally. It can be distinguished from R. stigmatus by the structure of the spicule head, gubernaculum shape and arrangement of the genital papillae; from R. mastigurus by spicule structure and the gubernaculum shape; and from R. quercophilus by a more slender female body, stoma structure, absence of a male bursa, spicule form and arrangement of the genital papillae.

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Irfan Ahmad and M. Shamim Jairajpuri

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M. Shamim Jairajpuri and Irfan Ahmad

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Wasim Ahmad, Irfan Ahmad and Samina Shafqat

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Mohammad Mahamood, Ali Asghar Shah and Irfan Ahmad

Abstract

A new rhabditid nematode, Sclerorhabditis tridentatus gen. n., sp. n. is described and illustrated. The body is small, less than 0.5 mm, and has an unusual labial and cephalic organisation. The dorsal and ventral lips have strongly sclerotised tridentate structures with the free ends of the forks directed towards the stoma, and the anterior margins of the lateral lips are sclerotised. An unusual feature of this species is the contour of the cephalic border that has axillae-like structures on the lateral sides. The stoma is wide and lacks a glottoid apparatus. The females are amphidelphic with reflexed ovaries and elongate conoid tails. Males were not found. The new genus resembles Diploscapter and the related genus Carinoscapter in having membranous lateral lips, absence of glottoid apparatus and amphidelphic reproductive system, but is clearly distinguishable by the shape and orientation of the sclerotisation of the dorsal and ventral lips and by the presence of a cephalic border.

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Irfan Ahmad, Qudsia Tahseen and M. Shamim Jairajpuri

Abstract

Three populations belonging to Zeldia punctata , Chiloplacus subtenuis and Seleborca complexa , respectively, were studied morphometrically, with additional details provided by scanning electron microscopy. Z. punctata , Aligarh population, is characterised by a medium sized body with five non-crenate lateral incisures, prominently cuticularized cheilostom, dentate guard processes of primary cephalic axils reaching about 66% of cephalic probolae length. C. subtenuis, population collected from Surat, India, shows five lateral incisures, labial probolae bifurcate about 20% of length, with short and blunt margins, female tail long with 22-24 annules, without indented tip, males with four precloacal and four post-cloacal pairs genital papillae and with inner lateral incisures interrupted at tail. The Aligarh population of S. complexa shows double, coarsely striated cuticle, two areolated lateral incisures, labial probolae bifurcate to about 67% of length, each arm bearing seven to nine tines on the outer side, middle tine on cephalic probolae at secondary cephalic axils enlarged, males with strongly developed, cephalated spicules and with three paired and a single median pre-cloacal and five post-cloacal pairs of genital papillae. Observations sur trois especes de la sous-familledes Acrobelinae (Nematoda: Cephalobidae) de l'Inde- Trois populations appartenant chacune a Zeldia punctata , Chiloplacus tenuis et Seleborca complexa ont ete etudiees, des donnees complementaires en microscopie electronique a balayage etant fournies. Z. punctata , population Aligarh, est caracterise par un corps de taille moyenne avec cinq incisures laterales non crenelees, un cheilostome cuticularise proeminent, des proces de protection des axilles cephaliques primaires atteignant environ 66% de la longueur des proboles cephaliques. La population de C. subtenuis, collectee a Surat, Inde, montre cinq incisures laterales, des proboles labiales bifurquees a 20% de leur longueur et a sommets courts et lisses, la queue de la femelle comportant 22 a 24 anneaux et a extremite non indentee, les males avec quatre paires precloacales et quatre paires postcloacales de papilles genitales, les incisures laterales internes etant interrompues sur la queue. La population de S. complexa provenant d'Aligarh possede une cuticule double a annelation forte, deux incisures laterales areolees, des proboles labiales bifurquees a environ 67% de leur longueur, chaque branche portant sept a neuf pointes sur la marge exterieure, la pointe mediane elargie des proboles cephaliques au niveau des axilles cephaliques secondaires, les males a spicules fortement developpes et renfles a l'extremite anterieure, les papilles genitales etant reparties en trois paires pre-cloacales, une mediane unique pre-cloacale et cinq paires post-cloacales.