Description of Trithornus aquatica gen. n. sp. n. (Nemtoda:Cephalobina) from aquatic habitat, India.

Document Type : Research articles

Author

aligarh muslim university

Abstract

Abstract: A new cephalobid nematode, Trithornus aquatica gen. n. sp. n. has been described and illustrated. The new genus can be distinguished by the unique shape of its labial probolae, consisting of swollen labial shaft and a trifurcated apical section. The cephalic probolae is triangular in shape. Cuticle is transversely annulated, lateral field with five incisors, outer ones being undulate. The stoma comprises of cheilostom with granular rhabdia, gymnostom narrower than cheilostom and stegostom. Stegostome can be differentiated into three parts meta, meso and telo. A tooth is present on mesostegostome. Females have cephaloboid type of reproductive system. Tail is elongate conoid with a pointed tip. Males were not found. The newly described genus closely resembles Acrobeles Linstow, 1877, Chiloplacus Thorne, 1937 and Cervidellus Thorne, 1937 in having similar stoma, furcated labial probolae, simple cuticle and cephaloboid type of female gonad with a post uterine sac. But, is clearly distinguishable by the related genera on the basis of the shape of labial probolae and the presence of outer undulated lateral lines. A dichotomous key to the identification of the genus has also been provided.

Keywords


Ali, M.A.S., Krishnamurthy, K., M.J.P. Jeyaseelan (1983) Energy flow through the benthic ecosystem of the mangrove with special reference to nematodes. Mahasagar, Bulletin of the National Institute of Oceanography 16: 317-325.
 
Allen, M.W., Noffsinger, E.M., 1971. Nothacrobeles gen. n., with description of four new species (Nematoda: Cephalobidae). Journal of Nematology 3, 145-153.
 
Andrassy, I., 1984. Klasse Nematoda (Ordungen Monhysterida, Desmoscolecida, Araeolaimida, Chromadorida, Rhabditida). Gustav Fischer Verlag. Stuttgart, 509.
 
Andrassy, I., 2007. Free-living nematodes of Hungary, (NematodaErrantia). Pedozoologica Hungarica 2nd eds. IstvanMataskasi, Budapest, Hungary.
 
Cobb, N A., 1924. Amended characterization of the nemic genera Cephalobus and Acrobeles. Journal of Parasitology 11, 108.
 
De Maeseneer, J., de Herde, J., 1963.Methodesutilisees pour l’etude des anguilluleslibresdu sol. Revue d’Agriculture 16, 441-447.
 
Flegg, J.J.M., 1967. Extraction of Xiphinema and Longidorus species from soil by a modification of Cobb’s decanting and sieving technique. Annals of Applied Biology 60, 420– 437.
 
Heyns, J., 1968. Paracrobeles laterellus n. gen., n. sp. from South Africa (Nematoda: Cephalobidae). Nematologica 14, 511-514.
 
Heyns, J., 1994. Chiloplacoides antarcticus n. gen., n. sp. from western Dronning Maud Land, Antarctica (Nematoda :Cephalobidae). Fundamental and applied nematology17, 333-338
 
Holovachov, O., Boström, S., Susulovsky, A., 2001. Description of Acroukrainicus sagittiferus gen. n. sp. n. (Nematoda: Cephalobidae) from the area of an old sulphur industry in Ukraine. Russian Journal of Nematology 9, 51-56.
 
Linstow, O. Von., 1876. Helminthologische Beobachtungen. Archiv Naturgeschichte 42, 1-18.
 
Thorne, G., 1937. A revision of me nematode family Cephalobidae Chitwood and Chitwood, 1934. Proceeding of the helminthological Society Washington 4, 1-16.
 
Timm, R.W., 1971. Antarctic soil and freshwater nematodes from the McMurdo Sound Region. Proceedings of the Helminthological Society of Washington 38, 42-52.
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