Panagrellus ceylonensis n. sp. (Nematoda: Cephalobidae)

Panagrellus ceylonensis n. sp. is described from rubber latex in Ceylon. Its long, slender spicules are curved ventrally with a dorsal deflection at two-thirds of their length. The manubrium is thick and hooked, and the shaft is not widened at the shoulder. The terminal bifurcations are wide, with the dorsal one considerably longer and thicker than the ventral. The main ventral element is continuous with the terminal sheath with the ventral bifurcation arising within it.     

Mylonchulus sessus n.sp. (Nematoda: Mononchida) from Brunei

Summary Mylonchulus sessus n.sp. is described. It is close to M. sigmaturus and M. dentatus and was found in soil from around tomato from Brunei. It has an exceptionally well developed and differentiated female reproductive system which is rather unusual in Mylonchulus and, although close to M. sigmaturus and M. dentatus differs from both in having wider amphids and smaller submedian teeth.     

Trichodorus persicus n. sp. (Nematoda: Trichodoridae) from Iran

Trichodorus persicus n. sp. is described from the Caspian region of Iran, where it was found in woodland and orchard soil. Males of the new species usually have two ventral cervical papillae anterior to the excretory pore but posterior to the base of the onchiostyle; there are three ventromedian preanal supplements, the posterior one lying near the heads of the retracted spicules; the spicules are 51–61 m long with faint transverse striations distally. Females have two pairs of lateral body pores, large rounded sclerotized thickenings at the vulva and the vagina tapers inwards in lateral view.     

Xiphinema bacaniboia n.sp. (Nematoda: Dorylaimida) from Fiji

Summary Xiphinema bacaniboia n.sp. is described from rain forest in Fiji. Adult females are characterized by their spiral shape on heat death, slightly offset lip region, total stylet length of 270–292 m, post-median vulva, paired, opposed genital branches with greater development of the anterior one, absence of a Z organ and the presence of a broadly rounded tail, flattened ventrally with no blind canal. The species is differentiated from X. ingens Luc & Dalmasso, 1964, X. macrostylum Esser, 1966 and X. riocaquetae Hunt, 1982. ac]19830610     

Coslenchus capsici n. sp. (Nematoda: Tylenchidae) from India

Coslenchus capsici n. sp., from around the roots of Capsicum annuum at Kulu (H.P.), India, is characterized by a large number of cuticular ridges (17+17 + lateral fields), a smooth head with a well-sclerotized framework and a forwardly inclined vagina with swollen walls.     

Criconemella anastomoides n. sp. (Nematoda: Criconematina) from Pakistan

Criconemella anastomoides, described and illustrated herein, is characterized by the presence of regular anastomosis on the body, two zig zag lateral lines, stylet knobs sloping posteriorly, short stylet, and short body length.     

Description of Pratylenchoides sheri n. sp. (Nematoda: Pratylenchidae)

Pratylenchoides sheri n. sp., a bisexual species from the Pacific coastal area of California, is described and illustrated. Its most distinctive characters are the esophageal glands slightly overlapping the intestine dorsally, the large ventrally slanting esophago-intestinal valve, the lack of labial sectors in the first lip annule, the presence of males, and apparently functional spermatheca. Pratylenchoides sheri is morphologically similar to P. magnicauda, but differs in length and labial conformation, its more anterior vulva, and the presence of males. Relationships of head and esophagus gland lobe characters of P. sheri are compared to other Pratylenchoides species.     

Description of Thecavermiculatus carolynae n. sp. (Nematoda: Ataloderinae)

Thecavermiculatus carolynae n. sp. from the Pacific coastal area of California is described from female, male, and juvenile (J2) specimens reared on Festuca megalura Nutt. in the greenhouse. Differences between females of T. carolynae and those of its closest relative, T. gracililancea Robbins, 1978, include shorter stylet, shorter length, and lesser length of the vulval slit. Of these two species, males have been found only for T. carolynae. The habitats of the two species are vastly different: T. gracililancea has been found only in shallow clay soil near hilltops in an area subject to high summer temperatures where the soil becomes brick-like during the summer; T. carolynae has been found only in deep sandy soil of a creek bottom subject to cool summer temperatures where the soil remains moist.     

Description of Pararotylenchus belli n.sp. (Nematoda:Hoplolaimidae)

A new species of Pararotylenchus Baldwin &Bell, 1981 from the Pacific coastal area of California is described. Numerous females and juveniles were recovered, but no males were found. Pararotylenchus belli n.sp. is most similar to P. sphaerocephalus, but females of P. belli are shorter and have a shorter stylet and a hemispherical tail. Specimens from a cereal field in South Dakota were identified as P. colocaudatus.     

Helicotylenchus stylocercus n. sp. and Rotylenchus phaliurus n. sp. (Nematoda: Hoplolaimidae) from Costa Rica

Two new species of plant-parasitic nematodes from Costa Rica are described. Helicotygenchus styloeercus n. sp., from soil around roots of banana at Coto, is distinguished hy the female tail, which bears a large pillarlike ventral projection. Rotylenchus phaliurus n. sp., from soil artmnd roots of Dioscoroea sp. at Sixaola, differs from R. caudaphasmidius in having the conus equal to or more than half the spear length, and large terminal annules on the female tail.     

Halalaimus algeriensis n. sp. (Nematoda) from the Sahara

During a trans-Saharan expedition in 1980 a number of samples were collected from stagnant and running fresh and slightly saline water bodies. One of them, collected from the Oued En-Namous in a small oasis yielded several interesting nematodes, among which was a newHalalaimus species described herein asHalalaimus algeriensis n. sp. It comes close toH. minusculus Tchesunov, 1978, but differs in tailshape, absence of males and habitat. It also resembles the marine speciesH. gracilis de Man, 1888, but differs in the relative length of the anterior setae, the absence of a lateral field and absence of males. The new species can be differentiated fromH. stammeri Schneider, 1940, the only fresh water species found hitherto, by its shorter body, more anterior and wider fovea, and the length and position of the anterior setae. The various juvenile stages can be separated on the basis of body length, foveal length and genital primordium.     

Mermis savaiiensis n. sp. (Nematoda: Mermithidae) from Western Samoa

Summary Mermis savaiiensis n. sp., found in soil samples from Western Samoa is described and figured. It is characterized by an apical oral depression, smooth-shelled eggs lacking byssi but with low, cap-like polar elevations and a conoid tail with a rounded terminal projection. M. maroccana Baylis, 1935 is considered species inquirenda.     

Gongylonema aegypti n. sp. (Nematoda: Thelaziidae) from Egyptian rodents

Summary A new species of spiruroid nematode,Gongylonema aegypti, is described from two rodents,Mus musculus andGerbillus gerbillus, from Egypt.G. aegypti is distinguished from closely related species by the size of the spicules and gubernaculum, the absence of cuticular bosses in males, and the size of the egg. SEM studies suggest that the generic diagnosis ofGongylonema should be amended to include the presence of a dorsal pore on the cephalic plate and the presence around the buccal cavity of three triangular teeth (not lips) and two sclerotized plates or interlabia. ac]19850414