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Freeliving marine nematodes from the Indian Ocean

Warwick, R.M. (1973) Freeliving marine nematodes from the Indian Ocean. Bulletin of the British Museum. Natural History (Zoology), 25 . pp. 85-117.

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Thirteen species of freeliving marine nematodes collected by the Royal Society's 1963 expedition to the South-east Arabian upwelling region of the Indian Ocean are described. Twelve of these species are new, all being referable to existing genera. Didelta cobbi sp . nov. is closest to D. maculatum Cobb, 1920 and is distinguished from this species by the form of the amphids, and possibly the arrangement of cephalic setae. Procamacolaimus papillosus sp. nov. is similar to P. dolichostylum Gerlach , 1953, but has shorter cephalic setae, no subventral buccal teeth and a differently shaped gubernaculum. Sphaerolaimus crenellatus sp . nov . is characterized by the posterior position of its amphids, a buttressed cephalic capsule and double-jointed spicules. Siphonolaimus profundus sp . nov. is apparently similar to S . gladiator Wieser, 1956, but differs from it in the setal arrangement on the head, the longer buccal spear and the presence of pre-cloacal supplements in the male. Desmodora masira sp . nov . is characterized by a short broad perforate cephalic capsule, small amphids, a weakly armed buccal cavity, a long tail and no male supplements. Sabatieria alata sp. nov. is very close to S . furcillata Wieser , 1954, but has a larger overall size, sh orter cephalic setae, smaller amphids and a different spicule structure. Hopperia muscatensis sp . nov. is distinct from the type and only other species H. massiliensis Vit iello, 1969, in having longer cephalic setae, a shorter tail and differently shaped spicules. Platycomopsis implicatus sp . nov. is separated from its nearest relative P. dimorphica Mawson, 1956, in the setal arrangement on the head , the smaller amphids, the structure of the spicules and the position of the pre-cloacal supplement. Synonchus alisonae sp . nov. is characterized by the very long filiform tail and relatively long cephalic setae. Specimens of Dayellus dayi Inglis, 1964, conform exactly with the type, but are slightly smaller in many of the measurements. Crenopharynx fringilla sp . nov . is characterized by the combination of a long flagellate tail, spicules with no barbs or other modifications and a gubernaculum with pointed lateral pieces. Mesacanthion southerni sp. nov. is very closely related to M. diplechma Southern, 1914, but comparison with specimens of this latter species from the North Sea reveal differences of specific rank mainly concerning the copulatory apparatus of the male. Mesacanthion arabium sp . nov. is very charact eristic : it has long spicules, a paired L-shaped gubernaculum with raised ridges at the distal end and unique accessory organs associated with the vulva in the female.

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