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The descriptions of seven new and supplemental descriptions of four known species of the genus Acantholaimus (Nematoda: Chromadoridae) from about 5,000 m depth in the abyssal manganese nodule field of the French Claim of the Clarion–Clipperton Fracture Zone (north-eastern tropical Pacific) are given. A. arthrochaeta sp. n. differs from other Acantholaimus species in having jointed cephalic setae. A. barbatus sp. n. is characterized by long cephalic setae and the presence of numerous somatic setae at the level of the pharynx. A. cornutus sp. n. possesses strong onchia and rugae and short cephalic setae. A. robustus sp. n. is characterized by a very large body size, two very large onchia, strongly developed rugae, and cervical setae grouped in threes. A. sieglerae sp. n. is a comparatively small species, though with very large onchia. A. tchesunovi sp. n. can be differentiated from the other species by the lateral differentiation of the body cuticle, consisting of 6–7 longitudinal rows of pores. A. veitkoehlerae sp. n. has a narrow elongate anterior end, two cervical setae, and strong onchia. A. angustus and A. occultus were found about 5,200 km from their type localities in the Peru Basin, south-east Pacific. A. iubilus and A. maks were previously found in different parts of the Atlantic and in the Peru Basin.

helgoland marine research

Seven new and four known species of the genus Acantholaimus (Nematoda: Chromadoridae) from the abyssal manganese nodule field (Clarion-Clipperton Fracture Zone, North-Eastern Tropical Pacific)