Descriptions of three new record species of free-living nema-todes(Enoplida Filipjev,1929)from the Jiaodong Peninsula of the Yellow Sea intertidal zone
In order to find out the species composition and species diversity of free living marine nematodes in Jiaodong Peninsula,author investigates the classification and diversity of free-living marine nematodes in the inter-tidal zone of the Yellow Sea's Jiaodong Peninsula.Three new record species of free-living nematodes were identi-fied and described:Oxystomina affinis Gerlach,1956;Trefusia longicorpa Keppner,1986;and Viscosia heterolaima Smol & Sharma,1984.Oxystomina affinis Gerlach,1956 has a slender body and a small buccal cavity.Its outer lip and head setae are 2-μm long,and it has an oval amphid and curved spicules with tapered ends.It lacks a guber-naculum and has two unequal anterior anal setae.Its tail is conically columnar and expands into a rod shape at the end.Trefusia longicorpa Keppner,1986 also has a slender body and small mouth but lacks teeth.It has three labial lips and six inner labial setae that are divided into three segments,whereas the head setae are divided into two segments.The amphid is bag-shaped,with 11 uniformly distributed papillary auxiliaries arranged in a row on the ventral side of the neck and 11 papillary anterior anal auxiliaries on the ventral side.Viscosia heterolaima Smol &Sharma,1984 has a slender body,inner lip papillae,and 2-μm long head setae.Its buccal cavity is barrel-shaped with three teeth,with the right subventral tooth being larger than the left subventral and dorsal teeth.It has straight spicules,lacks a gubernaculum,and has short setae around the cloacal pore.The tail is conically columnar,with the distal end extending into a longer columnar part.This research contributes to the understanding of nematode species diversity in the Yellow Sea.
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