Vol. 46 No. 4, 2007

Two New Marine Gastrotrichs of the Genus Tetranchyroderma (Macrodasyida: Thaumastodermatidae) from South Korea

Ji Min Lee¹ and Cheon Young Chang^2,*

¹Institute of Basic Science, Daegu University, Gyeongsan 712-714, Korea
²Department of Biology, College of Natural Sciences, Daegu University, Gyeongsan 712-714, Korea

Ji Min Lee and Cheon Young Chang (2007) Two new marine thaumastodermatid species, Tetranchyroderma multicirratum sp. nov. and T. monokerosum sp. nov. are described on the basis of specimens collected from sublittoral sandy bottoms of the Yellow Sea and Jeju I., Korea.  Both species have cuticular armature with pentancres only.  Tetranchyroderma multicirratum sp. nov. is clearly differentiated from its congeners by the character combination of head with papillary protrusions, 3 kinds of cephalic tentacles, and 10 pairs of long subdorsal and dorsolateral cirrata.  Tetranchyroderma monokerosum sp. nov. is characterized by 1 mid-dorsal rod-like cephalic tentacle, a pair of pestle organs, and 2 pairs of dorsolateral adhesive tubes.

Key words: Taxonomy, Gastrotricha, Thaumastodermatidae, Tetranchyroderma, Korea.

*Correspondence: Tel: 82-53-8506454.  Fax: 82-53-8506459. E-mail:cychang@daegu.ac.kr