Acartia (Odontacartia) ohtsukai, a new brackish-water calanoid copepod from Ariake Bay, Japan, with a redescription of the closely related A-Pacifica from the Seto Inland Sea

作者：Ueda H^*; Bucklin AC

来源：Hydrobiologia, 2006, 560: 77-91.

DOI：10.1007/s10750-005-9513-0

• Acartia pacifca
• Copepoda
• taxonomy
• mtDNA sequence
• continental relict
• Ariake Bay

Acartia ohtsukai sp. nov. (Calanoida, Acartiidae), which has so far been identified as A. pacifica, is described from an estuary of Ariake Bay, Japan, with a redescription of A. pacifica s. str. from the Seto Inland Sea. The new species is distinguishable from A. pacifica by characters of the caudal rami and the antennule in female and those of the urosomal somites and the fifth leg in male. The most closely affinity of A. ohtsukai is seen with A. mertoni new rank, which was formerly a variety of A. pacifica and differs from A. ohtsukai by having dorsal spinule ornamentation on male urosome. DNA sequences of two mitochondrial genes differed between individuals of the new species from Ariake Bay and A. pacifica from the Seto Inland Sea and supported their designation as distinct species: 23-24% for cytochrome oxidase I (mtCOI) and 28% for 16S rRNA. The population in Ariake Bay is regarded as a continental relict, of which the main population is distributed in brackish waters along the coast of the East Asian continent.

• 出版日期2006-5