The similis-Subgroup within Triconia (Copepoda: Cyclopoida: Oncaeidae) from Korean Waters (East China Sea), Including a New Species

Abstract

Jin-Hee Wi, Kyoung-Soon Shin, and Ho-Young Soh (2011) The similis-subgroup within Triconia (Copepoda: Cyclopoida: Oncaeidae) from Korean waters (East China Sea), including a new species. Zoological Studies 50(5): 588-604. Two small oncaeid copepods were collected in June 2009 using a conical net of a fine mesh size (100 mu m) from off the southern coast of Cheju I., Korea (Northwest Pacific) which is affected by the Tsushima Warm Current. One species is newly recorded from Korean waters, and the other is new to science. The new species, Triconia denticula sp. nov., differs from already described similis-subgroup species by a "bulging" lateral margin at the midlevel of the female genital double-somite covered by minute scales on the middorsal and lateral surfaces; the anal somite of the species is ornamented with small scales on the dorsal and ventral surfaces; and the exopodal outer seta of P5 is very long and plumose, which is longer than those of other species of the similis-subgroup. Males of this species were not found so far. Triconia umerus (Bottger-Schnack and Boxshall) which is newly recorded from Korean waters is redescribed with a comparison of its morphological details and differences from published studies. In addition, the zoogeography of the similis-subgroup described from the Northwest Pacific is summarized. http://zoolstud.sinica.edu.tw/Journals/50.5/588.pdf