ABSTRACT

Tropodiaptomus megahyaline sp. nov. is described and illustrated based on materials collected from a rice field near Songkhram River Basin, Bueng Kan Province, Northeastern Thailand. This new species can be distinguished from its congeners by features of the male such as (1) antepenultimate segment of the right antennule with straight spinous process reaching middle of next segment; (2) basis of the right P5 with three process; (3) basis of both right and left P5 with longitudinal hyaline lamella, length about 1/3 as long as basis on the inner margin; (4) second segment of exopod of the right P5 trapezoidal, with two semicircular hyaline knobs, and one triangular process on distal outer margin of dorsal surface; and (5) inner margin of the exopod of the left P5 with the proximal part larger than the distal part. Differences among Asian Tropodiaptomus species are noted, and an identification key for both females and males of this genus is proposed.

摘要

对虾对虾sp。十一月 基于从泰国东北部Bueng Kan省Songkhram河盆地附近的稻田中收集的材料进行描述和说明。可以通过雄性特征将其与同类动物区分开来，例如：（1）右耳前倒数第二节，棘突笔直到达下一个节段的中间；（2）依据权利P5具有三个过程；（3）左右P5均为纵向透明薄片，长度约为内缘的1/3；（4）右P5梯形的第二个外足节，有两个半圆形的透明旋钮，在背侧表面的远端外缘上有一个三角形的突起；（5）左P5的脚外足的内缘，其近端部分大于远端部分。亚洲之间的差异记述了对虾对虾种类，并提出了该属的雌性和雄性的鉴定钥匙。