カツオに寄生する橈脚類Caligus katuwo Yamagutiの雄について

概要

論文の詳細を見る
The male of Caligus katuwo Yamaguti, which has not been recorded up to the present, may be defined as follows: Body a little shorter than in female, 4.32mm×1.86mm. Median lobe of carapace truncate on posterior margin. Fourth thoracic segment triangular on either side. Genital segment 5/9 as long as carapace, 2/3 as wide as its own length, barrel-shaped, with lateral margins widely round, but constricted close to anterior extremity. Abdomen columnar, 5/6 as long and half as wide as preceding segment, 2-segmented. Terminal claw of posterior antennae small, unguiform, ending in a sharp apex. First pair of maxillae very long, curyed at a right angle near the end, 2nd pair with a small, triangularr accessory branch. Second maxillipeds bearing a minute, acuminate process on inner margin. Genital segment has 2 groups of short simple spines, each composed of 2, in its posterior half on each side. Otherwise as in female.
社団法人日本動物学会の論文
1954-06-15