﻿COPEPODS FROM LAKE ERH HAI, CHINA — HSIAO 



185 



on the outline of the carapace and abdomen and the rehitive lengths 

 ol' the legs, but no figure was published. In his monograph on North 

 American argulids, with a bibliography of the group and a systematic 

 review of all the known species, Wilson (19Uo) translated Thiele's 

 note but added no further information of the species. In 1904 Tliiele 

 (1904) published the first detailed description of this species, based on 

 both male and female specimens from goldiish in Yokohama, and 

 supplied five figures of its appendages. This should be the basis of 

 specific determination of A. japo7iicus. In 1913 Nakazawa published 

 a description of this species in Japanese. A long while later, Tokioka 

 (1936a) gave a detailed description with two figures (ventral view 

 of a female and of the three posterior legs of the male) of specimens 

 from Japan where they were "commonest . . . found in any season 

 on goldfish and also on Cyprinus carpio (Linne) , Carassius carassius 

 (Linne), and many other freshwater fishes." His account added the 

 following features : (1) Dorsal ridge branched at the anterior end, (2) 

 coxa of the second leg of male with a spine near the base of anterior 

 margin, (3) center of posterior margin of rounded, scaled, area on 

 maxilla (hind maxilla of Thiele) provided with two setae, which were 

 figured in Thiele's drawling (fig. 95) but not mentioned, (4) flagella on 



1/, 



Figure 25. — Argulus japonicus Thiele: a, Female, dorsal view; b, first antenna of female; 

 c, second antenna of female; d, abdomen of male, showing caudal rami; e, maxilliped of 

 female;/, male, ventral view; g, portion of outer edge of carapace, ventral view; h, portion 

 of edge of sucking disk; i, respiratory areas, left side; /, third swimming leg of male, dorsal 

 view showing opening of seminal receptacle; k, fourth swimming leg of male, dorsal view 

 showing spiny lobe projecting from dorsal side of last thoracic segment. 



