日本绒螯蟹与不同水系中华绒螯蟹的形态比较

The morphological comparison between Eriocheir japonica and Eriocheir sinenesis in different water systems

对日本绒螯蟹 (Eriocheirjaponica)与辽河、长江、瓯江、闽江、南流江水系中中华绒螯蟹 (E .sinensis)的形态特征进行了比较研究。与中华绒螯蟹相比 ,日本绒螯蟹的特征是头胸甲亚方形或圆形 ;额齿形态圆钝或尖锐 ;侧齿 4个但其中第 4侧齿仅具痕迹或侧齿 4个 ,明显 ;第一龙骨脊颗粒状突起不明显或明显 ;头胸甲背部疣状突 4个或 6个 ;体青绿色具网状细纹或墨绿色、古铜色 ;第五对步足跗节宽呈桨状 ,宽为长的 0 .5倍或宽扁不呈桨状 ,宽仅为长的 0 .4 - 0 .5倍 ;趾节桨状 ,宽为长的 0 .2 3倍或趾节爪状 ,短爪状 ,基部为长的 0 .18- 0 .2倍等。不同水系的中华绒螯蟹 ,在形态上虽然存在一定的差异 ,但其差异不大 。

The morphological comparison researches on Eriochair japonica and E.sinensis in different water systems of the Liaohe,Yantze,Oujiand,Minjiang and Nanliujiang River were reported.The major morphological difference of the mitten crabs(E.japonica and E.sinensis) are subsquare or second circular in carapace;obtuse or sharp in frontal teeth;lateral teeth also clear except the 4th tooth is a trace or the 4th lateral tooth also clear;the fisrst keel smooth or existing granular;knob 4or 6 in carapace;body colour olive or dark green,dark copper;tarsus of the 5th pereiopod flat and shaped oar,bneadth under 2 in length or slight flat but not as sharped oar,breadth 2-2.5 in length;toe sogment of shaped oar,breadth 4.3 in length or toe segment shaped claw,short daw,breadth 5-5.6 in length in the base. There are no significant differences in morphology,of the mitten crabs in different water systems,therefore they belong to different populations.