毛蟹(xie)與(yu)正常(chang)動(dong)物(wu)一(yi)(yi)樣也分公(gong)(gong)母,一(yi)(yi)種簡(jian)單區(qu)分蟹(xie)類區(qu)分公(gong)(gong)母的小訣(jue)竅(qiao),以毛蟹(xie)為例,觀察毛蟹(xie)的尾部,有一(yi)(yi)片白(bai)色蟹(xie)殼從尾部一(yi)(yi)直延伸至肚中,通常(chang)我(wo)們把這塊(kuai)白(bai)色蟹(xie)殼稱為蟹(xie)兜,蟹(xie)兜有兩種形(xing)狀(zhuang),一(yi)(yi)種三角形(xing),一(yi)(yi)種半(ban)圓形(xing),蟹(xie)兜為三角形(xing)就是(shi)(shi)公(gong)(gong)蟹(xie),為半(ban)圓形(xing)就是(shi)(shi)母蟹(xie)。