octopodids

八足类动物

章鱼科动物的总称，章鱼类
其分类地位如下：

软体动物门（Mollusca），头足纲（Cephalopoda），八腕目（Octopoda），章鱼科（Octopodidae）

可以参考：Taxonomic accounts of octopodids（章鱼类动物的分类依据） frequently describe the spermatophore, the penis that releases the spermatophore from the internal organs, and the ligula and calamus that transfer it to a female. To explore relationships among these male features and body size, this study applies principal components analysis to data from 43 species of the family（科） Octopodidae（章鱼） , or benthic octopuses（深海章鱼）. Covariation in penis and mantle length opposed by covariation in ligula and calamus lengths forms primary shape variation. Secondary shape variation is due to opposing variation between ligula and calamus lengths. Primary shape variation is greatest among shallow-water species. The calami and ligulae of diurnal and crepuscular shallow-water species are short compared to those of nocturnal shallow-water species. Because these structures contain