Kalmar "Genus" tana nufin nau'in harajin haraji wanda ake amfani da shi a cikin rarrabuwar halittu don haɗa nau'ikan nau'ikan da ke da alaƙa. nau'in, kunkuru na teku na leatherback (Dermochelys coriacea). Kunkurun tekun ledar ita ce mafi girma a cikin duk kunkuru masu rai, kuma an yi masa suna saboda fata, mai sassauƙa da harsashi wanda ba ya da wuya, faranti na ƙasusuwa da ake samu a cikin wasu kunkuru.