Sample no IEE 15070003 description: ammocoetes of Lethenteron camtschaticum (TILESIUS, 1811) (PETROMYZONTIDAE, PETROMYZONTIFORMES) from Malaya Khuzi River (Sakhalin)

Paper provides biological description of both males and females of Arctic lamprey, Lethenteron camtschaticum ammocoetes from one of Sakhalin rivers, Malaya Khuzi. It briefly describes stages of development of the larvae gonads and cases of infantilism and transverse.