Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

A new species of Oceanobdella (Hirudinida: Piscicolidae) from the plain sculpin, Myoxocephalus jaok, from Bristol Bay, Alaska.

Abstract

This paper describes Oceanobdella khani sp. nov. which was obtained from the plain sculpin, Myoxocephalus jaok, collected during 4-15 June 2003 from Bristol Bay, Alaska, USA, in the eastern Bering Sea. The prevalence was never greater than 10% in any single collection. The maximum intensity was 12 leeches per host, but most fish had 5 or fewer leeches. O. khani possessed generic characteristics such as small oral sucker, 5 pairs of testisacs, unremarkable terminal male reproductive organs, coelomic system lacking pulsatile vesicles, and 3 pairs of eyes on the oral sucker-trachelosome. It was distinguished from other species in the genus by solid black pigmentation on the urosome, clitellum, trachelosome, and most of the oral sucker except for an unpigmented margin. The pigmentation of the caudal sucker was highly variable, ranging from overall mottled blackish gray to completely unpigmented. The caudal sucker lacked ocelli. Intestinal caeca were large, crop caeca were directed anteriorly, and postcaeca were separate for their entire length.