Redescription of two Pennellids (Copepoda, Siphonostomatoida) from Korea with a key to species of Peniculus von Nordmann, 1832

Abstract

Redescriptions of two pennellid copepods, Peniculus minuticaudae Shiino, 1956 and P. truncatus Shiino, 1956, are provided, based on postmetamorphic adult females collected from marine ranched fishes captured at Tongyeong marine living resources research & conservation center, Korea. Peniculus minuticaudae was collected from the soft fin rays of black scraper Thamnaconus modestus. It can be distinguished from the other two closely related congeners P. ostraciontis Yamaguti, 1939 and P. truncatus bya well developed triangular-shaped abdomen; the abdomen is rudimentary in other two species. This is the first report of the occurrence of P. minuticaudae in Korea. Peniculus truncatus was collected from the dorsal fin of Korean rockfish Sebastes schlegelii. It can be distinguished from P. minuticaudae by the combination of a rudimentary abdomen, long neck and setae on leg 1 and from P. ostraciontis by the long neck, slender trunk, and setae on leg 1. It is also shown that P. truncatus captured from the same host in Korea was misidentified as P. ostraciontis and hence, this is the second record of the occurrence of P. truncatus in Korea. A key is provided for the 14 nominal species of Peniculus.