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 Peniculus 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 Peniculus ostraciontis Yamaguti, 1939 and Peniculus truncatus by having a well developed triangular-shaped abdomen; the abdomen is rudimentary in other two species. This is thefirst report of the occurrence of Peniculus minuticaudae in Korea. Peniculus truncatus was collected from the dorsal fin of Korean rockfish Sebastes schlegelii. It can be distinguished from Peniculus minuticaudae by the combination of a rudimentary abdomen, long neck and setae on leg 1 and from Peniculus ostraciontis by the long neck, slender trunk, and setae on leg 1. It is also shown that Peniculus truncatus captured from the same host in Korea was misidentified as Peniculus ostraciontis and hence, this is thesecond record of the occurrence of Peniculus truncatus in Korea. A key is provided for the 14 nominal species of Peniculus.

Complete life cycle of a pennellidPeniculus minuticaudaeShiino, 1956 (Copepoda: Siphonostomatoida) infecting cultured threadsail filefish,Stephanolepis cirrhifer

“…All stages were described except the adult male and post-metamorphic adult female since both are already well described [24, 27, 30]. Prior to making observations, specimens were cleared in a drop of lactophenol for 30 min, dissected and examined following the wooden slide procedure [13].…”

“…The genus Peniculus von Nordmann, 1832 (Copepoda: Siphonostomatoida: Pennellidae) consists of 14 nominal species [3, 30]. In Japan, three Peniculus species have so far been recorded: P. minuticaudae Shiino, 1956, P. ostraciontis Yamaguti, 1939 and P. truncatus Shiino, 1956 [27, 32].…”

“…In Japan, three Peniculus species have so far been recorded: P. minuticaudae Shiino, 1956, P. ostraciontis Yamaguti, 1939 and P. truncatus Shiino, 1956 [27, 32]. Peniculus minuticaudae has so far been recorded from fishes of two different families: four fish hosts of the family Monacanthidae, threadsail filefish Stephanolepis cirrhifer (Temminck and Schlegel, 1850), black scraper Thamnaconus modestus (Günther, 1877), unicorn leatherjacket filefish Aluterus monoceros (Linnaeus, 1758), hairfinned leatherjacket Paramonacanthus japonicus (Tilesius, 1809) and one Chaetodontidae, brown-banded butterflyfish Chaetodon modestus Temminck and Schlegel, 1844 [20, 24, 27, 30]. Peniculus ostraciontis was recorded from two boxfishes, humpback turretfish Tetrosomus gibbosus (Linnaeus, 1758) and the triangular boxfish T. concatenatus (Bloch, 1785) (Ostraciidae) [32, 28], while P. truncatus was found to infect rockfish Sebastes oblongus Günther, 1877 [27] and Korean rockfish S. schlegelii Hilgendorf, 1880 (Sebastidae) [30].…”

“…The post-metamorphic female of P. minuticaudae has recently been redescribed from Japanese [24] and Korean [30] waters. Recent reports indicated the severity of infestation by P. minuticaudae on fishes kept in captivity such as in aquaculture facilities [10, 20, 30] and in a commercial aquarium [24]. …”

Monogeneans (Platyhelminthes) from marine fishes of Tongyeong, Korea

“…Considering its ongoing and future potential importance, we thoroughly checked the presence of metazoan parasites on seabream (Venmathi Maran et al 2012a), black scraper and rockfish (Venmathi Maran et al 2012b) at Tongyeong marine living resources research and conservation center (TMRC), Korea. At TMRC, several commercially important fishes are ranched under the marine ranching program by the Korea Institute of Ocean Science and Technology (KIOST) from 1998 (MOMAF 2007).…”