Antiopella fusca (O’Donoghue, 1924)

Lee, Yucheol, Nam, Eunjung & Park, Hyun-Jong Kil and Joong-Ki, 2022, Morphological description and DNA barcode information of seven newly reported nudibranch species from Korea, Journal of Species Research 11 (2), pp. 102-107 : 105

4. Antiopella fusca (O’Donoghue, 1924) ( Figs. 1D )

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Janolus fuscus O’Donoghue, 1924 ; Chichvarkhin et al., 2016: 24, figs. 2, 3.

Antiopella fusca : Pola et al., 2018: 363, 364, fig. 10; Kil et al., 2020: 130, 131.

Material examined. 1 individual (MO00178871): Munamjin-ri , Jugwang-myeon , Goseong-gun, Gangwon-do, Korea, 38°18′04.04″N, 128°34′10.08″E, 05 May 2021 ; 1 individual ( NIBRIV0000811823 ): Gangmun-dong , Gangneung-si, Gangwon-do, Korea, 38°49′22.35″N, 128°57′ 46.55″E, 27 April 2017 .

Diagnosis. Body elongate, ovate (length 30 mm, width 16 mm), ground color translucent white to light yellow. Rhinophoral clubs lamellate, stalks smooth. Oral tentacles short, triangular in shape. Dorsal cerata fusiform, with an orange or yellow band and a white pointed tip. Digestive gland in cerata straight, brown to black in color. Metapodium elongate, pointed posteriorly.

GenBank accession number. OK143206.

Distribution. Korea, North America (Alaska to central California), Japan, Russia.

Remarks. The genus Antiopella includes eight taxonomically valid species ( WoRMS, 2021). This species is similar to A. barbarensis in external morphology, but distinguished by the color pattern of ceratal tip: In A. fusca , the cerata have an orange or yellow band with a white terminal tip, whereas A. barbarensis have cerata with sky blue-colored tips. The Antiopella species are found in inter- and shallow subtidal waters feeding on bryozoans. The occurrence of this species from Korean waters (East Sea) was firstly reported in 2006 ( Koh, 2006), but this study provides detailed information on external morphology, and molecular data of DNA barcode sequences.

Figures

Fig. 1. Images of seven Nudibranchia species in Korea. A, Dendronotus primorjensis Martynov, Sanamyan & Korshunova, 2015; B, Doto japonica Odhner, 1936; C, Trinchesia ornata (Baba, 1937); D, E, Antiopella fusca (O’Donoghue, 1924); F, Cadlina paninae Korshunova, Fletcher, Picton, Lundin, Kashio, N. Sanamyan, K. Sanamyan, Padula, Schrödi & Martynov, 2020; G, Rostanga bifurcata Rudman & Avern, 1989; and H, Goniodoridella savignyi Pruvot-Fol, 1933.