Trinchesia ornata ( Baba, 1937 )

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

3. Trinchesia ornata ( Baba, 1937) ( Fig. 1C )

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Cuthona (Hervia) ornata Baba, 1937: 331-333 , pl. 2, fig. 4, text-fig. 17.

Cuthona ornata : Baba, 1961: 367; Okutani, 2000: 805, pl. 400, fig. 3.

Trinchesia ornata : Debelius and Kuiter, 2007: 351; Chichvarkhin, 2016: 27, 28, fig. 9J; Kil et al., 2020: 126, 127.

Material examined. 3 individuals (MO00178664, MMR BK7444, MMRBK7445 ): Donji-ri , Saryang-myeon, Tongyeong-si, Gyeongsangnam-do, Korea, 34°50′10.97″ N, 128°09′28.64″E, 07 April 2021 ; 1 individual ( NIBRIV 0000882623 ): Gisamun-ri , Hyeonbuk-myeon , Yangyanggun, Gangwon-do, Korea, 38°01′19.87″N, 128°44′22.46″ E, 27 May 2020 .

Diagnosis. Body elongate (length 9 mm, width 2 mm), dorso-ventrally flattened. Background body color opaque yellow. Oral tentacles and rhinophores smooth, tapering with an ivory white tip. Dorsal cerata finger-shaped, relatively long, slender, with ivory white or yellow terminal tip. Cerata arranged in nine transverse rows. Digestive gland blue to purple in color. Foot narrow. Metapodium elongate, with a sharply pointed end.

GenBank accession number. OK143200.

Distribution. Korea, Australia, Hong Kong, Indo Pacific, Japan, Philippines, Russia (Primorsky).

Remarks. This species is found in the northwestern Pacific and Indo-Pacific, including Australia, and the Peter the Great Bay, Russia (Primorsky). The specimens examined in this study show blue-colored digestive glands, giving their cerata a blue look with a yellow terminal tip (or ivory white tip in some individuals), the most distinctive coloration of this species.

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.