Pacifia amica, Korshunova, Tatiana, Martynov, Alexander, Bakken, Torkild, Evertsen, Jussi, Fletcher, Karin, Mudianta, I Wayan, Saito, Hiroshi, Lundin, Kennet, Michael Schroedl, & Picton, Bernard, 2017

Korshunova, Tatiana, Martynov, Alexander, Bakken, Torkild, Evertsen, Jussi, Fletcher, Karin, Mudianta, I Wayan, Saito, Hiroshi, Lundin, Kennet, Michael Schroedl, & Picton, Bernard, 2017, Polyphyly of the traditional family Flabellinidae affects a major group of Nudibranchia: aeolidacean taxonomic reassessment with descriptions of several new families, genera, and species (Mollusca, Gastropoda), ZooKeys 717, pp. 1-139 : 51-53

Pacifia amica sp. n. Figs 41, 45

Type material.

Holotype, ZMMU Op-614, 6.5 mm long (live), NE Pacific, Sullivan Point, Rich Passage, 25.01.2017, depth 15.2 m, stones, collector Karin Fletcher. 1 paratype, ZMMU Op-615, same locality and collector as holotype.

Type locality.

NE Pacific, Rich Passage.

Etymology.

See under the genus description above.

Diagnosis.

Four to five ceratal clusters, colour translucent white with opaque white mid-dorsal line, cerata orange red to light pink, rachidian tooth with up to six denticles, central cusp bears small denticles, distinct distal receptaculum seminis, no accessory penial gland, penis unarmed.

Description.

External morphology (Fig. 41 A–B). Body elongate, 6.5 mm in length (live). Rhinophores similar in size to oral tentacles, smooth. Dorsal cerata finger-shaped to fusiform, forming four to five ceratal clusters along dorsal edges. Apices of cerata gradually pointed, with elongate cnidosac. Notal edge discontinuous. Digestive gland diverticulum fills significant volume of the cerata. Anal opening pleuroproctic towards acleioproctic position on right side below second large ceratal clusters. Reproductive openings lateral, below first anterior cluster of cerata.

Colour (Fig. 41 A–B). General colour translucent white. Oral tentacles with opaque white lines, which meet on middle of head and continue through middle part of body to the tail. Digestive gland in the cerata orange-red to light pink; scattered small spots on cerata, ceratal tip transparent (Fig. 41C).

Jaws (Fig. 41 D–E). Jaws broadly-triangular, masticatory borders with weak tubercles.

Radula (Fig. 41 F–H) Radula formula 28 × 0.1.0. Rachidian tooth with up to six distinct denticles. Rachidian cusp bears small denticles at the base (Fig. 41H). No lateral teeth.

Reproductive system (Fig. 41I). Diaulic. Ampulla wide, folded twice (Fig. 41I, am). Prostate thick (Fig. 41I, pr). Vas deferens short (Fig. 41I, vd), penial sheath elongate (Fig. 41I, ps), conical penis unarmed. Distal seminal receptaculum long, with distinct stalk and oval reservoir (Fig. 41I, rsd). Proximal receptaculum seminis oval.

Biology.

Subtidal, on stones with hydroids (Fig. 41B).

Distribution.

Presently found only at a Port Orchard locality in Washington State, NE Pacific.

Remarks.

See Remarks under the new genus Pacifia above.