Onchimira cavifera

• Main Authors: Martynov, Alexander, Korshunova, Tatiana, Sanamyan, Nadezhda, Sanamyan, Karen
• Format: Other/Unknown Material
• Language: unknown
• Published: 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Nudibranchia; Onchidorididae; Onchimira; Onchimira cavifera; Pacific; Kamchatka Peninsula; Kamchatka
• Online Access: https://zenodo.org/record/5694796; https://doi.org/10.5281/zenodo.5694796

Onchimira cavifera gen. et sp. nov. (Figures 2; 3 A, E; 4 A–C, F, J–K; 5 A, B; 6 A, B; 7 A. Table 1) Type material. Holotype, ZMMU Lc- 37446, NW Pacific near Kamchatka peninsula, Starichkov Id., 20–26 m, large boulders, collected by T.A. Korshunova and A.V. Martynov. 14.08. 2008. Paratypes, ZMMU Lc- 37447, 11 specimens (three dissected), same locality and collectors as holotype, 14.08. 2008. Paratypes, ZMMU Lc- 37448, three specimens (one dissected), same locality and collectors as holotype, 18–24 m, 19.08. 2008. Paratypes, ZMMU Lc- 37449, three specimens (one dissected), same locality and collectors as holotype, 19.08. 2008. Paratypes, ZMMU Lc- 37450, three specimens (one dissected), same locality and collectors as holotype, 19.08. 2008. Type locality. NW Pacific, SE Kamchatka, Starichkov Id., 18–26 m depth. Etymology. The species epithet from the Latin cavi (= cavity) and fero (= to bear) refers to the presence of a well-defined gill cavity. Description. External morphology. The dimensions of the holotype are 22 mm x 12 mm (Fig. 2). The length of fifteen measured living specimens ranged from 8.5 to 25 mm, the width ranged from 4.5 to 14 mm. The consistency of the living animals is soft. The notum is rather broad, rounded in front and posteriorly. The rhinophores are long and retracted into raised sheaths with smooth, soft, sometimes slightly crenulate edges, not bearing tubercles (Fig. 2 C). The rhinophoral sheath edges are capable of considerable contraction in living specimens. There are 5–9 rhinophoral lamellae. The rhinophore clavus lacks a posterior ridge. The notum is almost smooth, sparsely covered with wrinkled low elevations, sometimes raised to very low tubercles (Fig. 2 A). Rays of spicules radiate from the bases of such elevations and form a sparse network in the notum (Fig. 6 A), but spicules are not conspicuous externally (Fig. 2 A). Each elevation contains sparsely placed spicules, which do not protrude from the tubercles. The strongly calcified spicules are of various size, most with a narrow ...