Onchidoris expectata Martynov & Korshunova 2017, sp. nov.

• Main Authors: Martynov, Alexander, Korshunova, Tatiana
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Nudibranchia; Onchidorididae; Onchidoris; Onchidoris expectata; Kamchatka; Kamchatka Peninsula
• Online Access: https://doi.org/10.5281/zenodo.6010361

Onchidoris expectata sp. nov. (Figures 4; 5C) http://zoobank.org/urn:lsid:zoobank.org:act:5305B972-7C4D-4903-AE5C-9CA75D30903F Type Material. Holotype, ZMMU Op-593 (5 mm length), Kurile Islands, Matua Island, Cape Klyuv, 15 m depth, leg. N.P. Sanamyan, 26.08.2016. Paratypes, ZMMU Op-594 (6 mm length), 1 specimen, Kurile Islands, Matua Island, 15 m depth, leg. N.P. Sanamyan, 26.08.2016. ZMMU Op-595 (7 mm length), 1 specimen, NW Pacific near Kamchatka peninsula, Avachinskaya bay, 10 m depth, leg. N.P. Sanamyan, 16.09.2011. Type locality. Matua Island, Middle Kurile Islands, NW Pacific. Etymology. From the Latin expectatus which means both “expected” and “hoped for,” due to the expectation of the finding of new onchidoridid species in NW Pacific. The Russian word for “hope” is nadezhda which coincides with the first name of the collector of this species, Nadezhda Sanamyan. Description. External morphology. The length of holotype is 5 mm, the width is 2.5 mm (Fig. 4 A, B). The lengths of two preserved paratypes are 6 and 7 mm, the widths 3 and 6.5 mm. The consistency of the living animals is hard. The notum is moderately broad, rounded in front and posteriorly. The rhinophores are long and retractable into sheaths with smooth edges, except for several tubercles of various sizes that are connected to the edges of the sheaths. The rhinophoral sheath margins are capable of some contraction in living specimens. There are 12–15 rhinophoral lamellae. The notum is densely covered with large club-shaped tubercles (Fig. 4 A). The larger tubercles dominate the notum, with some smaller tubercles scattered among large ones. The spicule rays that extend from the bases of tubercles form a dense network that shines through the notum surface. Each tubercle contains dense bundles of spicules, sometimes slightly protruding from the tubercle surface. The strongly calcified spicules are of various sizes. A gill cavity is absent. Inside the gill circlet are several narrow tubercles of differing heights. Seven to eleven uni- to bipinnate ...