Loxosomella angusta, Borisanova, 2016

Loxosomella angusta sp.n.

Figs. 1 View Fig , 2 View Fig .

Type material: ZMMU Uk-15 (holotype) GoogleMaps ; ZMMU Uk-16 (4 paratypes) GoogleMaps .

Type locality: Kandalaksha Bay, White Sea   GoogleMaps (66°34′N, 33°08′E), depth 18–24 m, 30.07.2015; on the bryozoan Electra sp. living as an epibiont on a shell of Mytilus edulis Linnaeus, 1758 .

Etymology: The species’ name ‘ angusta ’ means ‘narrow’ in Latin and refers to a quite narrow calyx which is almost as wide as the upper part of a stalk

Diagnosis:

Average total length of body from end of foot to base of tentacles 520 µm (up to 575 µm). Calyx narrow, width in lateral view is almost the same as width in frontal view. Calyx bears 8 tentacles. Tentacle crown faces frontally in contracted state and slightly distofrontally in the expanded state. Stomach wide, trilobed. Stalk length of measured specimens from 250 to 380 µm with average length about 330 µm. Stalk width is about 75 µm. Foot and foot gland are absent. Basal part of stalk that serves for attaching to the substratum differs from the rest of stalk. It is thinner than main part of stalk, and it looks empty when a lot of connective-tissue cells and muscle cells are distinguished in the main part of stalk. Length of basal part of stalk makes about 25% of total length of stalk. Biometrical data of the holotype and some other live individuals are given in Table 1 View Table 1 .

Reproduction: Buds emerge from laterofrontal areas at middle level of stomach. Up to two buds (one bud on each side) at a time were observed (holotype has only one young bud). Embryos were not observed.