Leptochiton commandorensis Sirenko, 2017

Sirenko, B. I., 2023, Indonesian chitons of the genera Belknapchiton Sirenko, Saito et Schwabe, 2022 and Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Leptochitonidae), Ruthenica, Russian Malacological Journal 33 (2), pp. 79-94 : 85

publication ID

https://doi.org/ 10.35885/ruthenica.2023.33(2).4

DOI

https://doi.org/10.5281/zenodo.11172624

persistent identifier

https://treatment.plazi.org/id/1B1DC90A-E807-065E-3BB5-F8F81306F84D

treatment provided by

Felipe

scientific name

Leptochiton commandorensis Sirenko, 2017
status

 

Leptochiton commandorensis Sirenko, 2017 View in CoL

( Figs 10–15 View FIG View FIG View FIG )

Leptochiton sp.1 . – Sirenko, 2013: 148.

Leptochiton commandorensis Sirenko, 2017: 114 View in CoL , figs 6–8.

Type material. Holotype ( ZISP 2254 )

Type locality. North-western Pacific, near Commander Islands, 54°57.4’– 54°57.8’N, 165°47.8’– 165°52.0’E, 4805– 3724 m, pebbles and mud.

Material examined. Holotype. Indonesia, Banda Sea, R / V Vitjaz, cruise 54, stn. 6778, 5°15’S, 128°25’E, 3200 m, 2 spms, BL 5.0–13.0 mm, 11.04.1973. GoogleMaps

Distribution. Only known from the Commander Islands, 4805– 3724 m and the Banda Sea, 3200 m.

Remarks. The study of the two Indonesian specimens and their comparison with the holotype ( BL 17.0 mm) revealed a fairly close similarity in the shape and sculpture of the shell, gills, girdle armature and radula teeth of the holotype with the larger Indonesian specimen and some differences between the smaller Indonesian chiton and the two large ones. The differences of a small specimen relate mainly to the shape of the tegmentum granules, which are less elevated and more flattened in a small chiton than in large ones. As for Belknapchiton giganteus , age-related variability is observed in the gradual elongation of the postmucronal area compared to the antemucronal area. The ratio of the length of the antemucronal area to the length of the postmucronal area in the tail valve in chitons with BL 5.0, 13.0 and 17.0 mm are 1.51, 1.30 and 1.16 respectively. It is important to note here that L. commandorensis , unlike B. giganteus , retains a constant number of aesthetes per tegmenum granule equal to 3 with age. The smallest of the available individuals ( BL 5.0 mm) turned out to be a brooding female, as it yielded three 8-valved juveniles measuring 800 x 630 µm in the pallial groove. This is the second brooding record in a deep-sea chitons after Leptochiton incubatus Sirenko, 2017 [ Sirenko, 2017].

Kingdom

Animalia

Phylum

Mollusca

Class

Polyplacophora

Order

Lepidopleurida

Family

Leptochitonidae

Genus

Leptochiton

Loc

Leptochiton commandorensis Sirenko, 2017

Sirenko, B. I. 2023
2023
Loc

Leptochiton commandorensis

Sirenko B. I. 2017: 114
2017
Loc

Leptochiton sp.1

Sirenko B. I. 2013: 148
2013
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