Leptochiton antarcticus Sirenko 2015

Leptochiton antarcticus Sirenko, 2015 Leptochiton antarcticus Sirenko, 2015a: 139, figs 1–7; 2019b: 71, Figs 1–3. Type material. Holotype (ZISP 2250); 2 paratypes (ZISP 2251, 2252). Type locality. Southern Ocean, Scotia Sea, off South Sandwich Islands, 59°42.0’S, 28°12.9’W, 142–160 m, gravel, mud. R...

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Bibliographic Details
Main Author: Sirenko, Boris
Format: Other/Unknown Material
Language:unknown
Published: Zenodo 2024
Subjects:
Biodiversity
Taxonomy
Animalia
Mollusca
Polyplacophora
Lepidopleurida
Leptochitonidae
Leptochiton
Leptochiton antarcticus
Antarc*
Antarctica
antarcticus
Scotia Sea
South Sandwich Islands
Southern Ocean
Online Access:https://doi.org/10.5281/zenodo.12730839
http://treatment.plazi.org/id/AB6287B3DE5BFF71FF0602A8FF3FFB96
Description
Summary:Leptochiton antarcticus Sirenko, 2015 Leptochiton antarcticus Sirenko, 2015a: 139, figs 1–7; 2019b: 71, Figs 1–3. Type material. Holotype (ZISP 2250); 2 paratypes (ZISP 2251, 2252). Type locality. Southern Ocean, Scotia Sea, off South Sandwich Islands, 59°42.0’S, 28°12.9’W, 142–160 m, gravel, mud. Remarks. Besides the widespread specimens known from the slopes of Antarctica, the only other report of a specimen of this species was found on the slope of Nintoku Seamount (Sirenko 2019b). Externally, L. antarcticus differs little from the other two species of the Emperor Seamounts ( Leptochiton milwaukensis n. sp . and Belknapchiton belknapi ). Like these species, L . antarcticus also has tegmentum granules arranged quincuncially on the head valve, lateral areas of intermediate valves and postmucronal area of tail valve and the dorsal scales have longitudinal ribs. Leptochiton antarcticus differs from L. milwaukensis n. sp. by having 5 round pores of aesthetes in granules of the tegmentum ( vs. 3 pores, 2 of them slit-shaped in L. milwaukensis n. sp. ). The shape of the central teeth of the radula is also very different in these two species. Leptochiton antarcticus differs from Belknapchiton belknapi by having 5 aesthetes in granules of the tegmentum ( vs . 3 aesthetes in B. belknapi ) and 12–16 longitudinal ribs on the dorsal scales ( vs . 1–3 ribs in B. belknapi ). The shape of the central teeth of the radula is very different in these two species. Published as part of Sirenko, Boris, 2024, The chitons of the family Leptochitonidae (Mollusca: Polyplacophora) from the Emperor Seamounts, Pacific Ocean, pp. 522-532 in Zootaxa 5474 (5) on page 528, DOI:10.11646/zootaxa.5474.5.4, http://zenodo.org/record/12730823

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