Leptochiton rissoi ( Nierstrasz, 1905 )

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 : 88-89

publication ID

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

DOI

https://doi.org/10.5281/zenodo.11172628

persistent identifier

https://treatment.plazi.org/id/1B1DC90A-E808-0653-3BDC-F8361276F85F

treatment provided by

Felipe

scientific name

Leptochiton rissoi ( Nierstrasz, 1905 )
status

 

Leptochiton rissoi ( Nierstrasz, 1905) View in CoL

Lepidopleurus rissoi Nierstrasz, 1905: 6 View in CoL , figs 5, 52–55; Ferreira, 1979: 163, figs 30–32.

LLeptochiton (Leptochiton) rissoi . – Kaas, Van Belle, 1985: 110, fig. 48, map 24.

Type material. Lectotype ( ZMA.MOLL 138601), designated by Ferreira, 1979.

Type locality. Celebes Sea , N of Manado, Indonesia, 3°27.1’N 125°18.7’E, 2053 m ( Siboga, St. 126) GoogleMaps .

Distribution. Indian Ocean (off Sumatra Island), Pacific Ocean, Philippines, Indonesia, New Guinea, Solomon Islands, 875–2120 m, more common deeper than 1000 m.

Remarks. The following morphological features of the lectotype were not mentioned in Nierstrasz [1905] and Kaas and Van Belle [1985]: the head valve is 1.2 times wider than the tail valve; the apophysis of the valve V is 1.3 times wider than the jugal sinus; the tegmentum granules are oval on the central area and round on the lateral areas with one megalaesthete and 6 micraesthetes; The head of the major lateral tooth of the radula is bidentate instead of unidentate as mentioned in Kaas, Van Belle [1985].

A study of the lectotype of this species ( ZMA. MOLL 138601) and other available specimens indicate that the number of aesthetes in an aesthete group ranges from 6 to 20, regardless of body size. This variability together with a longitudinal arrangement of the granules is similar to L. vietnamensis Sirenko, 1998 . The main difference between both species is the ratio of the width of the apophysis to the width of the jugal sinus, which is always greater than 1 in L. rissoi (vs less than 1 in L. vietnamensis ).

ZMA

Universiteit van Amsterdam, Zoologisch Museum

Kingdom

Animalia

Phylum

Mollusca

Class

Polyplacophora

Order

Lepidopleurida

Family

Leptochitonidae

Genus

Leptochiton

Loc

Leptochiton rissoi ( Nierstrasz, 1905 )

Sirenko, B. I. 2023
2023
Loc

LLeptochiton (Leptochiton) rissoi

Kaas P. & Van Belle, R. A. 1985: 110
1985
Loc

Lepidopleurus rissoi

Nierstrasz H. F. 1905: 6
1905
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