Indonesian chitons of the genera Belknapchiton Sirenko, Saito et Schwabe, 2022 and Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Leptochitonidae) Author Sirenko, B. I. text Ruthenica, Russian Malacological Journal 2023 2023-04-03 33 2 79 94 http://dx.doi.org/10.35885/ruthenica.2023.33(2).4 journal article 10.35885/ruthenica.2023.33(2).4 2307-7336 11041944 Belknapchiton simplex ( Nierstrasz, 1905 ) Lepidopleurus simplex Nierstrasz, 1905: 4 , pl. 1, fig. 3, pl. 2, figs 44–47. Leptochiton alveolus . – Ferreira, 1979: 152 , fig 14 , non Chiton alveolus Lovén,1846 . Leptochiton ( Leptochiton ) alveolus . – Kaas, Van Belle, 1985: 36 , fig. 14 , non Chiton alveolus Lovén,1846 . Leptochiton ( Leptochiton ) belknapi . – Kaas, Van Belle, 1987: 10, fig. 24, non Leptochiton belknapi Dall, 1878 . Belknapchiton simplex . – Sirenko et al. , 2022: 104 . Type material. Lectotype ( ZMA .MOLL.138623), and paralectotype ( ZMA .MOLL.138612), designated by Ferreira [1979] . Type locality. Indonesia , Strait of Macassar , 0°34.6’N , 119°8.5’E , 1301 m . Distribution. Only known from the type locality. Remarks. This species differs from other relatives by dorsal scales with six longitudinal ribs and carinated valves. It is necessary to compare this species with B. japonicus (Thiele, 1909) , which is widespread not only off the coast of Japan , but also off New Caledonia and the Solomon Islands [Sirenko, 2016].