Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands Author Dell’Angelo, Bruno Museo di Zoologia, Via Selmi 3, 40126 Bologna, Italy bruno.dellangelo@chitons.it Author Schwabe, Enrico Bavarian State Collection of Zoology, Münchhausenstrasse 21, 81247 München, Germany enrico.schwabe@zsm.mwn.de Author Gori, Sandro Via Sernesi 7, 57123 Livorno, Italy; Author Sosso, Maurizio Via Bengasi 4, 16153 Genova, Italy Author Bonfitto, Antonio Dipartimento di Scienze Biologiche, Geologiche e Ambientali (BiGeA), Via Selmi 3, 40126 Bologna, Italy; antonio.bonfitto@unibo.it text African Invertebrates 2014 2014-07-16 55 2 171 200 journal article 58582 10.5281/zenodo.7680891 0eaabf0d-5f07-4d53-aad2-9372ccac3303 2305-2562 7680891 B5CAA0D6-6F90-4311-899F-210544BFDCFF Ischnochiton cf. rissoi ( Payraudeau, 1826 ) Figs 2I–K Chiton rissoi : Payraudeau 1826: 87 , pl. 3, figs 4–5. Ischnochiton ( I. ) rissoi : Kaas & Van Belle 1990: 78 , fig. 32; Dell’Angelo & Smriglio 1999: 100, pls 29–31, figs 40–48. Syntype :MNHN 6109 (not seen). Type locality: France , Bonifacio , Corse ( 41°23'10"N 09°09'31"E ). Material examined: ST06: 1 specimen , length 1.3 mm ( BD 107 ) . Distribution: São Tomé Island . Comparison and remarks: The single available specimen shares with Ischnochiton rissoi a similar tegmental sculpture and dorsal girdle scales. I. rissoi varies considerably in size and sculpture ( Carmona Zalvide & García 1999 ; Dell’Angelo & Smriglio 1999). The sculpture of the specimen examined is similar to the “forma 4” described by Carmona Zalvide and García (1999) , from the Gibraltar area. The minute size of the specimen and the fact that the nominal species has so far not been reported from the African Atlantic coast, led us to the tentative identification. I. rissoi is typically Mediterranean, and recorded from the Atlantic only in the vicinity of Gibraltar . Records from the Canary Islands ( Shuttleworth 1853 ; Bergenhayn 1931 ) as well as the Selvagens and Azores Islands ( Bergenhayn 1931 ) require confirmation.