Ischnochiton rissoi (Payraudeau, 1826)
Mediterranean.
Surface to a few meters deep, on rocky substrates. Grazer.
Original taxon: Chiton rissoi.
Synonyms: mediterraneus, meneghinii.
5m deep, under stones, Macerata, Civitanova, Marche, E. Italy. 12mm.
« Testâ octovalvi, albo-cinereâ, colore roseo tinctâ, longitudinaliter et eleganter striatâ ; margine membranaceo, lineâ niveâ cincto ; valvis convexiusculis, infernè punctis albis minimis ornatis… » – B.-C. Payraudeau: Catalogue descriptif et méthodique des annelides et des mollusques de l’île de Corse…, Paris 1826, via BHL.

1m deep, under stones, in the harbour, Isola Rossa, NW. Corsica. 17-17mm.
Ischnochiton rissoi on its substrate, pictured by E. Schwabe on WoRMS – (CC BY-NC-SA).
Shell-development of Ischnochiton rissoi in A. Issel:
“Intorno ai Chiton del mare di Genova”, Bullettino malacologico italiano anno III, Pisa 1870.
2: Young specimen — 3: Adult specimen.
On stone, Plage du Pourrousset, Rade d’Agay, Saint-Raphaël, Var, S. France. Original picture provided by F. Piednoir for iNaturalist – (CC BY-SA).
8m deep, under stone, Bozcaada island, Çanakkale, W. Marmara province, NW. Turkey. 19,25mm.
On Pecten jacobeus, 75m deep, off Siracusa, SE. Sicilia. Original picture provided by A. Brancato (IT).
– (CC BY-NC-SA) –

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