Nick Upton's picture

Spiny Chiton

Observed: 22nd July 2012 By: Nick UptonNick Upton’s reputation in InvertebratesNick Upton’s reputation in InvertebratesNick Upton’s reputation in InvertebratesNick Upton’s reputation in Invertebrates
Chiton (Acanthochitona crinitus) attached to rocks exposed at low tide, Rhossili, The Gower Peninsula, UK, July.
Description:

A 2cm chiton with 8 tufts of bristles on a Welsh shore, an Acanthochitona sp. I'm sure and crinita I think, A. fascicularis looks very similar, but I think the flat topped granules on the dorsal plates make it crinita.

Identifications
Species interactions

No interactions present.

Comments

ChrisMcA's picture

Agree the only uk chitons w.

Agree the only uk chitons w. bristle tufts on their girdles are Acanthochitona (after Yonge '76), & only 2 species as A. discrepans is a synonym.I've found (from google pictures) a virtually identical pic of Acanthochitona crinita=petit chiton epineux at http://doris.ffessm.fr/fiche2.asp?fiche_numero=700 (with 6 photos)
& Acanthochitona fascicularis=grand etc etc at http://doris.ffessm.fr/fiche2.asp?fiche_numero=717 (with 14 photos)
You can get a google translation of each by searching "petit chiton epineux" etc. (& so get for crinitas "dorsal granulation coarse & uneven" & for fascicularis "fine & even").So i'm as sure as I can be.

Nick Upton's picture

Bristled chitons

Many thanks Chris. The distinction between A crinita and fascicularis does seem to be a fine one, and after checking many sources and images I'd also veered towards crinita based on the granulation pattern and this french source seems to help support the ID..

Nick Upton, naturalist and photographer.