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Key to Irish Chitons
Species Description



Tonicella marmorea (Fabricius 1780) [back to the Key] | [next] | [previous]

Length: up to 40 mm in the North-eastern Atlantic (slightly smaller in the North-western Atlantic)

Tegmentum colour: white, lighter or darker red or brownish, often with large patches of reddish or dark brown, sometimes with narrow, alternating bands of light and darker red or with V-shaped white lines

Sculpture: Valves appear smooth, but covered with minute granules in quincunx. Many growth lines are easily visible, especially on the lateral areas and anterior margins of the intermediate valves.

Girdle: relatively broad, appears leathery to the naked eye, coloured with alternating zones of light and dark brown, or with light splotches

Bathymetric range: from low-water to 230 m

Geographic range: an artic-boreal species, found in the North Atlantic and North Pacific. In the north-eastern Atlantic Ocean, found from Greenland and Scandinavia to the North coast of France; found also in the Western Atlantic down to Massachusetts, and in the North Pacific from the Bering Sea to northern Japan.

Similar species: Tonicella rubra

Taxonomy and Synonymy:

FAMILY: ISCHNOCHITONIDAE
Ischnochitonidae Dall, 1889

SUBFAMILY: LEPIDOCHITONINAE

GENUS: TONICELLA Carpenter 1873

Tonicella marmorea  (Fabricius 1780 : Chiton) 

= Chiton laevigatus Fleming 1813            
= Chiton latus Lowe 1825            
= Chiton fulminatus Couthouy 1838            
= Chiton pictus Bean in Thorpe 1844            
= Chiton submarmoreus Middendorff 1847          
= Chiton flemingius Leach 1852           
= Chiton marmoreus var. caerulea Winkley 1894            
= Tonicella blaneyi Dall 1905            
! Chiton ruber Linné 1767  sensu Spengler 1797            

Synonyms (=); Dubious synonyms (?); Mis-identifications (!)