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Key to Irish Chitons
Species Description



Acanthochitona fascicularis  (Linnaeus 1767) [back to the Key] | [species list] | [previous]

Length: to 60 mm – the largest Irish chiton

Tegmentum colour: typically olive green with reddish blotches; the wide jugal area is usually be lighter (cream or beige) with dark longitudinal streaks. 

Sculpture: valves little or not beaked. The jugal area with faint longitudinal grooves; latero-pleural areas covered in closely-spaced, small round granules arranged in radial rows.

Girdle: broad and densely covered with short spicules, with 18 large tufts of spines arranged around the head and at the sutures. There is a distinct marginal fringe of spicules.

Bathymetric range: low-water to 50 m; lives sub-tidally on rock and in crevices.

Geographic range: Found in the north Atlantic from Ireland and Britain south to the Mediterranean and Adriatic.

Similar species: Acanthochitona crinita; Acanthochitona discrepans

Taxonomy & Synonymy:

FAMILY: ACANTHOCHITONIDAE
Acanthochitonidae Pacaud & Le Renard 1995

SUBFAMILY: ACANTHOCHITONINAE

GENUS: ACANTHOCHITONA Gray 1821

Acanthochitona fascicularis  (Linnaeus 1767 : Chiton)

= Acanthochites communis Risso 1826
= Chiton fascicularis var. major Philippi 1836
= Chiton fascicularis var. rubra Issel 1870
= Acanthochites discrepans var. minorflava Monterosato 1878 nomen nudum
= Acanthochites hamatus Rochebrune 1882
= Anisochiton discrepans var. elongata Dautzenberg 1893
= Anisochiton discrepans var. marmorata Dautzenberg 1893
= Anisochiton discrepans var. nigrolineata Dautzenberg 1893
= Acanthochites discrepans var. albina Dautzenberg & Durouchoux 1900
= Anisochiton discrepans var. viridis Pallary 1902
= Acanthochites discrepans var. violaceolimbata Dautzenberg & Durouchoux 1906
= Acanthochiton discrepans var. angustivalva Bergenhayn 1931
= Acanthochiton heterochaetus Bergenhayn 1931
= Acanthochiton communis var. barashi Leloup 1969
= Acanthochitona bonairensis Kaas 1972
? Chiton echinotus de Blainville 1825
? Acanthochites carinatus Risso 1826
! Chiton crinitus Pennant 1777 sensu Sowerby, G.B. II 1840
! Chiton discrepans Brown 1827 sensu Sowerby, G.B. II 1840

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