Taxon profile


Ischnochitonidae Dall, 1889

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Polyplacophora - chitons »  order Ischnochitonina


Ischnochitonidae is a large and diverse group of chitons made up of approximately 175 species found worldwide (Rehder 1981). Morphology ranges from ovate to elongate. Ischnochiton valves may be convex to dorsally carinate with low to high elevation. Ornamentation varies from smooth to variously sculptured. Characteristics shared by individuals of this family are the presence of many slits in the insertion plates of the end valves and only 1 or 2 slits in the intermedi¬ate valves, a tail valve that is multifissured, and the non-occurrence of pectinations in the insertion plates (Cochran 1998). Dall (1889b) established the family Ischnochitonidae from the subdivision Ischnoidea. Since then, several families have been proposed in order to reconcile the morphological diversity within the family (Cochran 1998). Iredale and Hull (1927) described 3 families, Ischnochitonidae, Lepidochitonidae, and Callistochitonidae, all of which have been placed into subfamilies of the Ischnochitonidae (Cochran 1998). Presently 6 subfamilies and 27 genera are recognized in the family Ischnochitonidae (Van Belle 1983; Kaas and Van Belle 1985a, 1985b; Cochran 1998). On the Texas coast Ischnochitonidae is currently represented by 2 genera and 3 species.
Tunnell, J.W. , Andrews, J. , Barrera, N.C. & Moretzsohn, F., 2010. Encyclopedia of Texas seashells.
Author: Jan Delsing

Included taxa

Number of records: 9

subfamily Callistoplacinae Pilsbry, 1893
subfamily Callochitoninae Plate, 1901
subfamily Chaetopleurinae Plate, 1899
subfamily Ischnochitoninae Dall, 1889
subfamily Lepidochitoninae Iredale, 1914
subfamily Rapanuiinae Dell'Angelo, Raines & Bonfitto, 2004
subfamily Schizoplacinae Bergenhayn, 1955

Unplaced taxa

genus Tonicina Thiele, 1906 inc.sed.
genus Vermichiton Kaas, 1990 inc.sed.

Links and literature

EN The Interim Register of Marine and Nonmarine Genera [104700]

Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [] [as Ischnochitonidae Dall, 1889]
Data retrieved on: 30 November 2019
EN Australian Faunal Directory [51c6e47d-e3a8-4e60-a1da-c80afbe06cca]

ABRS (2009-2019): Australian Faunal Directory [], Australian Biological Resources Study, Canberra [as Ischnochitonidae]
Data retrieved on: 16 February 2015

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inc.sed. incertae sedis - uncertain placement within this taxon