|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Polyplacophora - Mattheviidae
It was assigned to Chelodidae by Bergenhayn (1943); to Paleoloricata by Sepkoski (2002); and to Mattheviidae by Runnegar et al. (1979), Cherns (1998) and Pojeta et al. (2010).
|Year||Name and author|
|1874||Chelodes Davidson and King p. 167 figs. pl. 18 f. 14|
|1979||Praecanthochiton Runnegar et al. p. 1387|
|1979||Chelodes Runnegar et al. p. 1388|
|1998||Chelodes Cherns p. 548|
|2002||Chelodes Sepkoski, Jr.|
|2002||Eochelodes Sepkoski, Jr.|
|2002||Praecanthochiton Sepkoski, Jr.|
|2010||Chelodes Pojeta et al. pp. 9 - 11|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|B. Runnegar et al. 1979||Medium-sized to large vermiform chiton with body armor of probably seven massive calcareous plates (valves) that were very likely surrounded by a girdle covered with calcareous spicules; body, tail, and presumably head valves covered externally with comarginal growth lines; head valve similar in shape to body valves but with rounded anterior edge; anterior edge of body valves deeply embayed, posterior face flattened, extending forwards for one-third to one-half of valve length; interior (ventral) surface without concavity or with shallow to deep depression below edge of flat posterior face; in some plates this depression may continue towards plate apex as a fine tapered hole; tail valve elongate, curved or triangular in lateral profile, sometimes terminating posteriorly or posterodorsally in a raised pointed apex; tail valve internally (ventrally) concave, sometimes with a small hole beneath apex.|