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Echinochimaera
Taxonomy
Echinochimaera was named by Lund (1977) [Sepkoski's age data: C Serp-l Sepkoski's reference number: 746,1066]. Its type is Echinochimaera meltoni.
It was assigned to Chimaeriformes by Sepkoski (2002); and to Echinochimaeridae by Lund (1977), Nelson (2006).
It was assigned to Chimaeriformes by Sepkoski (2002); and to Echinochimaeridae by Lund (1977), Nelson (2006).
Species
E. meltoni (type species), E. snyderi
Synonymy list
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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.
G. †Echinochimaera Lund 1977
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†Echinochimaera meltoni Lund 1977
†Echinochimaera snyderi Lund 1988
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. Lund 1977 | Echinochimaeroids with four large paired supraorbital denticles in males and one large median postorbital denticle in both sexes. The dorsal fin spine is straight or slightly curved forward distally in mature males, compressed, with a grooved posterior margin for the proximal 2/3 of its length, ornamented laterally by eight to nine small vertically aligned rows of tubercles, and anterodistally by a cluster of denticles that are considerably enlarged in males. Both dorsal fins are short based. A short anal fin is present immediately anterior to the caudal fin.
The rostrum is short and rounded, the orbital region is expanded to almost completely cover the otic region of the braincase. The body is rounded and clearly differentiated from the narrow caudal region. The prepelvic tenaculum is long, thin, well calcified in three segments and capped by a single large hook. The pelvic mixopterygium of each side is long, thin and straight. Squamation of the body and fins is placoid, with each denticle having a stellate base. There is a row of enlarged trifid denticles on each side of the dorsal midline between the second dorsal fin and the origin of the epichordal lobe of the tail. |