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Stegotrachelus
Taxonomy
Stegotrachelus was named by Woodward and White (1926) [Sepkoski's age data: D Eife Sepkoski's reference number: 1066]. It is not extant.
It was assigned to Palaeonisciformes by Sepkoski (2002); and to Actinopterygii by Swartz (2009).
It was assigned to Palaeonisciformes by Sepkoski (2002); and to Actinopterygii by Swartz (2009).
Species
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. †Stegotrachelus Woodward and White 1926
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†Stegotrachelus finlayi Woodward and White 1926
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. A. Swartz 2009 | See Woodward & White (1926: 567) and Gardiner (1963: 295) with the following amendments: – Stegotrachelus finlayi is an early actinopterygian differing from Moythomasia spp. by one or more of the following character state combinations: parietals up
to two times longer than the postparietals; contact between the intertemporal and supratemporal anterior to that between the parietal and postparietal; a T-shaped dermosphenotic with a posterior ramus up to one-third of the length of the entire bone; contact between intemporal and nasal excluding dermosphenotic–parietal contact; intemporal–nasal contact; an absence of remodelled porous ganoine on the lower jaw; a slight nuchal hump; one pair of extrascapulars; polymorphic fringing fulcra; an anal fin shifted posterior relative to the dorsal fin; a hypochordal lobe shorter than the chordal lobe; and the following fin-ray counts: dorsal-fin rays, 39–42; analfin rays, 42–48; pectoral-fin rays, 17–21; pelvic-fin rays, 18–20; caudal-fin rays, 92–99. See scalecounting data for additional details. |