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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).

Synonymy list
YearName and author
1926Stegotrachelus Woodward and White
2002Stegotrachelus Sepkoski, Jr.
2009Stegotrachelus Swartz

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
RankNameAuthor
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
superclassActinopterygii(Cope 1887)
genusStegotrachelusWoodward and White 1926

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.

Diagnosis
ReferenceDiagnosis
B. A. Swartz 2009See 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.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: marinesubp
Locomotion: actively mobilec
Created: 2004-08-17 14:52:40
Modified: 2009-07-20 23:50:42
Source: c = class, subp = subphylum
Reference: Carroll 1988

Age range: Givetian or 387.70000 to 382.70000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Givetian387.7 - 382.7United Kingdom (Scotland) S. finlayi (197264 197265)