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Trapezognathus
Taxonomy
Trapezognathus was named by Lindström (1955). Its type is Trapezognathus quadrangulum.
It was assigned to Balognathidae by Stouge and Bagnoli (1999), Carlorosi and Heredia (2013).
It was assigned to Balognathidae by Stouge and Bagnoli (1999), Carlorosi and Heredia (2013).
Species
T. diprion (syn. T. argentinensis), T. quadrangulum (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1955 | Trapezognathus Lindström |
| 1999 | Trapezognathus Stouge and Bagnoli p. 153 |
| 2013 | Trapezognathus Carlorosi and Heredia p. 5 |
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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. †Trapezognathus Lindström 1955
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†Trapezognathus diprion Lindström 1955
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Invalid names: Trapezognathus argentinensis Rao and Hunicken 1994 [synonym]
†Trapezognathus quadrangulum Lindström 1955
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. M. T. Carlorosi and S. E. Heredia 2013 | Stouge & Bagnoli (1990): “The Trapezognathus Lindström apparatus is septimembrate, with pectiniform P elements, geniculate M elements and a complete series of S elements (alate, tertiopedate, bipennate, quadriramate). P elements are adenticulate to weakly denticulate. M element is adenticulate to denticulate and the cusp forms an angle about 90º with the upper margin of the base. S elements are stubby, with a base higher than the cusp, weakly denticulate to denticulate. All elements are albid and have a deep basal cavity and large basal sheath”. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum | |||||
| References: Aberhan 1992, Carroll 1988 | |||||
Collections (26 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Floian | Russian Federation | T. quadrangulum (61782 61785 61789 61790 61792) | |
| Floian | Iran | T. diprion (116504) | |
| Floian | Peru | T. diprion (210687) | |
| Floian - Dapingian | Argentina (Jujuy) | T. quadrangulum, T. diprion (210131) | |
| Arenig | China (HeBei) | T. sp. (7975) | |
| Dapingian | Iran | T. quadrangulum (116507) T. sp. (116505) | |
| Volkhov | Estonia (Harju) | T. quadrangulum (203618 203619 203620 203621 203622 203634 203635 203636 203637 203638 203639) | |
| Volkhov | Russian Federation | T. quadrangulum (61797 61798 61799) | |
| Llanvirn | Argentina | T. quadrangulum (8893) |