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Poraspis
Taxonomy
Poraspis was named by Kiaer (1932) [Sepkoski's age data: S Prid D Gedi-u Sepkoski's reference number: 2]. Its type is Holaspis sericeus.
It was assigned to Poraspidinae by Elliott and Petriello (2011); and to Poraspidae by Kiaer (1932) and Van Der Laan (2019).
It was assigned to Poraspidinae by Elliott and Petriello (2011); and to Poraspidae by Kiaer (1932) and Van Der Laan (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1932 | Poraspis Kiaer p. 13 figs. Fig. 1 & 2; Pl. I; Pl. Il; Pl. Ill, 1,2 &3 |
| 2011 | Poraspis Elliott and Petriello p. 520 |
| 2019 | Poraspis Van Der Laan p. 17 |
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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. †Poraspis Kiaer 1932
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†Poraspis barroisi Leriche 1906
†Poraspis brevis Kiaer 1932
†Poraspis cylindrica Kiaer 1932
†Poraspis elongata Kiaer 1932
†Poraspis intermedia Kiaer 1932
†Poraspis magna Kiaer 1932
†Poraspis polaris Kiaer 1932
†Poraspis rostrata Kiaer 1932
†Poraspis sericea Lankester 1873
†Poraspis sturi von Alth 1874
†Poraspis subtilis Kiaer 1932
†Poraspis thomasi Elliott and Petriello 2011
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. K. Elliott and M. A. Petriello 2011 | (Modified after Elliott et al., 1998.) Rostral region narrowing in front of orbits; anterior border has a slight median convexity; maxillary brim broad, covered with ridges parallel to anterior edge. Postbranchial lobe of dorsal shield generally long and strongly developed. Posterior margins of dorsal and ventral shields bear pronounced, rounded, median lobes. Dentine ridges fine, 7–13 per mm; ridge pattern mostly longitudinal but may be fanned or irregular on rostrum and anterior triangle of dorsal shield; generally one or more ridges parallel to anterior edge of shield. Epitega indicated faintly or not at all. Pineal macula distinct. Lateral line pores and canals large. |
Measurements
No measurements are available
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| Source: subp = subphylum, p = phylum | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Lochkovian to the top of the Late/Upper Emsian or 419.20000 to 391.90000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lochkovian | Russian Federation | P. sp., P. polaris (90330) | |
| Lochkovian | Norway | P. sp. (26929) | |
| Lochkovian | France | P. sp. (26983) | |
| Lochkovian | Ukraine | Cyathaspis sturi (90350) | |
| Pragian | Russian Federation | P. sp. (90331) | |
| Late/Upper Emsian | USA (California) | Cyathaspididae indet. (206449) |