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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), Van Der Laan (2019).
It was assigned to Poraspidinae by Elliott and Petriello (2011); and to Poraspidae by Kiaer (1932), 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 | |||||
| References: Carroll 1988, Kiessling 2004 | |||||
Age range: base of the Ludlow to the top of the Late/Upper Emsian or 426.70000 to 393.47000 Ma
Collections (29 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ludlow - Pridoli | Canada (Nunavut) | P. polaris (237773 237776) | |
| Early/Lower Lochkovian | United Kingdom | P. polaris (238749) | |
| Lochkovian - Early/Lower Lochkovian | Canada (Northwest Territories) | P. polaris (237847 237849) | |
| Lochkovian | Russian Federation | P. sp., P. polaris (90330) | |
| Lochkovian | France | P. sp. (26983) | |
| Lochkovian | Ukraine | Cyathaspis sturi (90350) P. sturi (239124 239220 239230 239237 239246) | |
| Lochkovian | United Kingdom (Herefordshire) | P. sericea (201736) | |
| Lochkovian | Norway | P. polaris, P. brevis (237816) P. sp. (26929 237815 237817 237818 237821 237822 237823 237824 237825) | |
| Lochkovian - Early/Lower Emsian | Canada (Northwest Territories) | P. polaris (237843) P. sp., P. polaris (237829) | |
| Lochkovian - Eifelian | Ukraine (Ternopil) | P. sturi (237769) | |
| Pragian | Russian Federation | P. sp. (90331) | |
| Late/Upper Emsian | USA (California) | Cyathaspididae indet. (206449) |