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Prothrissacanthias
Taxonomy
Prothrissacanthias was named by Villier et al. (2007). Its type is Prothrissacanthias africanus.
It was assigned to Astropectinidae by Villier et al. (2007).
It was assigned to Astropectinidae by Villier et al. (2007).
Species
P. africanus (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Prothrissacanthias Villier et al. p. 415 |
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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. †Prothrissacanthias Villier et al. 2007
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†Prothrissacanthias africanus Villier et al. 2007
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. Villier et al. 2007 | Disc of medium size, arm short, regularly atenuating, R/r = 3. Interbrachial arc angular. Marginal plates few, 2-4 cuneate interbrachial marginal plates differentiated. Superomarginal and infeomaginal rows opposite, aligned abradially, without intermarginal facioles. Superomarginal plates with ornament of few large tubercles bearing each a small conical spine. Inferomarginal plates with three to five tubercles aligned in the plate axis, with robust conical spines inserted on. Additional shorter spines attached to few small tubercles. Actinolateral fields reduced, a single row of actinolateral plates extending to the mid length of the arm. Adambulacral plates short, with a large tubercle bearing a single subambulacral spines, and three to four aligned tubercles for furrow spines. Oral plates tall, flatened, with ornament of five tubercles for attachement of spines. First adambulacral intermediate between the adjoining oral and the other adambulacral plates. Ambulacral large, short, tall, perpendicular to the radial plane. Terminal plate conical, with a surface covered with tubercles. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Blake 1990, Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: Late/Upper Berriasian or 145.00000 to 140.20000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Berriasian | Algeria | P. africanus (64322) |