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Phragmactis grayae
Taxonomy
Phragmactis grayae was named by Spencer (1940). It is not extant. Its type specimen is Holotype BMNH E53414a, b. Its type locality is Locality 5. “Starfish Bed,” small cliff above S. bank of Lady Burn River, 100 meters south of South Treave Farmhouse, Thraive Glen, Girvan, which is in a Rawtheyan carbonate limestone in the South Threave Formation of the United Kingdom.
Synonymy list
| Year | Name and author |
|---|---|
| 1940 | Phragmactis grayae Spencer p. 534 figs. figs. 331A, 343-345; pl. 57 fig. 1-5 |
| 1965 | Phragmactis grayae Owen pp. 547-548 |
| 1966 | Phragmactis grayae Spencer and Wright p. U81 figs. fig. 69, 1a-b |
| 2005 | Phragmactis grayae Dean Shackleton p. 60 figs. figs. 8B, 12E; pl. 1 figs 1, 2; pl. 2 fi |
| 2014 | Phragmactis grayae Blake p. 1164 |
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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.
†Phragmactis grayae Spencer 1940
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Dean Shackleton 2005 | As for the genus by monotypy | |
| D. B. Blake 2014 | Phragmactinid lacking body-wall ossicles dorsal to marginals. Marginals in single series, their form shield-like. Axillary ventral, large, shield-like. Madreporite ventral in position but dorsal to marginal-axillary series. Podial pores lacking throughout arm length. Adambulacral forming an abradial rim to the ambulacral podial basin; adambulacrals broadest distally where abutting ambulacral transverse ridge, narrowing proximally. Ventral edge of MAO pair narrow, forming a possibly spine-bearing ridge. |
Measurements
No measurements are available
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| Source: subp = subphylum, p = phylum | |||||
| References: Bambach et al. 2007, Aberhan 1992 | |||||