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Phragmactis grayae

- Phragmactinidae

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
YearName and author
1940Phragmactis grayae Spencer p. 534 figs. figs. 331A, 343-345; pl. 57 fig. 1-5
1965Phragmactis grayae Owen pp. 547-548
1966Phragmactis grayae Spencer and Wright p. U81 figs. fig. 69, 1a-b
2005Phragmactis grayae Dean Shackleton p. 60 figs. figs. 8B, 12E; pl. 1 figs 1, 2; pl. 2 fi
2014Phragmactis grayae Blake p. 1164

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
RankNameAuthor
phylumEchinodermata
subphylumAsterozoa
familyPhragmactinidae()
genusPhragmactis
speciesgrayae

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.

Diagnosis
ReferenceDiagnosis
J. Dean Shackleton 2005As for the genus by monotypy
D. B. Blake 2014Phragmactinid 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.