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Leptaena (Leptaena) diademata

Strophomenata - Strophomenida - Rafinesquinidae

Taxonomy
Leptaena diademata was named by Williams (1962). Its type specimen is BB.15878, a shell (complete shell), and it is a 3D body fossil. Its type locality is 500 yards south-south-east of Glendrissaig Farm, which is in a Burrellian offshore mudstone in the Balclatchie Formation of the United Kingdom.

It was recombined as Leptaena (Leptaena) diademata by Candela and Harper (2014).

Sister species lacking formal opinion data
L. dicax, L. ingrica

Synonymy list
YearName and author
1962Leptaena diademata Williams pp. 197 - 198 figs. P1. XIX, figs. 4, 5, 7
2014Leptaena (Leptaena) diademata Candela and Harper pp. Supplement 1

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyRafinesquinidaeSchuchert 1893
subfamilyLeptaeninaeHall and Clarke 1894
genusLeptaenaDalman 1828
subgenusLeptaenaDalman 1828
speciesdiademata()

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.

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Diagnosis
ReferenceDiagnosis
A. Williams 1962Small, quadrate Leptaena with a biplanate visceral disc, between 6 and 8 mm. long, separated from the geniculate zone, which is disposed at about 110 ~ to the disc, by a wide, high, concentric corrugation of the entire shell, which is convex ventrally; brachial valve faintly sulcate medianly; radial ornamentation with closely spaced, differentially thickened costellae, about 8 per millimetre anteromedianly, disc corrugated by 7 low rugae tending to die out anteriorly; socket plates united by secondary shell deposit with a thick, short, median ridge to form an anchor-shaped elevation, dorsal muscle-scars impressed on either side of median ridge and further divided by two pairs of short, divergent septa, high median septum situated anterior to median ridge flanked by a pair of long, curved ridges; ventral interior unknown.