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Leptaena (Leptaena) enucleata

Strophomenata - Strophomenida - Rafinesquinidae

Taxonomy
Leptaena (Leptaena) enucleata was named by Klenina (1984). Its type specimen is IGNA 411/158, a valve (exfoliated ventral valve), and it is a 3D body fossil.

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

Synonymy list
YearName and author
1984Leptaena (Leptaena) enucleata Klenina p. 101 figs. pl. 8, figs 12–16
2014Leptaena (Leptaena) enucleata Popov and Cocks pp. 709 - 710 fig. 12O–T

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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
speciesenucleataKlenina 1984

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
L. E. Popov and L. R. M. Cocks 2014 Shell concavoconvex, with sharp anterior dorsal geniculation. Outline transverse subtrapezoidal, with maximum width at hinge line; cardinal extremities acute and alate. Ventral valve lateral profile very gently convex posterior to the geniculation, accentuated by high, angular rim and corresponding to the valve highest point. Ventral interarea apsacline with a small, convex pseudodeltidium. Dorsal valve concave, almost flat posterior to the geniculation. Dorsal interarea low, anacline, with strong, convex chilidium. Radial ornament almost equally multicostellate, with 4 to 5 rounded ribs per mm along the anterior margin of mature specimens. Concentric ornament with 5 to 8 slightly undulating rugae posterior to the geniculation and fine, crowded filae from 10 to 12 per mm. Ventral interior with small teeth, supported by thin, widely divergent dental plates. Ventral muscle field almost circular, surrounded by strong muscle bounding ridges. Dorsal interior with a double cardinal process on a low notothyrial platform, and low, almost straight, broadly divergent socket plates. Median septum and a pair of transmuscle ridges variably developed, which may be strong in some specimens and almost indiscernible in others from the same population.