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Diambonioidea koknaiensis

Strophomenata - Strophomenida - Grorudiidae

Taxonomy
Diambonioidea koknaiensis was named by Popov and Cocks (2014). Its type specimen is BC 58859 (dorsal internal mould) and is a 3D body fossil.

Synonymy list
YearName and author
2014Diambonioidea koknaiensis Popov and Cocks p. 723 figs. 13W, 14V–Z

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
RankNameAuthor
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familyGrorudiidaeCocks and Rong 1989
genusDiambonioideaZeng 1987
specieskoknaiensis

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.

†Diambonioidea koknaiensis Popov and Cocks 2014
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Diagnosis
ReferenceDiagnosis
L. E. Popov and L. R. M. Cocks 2014Diambonioidea with planoconvex shell, multicostellate radial ornament and a small bema less than half as long as the platform.
Shell flattened, almost planoconvex, strongly transverse, about twice as wide as long, with maximum width at hinge line; cardinal extremities slightly acute. Anterior commissure rectimarginate. Ventral valve gently convex with sagittal profile more strongly curved in anterior one-third valve length. Ventral interarea low, planar, anacline with the delthyrium covered apically by a minute pseudodeltidium. Dorsal valve almost flat with a linear, anacline interarea. Radial ornament almost equally multicostellate with up to 6 ribs per mm. Concentric ornament of very fine, evenly spaced fila. Ventral interior with minute teeth lacking dental plates and a small, gently impressed, bilobed muscle field bisected by a faint median ridge and occupying slightly less than one-quarter valve length. Dorsal interior with undercut cardinal process merged with narrow, transverse socket ridges. Dorsal adductor muscle field on elevated bema, about 35–40% as long as the valve. Radially arranged adductor muscle scars separated by a pair of short, side septa terminating at margins of the bema. Median septum prominent, merged anteriorly with the rim bounding the platform.