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Streblochondria tiltoni

Bivalvia - Pectinida - Streblochondriidae

Streblochondria tiltoni was named by Busanus and Hoare (1991) [= Streblochondria sp. GORDON AND HENRY, 1981, P1. 4, figs. 17, 18.]. Its type specimen is USNM 452300, a shell, and it is a 3D body fossil. Its type locality is Interbedded shales & limestones, Reynolds Limestone, Greer Limestone Co. quarry, which is in a Chesterian marine shale/limestone in the Reynolds Limestone Formation of West Virginia.

Sister species lacking formal opinion data

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Synonymy list
YearName and author
1991Streblochondria tiltoni Busanus and Hoare pp. 471 – 472 figs. 4.16 – 4.20

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EubilateriaAx 1987
subclassAutobranchia(Groblen 1894)
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
OstreioniFerussac 1822
OstreataFerussac 1822
superorderOstreiformiiFerussac 1822
orderPectinida(Gray 1854)
suborderAnomiidinaGray 1854
AviculopectinoideiStarobogatov 1992
superfamilyChaenocardioideaMiller 1889
familyStreblochondriidaeNewell 1938

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.

J. W. Busanus and R. D. Hoare 1991Streblochondria with broad, low, radiating costae on both valves; costae crossed by slightly smaller, low, rounded, comarginal ridges, more prominent on right valves.

Right valve subcircular, slightly higher than long, with margins in ventral half nearly equally convex; hingeline shorter than valve length; posterior auricle with broadly obtuse marginal angle, separated from shell body by distinct sulcus; anterior auricle more distinct, separated from shell body by deep, pronounced sulcus; shell body with numerous, closely spaced, low, rounded costae crossed by slightly narrower, closely spaced, low, faint, comarginal ridges giving a reticulate appearance; anterior auricle with pronounced comarginal lamellae; posterior auricle with growth lines.

Left valve narrower and more elongate in appearance than right valve; hingeline short; ornamentation similar to right valve but less pronounced; both auricles with growth lines only.

Streblochondria tiltoni is easily distinguished from other species of the genus by the presence of the low, rounded costae crossed by low rounded ridges on both valves. One specimen of a right valve, believed to belong to this species (Figure 4.19), has an essentially smooth shell, which would indicate significant variation in the development of the ornamentation.

This species is most closely related to Streblochondria simpliciformis (Girty, 1927) in terms of overall size of shell and lack of well-developed surface ornamentation. It differs from Girty’s species in having a less convex posterior margin and the presence of radial and transverse ornamentation. Streblochondria similis (Walcott, 1884) and S. tenuilineata (Meek and Worthen, 1860) are larger, more ovate, and have much stronger ornamentation than S. tiltoni.