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Glyptorthis daytonensis

Rhynchonellata - Orthida - Glyptorthidae

Orthis daytonensis was named by Foerste (1887) [Lectotype designated by Wright & Stigall (2014).]. Its type specimen is USNM 84828 and is a 3D body fossil. Its type locality is Soldier’s Home, 2.5 miles west of Dayton, which is in an Aeronian carbonate limestone in the Brassfield Formation of Ohio.

It was recombined as Glyptorthis daytonensis by Schuchert and Cooper (1932) and Wright and Stigall (2014).

Synonymy list
YearName and author
1887Orthis daytonensis Foerste p. 87 figs. pl. 13, figs 13a–d, 20a, b, 21
1932Glyptorthis daytonensis Schuchert and Cooper p. 90
2014Glyptorthis daytonensis Wright and Stigall p. 895 fig. 1A–C

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyGlyptorthidae(Schuchert and Cooper 1931)
genusGlyptorthisFoerste 1914

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.

A. F. Foerste 1887Dorsal valve wider than long, very convex, greatest convexity being just behind the l1.1iddle, thence sloping ahnost equally on all sides, except toward the postero-Iateral regions, which are somewhat compressed; a faint luesial sinus towards the beak. Cardinal area narrow, foran.1ell broadly triangular, cardinal process. narrow, compressed laterally, and situated beyond a line connecting the lower edges of the cardinal area, or on the line itself; not filling the formnen.

Ventral valve flattish, its greatest convexity one fourth the distance from the beak or even doser; thence sloping towards the posterolateral extretllities and the anterior rnargin, causing the anterior portion of the valve to b~ depressed, and leaving that portion of the shell extending from. the beak to about the 111iddle of the lateral margins elevated above the other portions of the valve.

'rhe interior of a ventral valve found will be sufficiently explained by Fig. 20 b, of Plate XII1. A single specim.en w'ith both valves united has been found presenting the characteristics of the valves just described, and furnishes 1l1y authority for uniting thenl under the sanle species. But as a curialIs Inatter of fact 1110St of the ventral valves have been found at Allen's Q.uarry, and all the dorsal valves at the Soldiers' Home Quarries. 'I'he entire specinlen is smaller in size than Illost of the single valves found.

Surface marked by 60 to 90 fine, radiating striae; the branching is frequent and by intercalations. Concentric strire distant from each other about the space between the radiating striae, or 1110rc, giving some~ times the appearance of quadrangular punctre between the strire; COllcentric strife usually be~t preserved in the spaces between the radiating strire, often not very plain on the strire then1se] ves.