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Aphelakardia alternistriata

Rostroconchia - Conocardiida - Conocardiidae

Taxonomy
Conocardium alternistriatum was named by Herrick (1888) [Type specimens destroyed in fire.]. Its type specimen is OSU 22500.2, a shell, and it is a 3D body fossil. It is the type species of Aphelakardia.

It was recombined as Aphelakardia alternistriata by Hoare (1990) and Wagner (2017).

Synonymy list
YearName and author
1888Conocardium alternistriatum Herrick
1891Conocardium alternistriatum Herrick p. 45 figs. pl. 1 f. 1-4
1952Conocardium alternistriatum Fagadau p. 347
1957Conocardium alternistriatum Szmuc p. 519 figs. pl. 7 f. 22-25
1990Aphelakardia alternistriata Hoare p. 728 figs. 2.11-2.23
2017Aphelakardia alternistriata Wagner p. S2999

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
RankNameAuthor
classRostroconchia
orderConocardiida()
superfamilyConocardioideaMiller 1889
familyConocardiidae
genusAphelakardia
speciesalternistriata()

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.

Diagnosis
ReferenceDiagnosis
R. D. Hoare 1990Distinct body-snout separation marked by change in convexity on lateral and ventral surfaces and change in ornament; posterior face concave laterally; two pronounced longitudinal shelves in snout; omrnament of extemrnal shell layer on body of very fine comarginal lines, appears essentially smooth.

Medium-sized conocardiid (?20 mm long) with distinct body-snout separation; ventral margin with distinct concavity separating body from snout while convexity of lateral surface changes from convex body surface to near flat surface on snout in longitudinal profile; posterior rostral face concave laterally then rising to form base of rostrum medially; length of rostrum unknown; small posterior ventral orifice and dorsal rostral clefts present; anterior gape mainly restricted to dorsal extremity of snout but may extend as narrow opening to posterior end of snout; outer shell layer on body and posterior rostral face smooth except for subdued, very fine, comarginal lines; outer shell layer on snout marked by at least 17 relatively fine radial ribs; intemrnal shell layer omrnament of 11-13 radiating ribs on body, 11 broader radial ribs on snout, up to 16 concentrically arranged ridges on posterior rostral face, which do not extend onto rostrum; ridges on rostral face have an intemrnal structure of fine, equally spaced, cross partitions; margin of posterior rostral face strongly rounded with no prominent radial ribs; intemrnal mold has two prominent grooves starting posterior to umbonal areas, sloping and diverging anteroventrally indicating presence of longitidinal shelves in snout area.