Cincinnatian Species: Philhedra laelia (Hall)
Formerly: Crania laelia (Hall)
Map point data provided by iDigBio.
- C6 sequence (Elkhorn, Whitewater)
- C5 sequence (Whitewater, Liberty, Waynesville)
- C4 sequence (Arnheim)
- C3 sequence (Mount Auburn, Corryville)
- C2 sequence (Bellevue, Fairview: Fairmount Member, Mount Hope Member)
Identification in Hand Sample
- Small, subrounded shells
- Radiating costellae, as well as concentric growth lines
- Costellae sharply elevated
Philhedra laelia from the Liberty formation of Preble County, Ohio (MUGM 26219)
Holland (UGA Strat Lab, 2013):
- Subrounded shells with subcentral apex and radiating costellae (occurrence: Mount Hope, Fairmont, Bellevue, Corryville, Mount Auburn, Arnheim, Waynesville, Liberty, Whitewater, Elkhorn)
- Shell small, inequivalve, oval in outline, with width greater than length. Dorsal valve highly convex; beack elevated, pointed, situated nearly in the middle of the shell. Surface marked by concentric lines of growth as well as radial striations. The latter vary considerably in number and strength. This shell…is usually found attached to an orthid or Rafinesquina. In no case was the Crania marked like the surface of the host.
Hall & Whitfield (1875):
- Under Crania laelia
- Shell small, discoid, or moderately convex on the upper valve; outline circular, or a little narrowed toward the cardinal border. Apex of the dorsal valve minute, not prominent, varying from sub-central to about one-third the length of the valve from the cardinal margin. Surface of the dorsal valve marked by fine but sharply elevated , radiating striae, which are sometimes tortuous, and frequently increased by implantation. Ventral valve and interior of the shell not observed. This is a distinct and well-marked species, not readily mistaken for any other from rocks of this formation, although there are forms known in higher positions that resemble it somewhat. Its nearest described analogue is C. crenistria, Hall, from the Hamilton group of New York; but the striae are sharper and the apex more appressed.