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Species / Alarimella Anae


Original description of Alarimella anae by Saul, 1998:

  • "Shell small, high spired with pleural angle of about 31; whorl profile on spire slightly convex becoming almost subangulate on ultimate whorl; strong randomly distributed varices present on spire; suture impressed; rostrum apparently short and straight; outer lip expanded into two parts: a posterior short thin spike adjacent at its base to the spire and a larger, carinate, short but broad wing extending laterally; sinus in outer lip margin adjacent to the rostrum; inner lip thin. Sculpture of spire dominated by rounded arcuate axial ribs extending from suture to base, about 16 on penultimate whorl, axial ribs disappearing on back of ultimate whorl and replaced by fine sigmoid axial lines near outer lip that extend onto rostral neck; entire shell surface covered by fine, spaced spiral cordlets."

Locus typicus: CIT (California Institute of Technology), loc. 1065, about 0.97 km north of confluence of Ladd and Silverado Canyons, Black Star Canyon quadrangle, Santa Ana Mts., Orange County, California, USA.

Stratum typicum: Baker Canyon Sandstone Member of the Ladd Formation, late Turonian, upper Cretaceous

Type specimens: Holotype, LACMIP (Natural History Museum of Los Angeles County, Invertebrate Paleontology) no. 11410; Paratypes LACMIP no. 11411 to 11414 all from California Institute of Technology (CIT), loc. 1065.

Geographic distribution: Known only from the type locality west of Ladd Canyon, Santa Ana Mountains, Orange County, California, USA in the Baker Canyon Sandstone Member of the Ladd Formation

Alarimella anae Saul, 1998; Holotype; LACMIP no. 11410; Copyright Bailey-Matthews Shell Museum - The Nautilus


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