Patera appressa (Say, 1821) Flat Bladetooth

Note the difference in dorsal sculpture between specimens A1-2 and B1-2. A1-2 (17.3 mm.) and B1-2 (16.9 mm.).

Patera appressa (Say, 1821) Flat Bladetooth

Patera appressa (Say, 1821) Flat Bladetooth

Flynn Creek Crater west of Antioch Church, Jackson County, Tennessee, 4/27/2021. Collected by Bob Winters.
A1 and A2: Patera appressa (Say, 1821); B1 and B2: Patera linguifera (Lamarck, 1822) Tongue Bladetooth. These specimens were among some thirty empty shells in roughly equal numbers collected in a 50 mē area. No evidence on intergradation was found. Despite being treated as a mere form of the former taxon by authors, it appears the Lamarckian taxon is a distinct morphospecies; this station is 200 km from its type locality, Knoxville.

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