Pecten humphreysii humpreysii Conrad, 1842
CONRAD, T. A. 1842. Observations on a portion of the Atlantic Tertiary region, with a description of new species of organic remains. Bulletin of the Proceedings of the National Institute for the Promotion of Science, 2: 171–194 [p. 194, pl. 2, fig. 2]
1842 Pecten humphreysii Conrad, 1842
T. A. Conrad, 1842, plate 2.
|
«Pecten Humphreysii, pl. 2, fig. 2. Suborbicular, inferior valve convex; superior flat, and with about seven remote, narrow, convex ribs, and concentrically wrinkled; towards the apex is a concave depression; ears equal, sides direct and straiglit; inferior valve with the ribs wide, approximate, plano-convex and longitudinally striated; one of the ears emarginate at base.
Localities: Near Fairhaven, Anne Arundel county, Md. Mr. Wilkinson's farm, in Calvert county. I am indebted to Dr. Humphreys, of Annapolis, for the loan of the specimen figured, that which I found at Fairhaven being too imperfect for the purpose. I gladly attach the name of this gentleman to the species, in consideration of his love of and proficiency in scientific pursuits. Of two specimens in the collection of the college at Annapolis, the largest measures three inches from beak to base.» TIMOTHY ABBOT CONRAD, 1842
|
«Recent American species (e.g., the Eastern Pacific "Pecten" vogdesi Arnold, 1906, and "P." diegensis Dall , 1898, and the Western Atlantic "P." raveneli Dall, 1898, Euvola ziczac (Linnaeus, 1758), E. laurenti (Gmelin, 1791), and "Amusium papyraceum"), as well as American fossil species have two or three enlarged riblets on the exterior of each left auricle , these being limited to the dorsal half of the auricle. An important exception is Pecten humphreysi Conrad, 1842, from the early Miocene of the middle Atlantic Coastal Plain of the United States. Both the auricular ornamentation and hinge dentition of this species (see illustrations in Gibson, 1987) are like European and Indo-West Pacific Pecten , which have left auricles with evenly distributed riblets of equal strength or without any riblets at all.
(...) The Miocene specie s found in eastern North America, Pecten humphreysi, was yet another branch of the Pecten clade . It probably reached the western Atlantic region via a transAtlantic route (rather than a trans-Pacific route as suggested by Fleming (1957b)), but its presence in eastern North America was apparently short lived, because no later representatives of true Pecten are known on either side of the Americas.» WALLER, T. R. 1991. Evolutionary relationships among commercial scallops (Mollusca: Bivalvia: Pectinidae). In: Shumway S. E. (ed.), Scallops: biology, ecology and aquaculture. Developments in Aquaculture and Fisheries Science, Elsevier, Amsterdam, 21: 1-73. [p. 38, 39]
|
Pecten humphreysii humphreysii Conrad; T. G. Gibson, 1987, Miocene and Pliocene Pectinidae from the Lee Creek Mine, plate 4, figures 1-8.
|