Argopecten caucanus (F. & H. Hodson, 1927)
HODSON, F., H. K. HODSON & G. D. HARRIS. 1927. Some Venezuelan and Caribbean mollusks. Bulletins of American Paleontology, 13 (49): 1-80, pls. 1-40. [p. 27, pl. 15, figs. 1, 8]
1927 Pecten circularis caucanus F. & H. Hodson, 1927
F. Hodson, H. K. Hodson &
D. Harris, 1927, plate 15. |
«This subspecies is distinguished only in adult forms and is characterized by the radial striation of the ribs. The ribs typically have sloping sides as in the species, sensu stricto, but many specimens have been noted which have rather square ribs which are becoming distinctly striate. The number of striae on a rib is very variable, but usually there is a strong stria, which may be almost a supplementary riblet, at the base of each rib, with 1-4 smaller striae between the crest of the rib and the strong, basal, radial thread. Between the strong radial threads at the base of adjacent ribs, there is a deeply incised, channeled, radial sulcus.
The striation is never present on the younger shells, which cannot be told from young shells of either of our other two subspecies. Age: Pliocene. Locality: District of Democracia, State of Falcón, locality number 69». FLOYD HODSON, HELEN K. HODSON & GILBERT DENNISON HARRIS, 1927
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