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Species / Strombus Keatonorum

Strombus Keatonorum

Stromboidea


Original Description of Strombus (Strombus) keatonorum by Petuch, 1994, p. 262:

  • "Shell of average size for genus, broad, somewhat dorsoventrally flattened; spire proportionally low, slightly concave on sides; shoulder rounded, poorly developed, almost nonexistent; body whorl variably sculptured, ranging from heavily-corded (like holotype) to nearly smooth, with corded form being most prevalent; holotype with 30 closely-packed, flattened cords; spire whorls with 7 spiral cords; early whorls and most of penultimate whorl ornamented with 15-20 evenly-spaced, low, undulating knobs; stromboid notch wide, shallow."

Types: Holotype UF66214, Length 77 mm.

Locus typicus: Caloosahatchee Fauna, from Miami Canal Dredging, 12 miles south of Lake Harbor, Palm Beach County, Florida, USA.

Stratum typicum: Caloosahatchee Formation, Lower Pleistocene

Etymology: Named for Dr. and Mrs Kenneth Keaton, Lauderhill, Florida

Strombus keatonorum Petuch, 1994; Holotype; Coll. & Copyright Florida Museum of Natural History UF66214

Comment Petuch, 1994, p. 262:

  • "In almost all recent literature, this distinctive and characteristic Caloosahatchee fossil has been misidentified as "S. alatus" (i.e. Olsson and Harbison, 1953). Although probably ancestral to the living S. alatus, S. keatonorum, is actually much more similar to the older, Pinecrest Beds and Jackson Bluff S. floridanus Mansfield, 1930 (Plate 21, Figure G). the new species differs from its ancestor in being a much larger and more inflated shell, with heavier corded sculpture and heavier and more prominent knobs on the spire whorls."

History and Synonymy

1953

Olsson & Harbison, 1953, p. 273 about Strombus pugilis alatus:

  • "Shell solid, the average size of a full-grown individual about 80 millimeters, with a high, pointed, generally unarmed spire about three-fourths the total length. Immature specimens have a strong sculpture of spiral cords which are quite evenly developed over the entire surface, and in some cases persists throughout life. Spines are typically absent or of erratic occurence only. Shoulder of whorls well-rounded but in shells which have short spines, the shoulder may be angled. Outer lip somewhat expanded, with a wide stromboid notch at base and internally lirate. Shoulder of whorls may bear an occasional heavier rib producing a varix and marking a resting stage. Even quie small shells may have a thickened lip with crenulations on the inner side."
  • THis stromb is represented in the St. Petersburg collection by many specimens and is probably the commonest of the larger mollusks at the locality. The constancy of its distinguishing characteristics at all stages of growth, would seem to indicate that alatus as a Pliocene fossil should be accorded full specific status. The more strongly sculptured shells are generally also more solid, the smoother ones normally thinner. Faint traces of a zig-zag color pattern is retained by some specimens."
  • "St. Petersburg, ANSP 18036, 19091; Fort Thomson, ANSP 17394."

Strombus pugilis alatus in Olsson & Harbison, 1953, pl. 34, fig. 7, 7a


Specimens from institutional collections

Strombus keatonorum Petuch, 1994; Caloosahatchee Fm., Lower Pleistocene; Miami Canal, Florida, USA; 85 mm; 1996; Coll. Stichting Schepsel Schelp, No. SSS28996


Specimens from private collections

Strombus keatonorum Petuch, 1994; Caloosahatchee Fm., Lower Pleistocene; Bergeron-Star Pit Quarry, South Bay, Palm Beach County, Florida, USA; 77 mm; Coll. Ulrich Wieneke

Strombus keatonorum Petuch, 1994; Caloosahatchee Fm., Lower Pleistocene; Bergeron-Star Pit Quarry, South Bay, Palm Beach County, Florida, USA; Coll. Ulrich Wieneke

Strombus keatonorum Petuch, 1994; Caloosahatchee Fm., Lower Pleistocene; Bergeron-Star Pit Quarry, South Bay, Palm Beach County, Florida, USA; Coll. Ulrich Wieneke

Strombus cf. keatonorum Petuch, 1994; Bermont Fm., Middle Pleistocene; Bergeron-Star Pit Quarry, South Bay, Palm Beach County, Florida, USA; Coll. Antoine Heitz, Loc. No. HA 28134

Strombus cf. keatonorum Petuch, 1994; Bermont Fm., Middle Pleistocene; Bergeron-Star Pit Quarry, South Bay, Palm Beach County, Florida, USA; Coll. Antoine Heitz, Loc. No. HA 28134

Strombus keatonorum brantleyi Petuch & Drolshagen 2011; Bermont Fm., Middle Pleistocene; Bergeron-Star Pit Quarry, South Bay, Palm Beach County, Florida, USA; Coll. Antoine Heitz, Loc. No. HA 28134


References

  • Olsson, A. A. & A. Harbison. 1953. Pliocene Mollusca of Southern Florida: With special reference to those from North Saint Petersburg. R.E. Krieger Pub. Co., Huntington, N.Y.
  • Petuch, E.J. 1994. Atlas of Florida fossil shells (Pliocene and Pleistocene marine Gastropods). Department of Geology, Florida Atlantic University and The Graves Museum of Archeology and Natural History, Dania, FL., 394 pp., 100 pls.

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