Skenea species

Scanning Electron Micrograph

Skenea species

Sorted from drift taken at 16th Avenue S., Jacksonville Beach, Florida by Norma Bulock in 11/81 (0.68 mm.)

    Scanning electron micrograph performed under the auspices of the Dept. of Invertebrates of the United States National Museum with the excellent technical assistance of Ms. Yolanda Villacampa.

Skenea species

In shell grit taken by SCUBA from a depth of 69 feet off Boynton Beach, FL | David Kirsh image

    Delicate even spiral sculpture, more evident on the base, apparent with high magnification. Operculum of  specimen from Pinellas Co. is thin, corneous, and multispiral. This is Lissospira spec. indet. A (Odé 1987) and may be Ganesa (Lissospira) sp. Gundersen (1998), but Lissospira valvata Dall, 1927 (sensu Redfern, 2001; vidi)  is  a separate species. Juvenile shells of the latter bear an uncanny resemblance to the topical species but have a less excavated umbilicus and lack the shelf-like thickening just within the aperture. As pointed out by W. G. Lyons (in litt., 9/11/91), the systematic position of this taxon may be in the Turbinidae or Tornidae.

    This species is represented in the Lee Collection from Duval, St. Johns, Palm Beach, Monroe, Collier, Lee, Charlotte, Pinellas, and Levy Cos., FL. Lissospira valvata sensu Redfern is there represented  from several islands of the Bahamas, Cozumel (Caribbean Mexico), Honduras, Isla Providencia (off Caribbean Costa Rica), and Antigua. The Pliocene S. smithfieldensis (Olsson, 1916) is similar but appears to have a larger umbilicus.

Gundersen, R., 1998. The seashells of Sanibel and Captiva Islands. Published privately, Racine, Wisconsin. Pp. 1-32.
Odé, H., 1987. Distribution and records of the marine Mollusca in the northwest Gulf of Mexico (A continuing monograph). 23(4): 110-121. July. [Skeneidae, etc.].
Redfern, C., 2001. Bahamian seashells a thousand species from Abaco, Bahamas. Bahamianseashells.com, Inc., Boca Raton, pp. 1-280 + ix + 120 pls.