Museum, research, and collection updates from Dr. José H. Leal, plus Shell of the Week, which highlights a different species every other Friday. Most Shells of the Week are found in Southwest Florida.
Dr. José H. Leal serves as the Bailey-Matthews National Shell Museum & Aquarium’s Science Director and Curator. He received his Ph.D. in Marine Biology and Fisheries from the University of Miami and has served at the Museum since 1996.
Join us for the World Congress of Malacology 2019! The event will take place on August 11–16, 2019, at the Asilomar Conference Grounds, in Pacific Grove, California. This will be a joint meeting of Unitas Malacologica, the American Malacological Society, and the Western Society of Malacologists. Early bird registration, reservation at the Asilomar Conference Grounds, and abstract submission are open, and can be accessed here.
Among the features that hold my attention in a Mediterranean Scallop are the strong, sharp-edged ribs, which are sometimes distinctively squarish in cross-section. They remind me of a corrugated roof, or the core of corrugated cardboard. Corrugated arrangements add great strength to structures, without adding too much weight to them. In a bivalve shell, the corrugations not only add strength, but also help keep the valves aligned and tightly closed, preventing a predator from easily sliding one
The Brown Eulima, Microeulima hemphilli (Dall, 1884), is a slender gastropod of the family Eulimidae. Eulimidae are snails that parasitize the external or internal parts of echinoderms such as sea cucumbers and sea urchins, basically sucking their blood for a living. The Brown Eulima reaches about 5 mm (0.2 inch), and has a teardrop-shaped aperture, and smooth, brownish, slightly translucent shell. The shell in the images was collected by Phyllis Sharp on Sanibel in 2014. The Brown Eulima, Micro
In a bivalve, the half-shells, or valves, are kept together in part by one (or two, depending on the family) adductor muscles. When threatened, the bivalve will clamp its shell shut by quickly contracting the muscles. The areas of muscle attachment on the inside surfaces of an empty shell remain as muscle “scars.” Late last week Collection Associate Jessica Godwin called my attention to one of the scars on a valve of a freshwater mussel known as Washboard, or Megalonaias nervosa (Rafinesque, 18
As suggested recently by a Museum friend, here is a brief comparison between the shells of two local (Southwest Florida) keyhole limpets. The Cayenne Keyhole Limpet, Diodora cayenensis, is on the top row, the Meta Keyhole Limpet, Diodora meta, on the bottom row. The Cayenne may reach about 25 mm (one inch) locally, whereas Meta may grow to be only half as much. Notice, (1) the color, almost completely absent in Meta; (2) the general outline, more “oval” in Cayenne, more elongate in Meta; (3) the
At about 10 mm (about 0.4-inch) the Miniature Lucine, Radiolucina amianta (Dall, 1901), is one of the smallest among many species of the family Lucinidae found along the barrier islands of SW Florida. There are at least 13 lucinid species found on local beaches—the Buttercup Lucine, Anodontia alba, is probably the best known among them. Lucinid clams are known to host chemosynthetic bacteria in their body tissues; these bacteria derive their life energy from simple chemical reactions (in contras
This shell of the bone-eating snail Rubyspira osteovora Johnson et al., 2010 is part of the National Shell Museum collection, catalogue number BMSM 20687. It was retrieved, in March 2009, by Robert Vrijenhoek & Sharon Johnson, both of the Monterey Bay Aquarium Research Institute (MBARI), using their Remotely Operated Vehicle (ROV) Doc Ricketts at the Ruby whale fall, at 2,894 m (about 9,495 ft). It measures about 40 mm, and was donated to the Museum by Robert Vrijenhoek for display in our “Deep
The 2019 Conchologists of America Convention will take place on nearby Captiva Island on June 19–23, with field trips planned for June 17–18. The Convention has as its theme the birth centenary of noted American malacologist and National Shell Museum’s Founding Director, Dr. Robert Tucker Abbott. The Museum will be hosting an open house/reception on July 18 at 6 pm. The reception will be open to all full registrants to the Convention. Click here to download the registration form and get more in
Some mollusks can be highly specialized in their feeding habits. Take, for instance, Rubyspira osteovora Johnson et al., 2010 (photo), a deep-sea gastropod that is found only on or around the skeletons of dead whales. In 2010, Shannon B. Johnson of the Monterey Bay Aquarium Research Institute (MBARI) and her collaborators first named the genus Rubyspira after the nickname of the whale skeleton on which the species was first retrieved, Ruby, combined with spira, Greek and Latin for coil or spira
Just like the Netted Pyram, Peristichia agria Dall, 1889, presented last week in this column, the Tower Pyram, Peristichia toreta Dall, 1889, is a local gastropod of the hyper-diverse family Pyramidellidae. The Tower Pyram shell is slender, elongate, reaching 11 mm (about 0.4 inch) in length. The shell sculpture includes three spiral cords and single smooth, narrow spiral thread just above suture (the groove between two whorls); about 30 narrow axial ribs are present. As with the Netted Pyram, a