Terebratalia transversa (Sowerby, 1846)
|Terebratalia transversa photo taken at Rosario Marine Station|
|Photo by: Anna Dyer, 08/02/02|
How to Distinguish from Similar Species: Distinguished by location, color, and that it is broader than long.
Geographical Range: Alaska to Baja California.
Depth Range: It is found in the low intertidal zone but is more commonly subtidal to at least a depth of 1,800 m in clean, quiet water.
Habitat: This species is scarce, but when found, is usually attached to undersides or protected surfaces of large rocks.
Biology/Natural History: The animal
is solitary. When it reproduces, the fertilized eggs develop into
a characteristic, but nameless, larva. The larva does not feed and
is planktonic. The larva attaches and then develops into an adult.
The main predators of this species appear to be crabs, which chip off parts
of the margin of the shell to reach the soft part. The lampshell
may survive these attacks and many show asymmetrical shell growth from
repairs that have been made.
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Kozloff ,1987, 1996
Morris et al., 1980
This species is often encrusted with coralline algae. Photo by Dave Cowles, July 2000
This individual has unusually pronounced growth lines. Shell found dead at 12 m depth near many live individuals off the Cone Islands by Jim Ramaglia, and provided by Andrew Rice.
Photo by Dave Cowles, July 2005.
This photo shows the hinge articulation. The two valves are interlocking so that they cannot be opened more than in the picture without breaking.
Photo by Dave Cowles