|Description||Euspira lewisii, moon snail fossil dating from between 1.5 million years ago to .75 million years ago commonly found at low tide in littoral (sandy and muddy bottom) or sub-littoral (open bay, muddy marine) zones. Fossil specimen is snail-shaped, with distinct swirls visible at top of shell. Shell is mostly white, with contrasting patches of varying shades of beige and darker gray sediment. Underside surface is mostly white, with grayish beige colored sediment exposed.|
|Object Name||Shell, Animal|
|Collection||3D - Paleontology|
|Title||Euspira lewisii, Moon Snail Fossil, 1.5 - .75 Ma|
|Date||1.5 - .75 Ma|
|Class||Gastropoda (Snails, limpets)|
|Family||Naticidae (Moon snails)|
|Provenance||Fossils taken from Merced Formation collected at Westborough Boulevard at Highway 280 in the late 1970s or early 1980s. (See Yancey 1978, Fig. 2: Artifacts taken from E Stratified Section/D-5929). Most specimens (especially clams) in this collection are not extinct and can still be found in the Bay Area.|
Retired Geologist Ken Lajoie identified on 4/24/2014.
A moon snail feeds upon other snails and bivalves. They wrap their large foot around their prey, making it impossible for its victim to breathe. Moon snails can also drill holes in prey. They soften the shells of clams by secreting acid, and then they drill a hole through the clam using a mouth part called a radula. Once the hole is drilled, they scrape out and eat the clam meat, leaving the rest of the shell intact.
|Dimensions||H-1.5 W-2 D-1.75 inches|
South San Francisco