Fissurellidae, common name the keyhole limpets and slit limpets, is a taxonomic family of small to medium-sized limpet-like sea snails, marine gastropod molluscs in the clade Vetigastropoda. [2] [3] Their common name derives from the small hole in the apex of their cone-like shells.

Megathura crenulata is a northeastern Pacific Ocean species of limpet in the family Fissurellidae [1] known commonly as the great keyhole limpet [2] or giant keyhole limpet. [3] Megathura is a monotypic genus; in other words, this is the only species in that genus.

Called a radula, this rasping tongue is the world's strongest biological structure - it has to be to constantly scrape sponges off tough rocks without wearing away. Their shell is oval and conical, with a distinctive hole at the tip that gives them their name.

Diodora cayenensis, the Cayenne keyhole limpet, is a species of small to medium-sized sea snail or limpet, a western Atlantic marine prosobranch gastropod mollusk in the family Fissurellidae, the keyhole limpets.

Mar 22, 2019 · Reaching about 125 mm (about 5 inches), the Giant Keyhole Limpet, Megathura crenulata G.B. Sowerby I, 1825, is one of the behemoths of the limpet universe. A herbivore gastropod, this unusual mollusk stands out not only because of its size, but also because its mantle can extend out, completely enveloping the shell.

Limpets are a type of aquatic snail with a cone-shaped shell. The shell of the giant keyhole limpet is covered by a black to mottled gray mantle with a single, central hole at the top. As implied by its genus name (Mega), it is one of the largest keyhole limpets with a shell length of up to 13 centimeters wide. Habitat & Behavior

Jan 3, 2025 · Distinguishing Characteristics: The True Limpets have a simple flattened conical shell without whorls or spire. Habitat: These snails prefer intertidal rocky shores. Diet: This order grazes on algae that grows on rocks.

Dec 28, 2018 · The Rosy Keyhole Limpet, Fissurella rosea (Gmelin, 1791), is one of the most common species of keyhole limpets in the western Atlantic and Caribbean region. This species, however, is only very rarely found on our barrier islands.

Description: This keyhole limpet has a large brown, red, orange, or yellow mantle which covers so much of the shell that the animal looks very much like a nudibranch at first.

Dec 5, 2024 · The keyhole limpet is a giant aquatic snail (gastropod) with a cone-shaped shell (shell length can be 13 centimeters). [Its name derives from the tiny hole at the tip of its shell.] The keyhole limpet is non-edible and resides in the Pacific coastal waters off California and Mexico.