Diodora Aspera
''Diodora aspera'', also known as the rough keyhole limpet, is a species of sea snail, a marine gastropod mollusk in the family (biology), family Fissurellidae, the keyhole limpets. Although similar in appearance to a common limpet, it has a hole near the apex of its shell, and is only distantly related. It often has a scaled polychaete worm ''Arctonoe vittata'' living inside its shell as a Commensalism, commensal. In the event that it is attacked by a starfish, it extends flaps of Mantle (mollusc), mantle to defend itself, and the worm also helps drive the predator away. Description ''Diodora aspera'' has a cone-shaped shell growing to a length of about . Near the apex is an aperture about one tenth of the length of the shell, which is used for respiration and the elimination of waste. There is a broad foot which exerts suction on the rock surface, and the mantle is large enough to cover the margin of the shell. The surface of the shell is sculptured with coarse ribs and is usua ...
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Martin Rathke
Martin Heinrich Rathke (25 August 1793, Danzig – 3 September 1860, Königsberg) was a German embryologist and anatomist. Along with Karl Ernst von Baer and Christian Heinrich Pander, he is recognized as one of the founders of modern embryology.Martin Heinrich Rathke
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Who Named It

He was the father of Bernhard Rathke (1840–1923). He studied medicine and natural history at the