Ryssota ovum
species of mollusc
Ryssota ovum, the polished muffin, is a species of large air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helicarionidae. It is endemic to the Philippines, where it is known locally as bayuku or bayoko. It is edible and is considered a delicacy.
Distribution
Ryssota ovum is endemic to the Philippines, mainly in Luzon and in the island of Panay.
Habitat
Ryssota ovum can normally be found underneath forest leaves and branches at the buttresses of tree. This species depends on moisture for survival. So it is abundant during the rainy season, while in the dry season it is present only in damp areas or in cool places.
Description
This species is the largest land snail in the Philippines. Shells of Ryssota ovum can reach a diameter of 70–100 millimetres (2.8–3.9 in). These very large shells vary in color from pale brown to maroon and sometimes they show a brighter apex.
The public source identifies “Ryssota ovum” as species of mollusc. This brief keeps that definition visible, then builds a research path around Ryssota, ovum and species.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jun 23, 2025. The linked authority identifier is Q7385376. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Ryssota ovum” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.