Ilyanassa trivittata
A cancellate mud snail with three rufous lines on the body whorl.
Last updated
Naturalis Biodiversity Center · via Wikipedia: Ilyanassa trivittata · CC0
Ilyanassa trivittata, commonly known as the threeline mud snail, is a species of sea snail in the family Nassariidae. This marine gastropod mollusk is notable for its distinctive shell ornamentation and its occurrence in the Northwest Atlantic Ocean.
Scientific classification
- KingdomAnimalia
- PhylumMollusca
- ClassGastropoda
- SubclassCaenogastropoda
- OrderNeogastropoda
- FamilyNassariidae
- GenusIlyanassa
- SpeciesIlyanassa trivittata
Named by (Say, 1822)
Close relatives
Other species of Ilyanassa with a Codexery entry.
- Ilyanassa obsoleta Ilyanassa obsoleta
Sources: Wikipedia taxobox: Ilyanassa trivittata (CC BY-SA 4.0) · order, family and genus agree with WoRMS AphiaID 467492 (CC BY 4.0)
Where the ilyanassa trivittata has been recorded
Each dot is a place where the species has been observed and reported (3,902 records, half-degree grid) — not a modelled range. 61 inland records left out (institution coordinates).
Map: drawn by Codexery. Data: GBIF occurrence search (records CC0 / CC BY) · Natural Earth basemap (public domain) · place coordinates: Wikipedia (CC BY-SA 4.0)
Quick Facts
- Family
- Nassariidae
- Common name
- threeline mud snail
- Shell color
- yellowish-white
- Body whorl lines
- three rufous lines
- Distribution
- Northwest Atlantic Ocean off Canada (Gulf of Saint Lawrence, Bay of Fundy)
Facts from the source article.
Background
The shell of Ilyanassa trivittata is conic and acute, appearing yellowish-white. It is cancellate, giving it a granulated appearance with prominent, equidistant granules. Ten revolving impressed lines are present on the body whorl, along with a more conspicuous groove near the summit of each whorl. The spire is as long as or longer than the body, featuring a rufous revolving line near the suture.
The body whorl is trilineate with rufous lines: one near the suture, one on the middle, and a third, rather darker, at the origin of the beak. The suture is regular and deeply impressed, and the beak is distinguished by a profound depression from the body whorl and is slightly reflected. The outer lip is not incrassated but has raised lines within upon the fauces that do not extend quite to the edge of the lip. The inner lip is distinctly lamellar, with an obsolete fold of the basal edge and a tooth near the superior junction with the outer lip.
More in Marine Snails: Ceriths, Nassas and Conchs
Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Ilyanassa trivittata (CC BY-SA 4.0).
- Classification: the source article's taxobox; order, family and genus checked against WoRMS, the World Register of Marine Species (CC BY 4.0).
- Occurrence records: GBIF (CC0 / CC BY). Basemap: Natural Earth (public domain).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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