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Opalia montereyensis

(Monterey Wentletrap)


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Common Names

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Common Names in English:

Monterey Wentletrap, Wentletrap


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Physical Description

Species Opalia montereyensis

A close relative, O. chacei, also known as O. wroblewskyi, is only differentiated from O. montereyensis by the number of axial ribs. The chacei species usually has 7 ribs , while O. montereyensis has 8-10 axial ribs. O. chacei has a shell up to 30 mm high with the base delimited by a low spiral cord or keel. The axial ribs are broadly rounded . The shell color is white or cream.[1]


O. chacei is uncommon under rocks, however, it is associated with anemones. Depth Range : O. chacei is found in the low intertidal and subtidal zones.[1]


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O. chacei is probably a specialized predator on sea anemones, like Epitonium tinctum.[1]


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Name Status: Accepted Name .

First described: Dallman In: J. Bot.. 45. 142, 1907.

Last scrutiny: 17-Oct-2001

Similar Species

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Members of the genus Opalia

ZipcodeZoo has pages for 12 species and subspecies in this genus:

O. aurifila (Fine-Mesh Wentletrap) · O. borealis (Boreal Wentletrap) · O. crenata (Coarse Wentletrap) · O. eolis (Cancellate Wentletrap) · O. funiculata (Scalloped Wentletrap) · O. hotessieriana (Pitted Wentletrap) · O. infrequens (Sparse Wentletrap) · O. montereyensis (Monterey Wentletrap) · O. pumilio (Dwarf Wentletrap) · O. pumilio pumilio (Dwarf Wentletrap) · O. spongiosa (Spongy Wentletrap) · O. wroblewskii (Wroblewski's Wentletrap)

More Info

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Further Reading

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Data Sources

Accessed through GBIF Data Portal February 28, 2008:



  1. Cowles, Dave. Key to Invertebrates Found At or Near The Rosario Beach Marine Laboratory (a campus of Walla Walla University) Fidalgo Island, Anacortes, WA May 2009. [back]
Last Revised: 2014-10-16