Theora lubrica Gould, 1861
Tellinoidea : Semelidae
To size: To 15mm. Shell Structure: Thin, fragile, brittle at margins. Equivalve: Equivalve. Equilateral: Inequilateral, beaks to the anterior (although smaller specimens are more equilateral). Tumidity: Moderately swollen. Outline: Elongate ovate.
Sculpture: Smooth, fine growth stops. Margin: Smooth. Ligament: Internal on a moon-shaped chondrophore. External part is a short, brown arched band. Hinge: LV one small cardinal and single weak laterals; RV two cardinals and single laterals. Pallial Musculature: Pallial sinus deep, to between beak and anterior adductor muscle. Colour: Cream to white. Additional Characters: Interior, anterior oblique rib in both valves.
Distribution & Ecology
A non-native species in Australia, New Zealand and the Pacific coast of USA. Has also spread to the Mediterranean, western Spain, Netherlands and now reported in the UK (Worsfold et al, 2020). In the UK reported from Lowestoft, Suffolk and Grantham harbour, Scotland.
Additional Information & Related Species
Tellinoidea : Semelidae
Listed are literature citing Theora lubrica Gould, 1861. Reference containing the species Type Description is highlighted.
Aderraga I. & Martínez J. 2011. First record of invasive THeora lubrica (Mollusca: Bivalvia: Semelidae) in the Atlantic Ocean. Marine Biodiversity Records. 4:
Faase M., Gheerardyn H., Morys C., Van Haaren T., Ysebaert T. & Nuland R. 2019. The non-indigenous window shell THeora lubrica Gould, 1861 (Bivalvia: Cardiida: Semelidae) in the delta area of the Netherlands. Basteria. 83(1-3):
Gould A.A. 1861. Description of new shells collected by the United States North Pacific Exploring Expedition. Proceedings of the Boston Society of Natural History. 8: 14-32.
Worsfold T.M., Pennisi N. & Ashelby C.W. 2020. Theora lubrica Gould, 1861 (Bivalvia: Semelidae), new to the U.K. with notes on associated non-native species and an earlier date of introduction for Arcuatula senhousia (Bivalvia: Mytilidae) to the U.K.. Journal of Conchology. 43(6): 665-674.
- Conchological Society
of Great Britain & Ireland
Provides resources for understanding, identifying, recording, and conserving molluscs
Check List of European Marine Mollusca
The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
- NBN Gateway
National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
- Malacological Society
- Unitas Malacologica
- Census of Marine Life
MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.