Species Account

Tiostrea chilensis (Philippi, 1845)

Ostreoidea : Ostreidae

Tebble name: n/a
Smith & Heppell name: n/a

Notes on Nomenclature

Not included in CLEMAM. In WoRMS as Ostrea chilensis. Beu (2006) use isotopes and claim that Tiostrea is synonymous with Ostrea. However Chanley & Dinamani (1980) created Tiostrea because the larvae are very different to Ostrea, almost Gryphaeidae-like.

To size: To 80mm. Shell Structure: Solid but not heavy. Equivalve: Inequivalve, cemented valve cupped, upper valve flat or weakly convex. Equilateral: Inequilateral. Outline: Suboval to subcircular, margins of lower valve irregularly fluted, upper valve less so.

Sculpture: Upper valve foliaceous with underlying radial ribs; lower valve with radiating ribs in a disrupted pattern. Margin: Chomata mostly absent, some with a few ostreiine chomata close to the ligament. Ligament: Amphidetic, internal on a triangular resilifer. Pallial Musculature: Adductor scar kidney shaped, colour as underlying shell. Colour: Upper valve tan becoming black with paler radiating rays; lower valve paler overall. Internally creamy to yellowish with a darker marginal band.

Distribution & Ecology

Introduced from New Zealand into the Menai Straits, North Wales where it is established and breeding. Direct larval development has resulted in limited spread and remains restricted to a small area on the Anglesey side. Intertidal.

Depth Range

Additional Information & Related Species

Key Features & Similar Species

The shape is most similar to O. edulis but the black colour is distinctive.

Related Species


Listed are literature citing Tiostrea chilensis (Philippi, 1845). Reference containing the species Type Description is highlighted.

Beu A.G. 2006. Marine Mollusca of oxygen isotope stages of the last 2 million years in New Zealand. Part 2. Biostratigraphically useful and new Pliocene to recent bivalves.. Journal of the ROyal Society of New Zealand. 36 (4): 151-338.
Buroker N E, Chanley P, Cranfield H J & Dinamani P 1983. Systematic status of two oyster populations of the genus Tiostrea from New Zealand and Peru. Marine Biology. 77: 191-200.
Chanley P & Dinamani P 1980. Comparative descriptions of some oyster larvae fromNew Zealand and Chile, and a description of a new genus of oyster, Tiostrea.. New Zealand Journal of Marine and Freshwater Research. 14(2): 103-120.
Philippi R A 1845. Diagnosen einiger neuen Conchylien. Archiv fur Naturgeschichte. 11: 50-71.


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Record last modified: 22/06/2016