Species Account

Adontorhina keegani Barry & McCormack, 2007

Thyasiroidea : Thyasiridae

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

To size: To 2.0mm. Shell Structure: Shell fragile, translucent. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just behind the midline. Tumidity: Inflated. Outline: Subovate, expanded anteriorly, distinctly longer than high; anterior dorsal margin initially horizontal then angled to short often truncated outer anterior dorsal margin; anterior broadly rounded; ventral margin long, gently curved; posterior subacute with ventral part weakly truncated and distinct from ventral margin; posterior dorsal margin straight or slightly angled. Contour: Umbo prominent; Lunule area small, flattened; submarginal sulcus shallow, weakly defined, auricle very low.

Sculpture: Of weak concentric lines and growth stops. Microscopically radially striated within the shell structure. Margin: Inner margin smooth. Ligament: On a sunken resilifer extending to about half the length of the posterior dorsal margin. Hinge: Weak, a minute cardinal protuberance in RV and corresponding depression in LV; Margin under lunule thickened and minutely denticulate, denticulations also along posterior dorsal margin. Pallial Musculature: Muscle scars obscure. Periostracum: Thin, obsolete. Colour: Shell white. Additional Characters: 1 demibranch. Almost all live collected specimens have had an epifaunal (hydroid) growth over the surface of the shell and extending in finger like processes from the posterior.

Distribution & Ecology

Known only from Porcupine Bank, West of Ireland in muddy sand either side of the highest point at 300-789m.

Depth Range
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)

Additional Information & Related Species

Juvenile Description

As adult.

Key Features & Similar Species

Very similar to A. similis but that species lacks the radial striations and the posterior does not have a truncated lower region. A. similis has never been recorded with an epifaunal growth as in A. keegani.

Related Species


Listed are literature citing Adontorhina keegani Barry & McCormack, 2007. Reference containing the species Type Description is highlighted.

Barry P J & McCormack G P 2007. Two new species of Adontorhina Berry, 1947 (Bivalvia: Thyasiridae) from the Porcupine Bank, off the west coast of Ireland. Zootaxa. 1526: 37-49.


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Record last modified: 15/01/2014