Species Account

Astarte acuticostata Friele, 1877

Crassatelloidea : Astartidae

Tebble name: n/a
Smith & Heppell name: Tridonta acuticostata (Jeffreys, 1869)

To size: To 13mm. Shell Structure: Thin, brittle. Equivalve: Equivalve. Equilateral: Inequilateral, the beaks lie approximately 20% of dorsal margin length from anterior. Tumidity: Moderately tumid. Outline: Subtrigonal, anterior distinctly narrowed, height of shell just over 80% of the height. Posterior dorsal margin long, gently sloping, very slightly convex to almost straight; anterior dorsal margin more steeply sloping and conspicuously concave behind the umbo and then straight to the anterior end; anterior end slightly rounded; posterior end truncated/bluntly rounded; ventral margin almost straight; lunule distinct, slightly sunken, heart-shaped, relatively smooth with well defined, raised edges; escutcheon distinct, lanceolate, with very well defined raised edges. Beaks prosogyrous.

Sculpture: Narrow, fine, concentric ridges, cusped in a ventral direction, usually at least 35 in adult individuals. Margin: Smooth. Ligament: Broad, distinct but not prominently raised, runs for approximately one third the length of the escutcheon. Hinge: Heterodont: Robust hinge plate; right valve with 1 solid, relatively curved anterior cardinal tooth, and 1 thin and inconspicuous posterior tooth; left valve with 1 large blunt cardinal tooth, distinctly bifid such that it appears to be 2 teeth, and 1 thin and inconspicuous posterior tooth; the anterior part of the left valve has a long thickened ridge similar to a lateral tooth. Pallial Musculature: Entire. Periostracum: Ranges from yellowy gray to grayish brown. Silky surface texture, microscopically punctate. Colour: White.

Distribution & Ecology

Recorded from the continental slope off northern and northwestern coasts of Britain and Ireland.

Lives in silty sands on the upper and middle slope, in depths ranging from 400 to 900m.

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

Additional Information & Related Species

Additional Comments

Jensen (1912) and Ockelmann (1958) regard this taxon as a subspecies of A. crenata. The closely spaced ribs and un-wrinkled periostracum we find distinct and retain this as a good species.

Related Species


Listed are literature citing Astarte acuticostata Friele, 1877. Reference containing the species Type Description is highlighted.

Friele H 1877. Preliminary report on Mollusca from the Norwegian North Atlantic Expedition in 1876. Nyt Mag. naturvid. 23: 1-10.
Høpner Petersen G. 2001. Studies on some Arctic and Baltic Astarte species (Bivalvia, Mollusca). Bioscience. 52: 1-71.


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Record last modified: 17/05/2016