Species Account

Abra longicallus (Scacchi, 1835)

Tellinoidea : Semelidae

Tebble name: Abra longicallus (Scacchi)
Smith & Heppell name: Abra longicallus (Scacchi, 1834)

To size: To 19mm. Shell Structure: Thin, brittle. Equivalve: Almost equivalve. Equilateral: Inequilateral, beaks to the posterior. Tumidity: Not tumid. Outline: Ovate, posterior dorsal margin almost straight sloping to a narrowly rounded posterior margin, anterior dorsal margin almost straight sloping to a broadly rounded anterior margin.

Sculpture: Concentric lines and faint radial lines. Growth stages clear. Margin: Smooth. Ligament: External small brown, arched band, internal ligament in a small elongated, triangular chondrophore. Hinge: LV one small cardinal and single weak laterals; RV two cardinals and single laterals. Pallial Musculature: Deep pallial sinus, confluent with pallial line for two thirds of its length. Cruciform muscle scars visible in some specimens. Periostracum: Brown. Colour: Creamy white.

Distribution & Ecology

On the continental margin and upper slope from c.200-1000m. In oceanic muddy sand, low amounts of organic carbon.

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

Additional Information & Related Species


Listed are literature citing Abra longicallus (Scacchi, 1835). Reference containing the species Type Description is highlighted.

Scacchi A 1835. Notizie intorno alle conchiglie ed a’zoofiti fossili che si trouvano nelle vicinanze Gravina in Puglia. Annali Civili del Regno delle Due Sicilie. 6: 75-84.


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Record last modified: 22/03/2016