Species Account

Ensis magnus (Schumacher, 1817)

Solenoidea : Pharidae

Tebble name: Ensis arcuatus (Jeffreys)
Smith & Heppell name: Ensis arcuatus (Jeffreys, 1865)

Notes on Nomenclature

Here previously as Ensis arcuatus.

To size: To 150mm. Shell Structure: Brittle. Equivalve: Equivalve. Equilateral: Inequilateral, beaks at the anterior end. Tumidity: Slender. Outline: Ensiform, dorsal margin almost straight, ventral margin slightly curved. Anterior and posterior truncate. Posterior gape narrow, lozenge shaped in cross section.

Sculpture: Smooth with very fine co-marginal lines. Margin: Inner margin smooth. Ligament: External, a long narrow brown/black band behind the beaks. Hinge: LV with two rather bulbous cardinals and two laminar posterior laterals, one lying above the other; RV with a single laminar cardinal and a single posterior lateral. Pallial Musculature: Pallial sinus U-shaped, separation of posterior adductor scar and pallial sinus equal to or slightly more than length of adductor scar. Anterior adductor scar exceeding length of ligament; pedal retractor muscle posterior to end of ligament. Periostracum: Greenish brown becoming darker at the margins. Colour: Dirty white, cream, grayish some banded reddish brown.

Distribution & Ecology

A burrower into sand to sandy gravels. From the low intertidal and nearshore shelf, widespread.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species


Listed are literature citing Ensis magnus (Schumacher, 1817). Reference containing the species Type Description is highlighted.

Holme N A 1951. The identification of British species of the genus Ensis Schumacher (Lamellibranchiata). Journal of the Marine Biological Association of the United Kingdom. 29: 639-647.
Holme N A 1954. The ecology of British species of Ensis. Journal of the Marine Biological Association of the United Kingdom. 33: 145-172.
Schumacher C F 1817. Essai d’un nouveau système des habitations des vers testacés Scultz, Copenhagen. 288pp, 22pls.


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Record last modified: 22/03/2016