Heteranomia squamula (Linnaeus, 1758)
Anomioidea : Anomiidae |
| Tebble name: | Heteranomia squamula (Linnaeus) |
| Smith & Heppell name: | Heteranomia squamula (L., 1758) |
To size: To 15 mm. Shell Structure: Upper valve thin but robust, lower valve thinner often hyaline. Equivalve: Inequivalve, upper (left) valve convex; lower (right valve) flat. Equilateral: Inequilateral, beaks close to the middle of the dorsal margin. Outline: Upper subcircular but often very irregular and taking outline of substrate; lower valve similar with an oval byssus foramen. Contour: Often deformed to fit shape of attachment area.
Sculpture: Upper valve surface variable from almost smooth with concentric lines to bearing fluted spines; lower valve with comarginal lines and growth stops. Margin: Irregular but smooth. Ligament: In a half moon shaped pit beneath the beaks. Hinge: Obscure. Pallial Musculature: Upper valve with two scars the dorsal (byssus retrator) larger and joined with the smaller single adductor scar. Scars without faint radiating furrows. Lower valve with a single faint adductor scar. Periostracum: Obscure. Colour: Both valves white often semitransparent. Additional Characters: Anatomy: Ctendium with non-reflected filaments.
Distribution & Ecology
Depth Range
Intertidal
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
References
Resources
Image Gallery
