Bathyspinula subexcisa (Dautzenberg & Fischer, 1897)
Nuculanoidea : Bathyspinulidae
Equilateral, beaks located at, or slightly anterior of midline.
Oval with a pointed rostrum: antero-dorsal and postero-dorsal margins relatively short, almost horizontal, or only sloping very gently; anterior and ventral margins deeply rounded; posterior end concave; rostrum well defined and sharply pointed. Umbo relatively narrow, rounded, prominent above the dorsal margin.
Sculpture: Sculpture of numerous, relatively evenly spaced, sharply incised lines. Margin: Smooth. Ligament: Amphidetic, internal part, rounded and relatively large, and seated in a resilium but without a projecting chondrophore; external part long and relatively prominent anteriorly, shorter and less prominent posteriorly, visible from lateral view. Hinge: Taxodont. Solid, v-shaped, narrow near the umbo and broadening towards each end, with long, roundly pointed chevron-shaped teeth, up to 12 anterior and 9-10 posterior. The teeth are positioned towards the bottom side of the hinge plate. Periostracum: Glossy, iridescent, translucent white. Colour: White. Additional Characters: The hind-gut forms a series of rounded coils on the right side of the body.
Distribution & Ecology
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Abyssal Plain (4000m +)
Additional Information & Related Species
Nuculanoidea : Bathyspinulidae
Listed are literature citing Bathyspinula subexcisa (Dautzenberg & Fischer, 1897). Reference containing the species Type Description is highlighted.
Coan E.V. & Scott P.H. 1997. Checklist of the Marine Bivalves of the Northeastern Pacific Ocean. Santa Barbara Museum of Natural History. 1-28:
Dautzenberg P & Fischer H 1897. Dragages effectués par l'Hirondelle et par la Princesse Alice 1888-1896. Gastropodes et Pélécypodes. Mémoires de la Société Zoologique de France. 10: 139-234, pls 3-7.
Olabarria C. 2005. Patterns of bathymetric zonation of bivalves in the Porcupine Sea Bight and adjacent abyssal plain, NE Atlantic. Deep-Sea Research I. 52: 15-31.
Sanders H L & Allen J A 1982. Studies on deep-sea Protobranchia (Bivalvia); the subfamily Spinulinae (Family Nuculanidae). Bulletin of the Museum of Comparative Zoology, Harvard. 150: 1-30.
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