Species Account

Microgloma tumidula (Monterosato, 1880)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Microgloma turnerae Sanders & Allen, 1973

Notes on Nomenclature

Nuculanidae in place of Yoldiidae
Killeen & Turner (2009) use Nuculanidae instead of Yoldiidae in agreement with Ockelmann & Warén (1998) who explan that the distinguishing characters between these two families has never been well documented. Until the Yoldiidae can be clearly distinguished from the Nuculanidae we shall treat them under the single family Nuculanidae.

To size: 1-1.2 mm. Shell Structure: Minute, relatively solid. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks situated to the posterior of midline, approximately 40-45% of total length from posterior end. Tumidity: Tumid. Outline: Oval, anteriorly extended; height of shell approximately 80% of the length; dorsal margin straight, very short posteriorly, longer anteriorly; posterior margin gently rounded, anterior margin extended and more strongly rounded; ventral margin rounded, lunule and escutcheon absent; umbo not prominent, projecting slightly above the dorsal margin, prodissoconch conspicuous.

Sculpture: Very fine, regular concentric lines, increasing in prominence towards the ventral margin; also very faint radial lines. Margin: Smooth. Ligament: Internal, amphidetic, oval, sat in a simple resilifer below the beaks. Hinge: Taxodont: hinge relatively strong with 3 large, blunt, chevron-shaped teeth either side of the ligament. Pallial Musculature: Indistinct. Periostracum: Glossy, very pale straw coloured. Colour: Translucent white. Additional Characters: Elongated coils along the dorsum on both sides of the body.

Distribution & Ecology

Mediterranean, southern Portugal, Bay of Biscay in depths from 200 to >2000m

Depth Range
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)

Additional Information & Related Species


Listed are literature citing Microgloma tumidula (Monterosato, 1880). Reference containing the species Type Description is highlighted.

Ockelmann K & Warén A 1998. Taxonomy of and biological notes on the bivalve genus Microgloma with comments on Protobranch nomenclature. Ophelia. 48(1): 1-24.
Sanders H L & Allen J A 1973. Studies on deep-sea Protobranchia (Bivalvia); prologue and the Pristiglomidae. Bulletin of the Museum of Comparative Zoology, Harvard. 145: 237-262.


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Record last modified: 17/05/2016