Species Account

Microgloma pusilla (Jeffreys, 1879)

Nuculanoidea : Nuculanidae

Tebble name: Phaseolus pusillus (Jeffreys)
Smith & Heppell name: Microgloma yongei 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: Broadly elliptical, anteriorly extended; height of shell approximately 70% of the length; dorsal margins straight, relatively long, sloping; posterior margin narrowly rounded, anterior margin more broadly 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. Ligament: Internal, amphidetic, oval, sat in a simple resilifer below the beaks. Hinge: Taxodont: hinge relatively strong with 4-5 anterior teeth, 5-6 posterior teeth. Pallial Musculature: Indistinct. Periostracum: Glossy, very pale straw coloured. Colour: Translucent white.

Distribution & Ecology

A deep water species living at bathyal depths (200-1200m). Known from southwest Iceland, Norway, Bay of Biscay and Mediterranean.

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

Additional Information & Related Species


Listed are literature citing Microgloma pusilla (Jeffreys, 1879). Reference containing the species Type Description is highlighted.

Jeffreys J.G. 1879. On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ Expeditions, 1868-70. (Part II). Proceedings of the Zoological Society of London. 1879: 553-588.
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.


  • Conchological Society of Great Britain & Ireland
    Provides resources for understanding, identifying, recording, and conserving molluscs
    Check List of European Marine Mollusca
  • MarLIN
    The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
  • NBN Gateway
    National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
  • BivAToL
  • MarBEF
  • Malacological Society
  • Unitas Malacologica
  • Census of Marine Life
  • MarBEF
    MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.

Image Gallery

Record last modified: 22/03/2016