Species Account

Isorropodon mackayi Oliver & Drewery, 2014

Glossoidea : Vesicomyidae

Tebble name: n/a
Smith & Heppell name: n/a

To size: To 16mm. Shell Structure: Brittle, rather thin. Equivalve: Equivalve. Equilateral: Inequilateral, beaks well in front of midline. Tumidity: Rather slender. Outline: Elliptical, distinctly longer than high, umbos low, dorsal margins gently sloping, anterior bluntly rounded, posterior more narrowly rounded, ventral gently curved. Lunule narrowly cordate defined by a weak incised line. Escutcheon very shallow and narrow.

Sculpture: Shiny, smooth except for weak commarginal lines and undulations. Margin: Inner margin smooth. Ligament: External, slender, set on a shallow nymph. Hinge: Three small teeth in each valve, RV with a prominent spoon shaped 1 projecting ventrally, 3a and 3b joined, parallel with hinge margin, 3a ~-shaped, 3b simple; LV with a simple 4b at an angle to the hinge plate, 2a and 2b joined, parallel with hinge margin, 2a ~-shaped, 2b simple. Pallial Musculature: Scars weakly impressed, indistinct. Adductor scars subequal.Pallial sinus as a weak straightening only, not indented. Periostracum: Very thin, transparent. Colour: Shell off white.

Distribution & Ecology

Known only from a single location in the Hatton-Rockall Basin. In keeping with the genus as a whole I. mackayi is chemosymbiotic and associated with cold seep settings.

Depth Range
Bathyal (500 - 2000m)

Additional Information & Related Species

Juvenile Description

Juveniles can be identified by the vesicomyid hinge but differ from Vesicomya in their elliptical outline.

Key Features & Similar Species

No other Isorropodon species have been found in British waters but I. nyeggaense Krylova, 2011 was described from the Nyegga pock mark in Norwegian waters at 720m. This species differs in having a more tumid shell and subovate in outline rather than elliptical.
Other species are reported from the Mediterranean and more southern parts of the Atlantic Ocean, see papers below.

Related Species

Glossoidea : Vesicomyidae


Listed are literature citing Isorropodon mackayi Oliver & Drewery, 2014. Reference containing the species Type Description is highlighted.

Cosel R. & Salas C. 2001. Vesicomyidae (Mollusca: Bivalvia) of the genera Vesicomya, Waisiuconcha, Isorropodon and Callogonia in the eastern Atlantic and Mediterranean. . Sarsia. 86: 333-366.
Krylova, E.M., Gebruk A.V., Portnova D.A., Todt C. & Haflidason H. 2011. New species of the genus Isorropodon (Bivalvia: Vesicomyidae: Pliocardiinae) from cold methane seeps at Nyegga (Norwegian Sea, Vøring Plateau, Storrega Slide). . Journal of the Marine Biological Association of the United Kingdom. 91: 1135-1144.
Oliver P.G. & Drewery J. 2014. New species of chemisymbiotic clams (Bivalvia: Vesicomyidae and Thyasiridae) from a putative ‘seep’ in the Hatton-Rockall Basin, north-east Atlantic.. Journal of the Marine Biological Association of the United Kingdom. 94 (2): 389-403.
Oliver P.G., Rodrigues C.F. & Cunha M.R. 2011. Chemosymbiotic bivalves from the mud volcanoes of the Gulf of Cadiz, NE Atlantic, with descriptions of new species of Solemyidae, Lucinidae and Vesicomyidae. Zookeys. 113: 1-38.


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Record last modified: 11/04/2016