Brachiomya Jespersen et al., 2004 Brachiomya Jespersen, Lützen & C. Nielsen, 2004. Type species (original designation) Solecardia stigmatica (Pilsbry, 1921). Recent. Description. Shell small (less than 5 mm); transversely ovate; anterior end narrower than posterior end; inequilateral; hinge plate narrow; both valves with a small triangular pseudocardinal tooth beneath umbos; ligament internal, in oblique resilifer; mantle folds wrapped over most of the shell and anteriorly extended into a large inhalant-pedal siphon, posteriorly into a smaller exhalent siphon; mantle with many slender, terminally spatulate tentacles; foot elongate; gills with inner demibranch only. Discussion. Jespersen et al. (2004) distinguished Brachiomya from other galeommatoidean genera by the presence of extensive mid-mantle folds with many spatulate tentacles. Huber (2015) accepted Brachiomya as a monotypic genus. As Jespersen and Huber both postulated, we have found Brachiomya to group with members of the Lasaeidae. All species are likely to be obligate commensals with echinoid echinoderms.

Published as part of Valentich-Scott, Paul, Griffiths, Charles, Landschoff, Jannes, Li, Ruiqi & Li, Jingchun, 2024, Bivalves of superfamily Galeommatoidea (Mollusca, Bivalvia) from western South Africa, with observations on commensal relationships and habitats, pp. 301-323 in ZooKeys 1207 on pages 301-323, DOI: 10.3897/zookeys.1207.124517