Galeomma sp.

Oliver, P. Graham & Holmes, Anna, 2004, Cryptic bivalves with descriptions of new species from the Rodrigues lagoon, Journal of Natural History 38 (23), pp. 3175-3227 : 3197

Galeomma sp.

( figures 78–80 )

Material examined. One lv, Grand Pate´, 18 m, from shell gravel, NMW.Z.2001.061.00024.

Description. Shell 2.1 6 1.0 mm. Fragile, hyaline. Subequilateral, beaks just in front of midline. Outline oblong; dorsal margin long, straight; anterior and posterior margins narrowly rounded and slightly angulate; ventral margin long convexly curved. Sculpture ( figure 79 ) densely granular, dorsal margin weakly denticulate. Prodissoconch ( figure 80 ) relatively small, PdI 280 mm in diameter, early dissoconch smooth but not demarcated from sculptured area.

Remarks. Species such as G. macroschisma Deshayes, 1856 and G. granulata Ohdner, 1917 have a granular sculpture but not apparently arranged in the same pattern as the Rodrigues shell. The latter may be juvenile and the single valve available does not allow for conclusive comparison.

Figures

FIGS. 75–80. (75–77) Galeomma sagenata holotype, NMW.Z.2001.061.00023, external (SEM). (78–80) Galeomma sp., NMW.Z.2001.061.00024, external (SEM).