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Molecular analysis using four genes (12S, 16S, Cytb, and COI) suggested that a common cold-seep species in the Gulf of Mexico, Acesta bullisi, should be divided into two distinct species - A. bullisi and A. oophaga. This conclusion was supported by morphological traits and observations of ecological distribution.
Description: The maximum shell height is 113 mm. The shell is quite wide, and in older individuals is thick and more strongly striated than in A. excavata or A. bullisi. The shell is equivalve. The anterior ears are almost reduced, and posterior conspicuous. A notch in the lunular area is present in adult specimens which is lacking in juveniles. There is a pronounced pouting of the shell below the lunular area.
(Järnegen et al., 2007)