Acesta oophaga

Acesta oophaga Järnegen, Schandler, Sneli, Ronningen & Young, 2007

Languages: English

Overview

General Description

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)

Author(s): Allen, Chris
Rights holder(s): Allen, Chris

Description

Genetics

The COI sequences given below should be considered diagnostic for the species.

Gene accession numbers: AM494900, 494901, 494902, 494903 and 494904

(Järnegen et al., 2007)

Author(s): Allen, Chris
Rights holder(s): Allen, Chris

Ecology and Distribution

Distribution

Hydrocarbon seeps in the Gulf of Mexico between 400-800 m depth, attached to the tubeworm Lamellibrachia luymesi (Järnegen et al., 2007)

Author(s): Allen, Chris
Rights holder(s): Allen, Chris

Habitat

Found associated with cold-seeps on the upper Louisiana slope in the northern Gulf of Mexico, always associated with the tubeworm Lamellibrachia luymesi at depths between 400-700 m (Järnegen et al., 2007)

Author(s): Allen, Chris
Rights holder(s): Allen, Chris

References

Järnegen, J., Schander C., Sneli J. - A., Ronningen V., & Young CM. (2007).  Four genes, morphology and ecology: distinguishing a new species of Acesta (Mollusca; Bivalvia) from the Gulf of Mexico. Marine Biology. 152, 43-55.