RESEARCH ARTICLE
Bodianus atrolumbus
(Valenciennes 1839), a valid species of labrid fish
from the southwest Indian Ocean
John E. Randall and Benjamin
C. Victor
Abstract
Bodianus
atrolumbus (Valenciennes 1839), a labrid fish
of the southwest Indian Ocean (type locality Mauritius),
was placed in the synonymy of B. perditio (Quoy
& Gaimard), antitropical in the Pacific Ocean
(type locality Tonga), by Smith (1949) who reported
the first record for southern Africa. Juveniles of
both species are mostly the same in color, featuring
a white bar in the middle of the body, followed dorsally
by a large black area. The white bar develops into
an oval yellow area dorsally on the body in B.
perditio, whereas it narrows to a spindle-shaped
whitish to pink mark on the upper body that extends
below the lateral line in B. atrolumbus. An
analysis of the mitochondrial DNA barcode sequence
(COI) from specimens collected from all quadrants
of the the species range reveals that the two
species are 3.91% different (K2P minimum interspecific
distance), while intraspecific variation is no more
than 0.34%. A phenetic tree of barcode sequences for
twenty Bodianus species is presented, showing
that pairwise species differences range from 1.97%
to 21.74%, with Indian/Pacific sibling-species pairs
accounting for the lower range of divergences (1.97%
to 4.64%). A modal difference in the count of gill
rakers and the distinctly shorter pectoral fins of
B. atrolumbus additionally differentiate it
from B. perditio.
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CITATION:
Randall, J.E. & Victor,
B.C. (2013) Bodianus atrolumbus (Valenciennes
1839), a valid species of labrid fish from the southwest
Indian Ocean. Journal of the Ocean Science Foundation,
8, 44-61.
https://doi.org/10.5281/zenodo.1041974
publication date: 1 October
2013
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