Abstract
Barilius signicaudus
, a new species of cyprinid fish from the Khwae
Noi and Khwae Yai branches
of the Maeklong River,
western Thailand, is described. It is characterized by the co
mbination of a large, elongated blotch at the caudal-fin base
(blotch is formed by the fusion of the large caudal spot at the
fleshy end of the caudal base and the last vertical bar on the
flank) that extends about 1/3 of the distance from the caudal-fi
n origin beyond the last scale on the caudal base to the mar-
gin of the caudal fork; an anal-fin origin opposing the 2nd–4t
h branched dorsal-fin rays; eight scale rows above the lateral
line; dark pigment on the dorsal fin concentrated mainly along
the margins of the rays; 36 or more precaudal lateral-line
scales; and small dentary tubercles. This
species has previously been identified as
Barilius pulchellus
and
Barilius orna-
tus
.
Barilius pulchellus
has no, or a small caudal spot, a dorsal fin with da
rk pigments concentrated
in the middle of the
interradial regions, and much larger dentary tubercles.
Barilius ornatus
and similar species have an anal-fin position that
opposes the 5th–7th branched dorsal-fin rays (rarely the 4th), or does not overlap with them at all, and have no, or small
caudal spots.
Abstract
Barilius signicaudus
, a new species of cyprinid fish from the Khwae
Noi and Khwae Yai branches
of the Maeklong River,
western Thailand, is described. It is characterized by the co
mbination of a large, elongated blotch at the caudal-fin base
(blotch is formed by the fusion of the large caudal spot at the
fleshy end of the caudal base and the last vertical bar on the
flank) that extends about 1/3 of the distance from the caudal-fi
n origin beyond the last scale on the caudal base to the mar-
gin of the caudal fork; an anal-fin origin opposing the 2nd–4t
h branched dorsal-fin rays; eight scale rows above the lateral
line; dark pigment on the dorsal fin concentrated mainly along
the margins of the rays; 36 or more precaudal lateral-line
scales; and small dentary tubercles. This
species has previously been identified as
Barilius pulchellus
and
Barilius orna-
tus
.
Barilius pulchellus
has no, or a small caudal spot, a dorsal fin with da
rk pigments concentrated
in the middle of the
interradial regions, and much larger dentary tubercles.
Barilius ornatus
and similar species have an anal-fin position that
opposes the 5th–7th branched dorsal-fin rays (rarely the 4th), or does not overlap with them at all, and have no, or small
caudal spots.
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