RESEARCH ARTICLE
Four new species of Trimma
(Pisces: Gobiidae) from Papua New Guinea and Indonesia
Gerald R. Allen
Abstract
Four new
species belonging to the gobiid genus Trimma
are described from the Indo-Australian Archipelago.
Trimma abyssum is described from two specimens,
28.8-31.6 mm SL, collected in 107 m depth at
Siladen Island, North Sulawesi, Indonesia. Diagnostic
features include the combination of 7-8 segmented
dorsal rays, the second and third spines longest with
short filamentous tips reaching base of first two
segmented rays of the second dorsal fin when adpressed;
anal rays I,8; pectoral rays 16, all unbranched; unbranched
fifth pelvic ray 48-55% length of fourth pelvic
ray; bony interorbital 53-65% pupil diameter;
fully scaled nape with 12-13 scales in midline
of predorsal; scales covering cheek and opercle; ctenoid
scales on breast (prepelvic); and prominent dark bar
at caudal-fin base and scale pockets strongly outlined
with melanophores. The remaining three species were
collected at Milne Bay Province, Papua New Guinea.
Trimma chledophilum is described from 19 specimens,
13.5-22.2 mm SL, collected in 17-18 m depth
near the town of Alotau. Diagnostic features include
the combination of 9 (rarely 10) segmented dorsal
rays, second spine elongate and filamentous, reaching
caudal-fin base when fully developed; segmented anal
rays 8 (rarely 9); pectoral rays 16-18 (usually
17); fifth pelvic ray branched, 62-71% length
of fourth pelvic ray; bony interorbital 46-62%
pupil diameter; midline of predorsal broadly scaleless;
cheek and opercle scaleless; and mainly bright orange
red in life except white on breast belly, and lower
half of head, also white stripe on midline of snout.
Trimma nauagium is described from 3 specimens,
17.4-20.3 mm SL, collected in 24 m depth from
a shipwreck off the village of Waga Waga. Diagnostic
features include the combination of 8 segmented dorsal
and anal rays, the second and third dorsal spines
elongate, reaching to base of fifth or sixth segmented
ray of second dorsal fin when adpressed; pectoral
rays 16; fifth pelvic ray branched, 56-64% length
of fourth pelvic ray; bony interorbital equal to pupil
diameter; predorsal, cheek, and opercle fully scaled;
predorsal scales 12; pattern of cephalic sensory papillae
includes five transverse rows below eye; and brownish
in life with pink zone along upper side and seven
darker brown saddles on back interspersed with smaller
golden saddles, narrow white bar behind eye, and yellowish
bar at base of pectoral fin. Trimma multiclitellum
is described from a single specimen, 17.4 mm SL, collected
in 17-18 m depth near the town of Alotau. Diagnostic
features include the combination of 8 dorsal and anal
segmented rays; pectoral rays 17; caudal fin emarginate
with pointed upper lobe and rounded lower lobe; fifth
pelvic ray branched, 74% length of fourth pelvic ray;
basal membrane 41% length of fourth pelvic ray; bony
interorbital about equal to pupil diameter; midline
of predorsal mainly scaleless, but with patch of about
4 scales on middle portion; cheek scaleless; opercle
with a few scales dorsally; and highly distinctive
colour pattern consisting of seven, alternating brown
and white bars on upper side, a nearly eye-sized black
spot at base of caudal fin, and pair of yellow bars
on head, one below eye and another on opercle.
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CITATION:
Allen, G.R. (2015) Four new
species of Trimma (Pisces: Gobiidae) from Papua
New Guinea and Indonesia. Journal of the Ocean
Science Foundation, 14, 28-48.
https://doi.org/10.5281/zenodo.1037603
publication date: 8 March
2015
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