178 
G.R. Alleh 
Table 1 Proportional measurements of type specimens of Apogon unitaeniatus expressed as percentage of the standard 
length (* denotes damaged fins). 
Holotype Paratypes 
Character 
AMS 
1.20402 
-036 
NTM 
S.13711 
-008 
NTM 
S.13711 
-008 
AMS 
1.20402 
-000 
NTM 
S.13711 
-008 
WAM 
P.30743 
-001 
NTM 
S.13711 
-008 
Standard length (mm) 
50.2 
57.6 
51.8 
50.5 
48.2 
47.6 
47.0 
Body depth 
39.6 
36.3 
36.9 
39.0 
35.3 
36.8 
36.6 
Body width 
16.9 
17.2 
16.0 
17.0 
15.4 
17.0 
16.4 
Head length 
40.8 
42.0 
40.9 
42.6 
38.2 
41.0 
39.4 
Snout length 
10.8 
9.2 
8.1 
10.3 
9.1 
8.4 
9.4 
Orbit diameter 
13.9 
12.7 
12.7 
12.5 
12.0 
12.2 
13.2 
Interorbital width 
10.0 
9.5 
9.7 
9.1 
9.1 
9.0 
9.4 
Upper jaw length 
21.1 
21.2 
21.6 
20.8 
20.3 
20.0 
21.9 
Caudal peduncle depth 
14.7 
16.1 
16.4 
15.4 
14.7 
13.7 
14.5 
Caudal peduncle length 
24.7 
25.7 
24.7 
23.2 
28.4 
25.6 
25.5 
Predorsal length 
46.2 
41.1 
40.9 
44.2 
40.9 
41.4 
41.5 
Preanal length 
65.3 
65.1 
64.1 
66.3 
64.3 
63.7 
65.5 
Prepelvic length 
38.0 
39.6 
40.3 
40.6 
37.6 
40.5 
38.3 
Length 1st dorsal spine 
1.8 
1.9 
2.7 
3.0 
2.1 
2.3 
2.1 
Length 2nd dorsal spine 
7.8 
5.7 
6.6 
7.7 
7.1 
8.0 
7.0 
Length 3rd dorsal spine 
17.5 
16.3 
16.0 
18.6 
17.6 
17.6 
17.7 
Spine of 2nd dorsal 
15.9 
15.6 
13.3 
13.3 
13.2 
13.2 
13.2 
Longest dorsal ray 
*18.9 
26.9 
26.4 
16.8 
25.9 
*21.8 
23.4 
Length 1st anal spine 
3.4 
2.3 
3.3 
3.4 
2.7 
2.3 
3.8 
Length 2nd anal spine 
8.8 
14.1 
14.1 
12.1 
13.7 
14.1 
12.8 
Longest anal ray 
*14.1 
22.6 
23.0 
*15.4 
22.4 
*19.1 
21.1 
Caudal fin length 
*21.9 
35.1 
32.6 
*24.9 
36.1 
*22.4 
34.5 
Caudal concavity 
*3.9 
9.7 
9.7 
‘2.9 
11.6 
*7.5 
8.5 
Pectoral fin length 
*6.1 
25.9 
27.0 
*7.1 
24.9 
24.4 
26.6 
Pelvic spine length 
15.1 
14.9 
13.9 
15.4 
15.1 
14.3 
14.5 
Pelvic fin length 
17.7 
24.0 
22.8 
20.8 
23.2 
22.7 
22.3 
holotype; NTM S.13706-007, 15 specimens, 23.5- 
57.7 mm SL, middle of Fannie Bay, Darwin 
Harbour, Northern Territory (approximately 
12°25.6’S, 130°49'S) 3-4 m, R. Williams, 7 July 1993; 
NTM S.13707-002, 9 specimens, 23.6-36.2 mm SL, 
north of Talc Head, Darwin Harbour 
(approximately 12°27.8'S 130°46'S), 2 m, R. 
Williams, 8 July 1993; NTM S.13711-008, 60 
specimens, 17.8-57.7 mm SL, off Mila Beach, 
Darwin Harbour (approximately 12°29.6'S, 
130°46.5'E), 1-2 m, R. Williams, 8 July 1993; NTM 
S.13721-006, 50.5 mm SL, south of Mitchell Creek, 
Darwin Harbour (approximately 12°30.9'S, 
130°56.4'E), 7 m, R. Williams, 16 July 1993; NTM 
S.13723-003, 3 specimens, 27.9-28.7 mm SL, mouth 
of Hudson Creek, Darwin Harbour (approximately 
12°29.3'S, 130°55.4'E), 2 m, R. Williams, 16 July 
1993; NTM S.13732-001, 52.5 mm SL, north of Lee 
Point, Shoal Bay, Northern Territory 
(approximately 12°16'S, 130°54'E), 17 m, R. 
Williams, 16 March 1993; NTM S.13735-011, 33.3 
mm SL, West Arm, Darwin Harbour 
(approximately 12°33.3'S, 130°46.7'S), 12 m, R. 
Williams, 9 September 1993; NTM S.13813-001, 
36.0 mm SL, north end of Shoal Bay, Northern 
Territory (approximately 12°13'S, 130°56'S), 13 m, 
R. Williams, 12 October 1993; WAM P.30743-001, 
47.6 mm SL, collected with holotype. 
Diagnosis 
A species of the subgenus Pristiapogon with the 
following combination of characters: dorsal rays 
VII-1,9; anal rays 11,8; pectoral rays 15; lateral-line 
scales 24; predorsal scales 4; gill rakers 7-9+15-16, 
including 1-2 rudiments at beginning of upper and 
lower limbs; fine serrae present on margin of 
preopercle, preopercular ridge, and circumorbitals; 
body depth 2.5-2.8 in SL; colour entirely whitish 
except for dark midlateral stripe extending from 
upper edge of preopercle to base of caudal fin. 
Description 
Dorsal rays VII-1,9; anal rays 11,8; all dorsal and 
anal soft rays branched, the last to base; pectoral 
rays 15, the uppermost and lowermost pairs 
unbranched; pelvic rays 1,5, all rays branched; 
principal caudal rays 17, the upper and lowermost 
rays unbranched; upper and lower procurrent 
caudal rays 6, the most posterior segmented; 
lateral-line scales 24, plus 5 pored scales posterior 
to hypural plate, the last narrow, somewhat 
triangular; scales above lateral line to origin of 
dorsal fin 2; scales below lateral line to origin of 
anal fin 6; median predorsal scales 4, the fourth 
notched posteriorly to accommodate origin of first 
dorsal fin; circumpeduncular scales 11; gill rakers 
7+15 (7-9+15-16), including 1-2 rudiments at 
