Table
1. Biometric data for Clarias microspilus (n
= 11).
|
|
Holotype |
Range |
Mean
± SD |
|
%SL |
|||
|
Predorsal
length |
36.4 |
31.4–36.4 |
33.8 ±
1.91 |
|
Preanal
length |
49.0 |
49.0–55.0 |
51.7 ±
2.13 |
|
Prepelvic
length |
42.4 |
42.4–46.7 |
44.5 ±
1.71 |
|
Prepectoral
length |
22.0 |
20.3–24.3 |
22.3 ±
1.54 |
|
Length of
dorsal-fin base |
68.3 |
64.7–69.0 |
67.3 ±
1.71 |
|
Anal-fin
length |
48.6 |
47.4–50.5 |
49.2 ±
1.21 |
|
Pelvic-fin
length |
10.9 |
9.2–10.9 |
9.8 ±
0.66 |
|
Pectoral-fin
length |
17.0 |
12.7–17.2 |
14.9 ±
1.94 |
|
Pectoral-spine
length |
12.5 |
9.2–12.5 |
10.5 ±
1.16 |
|
Caudal-fin
length |
18.7 |
14.3–19.2 |
17.2 ±
1.75 |
|
Distance
between occipital process and dorsal fin |
8.9 |
6.5–9.2 |
7.9 ±
1.07 |
|
Body
depth at anus |
18.9 |
14.9–18.9 |
17.2 ±
1.48 |
|
Caudal
peduncle depth |
8.1 |
7.7–9.4 |
8.4 ±
0.62 |
|
Head
length |
28.1 |
25.3–28.1 |
26.9 ±
0.94 |
|
Head
width |
21.7 |
18.6–21.7 |
19.8 ±
1.04 |
|
Head
depth |
15.5 |
12.9–16.0 |
14.6 ±
1.18 |
|
%HL |
|||
|
Snout
length |
31.2 |
26.6–32.0 |
29.4 ±
2.09 |
|
Interorbital
distance |
44.0 |
40.5–44.5 |
43.0 ±
1.42 |
|
Eye
diameter |
6.3 |
6.0–7.2 |
6.3 ±
0.43 |
|
Frontal
fontanel length |
17.3 |
11.5–17.3 |
14.4 ±
2.16 |
|
Frontal
fontanel width |
3.4 |
3.4–6.7 |
5.3 ±
1.15 |
|
Occipital
fontanel length |
8.4 |
7.1–12.8 |
9.6 ±
1.80 |
|
Occipital
fontanel width |
4.2 |
3.9–5.7 |
4.8 ±
0.61 |
|
Occipital
process length |
9.4 |
7.7–14.8 |
11.0 ±
2.39 |
|
Occipital
process width |
40.8 |
31.7–40.8 |
36.8 ±
3.47 |
|
Nasal
barbel length |
105.0 |
84.0–105.0 |
94.8 ±
7.17 |
|
Maxillary
barbel length |
143.7 |
128.0–154.9 |
139.8 ±
11.30 |
|
Inner
mandibular barbel length |
91.1 |
83.3–97.1 |
90.7 ±
5.80 |
|
Outer
mandibular barbel length |
123.6 |
110.3–130.6 |
121.6 ±
7.52 |
Image
1. Clarias microspilus sp.
nov., MZB 8706, holotype, 136.1mm SL; Sumatra: Aceh, Sungai Lembang.
Image
2. Left pectoral spine of C. microspilus,
MZB 8705, paratype, 175.7mm SL.
Figure
1. Collection localities of Clarias microspilus.
Key to
the species of Clarias known
from Sumatra
1 Pectoral spine with regular serrations
on anterior margin..........................................................................2
Pectoral spine smooth or with
irregular bumps on anterior
margin...............................................................4
2 Distance between tip of occipital
process and base of first dorsal-fin ray 6.5–11.1% SL; 22–34 serrations on
anterior edge of pectoral spine;
body typically without irregular black blotches
.............................................3
Distance between tip of occipital
process and base of first dorsal-fin ray 2.8–3.7% SL; 14–22 serrations on
anterior edge of pectoral spine;
body typically with irregular black blotches .............................C.
meladerma
3 Anterior tip of frontal fontanel
reaching line through middle of orbit; posterodorsal margin of pectoral spine
smooth; body depth at anus
14.9–18.9% SL; head width 18.6–21.7% SL; distance between tip of occipital
process and base of first
dorsal-fin ray 6.5–9.2% SL; occipital process width 31.7–40.8% HL..............
...............................................................................................................................C.
microspilus sp. nov.
Anterior tip of frontal fontanel
reaching through anterior orbital margin; posterodorsal margin of pectoral
spine
weakly serrated; body depth at anus
13.4–15.2% SL; head width 16.0–18.7% SL; distance between tip of
occipital process and base of first
dorsal-fin ray 9.3–11.1% SL; occipital process width 25.5–31.5% HL……
...................................................................................................................................................C.
olivaceus
4 Body very elongate, with 74–81 total
vertebrae, 85–100 dorsal-fin rays and 73–91 anal-fin rays.......C.
nieuhofii
Body moderately elongate, with
54–71 total vertebrae, 62–74 dorsal-fin rays and 47–60 anal-fin rays....... 5
5 Distance between tip of occipital
process and base of first dorsal-fin ray 5.4–6.5; anterior profile of head
ovoid
when viewed dorsally; frontal
fontanel long and thin..................................................................C.
batrachus
Distance between tip of occipital
process and base of first dorsal-fin ray 7.1–10.9% SL; anterior profile of head
gently curved when viewed dorsally;
frontal fontanel short and squat...................................C.
leiacanthus