Disentangling an Asian puzzle: Two new bathynellid (Crustacea, Syncarida, Parabathynellidae) genera from Vietnam
Author
Camacho, Ana Isabel
text
Journal of Natural History
2005
2005-09-15
39
31
2861
2886
http://dx.doi.org/10.1080/00222930500218524
journal article
10.1080/00222930500218524
1464-5262
5219936
Sketinella
n. g.
(
Figures 8–13
)
Genus diagnosis
Antennule (A.I) (
Figure 9A
) has eight segments, subterminal aesthetascs on the last segment. A.II has six segments. Md has a protuding
pars molaris
. Proximal endite of the Mx.I has four teeth and distal endite has seven teeth. Th 1–7 with more than two segments (three to five) on exopod; basipods of the thoracopods have only one seta; epipodites absent on Th 1 and 2. Th
8 male
large, square; square endopod with two long plumose setae; the large exopod is on the distal face of the basipod, ending in a point with a small lateral tooth or tiny protuberance, curved and overhanging the basipod; distal end of inner lobe exceeding dentate lobe; outer lobe is not fused with basipod; rounded basipod with protuded distal end on the internal lateral edge; dentate lobe rounded and with strong teeth. The first pair of pleopods are a simple seta. Sympod of uropod has three distal spines which are longer than the rest; the endopod of the uropod has two strong distal spines and a kind of ‘‘claw’’ on the distal end; protuded anal operculum.
| 1 |
2 |
3 |
4 |
5 |
6* |
7* |
8* |
9 |
10* |
11* |
12* |
13* |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
| A.I: no. segments |
7 |
7 |
7 |
7 |
7 |
6 |
8 |
8 |
7 |
6 |
6 |
6 |
6 |
6 |
6 |
7 |
6 |
7 |
7 |
8 |
| A.II: no. segments |
5 |
5 |
5 |
5 |
6 |
6 |
6 |
5 |
6 |
5 |
5 |
5 |
5 |
2 |
2 |
6 |
5 |
6 |
6 |
6 |
| Md |
| No. teeth |
|
Pars incisiva
|
4 |
5 |
4 |
? |
4 |
? |
6 |
3 |
5 |
3 |
4 |
4 |
4 |
3 |
3 |
5 |
4 |
6 |
5 |
6 |
|
Pars molaris
|
9 |
4 |
9 |
? |
9 |
? |
12 |
7 |
6 |
7 |
8 |
5 |
5 |
5 |
5 |
5 |
6 |
7 |
10 |
8 |
| Palp a |
N |
E |
N |
? |
N |
? |
E |
? |
N |
E |
E |
E |
E |
N |
E |
N |
N |
E |
N |
N |
| Mx.I: distal teeth |
7 |
? |
6 |
? |
7 |
? |
6 |
5 |
6 |
7 |
6 |
4 |
6 |
5 |
7 |
6 |
7 |
7 |
7 |
7 |
| Th 1 Epipod b |
A |
A |
A |
A |
A |
P |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A |
| Exopod: no. segments |
2 |
2 |
2 |
2 |
3 |
2 |
4 |
3 |
2 |
2 |
1 |
2 |
2 |
2 |
1 |
2 |
2 |
1 |
3 |
3 |
| Th 2 Epipod b |
A |
A |
A |
A |
A |
P |
A |
A |
A |
A |
A |
A |
A |
P |
P |
A |
P |
P |
A |
A |
| Exopod: no. segments |
3 |
3 |
4 |
2 |
4 |
2 |
4 |
4 |
3 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
3 |
2 |
4 |
4 |
| Th 3 Epipod b |
P |
P |
A |
P |
P |
P |
A |
A |
A |
P |
P |
A |
P |
P |
P |
A |
P |
P |
P |
P |
| Exopod: no. segments |
4 |
3 |
4 |
2 |
4–5 |
2 |
5 |
4 |
3 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
3 |
2 |
5 |
5 |
| Th 4–7 Epipod b |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
P |
| Exopod: no. segments |
4–5 |
3 |
5 |
2 |
4–5 |
2 |
6 |
4–5 |
3–4 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
3–4 |
2 |
5 |
5 |
| Th 8 male endopod: no. setae |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
1 |
1 |
1 |
1 |
1 |
2 |
2 |
2 |
1? |
2 |
2 |
2 |
| Th 8 female: no. setae |
0 |
? |
? |
1 |
1 |
? |
? |
4 |
0 |
0 |
0 |
0 |
A |
0 |
0 |
0 |
1 |
2 |
1 |
– |
| Pleopod: first pair c |
1-seg |
1-seg |
1-seg |
1-seg |
1-seg |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A |
A? |
A |
A |
A |
Seta |
| Uropod |
| Sympod |
| No. spines |
6 |
14 |
12 |
6–7 |
11 |
15 |
18 |
15 |
10 |
7–8 |
8 |
5 |
7 |
9 |
13 |
10 |
6–7 |
9–10 |
7 |
12 |
| Type spines d |
U |
U |
U |
U |
U |
D |
U |
D |
U |
D |
U |
D |
D |
D |
D |
D |
U |
U |
U |
D |
| Exopod: no. setae |
5 |
3 |
5 |
3 |
6 |
3 |
6 |
5 |
3 |
3 |
2 |
3 |
4 |
3 |
2 |
2 |
4 |
4 |
6 |
7 |
| 1 |
2 |
3 |
4 |
5 |
6* |
7* |
8* |
9 |
10* |
11* |
12* |
13* |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
| Endopod |
| No. spines |
5 |
2 |
6 |
0 |
5 |
2 |
2 |
2 |
0 |
1 |
0 |
0 |
3 |
0 |
0 |
1 |
2 |
1 |
2 |
2 |
| No. setae |
4 |
2 |
5 |
3 |
5 |
4 |
4 |
4 |
2 |
3 |
3 |
4 |
3 |
2 |
2 |
4 |
4 |
4 |
4 |
4 |
|
Furca
: no. spines
|
5 |
5 |
6 |
3 |
5 |
6 |
6 |
6 |
5 |
3 |
3 |
4 |
3 |
6 |
9 |
4–5 |
4 |
3 |
5 |
7 |
| Anal operculum e |
Np |
Pr/S |
Np |
Pr/L |
Pr/S |
Pr/L |
Np |
Pr/S |
Np |
Pr/S |
Pr/M |
Np? |
Pr/S |
Pr/S |
Pr/S |
Pr/S |
Pr/S |
Np |
Pr/M |
Pr/M |
| Maximum size (mm) |
2.2 |
2.0 |
2.0 |
1.4 |
1.7 |
2.2 |
3.2 |
2.3 |
2.3 |
1.2 |
1.5 |
1.0 |
1.3 |
1.5 |
1.3 |
2.0 |
1.5 |
2.1 |
1.6 |
1.9 |
| Habitat f |
W |
W |
W |
W |
C/W |
W |
W |
W |
C |
W/R |
W |
W |
W |
W |
R |
W |
C |
R |
C |
C |
Figure 8. Photograph of
Sketinella trontelji
n. g.
n. sp., male holotype (optical microscope 10×).
Type
species.
Sketinella trontelji
n. sp.