Taxonomical, ecological and zoogeographical studies on anisitsiellid water mites (Acari: Hydrachnidia: Anisitsiellidae Koenike, 1910) from Madagascar
Author
Goldschmidt, Tom
text
Zootaxa
2008
2008-12-05
1954
1
1
120
https://biotaxa.org/Zootaxa/article/view/zootaxa.1954.1.1
journal article
10.11646/zootaxa.1954.1.1
11755334
5240917
Nilotonia
(
Dartonia
)
nifymanana
sp. nov.
(Figs 28–40 (41, 42),
Table 3
)
Type:
Holotype
female
,
MD 20
b,
Ionilahy
(
Fianarantsoa
), first left tributary of
Rivière Ionilahy
upstream railroad bridge to
Manakara
, pool,
200 m
asl
, 23.5 °C, 88 µS/cm,
11.08.2001
, mounted.
Additional specimens examined:
MD
118b, Maromandia (Majunga), left tributary of Rivière Andranamalaza, pool, about 1.0 km east from main road,
100 m
asl, 25.5 °C, 36 µS/cm,
21.10.2001
, 1/1/0 mounted.
Habitat:
Streams at
100–200 m
asl.
Distribution:
Madagascar
(Eastern and North-western lowland).
Derivatio nominis:
Nify
(Malagasy) — tooth,
manana
(Malagasy) — bearing; referring to the dense field of characteristic denticles the species bears on the ventral surface of P2.
Diagnosis:
Dorsum according to the ‘groundplan’ of the genus; integument coarsely lined; venter nearly without secondary sclerotization (only small area at medial margin of Cx-III); Cx-I and Cx-II medially not fused, suture between Cx-III and Cx-IV incomplete; genital field large, acetabula large, oval-rounded, Ac3 round; posterior genital sclerite small; legs bearing many heavy setae; leg-I to -III with claws, bearing ventrally serrate clawlets, leg-IV distally with two long sub-terminal setae, no sexual dimorphism in the legs; palp compact, P2 medio-ventrally with a dense field of denticles.
Description, female
(n = 2): Idiosoma relatively large (L/W 775 (746)/608 (559)); integument dorsally and ventrally coarsely lined; posterior dorsal plate small (L/W 132 (123)/110 (105)), nearly rounded, anterior dorsal platelets small (L/W 47 (40)/34 (32)), oval, one pair of knob-like sclerites anterior to posterior plate, one knob-like sclerite anterior to each anterior platelet; Dgl-1 with very strong, pinnate setae, Dgl-2 and -6 with smaller setae, Dgl-3 to -5 with stronger setae; lateral eyes free under the integument, relatively far separated from each other on each side, anterior eye postero-lateral to Dgl-1, posterior eye postero-lateral to Dgl- 2, accompanied by a bowl-shaped sclerite, l1 caudal to posterior eye (Fig. 29); Cx-I elongated, medial margin long (L 135 (118)), clearly separated, lateral margin lying over Cx-II, Cx-II postero-laterally lying over Cx- III; Cx-IV relatively small, medial margin of Cx-III/IV relatively straight, oblique, with very small secondary sclerotization, caudal margin of Cx-IV transverse (perpendicular to medial line), medial with a clear corner; Cxgl-2 partly under the posterior margin of Cx-II, fused with Cx-III, Cxgl-4 postero-median, closely approached to the anterior margin of Cx-III (Fig. 28); genital field anterior close to coxal field, genital flaps large, elongated, nearly straight, posteriorly tapering; acetabula large, touching each other, Ac1 and Ac2 oval (in the specimen drawn in Fig. 28, the left Ac1 is split into two acetabula), Ac3 rounded; anterior genital sclerite broad crescent shaped, posterior genital sclerite small, caudal margin straight, submerged under genital field (Fig. 28); excretory pore without sclerotization; Vgl on small platelets (Fig. 28); legs strong, bearing many large setae (several pinnate); leg-I to leg-III terminate in strong claws with one dorsal and about six ventral comb-like clawlets (Fig. 30), leg-IV-6 distally pointed (variable, see Figs 32, 33), with two large, pinnate sub-terminal setae (Figs 31–33); capitulum compact, rostrum short, chelicera caudally tapering (Fig. 34), palps relatively short, compact, P1 with one dorsal seta, P2 very stout, dorsally bearing six strong, pinnate setae, medio-ventrally with a dense field of denticles, latero-ventrally with a long seta, P3 with 3 dorsal and one ventro-lateral setae, ventral margin curved, P4 relatively compact, with ventral setae on clear protrusions (Figs 34, 35).
Male
(n = 1 (juvenile)): Genital field more compact, less extended beyond caudal margin of coxal field, Cx-IV closer approached to genital field (
Fig. 36
); genital skeleton compact (slightly distorted in preparation,
Fig. 37
), brachia distalia and proximalia strong, brachia proximalia long and slender, carina anterior and posterior distinct, short and high (
Fig. 37
); legs as in female (
Figs 38, 39
); capitulum as in female, P2 more slen- der (
Fig. 40
).
Remarks:
Nilotonia
(
Dartonia
)
nifymanana
sp. nov.
is separated from
Nilotonia
(
Dartiella
)
ivelany
and
Nilotonia
(
Dartiella
)
onilahy
in the very small dorsal plate and platelets, the coarse lined integument, the more compact palps (especially the expanded P2 with ventral denticles), the leg claws (with comb-like ventral clawlets) and the two long, sub-terminal setae on leg-IV-6. The character state of an incomplete suture between Cx-III and Cx-IV and claws on leg-I to -III with serrate ventral clawlets is shared with two North African (
N
. (
Dartiella
)
parva
(
Walter, 1931
)
and
longipora
(
Walter, 1925
))
and three East African species (
N.
(
Dartiella
)
robusta
(
Walter, 1931
)
,
thermophila
(
Lundblad, 1951
)
and
micropora
(
Walter, 1939
)).
Nilotonia
FIGURES 28, 29, 32–35.
Nilotonia
(
Dartonia
)
nifymanana
sp. nov.
, female holotype (MD 20b);
30, 31.
Nilotonia
(
Dartonia
)
nifymanana
sp. nov.
, female (MD 118b): 28, idiosoma, ventral view; 29, idiosoma, dorsal view; 30, leg-II-2 to -6; 31, leg-IV; 32, leg-IV-6, posterior view; 33, leg-IV-6, anterior view; 34, capitulum with left palp and chelicera, lateral view; 35, right palp, medial view. Scale bars = 100 µm.
TABLE 3.
Measurement data for
Nilotonia
(
Dartonia
)
nifymanana
sp. nov.
Measurements given in µm.
|
Nilotonia nifymanana
|
| male (juv.) |
female |
| holotype |
| Idiosoma tL |
491 |
775 |
746 |
| Idiosoma tW |
378 |
608 |
559 |
| Ant dp L |
34 |
47 |
40 |
| Ant dp W |
27 |
34 |
32 |
| Post dp L |
98 |
132 |
123 |
| Post dp W |
88 |
110 |
105 |
| Coxal field tL |
358 |
324 |
373 |
| Cx-III W |
363 |
461 |
383 |
| Coxal field tL/Cx-III W |
0.99 |
0.70 |
0.97 |
| Cx-I mL |
115 |
135 |
118 |
| Cx-III mL |
49 |
37 |
37 |
| Cx-I / Cx-III mL |
2.35 |
3.67 |
3.20 |
| Genital field L |
135 |
184 |
154 |
| Genital field W |
113 |
125 |
| Genital field L/W |
1.20 |
1.47 |
| pregen sc W |
61 |
103 |
91 |
| pregen sc L |
15 |
22 |
22 |
| postgen sc W |
74 |
96 |
| postgen sc L |
17 |
12 |
| Ac1 L |
49 |
74 |
61 |
| Ac1 W |
15 |
27 |
18 |
| Ac2 L |
45 |
59 |
59 |
| Ac2 W |
17 |
25 |
20 |
| Ac3 L |
37 |
49 |
34 |
| Ac3 W |
29 |
32 |
29 |
| Gs L |
157 |
| Capitulum vL |
147 |
191 |
159 |
| Capitulum H |
110 |
149 |
123 |
| Chelicera L |
261 |
338 |
294 |
| Chelicera bs L |
201 |
257 |
| Chelicera claw L |
69 |
93 |
| Chel bs / claw L |
2.93 |
2.76 |
| P1 dorsal L |
27 |
27 |
25 |
| P2 dL |
110 |
145 |
118 |
| P3 dL |
61 |
86 |
61 |
| P4 dL |
108 |
145 |
113 |
| P5 dL |
25 |
37 |
29 |
| Palp tL |
331 |
439 |
345 |
| P1 rel L |
0.08 |
0.06 |
0.07 |
......continue
TABLE 3.
(continued)
|
Nilotonia nifymanana
|
| male (juv.) |
female |
| holotype |
| P2 rel L |
0.33 |
0.33 |
0.34 |
| P3 rel L |
0.19 |
0.20 |
0.18 |
| P4 rel L |
0.33 |
0.33 |
0.33 |
| P5 rel L |
0.07 |
0.08 |
0.09 |
| P1 H |
43 |
58 |
49 |
| P2 H |
71 |
91 |
81 |
| P3 H |
47 |
64 |
54 |
| P4 H |
34 |
38 |
36 |
| P5 H |
17 |
22 |
20 |
| P1 L/H |
0.63 |
0.47 |
0.50 |
| P2 L/H |
1.55 |
1.59 |
1.45 |
| P3 L/H |
1.32 |
1.35 |
1.14 |
| P4 L/H |
3.14 |
3.81 |
3.17 |
| P5 L/H |
1.43 |
1.67 |
1.50 |
| I-leg-1 L |
56 |
66 |
| H |
59 |
59 |
| I-leg-2 L |
59 |
71 |
| H |
54 |
61 |
| I-leg-3 L |
74 |
71 |
| H |
47 |
44 |
| I-leg-4 L |
93 |
91 |
| H |
44 |
49 |
| I-leg-5 L |
110 |
103 |
| H |
37 |
39 |
| I-leg-6 L |
130 |
113 |
| H |
39 |
44 |
| II-leg-1 L |
64 |
61 |
| H |
56 |
74 |
| II-leg-2 L |
71 |
86 |
78 |
| H |
56 |
69 |
56 |
| II-leg-3 L |
74 |
96 |
78 |
| H |
44 |
61 |
49 |
| II-leg-4 L |
94 |
132 |
113 |
| H |
44 |
58 |
49 |
| II-leg-5 L |
110 |
157 |
127 |
| H |
37 |
47 |
39 |
| II-leg-6 L |
118 |
147 |
140 |
| H |
42 |
49 |
42 |
| III-leg-1 L |
69 |
93 |
......continue
TABLE 3.
(continued)
|
Nilotonia nifymanana
|
| male (juv.) |
female |
| holotype |
| H |
59 |
49 |
| III-leg-2 L |
108 |
100 |
| H |
49 |
49 |
| III-leg-3 L |
96 |
93 |
| H |
42 |
44 |
| III-leg-4 L |
172 |
159 |
| H |
44 |
44 |
| III-leg-5 L |
159 |
152 |
| H |
37 |
39 |
| III-leg-6 L |
132 |
140 |
| H |
40 |
39 |
| IV-leg-1 L |
123 |
147 |
115 |
| H |
65 |
83 |
64 |
| IV-leg-2 L |
91 |
110 |
93 |
| H |
43 |
59 |
44 |
| IV-leg-3 L |
98 |
127 |
100 |
| H |
42 |
51 |
42 |
| IV-leg-4 L |
167 |
213 |
169 |
| H |
42 |
54 |
44 |
| IV-leg-5 L |
179 |
221 |
181 |
| H |
34 |
39 |
32 |
| IV-leg-6 L |
159 |
186 |
159 |
| H |
20 |
25 |
22 |
| Sub-terminal seta 1 L |
66 |
71 |
71 |
| Sub-terminal seta 2 L |
39 |
51 |
47 |
(
Dartiella
)
micropora
is separated from all other African (and Malagasy) species due to its very small acetabula (
Walter 1939
).
Nilotonia
(
Dartiella
)
parva
is very similar to
N.
(
Dartiella
)
robusta
, however
N. parva
is smaller and the integument is more densely lined. Both North African species bear more slender palps than
N.
(
Dartonia
)
nifymanana
; furthermore,
N.
(
Dartiella
)
parva
does not bear any large setae (terminal or sub-terminal) on leg-IV-6 and all acetabula are elongated-oval; in
N.
(
Dartiella
)
longipora
, the acetabula are much smaller and more slender (
Walter 1925
,
1931
).
N.
(
Dartiella
)
thermophila
bears only very small denticles on the ventral surface of P2 and only small comb-like ventral clawlets on leg-I to -III, in
N.
(
Dartiella
)
robusta
and
N.
(
Dartonia
)
nifymanana
these two characters are strongly developed. In
N.
(
Dartiella
)
robusta
and
thermophila
the genital field is smaller and not as close to the coxal field, than it is in
N.
(
Dartonia
)
nifymanana
; additionally, in these species the acetabula are smaller and all of equally oval shape, whereas in
N.
(
Dartonia
)
nifymanana
Ac
3 is rounded. Finally, the most similar East African species,
N.
(
Dartiella
)
robusta
, is separated from the new species from
Madagascar
by its slightly more slender palps (especially P2 and P4); a wider, crescent-shaped posterior genital sclerite (in
N.
(
Dartonia
)
nifymanana
it is small and straight); smaller dorsal platelets (
Fig. 41
); and slenderer distal segments of leg-IV as well as only one large sub-terminal seta on leg-IV-6 (
Fig. 42
).