Water mite species of the genus Hydrodroma Koch (Acari: Hydrachnidia, Hydrodromidae) from Australia. Part II
Author
Pesic, Vladimir
Author
Smit, Harry
text
Zootaxa
2007
1509
41
50
journal article
10.5281/zenodo.177223
482ce760-15b3-4eb2-87ea-76ba0c0b02c9
1175-5326
177223
Hydrodroma wilesi
sp. nov.
(
Figs. 1
–
6
;
Tables 1
–
2
)
Type
series:
Holotype
: female, dissected and slide mounted in Hoyer's fluid, NORTHERN TERRITORY,
Kakadu
National Park, Helocrene near Gunlom Plunge Pool,
30.ix.2005
, 13°
25.17 S
132°
24.989 E
(
NTM
).
Paratypes
: one female (
NTM
), same data as
holotype
; Outlet Upper Pool, Edith Falls, Katherine Gorge NP,
30.vii.1994
, two males (
ZMAN
,
MNHP
), one of them dissected and slide mounted in Hoyer's fluid.
Diagnosis:
Characters of the genus
Hydrodroma
; the basic shape and setation of coxae, genital field and palp are similar to those found in
H. torrenticola
; 1
–
3 rather short swimming setae on anterior surface on III- L-5, number of swimming setae on III-L-4 1
–
2, on IV-L-5a 2
–
3 and on IV-L-5p 1, swimming setae are absent on the anterior surface of IV-L-5.
TABLE 1.
Morphometric data for the genital plate and palp for
H. wilesi
sp. nov.
(abbreviations: r = range, n = number of mites examined).
|
H. wilesi
|
| Male paratype |
Female holotype |
| genital acetabula, n |
41 |
52 |
| number of genital setae |
41-45 |
38 |
| genital plate length |
163 |
180 |
| ejaculatory complex |
164 |
- |
| length Μm P1 |
36 |
44 |
| P2 |
53 |
62 |
| P3 |
30 |
35 |
| P4 |
130 |
150 |
| P5 |
56 |
62 |
| Palp, total L |
305 |
353 |
| %P1 |
11.8 |
12.5 |
| %P2 |
17.4 |
17.6 |
| %P3 |
9.8 |
9.9 |
| %P4 |
42.6 |
42.5 |
| %P5 |
18.4 |
17.6 |
| W P-4 |
27 |
30 |
Description:
Female
(
holotype
, in parentheses some data for
paratype
): Length of idiosoma 1006 (1000), width 844 (831). Total number of coxal setae is 35 on coxae 1, 35
–
36 on coxae 2, 27 on coxae 3, 22 on coxae 4. Further details of genital plate morphology (
Fig. 2
) are given in
Table 1
. Gnathosoma: capitulum (
Fig. 5
)
182 in
length; chelicera total length 250, claw
50 in
length. Palps without diagnostic features, for chaetotaxy of the palp see
Fig. 4
(measurements in
Table 1
). Number of swimming setae on legs are presented in
Table 2
. Swimming setae on anterior surface on III-L-5 rather short.
Male
: Length of idiosoma 1180, width 675. Total number of coxal setae varies between 31
–
35 on coxae 1, 37
–
38 on coxae 2, 27
–
28 on coxae 3, 21
–
22 on coxae 4. Further details of genital plate morphology (
Fig. 3
) are given in
Table 1
. Gnathosoma: capitulum
172 in
length; chelicerae total length 170, claw
35 in
length. Palps without diagnostic features, for measurements of the palp see
Table 1
. Number of swimming setae on legs are presented in
Table 2
. Swimming setae on anterior surface on III-L-5 rather short.
TABLE 2.
Number of swimming setae for
H. wilesi
sp. nov
.
H.
w
ilesi
Male (n=2) Female (n=2)
II-L-5 posterior 0 0
III-L-4 posterior 2 1–2 III-L-5 posterior 1–2 rather short 1–3 rather short IV-L-4 anterior 2–3 2–3 IV-L-4 posterior 3–4 2–3 IV-L-5 anterior 0 0
IV-L-5 posterior 1 1
Remarks:
Hydrodroma wilesi
sp. nov.
is most similar to
H. tonapii
Cook (
India
)
and
H. reinhardi
Pesic (Mediterranean)
, in the presence of relatively few swimming setae on IV-L-4 and 5, the absence of swimming setae on the anterior side of IV-L-5 and presence of relatively large claws on the legs (
Fig. 6
).
H. wilesi
sp. nov.
differs from
H. reinhardi
(in parentheses data taken from
Pesic 2002
) in a lower number of swimming setae on II-IV-L (III-L-4 2
–
5, III-L-5 2
–
5, IV-L-4a 2
–
7, IV-L-4p 2
–
6, IV-L-5p 2
–
5), a shorter ejaculatory complex (164 vs.
180
–
210 in
H. reinhardi
) and rather shorter swimming setae on anterior surface on III-L-5.
H. tonapii
is distinguished by its relatively fewer setae on the coxal surfaces and presence of two swimming setae on posterior surface on IV-L-5 (see:
Cook 1967
and remarks under
H. tonapii
).
Etymology:
The species is named after Dr Roy Wiles (
UK
) in appreciation of his studies of the genus
Hydrodroma
.
Distribution:
Australia
(Northern Teritory).
Habitat:
helocrene spring and stream.