Two new chigger mites of the genus Aboriginesia (Acari: Trombiculidae)
Author
Kováčik, Ján
Ninmica 172, 020 01 Slovak Republic
Author
Kalúz, Stanislav
Institute of Zoology, Slovak Academy of Sciences, Dúbravská cesta 9, 845 06 Bratislava, Slovak Republic.
text
Zootaxa
2010
2010-07-30
2554
1
23
36
https://biotaxa.org/Zootaxa/article/view/zootaxa.2554.1.2
journal article
10.11646/zootaxa.2554.1.2
1175-5326
5303641
Aboriginesia obuchi
,
new species
Description:
Larva. SIF = 7B-S-N-3-2 -1-1-1-1-0-0-0; fsp=7-7-7; fPp = B-B-N.N.B; Ga = N; fCx = 1-1-1; fSt = 2-2; Number of dorsal setae (holotype-minimal-mean-maximal-standard deviation)(n = 3): DS = 69-51-60- 69-9; VS = 44-44-47-49-2,65; NDV = 113-100-107-113-6,56; fDS = 4H-14(15)-9(13)-11(7)-4(6)-9(4)-6(2)- 6(0)-4(0)-2(0) = 69(51);
Dorsum
(
Fig. 6
). Scutum anteriorly and laterally subquadrate, posteriorly semirounded, slightly wider than long, with AL, AM, PL, PPL and two sensillae. Small scutal puncta cover prevailing part of scutum. Sensilla ciliated, with 3–4 longer lateral cilia situated in second half of sensilla. Sensilla 65–69 long. Oval eyes (2 + 2) in ocular plates, eyes laterally at the level of PL. Humeral setae 77–86 µm long, dorsal anterior 62–69 and posterior setae 62–74 µm long, thickly ciliated, dorsal setae arranged in irregular rows, rows varying in number and also in position of setae.
Scutum
. (
Tab. 3
). PL>AM=AL; SB<ASB>PSB; SD<AW<PW; SB situated anteriorly to the level of PL and PPL.
TABLE 3
.
Aboriginesia obuchi
sp. n.
—measurements of scutum (n = 3).
| Holotype |
Minimal |
Mean |
Maximal |
Standard deviation |
| AW |
65 |
65 |
68.3 |
71 |
1.89 |
| PW |
75 |
75 |
83 |
92 |
6.36 |
| PPW |
57 |
55 |
56.3 |
57 |
0.47 |
| SB |
26 |
26 |
26 |
26 |
0 |
| ASB |
28 |
26 |
28 |
30 |
1.41 |
| PSB |
22 |
22 |
23.3 |
25 |
0.24 |
| SD |
50 |
50 |
51.3 |
53 |
1.18 |
| AP |
29 |
28 |
29.3 |
31 |
1.18 |
| AM |
38 |
34 |
35.3 |
38 |
0.94 |
| AL |
34 |
34 |
36.7 |
38 |
0.94 |
| PL |
49 |
46 |
47.7 |
49 |
0.24 |
| PPL |
48 |
41 |
43.7 |
48 |
1.89 |
| Sensilla (length) |
69 |
65 |
67 |
69 |
2.83 |
Venter
(
Fig. 7
). Two pairs of sternal setae, each coxa with 1 seta. Ventral side generally with 44–49 irregularly arranged thickly ciliated setae, 24 of them situated anteriorly from anal opening. Anterior setae shorter to caudal. Lengths of ventral setae vary and increase from anterior (36–42) to median (34–45) and posterior setae (55–62) µm long.
Gnathosoma
(
Fig. 8
). Galeala nude. Palps 72–83 µm long, 3-pronged palpotibial claw slender, 20–26 µm long, with deeply indented prongs. Chelicera of normal contour, anteriorly with usual tricuspid cup.
Legs
(
Figs. 9–10
). With pretarsus, claws and normal empodia. All setae on legs ciliated, slender, relatively short. Specialized setae on leg segments: Leg I - S
1
, f
1
, (PT´, ST, pST) = N, 2 tibialae, 1 microtibiala, 2 genualae, 1 microgenuala; Leg II - S
2
, f
2
, PT´´= N, 2 tibialae, 1 genuala; Leg III -1 tibiala, 1 genuala, 1 MTa. Number of ciliated setae on leg segments (leg formula): Leg I: Cx (1) - Tr (1) - Bf (1) - Tf (5) - G (4) - Ti (6) - Ta (19); Leg II: Cx (1) - Tr (1) - Bf (2) - Tf (4) - G (4) - Ti (6) - Ta (14); Leg III: Cx (1) - Tr (1) - Bf (1) - Tf (2) - G (3) - Ti (6) - Ta (14). Leg measurements are presented in
Table 4
.
Differential diagnosis:
Aboriginesia obuchi
sp. n.
belongs to the group of
Aboriginesia
species
with two genualae I, fSt = 2-2, two pairs of humeral setae (4H) and nude galeala. The related species
Aboriginesia iberica
(Schluger)
, widely distributed in Caucasus, differs from
A. obuchi
sp. n.
having three genualae I, barbed galeala and the position of SB anteriorly to the level of PL and PPL.
A. obuchi
sp. n.
differs from the similar
A. tschatkalica
(Hushcha & Kharadov)
in having fPp = B-B-N.N.B and two pairs of humeral setae (4H), while
A. tschatkalica
has fPp = B-B-B.B.B and one pair of humeral setae (2H). Two other very close species
A. tarda
(Schluger)
and
A. monticola
(Kolebinova)
differ from
A. obuchi
sp. n.
having three genualae I, two humerals only (2H) and other numbers of dorsal and ventral setae.
A. monticola
has also a different shape of scutum. The remaining
Aboriginesia
species
show other combinations of features.
FIGURE 6.
Aboriginesia obuchi
sp. n.
–– idiosoma dorsal.
FIGURE 7.
Aboriginesia obuchi
sp. n.
–– idiosoma ventral.
FIGURE 8.
Aboriginesia obuchi
sp. n.
–– chelicera, palps (A— ventral, B—dorsal).
TABLE 4
.
Aboriginesia obuchi
sp. n.
—length of legs (n = 3).
| Holotype |
Minimal |
Mean |
Maximal |
Standard deviation |
| leg I |
307 |
297 |
303.7 |
307 |
5.03 |
| leg II |
276 |
272 |
287 |
313 |
22.61 |
| leg III |
322 |
304 |
315.7 |
322 |
10.12 |
| Ip |
905 |
890 |
904.3 |
918 |
14.01 |
Etymology
: The species is named in honour of Dipl. Ing. Jan Obuch from Povazske muzeum Zilina - Krasnany,
Slovakia
, who provided the authors with the mite material from Caucasus.
Material studied.
Holotype
:
1 larva
,
Caucasus Mts.
,
Elbrus
Mt.
North-East
,
Baksan
walley,
Azau village
,
N 43°26´
,
E 42°58´
,
10.– 16. 8. 1982
on adult female of
Chionomys gud
; collected by
J. Obuch.
Paratypes
:
2 larvae
on adult female of
Chionomys gud
, with same collecting data.
Holotype
(accession number SZ 6942) is deposited in Slovak National Museum, Bratislava,
Slovakia
; the
paratypes
in the collections of authors
.