Premicrodispus spinosus Hosseininaveh & Hajiqanbar & Talebi 2014, sp. nov.
Creators: name: Hosseininaveh, Farahnaz
name: Hajiqanbar, Hamidreza
name: Talebi, Ali Asghar
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Pygmephoridae
Premicrodispus
Premicrodispus spinosus

description: Premicrodispus spinosus Hosseininaveh & Hajiqanbar sp. nov.
(Figures 6–10)
Description
Female. Length of idiosoma 152 (152–156), width 80 (74–88).
Gnathosoma (Figure 8A,B). Gnathosomal capsule about twice as long as its width, dorsally with one pair of cheliceral setae ch 3 (3–3); ventrally with one pair of subcapitular seta su 5 (4–5); palps short, terminated to small tibial claw, and compressed to gnathosomal capsule, with two pairs of setae, dFe 3 (3–4) and dGe 4 (3–4), cheliceral stylets indiscernible; pharyngeal system (Figure 8C) with three pumps, pump 1 reduced, pump 2 the largest and striated, pump 3 small and rounded.
Idiosomal dorsum (Figure 6). Stigmata oval-shaped and situated in anterior part of prodorsal shield; all dorsal setae smooth and pointed except setae d, f and h 1, which are blunt-ended; prodorsal shield with one pair of capitate trichobothria and one pair of setae sc 2 19 (18–19); all tergites smooth, tergite C with two pairs of setae c 1 11 (11–13) and c 2 15 (13–15), setae c 2 longer than c 1, posterior border of tergite C with distinct median depression; tergite D with seta d 9 (9–10) and one pair of rhombic cupuli ia, posterior border of tergite D with distinct median depression; tergite EF with two pairs of setae e 10 (10–11) related to one thin apodeme and f 10 (10–11); tergite H with two pairs of setae h 1 10 (10–11), h 2 11(11–12) and one pair of rhombic cupuli ih. Distances between dorsal idiosomal setae: sc 2 – sc 2 26 (25–26), c 1 – c 1 25 (25–26), c 2 – c 2 57 (50–60), c 1 – c 2 17 (17–20), d–d 24 (24–26), e–e 41 (41–44), e–f 5 (5–6), f–f 31 (31–35), h 1 – h 1 12 (11–13), h 1 – h 2 12 (11–12), h 2 – h 2 36 (36–39).
Idiosomal venter (Figure 7). Ventral plates smooth; all ventral setae smooth and pointed; apodemes 1 and 2 reaching to appr, appr not reaching to apsej, apodemes 3 extending beyond bases of setae 3 a, apodemes 4 short and not reaching to bases of setae 3 b, apodemes 5 short; anterior border of poststernal plate convex and posterior border of poststernal plate tripartite; coxal field I with two pairs of setae 1 a 10 (9–10) and 1 b 10 (10–11); coxal field II with two pairs of setae 2 a 11 (11–12) and 2 b 14 (13– 15), 2 b longer than 2 a; coxal field III with three pairs of setae 3 a 10 (9–10), 3 b 7 (7–8) and 3 c 7 (7–10), 3 b and 3 c subequal and shorter than 3 a; coxal field IV with two pair of setae 4 b 8 (8–9) and 4 c 7 (7–8); pseudanal segment PS with three pairs of setae ps 1 11 (10–11), ps 2 6 (5–6) and ps 3 18 (16–18), ps 3 distinctly longer than ps 1 and ps 2.
Legs. Leg chaetotaxy as in previous species.
Leg I (Figure 9A). Tibiotarsus with solenidia ω 1 5 (4–5), ω 2 1 (1–2), φ 1 2 (1–2), and φ 2 4 (3–4), all finger shaped, ω 1 and φ 1 striated, with five eupathidial setae (p ″, ft ′, ft ″, tc ′, tc ″), setae tc ′ longest on leg I, setae pl ″ and pl ′ subequal, setae pv ′ longer than pv ″, setae v ″ longer than v ′, setae l ′ and l ″ subequal; genu with setae l ″, l ′, v ′ and v ″, all subequal; femur with setae d and v ″ subequal and both longer than l ′; trochanter with seta v ′.
Leg II (Figure 9B). Tarsus with solenidion ω 3 (2–3) finger shaped, pl ″ modified and spine-like, the rest of setae of the segment subequal; tibia with a small finger-shaped solenidion φ 2 (1–2), setae l ′ modified and spine-like, setae d longer than v ′ and v ″; genu with setae, l ″ and v ′ subequal and longer than l ′; femur with setae d longer than l ′ and v ″; trochanter with seta v ′.
Leg III (Figure 10A). Tarsus with modified and spine-like setae pl ″ and tc ′, setae tc ″ longest setae on the leg, setae pv ″ and pv ′ subequal and shorter than u ′; tibia with a small solenidion φ 2 (1–2) and setae d modified and spine-like, seta v ″ and v ′ subequal and longer than l ′; genu with setae l ′ and v ′ subequal; femur divided into basifemur and telofemur, setae d and l ′ inserted on telofemur, setae d longer than l ′; trochanter with seta v ′.
Leg IV (Figure 10B). Tarsus with subequal setae pl ″, pv ′ and pv ″, setae u ′ and tc ″ subequal, seta tc ′ longest on the segment; tibia with small solenidion φ 1 (1–1), seta d and v ′ subequal and longer than l ′ and v ″; genu with seta v ′ as long as femoral seta v ′; femur divided into basifemur and telofemur, setae d and v ′ inserted on telofemur, seta d longer than v ′; trochanter with seta v ′.
Male and larva unknown.
Differential diagnosis
The new species is readily distinguished from other species of the genus by some spine-like setae on tarsi and tibiae II and III. Other species of the genus Premicrodispus have unmodified setae on these segments. Disregarding this character, the new species is similar to Premicrodispus tenuisetus Khaustov, 2006 but differs from it by setae d blunt and not extending to posterior border of tergite D (seta d pointed and extending to posterior border of tergite D in P. tenuisetus) and setae f and h 1 blunt (setae f and h 1 pointed in P. tenuisetus).
Type material
Five females found in a vial containing the beetle Corticeus unicolor (Col: Tenebrionidae) in 75% ethanol. The host beetle was collected from oak trees in Naharkhoran forest, Golestan province, northern Iran, 36.46° N, 54.27° E, and altitude 450 m., coll. V. Rahiminejad, 30 July 2010.
Etymology
The species epithet refers to some spine-like setae on tarsi and tibiae II and III.
Key to subgenera and Palaearctic species of the genus Premicrodispus (females) (modified from Khaustov 2006)
1. Genu I with four setae, genu II with three setae ............................................... 2
- Genu I with three setae, genu II with one seta ..................................................... ............... subgenus Premicrodispulus, P. reductus Khaustov and Chydyrov, 2010
2. Coxal fields I with two pairs of setae, pharyngeal pump 2 much longer than pharyngeal pump 3 ..................................................... subgenus Premicrodispus 3
- Coxal fields I with one pair of setae, pharyngeal pump 2 distinctly shorter than pharyngeal pump 3 ............................................................................................... ............... subgenus Premicrodispoides, P. punctatus Khaustov and Maslov, 2013
3. Setae 4 a present ................................................................................................. 4
- Setae 4 a absent .................................................................................................. 8
4. Setae ps 2 present ....................................................... P. stenops (Mahunka, 1969)
- Setae ps 2 absent ................................................................................................. 5
5. Bases of setae f associated with well-developed apodeme ......................................................................................................................P. lineatus(Mahunka, 1986)
- Apodemes associated with bases of setae f absent ............................................. 6
6. Setae ps 1 distinctly longer than ps 3 ................................................................. .............................................. P. dzumaevi (Sevastianov and Chydyrov, 1991)
- Setae ps 1 and ps 3 subequal in length .................................................................. 7
7. Setae d distinctly longer than distance between their bases, bases of setae e without apodemes .............................................................. P. paramaevi sp. nov.
- Setae d distinctly shorter than distance between their bases, bases of setae e with apodemes ................................................................ P. parasilvestris (Rack, 1974)
8. Setae ps 2 present ................................................................................................ 9
- Setae ps 2 absent ............................................................................................... 12
9. Setae h 2 distinctly shorter than h 1 ......................................................................... ...................................... P. akermanae (Sevastianov and Zahida Al Douri, 1988)
- Setae h 2 subequal or longer than h 1 ................................................................. 10
10. Setae h 1 much shorter than h 2, pseudanal setae distinctly shorter than setae of posterior sternal plate ....................................................................................... ............................. P. subvarsoviensis (Mahunka and Zyromska-Rudska, 1975)
- Setae h 1 and h 2 subequal, pseudanal setae and setae of posterior sternal plate subequal ........................................................................................................... 11
11. Setae h 1, d and f blunt-ended, tarsi and tibiae II and III with spine-like setae...... ............................................................................................... P. spinosus sp. nov.
- Setae h 1, d and f pointed, tarsus and tibia III with setiform setae ….. ................. ................................................................................ P. tenuisetus Khaustov, 2006
12. Setae sc 2 and d subequal .................................................................................. 13
- Setae sc 2 distinctly longer than d ..................................................................... 16
13. Tergites C and D with distinct emarginations in central part ............................... ............................................................. P. incisus Khaustov and Chydyrov, 2010
- Tergites C and D without distinct emarginations in central part .................... 14
14. Setae ps 1 and ps 3 subequal in length ................................................................ 15
- Setae ps 3 distinctly longer than ps 1 ....................................................................... ................................................ P. heterocaudatus Khaustov and Chydyrov, 2010
15. Setae f short and distinctly not reaching to posterior margin of the body ........... ................................................................................ P. acutisetus Khaustov, 2009
- Setae f long and protruding the posterior margin of the body ............................. ........................................................................... P. longisetosus (Mahunka, 1970)
16. Setae ps 3 distinctly longer than ps 1 .................................................................. 17
- Setae ps 1 and ps 3 subequal in length ................................................................ 18
17. Tarsus III with well-developed solenidion ............................................................ ....................................................... P. paradoxus Khaustov and Chydyrov, 2010
- Tarsus III without well-developed solenidion ...... P. longicaudus Khaustov, 2006
18. Anterior margin of posterior sternal plate distinctly convex ............................ 19
- Anterior margin of posterior sternal plate straight .......................................... ......................................................................... P. kaliszewskii Khaustov, 2006
19. Bases of setae e associated with well-developed apodemes .............................. 20
- Apodemes associated with bases of setae e absent or vestigial ........................ 21
20. Setae sc 2 and c 1 subequal, setae c 2 and c 1 situated almost at the same level ........ ..................................................................................... P. rackae Khaustov, 2006
- Setae sc 2 distinctly longer than c 1, setae c 2 situated distinctly anterior to c 1 ........ ................................................................................ P. brevisetus Khaustov, 2006
21. Setae e shorter than setae f .............................................................................. 22
- Setae e longer than setae f .......................................... P. krczali Khaustov, 2006
22. Setae c 1 and e blunt ended .......... P. obtusisetosus Khaustov and Chydyrov, 2010
- Setae c 1 and e pointed ..................................................................................... 23
23. All dorsal setae long and barbed ....................... P. karadagensis Khaustov, 2009
- Dorsal setae short and usually smooth .................... P. montanus Khaustov, 2006
description: Published as part of Hosseininaveh, Farahnaz, Hajiqanbar, Hamidreza & Talebi, Ali Asghar, 2014, Two new species of the genus Premicrodispus (Acari: Microdispidae) associated with beetles (Coleoptera: Lucanidae: Tenebrionidae), with a key to Palaearctic species of the genus, pp. 915-931 in Journal of Natural History 49 (15) on pages 922-930, DOI: 10.1080/00222933.2014.953225, http://zenodo.org/record/4004698