Indotritia (Indotritia) tumenensis Liu 2015, n. sp.
Creators: name: Liu, D.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Oribotritiidae
Indotritia
Indotritia tumenensis

description: Indotritia (Indotritia) tumenensis n. sp.
(Figure 1)
Diagnosis — Prodorsum with one pair of long lateral carinae; sensilli club-like, with slightly obtuse apex; interlamellar, rostral and notogastral setae robust, erect and sparsely covered with small spines; lamellar setae procumbent and thinner; exobothridial setae vestigial; vestigial setae f 1 situated anterior to setae h 1; ano-genital cleft short; formula of genital setae 5:4; ag 2> ag 1; two pairs of anal and two pairs of adanal setae; lyrifissures iad situated laterally between setae ad 2 and an 2; femur I with strong triangular spine in anterodorsal end.
Description — Measurement of holotype: prodorsum: length 275, width 208, height 95, setae: ss 55, ro 52, in 75, le 46; notogaster: length 545, width 350, height 440; c 1 87, d 1 90, e 1 85, h 1 90, ps 1 88 genito-aggenital plate 152 × 90, ano-adanal plate 260 × 65. Range of variations for measurements of paratypes: prodorsum: length 270 – 295, width 205 – 215, height 92 – 100; notogaster: length 555 – 575, width 360 – 365, height 450 – 465.
Integument — Colour brown. Integument finely dotted, anterior part of prodorsum with longitudinal striations.
Prodorsum — One pair of long and strong lateral carinae present; sensilli (ss) rough and club-like, with slightly obtuse apex; interlamellar setae (in) strongly erect, robust, sparsely covered with small spines; rostral setae (ro) semi-erect, sparsely covered with small spines, slightly thinner than interlamellar setae; lamellar setae (le) smooth, procumbent, much thinner than rostral and interlamellar setae; exobothridial setae (ex) vestigial; comparative lengths: in> ss> ro> le, in -in / ro -ro ≈ 2.1.
Notogaster — Notogastral setae relatively short (c 1 / c 1 - d 1 ≈ 0.6), curved, robust, sparsely covered with small spines; setae c 1 and c 2 remote from anterior border, setae c 3 near the border; vestigial setae f 1 situated anterior to setae h 1.
Ventral region — Suture between genital and aggenital plates reaching the level of setae g 7; nine pairs of genital setae (g) present, among which four pairs in progenital position; two pairs of aggenital setae (ag), setae ag 2 longer than ag 1; ano-genital cleft short; two pairs of short anal setae (an) and two pairs of adanal setae (ad) present; lyrifissures iad situated laterally between setae ad 2 and an 2.
Legs — Setal counts for leg segments: I: 1-4-5(2)- 5(1)-22(3); II: 1-4-4(1)-3(1)-19(2), III: 3-2-3(1)-3(1)-14, IV: 3-2-2(1)-3(1)-11; femur I with strong triangular spine in anterodorsal end.
Material examined — Holotype: 1 adult (NIGA, in alcohol), China: Jilin Province, Yabian, Tumen, from litter near border of China and North Korea, 4 Apr. 2015, leg. Dong Liu and Yuting Huang. Paratypes: 3 adults (NIGA, in alcohol), same data as holotype.
Etymology — The new specific name " tumenensis " refers to the type locality Tumen in Jilin Province, China.
Remarks — This new species is distinguished from all congeneric species with two pairs of anal and two pairs of adanal setae and by the shape of sensilli (swollen and club-like versus thin and setiform in other species).
In this genus, only three species, I. (I.) lanceolata, I. (I.) nunomurai and I. (I.) clavata, have swollen sensilli. Compared with I. (I.) lanceolata and I. (I.) nunomurai, this new species differs by following combination of features:
1) sensilli with slightly obtuse apex (versus with sharp pointed apex in I. (I.) lanceolata, with thin and long apex in I. (I.) nunomurai);
2) one pair of prodorsal lateral carinae present (versus two pairs in I. (I.) lanceolata and I. (I.) nunomurai); 3) two pairs of anal setae (versus one pair);
4) two pairs of adanal setae (versus three pairs).
The new species is distinguished from I. (I.) clavata by
1) sensilli longer (in> ss> ro> le) and clublike (versus short (ro> le = in> ss) and fusiform in I. (I.) clavata);
2) exobothridial setae vestigial (versus not vestigial);
3) two pairs of anal and two pairs of adanal setae present (versus one pair of anal and three pairs of adanal setae);
4) formula of genital setae 5:4 (versus 4:5).
description: Published as part of Liu, D., 2015, Review of Indotritia (Acari, Oribatida, Oribotritiidae) with a world checklist, a key to all known species, and a description of a new species from China, pp. 397-416 in Acarologia 55 (4) on pages 398-400, DOI: 10.1051/acarologia/20152179, http://zenodo.org/record/4640162