Acrotritia tibetensis
- Dataset
- Acrotritia species (Acari: Oribatida: Euphthiracaridae) from China with description of a new species
- Rank
- SPECIES
- Published in
- Liu, Dong, Chen, Jun (2015): Acrotritia species (Acari: Oribatida: Euphthiracaridae) from China with description of a new species. Zootaxa 3937 (1): 127-146, DOI: 10.11646/zootaxa.3937.1.6
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Arachnida
- order
- Sarcoptiformes
- family
- Euphthiracaridae
- genus
- Acrotritia
- species
- Acrotritia tibetensis
description
Description. Measurements. Holotype: prodorsum: length 285, width 215, height 94, setae: ss 100, ro 50, in 120, le 61, ex 10, mutual distance: in – in 90, le – le 50, ro – ro 32; notogaster: length 600, width 405, height 420; c 1 75, c 2 75, c 3 75, c p 75, d 1 70, d 2 65, e 1 85, e 2 70, h 1 97, h 2 65, h 3 74, ps 1 85, ps 2 75, ps 3 70, mutual distance: c 1 – d 1 160, d 1 – e 1 185, e 1 – h 1 115, h 1 – ps 1 105; genito-aggenital plate 225 × 70, ano-adanal plate 284 × 90. One paratype: prodorsum: length 305, width 235, height 115; notogaster: length 700, width 445, height 460. Integument. Colour yellowish. Entire surface distinctly foveolate. Prodorsum (Figs. 1 A – C). One pair of strong lateral carinae present, with long forks at insertion level of lamellar setae; sensilla (ss) with narrow pedicel and flat, truncate head, covered with small spines; interlamellar setae (in) stout and erect, densely barbed in distal half; lamellar and rostral setae (le and ro) semi-erect and slightly thinner, sparsely barbed in distal half; comparative lengths: in – le / ro – le ≈ 1.2. Notogaster (Fig. 1 A). Notogastral setae fairly short (c 1 / c 1 – d 1 ≈ 0.47), sparsely barbed in distal half; setae c 2 further away from anterior border than setae c 1 and c 3; vestigial setae f 1 positioned anterior to setae h 1; openings of the lateral opisthosomal glands and lyrifissures positioned typically. Ventral region (Figs. 1 A, D). 9 pairs of genital setae (g) arranged with formula: 8: 1; 2 pairs of aggenital setae located longitudinally; anal, adanal setae (an and ad) and location of lyrifissures iad typical of genus. Legs (Figs. 1 E – H). Setal counts for leg segments: I: 1 - 3 - 4 (2) - 5 (1) - 17 (3); II: 1 - 3 - 3 (1) - 4 (1) - 13 (2), III: 2 - 2 - 3 (1) - 3 (1) - 11, IV: 2 - 1 - 2 - 2 (1) - 10; tarsi of legs I bidactylous, tarsi II – IV heterotridactylous.
diagnosis
Diagnosis. Entire surface distinctly foveolate; prodorsum with one pair of long lateral carinae, bifurcated at insertion level of lamellar setae; sensilla with flat and truncate head, covered with small spines; prodorsal and notogastral setae barbed in distal half, except exobothridial setae; vestigial setae f 1 positioned anterior to setae h 1; formula of genital setae: 8: 1; tarsi of legs I bidactylous, tarsi II – IV heterotridactylous.
discussion
Remarks. This new species is similar to Acrotritia vestita (Berlese, 1913), Acrotritia furcata (Bayoumi & Mahunka, 1979) and Acrotritia koreensis (Mahunka, 1997) with the presence of forked lateral carinae, but it differs from them by the following combination of features: 1) surface of body distinctly foveolate (versus punctate in A. vestita, and covered with polygonal sculpture in A. furcata and A. koreensis); 2) prodorsum with long lateral carinae bifurcated at insertion level of lamellar setae, length of bifurcated part of lateral carinae / length of lateral carinae is about 0.65 (versus lateral carinae shorter and bifurcated anterior to insertion level of lamellar setae in A. vestita (0.5), A. furcata (0.47 – 0.57) and A. koreensis (0.36 )); 3) lateral carinae bifurcated upward (versus downward in A. furcata and A. koreensis); 4) sensilla with flat and truncate head (versus with slightly swollen head in A. vestita) (Niedbała 2011). Compared with Acrotritia dikra (Niedbała & Schatz, 1996), this new species differs by the following features: 1) surface of body distinctly foveolate (versus punctate in A. dikra); 2) sensilla with flat and truncate head (versus setiform); 3) one pair of genital setae in progenital position (versus two pairs).
etymology
Etymology. The new specific name “ tibetensis ” refers to the type locality, Tibet.
materials_examined
Material examined. Holotype: adult (ZMCAS, in alcohol, CJ- 01 - 89), Tibet, Nyalam, Zhangmu, Youyiqiao, 1850 m a. s. l., from litter under broad-leaved tree, 2 Sep. 2001, leg. Jun Chen. Paratypes: 1 adult (ZMCAS, in alcohol, CJ- 01 - 90), 1860 m a. s. l., other data same as holotype; 1 adult (ZMCAS, in alcohol, CJ- 01 - 64), Tibet, Bowo, Tangmai, from litter under shrub, 24 Aug. 2001, leg. Jun Chen; 1 adult (ZMCAS, in alcohol, CJ- 01 - 93), Tibet, Nyalam, Zhangmu, near customs, 2200 m a. s. l., from litter under broad-leaved tree, 2 Sep. 2001, leg. Jun Chen.
Name
- Homonyms
- Acrotritia tibetensis