Indotritia (Indotritia) javensis ( Sellnick, 1923 )

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, Acarologia 55 (4), pp. 397-416 : 400-404

Indotritia (Indotritia) javensis ( Sellnick, 1923)

( Figures 2 and 3 )

Measurements — Specimens from Hainan Province ( Figs. 2A – H ): prodorsum: length 290 – 400, width 240 – 305, height 98 – 140, sensillus 125 – 165, setae: ro 60, in 110, le 75, distance between setae: ro – ro 40, in – in 95, le – le 230; notogaster: length 498 – 710, width 385 – 590, height 405 – 600; setae: c 1 125, c 2 125, c 3 125, c p 125, d 1 120, d 2 120, e 1 145, e 2 140, h 1 150, h 2 125, h 3 118, ps 1 145, ps 2 130, ps 3 90; distance between setae: c 1 – d 1 190, d 1 – e 1 220, e 1 – h 1 135, h 1 – ps 1 138; ventral region: genito-aggenital plate 195 × 140, ano-adanal plate 370 × 105.

Measurements — Specimens from Sichuan Province ( Figs. 3A – H ): prodorsum: length 405 – 455, width 305 – 370, height 150 – 160, sensillus 140 – 160, setae: ro 65 – 80, in 93 – 110, le 60 – 80, distance between setae: ro – ro 60, in – in 110, le – le 280; notogaster: length 750 – 930, width 545 – 670, height 570 – 705; setae: c 1 115, c 2 115, c 3 100, c p 100, d 1 110, d 2 100, e 1 115, e 2 103, h 1 110, h 2 118, h 3 100, ps 1 110, ps 2 110, ps 3 75; distance between setae: c 1 – d 1 200, d 1 – e 1 340, e 1 – h 1 220, h 1 – ps 1 175; ventral region: genito-aggenital plate 160 × 200 – 160 × 250, ano-adanal plate 375 × 105 – 425 × 105.

Prodorsum with two divergent lateral carinae on each side (specimens from Sichuan Province with lower ones thinner, and much shorter, parallel to upper ones); sensilli long, setiform and smooth; interlamellar and rostral setae robust and covered with small spines; lamellar setae smooth and much thinner than rostral and interlamellar setae; exobothridial setae vestigial. Notogastral setae relatively short (c 1 / c 1 – d 1 ≈ 0.7), curved, robust, covered with small spines, except setae c 3 and ps 3 smooth and thin; setae c 1 and c 2 remote from anterior border, setae c 3 near the border; vestigial setae f 1 ventral or anterior to setae h 1. Suture between genital and aggenital plates reaching beyond the level of setae g7; formula of genital setae 4:5; two or three pairs of aggenital setae, one pair of anal and three pairs of adanal setae present; lyrifissures iad situated laterally between setae ad 2 and ad 3. h> h – h. Setation of legs: 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 distinct triangular spine in anterodorsal end.

Material examined — ZMCAS: CHINA: Hainan Province: 1 adult (in alcohol, H94040106), Ledong Li Autonomous County, Jianfengling National Forest Park (18º41’48.4"N, 108º47’18.0"E), from litter, Apr., 1994, leg. Chong-Hui Liao ; 1 adult (in alcohol, LD-07-68), at same locality as H94040106, main peak, from litter under arbor forest, 1357M, 8 Aug., 2007, leg. Dong Liu ; 2 adults (in alcohol, LD-07-50), Changjiang Li Autonomous County, Bawangling National Nature Reserve (19º05’18.2"N, 109º11’18.4"E), from litter under Dacrydium pierrei, 1040 M, 3 Aug., 2007, leg. Dong Liu ; 1 adult (in alcohol, LD-07-105), Qiongzhong Li and Miao Autonomous County, Limu Mt. (19º10’36.5"N, 109º44’12.2"E), Qumu, from litter under Dacrydium pierrei , 820M, 18 Aug., 2007, leg. Dong Liu ; 2 adults (in alcohol, LD-07-112), Qiongzhong Li and Miao Autonomous County, Limu Mt. (19º10’54.2"N, 109º45’6.5"E), from litter under deadwood, 946M, 19 Aug., 2007, leg. Dong Liu ; 2 adults (in alcohol, LD-07-51), with same data as LD-07-50, from litter under pine forest. Fujian Province : 2 adults (in alcohol, W-89-33), Wuyi Mt., Guadun (27°44’52.25"N, 117°40’59.28"E), from deadwood, 30 Apr., 1989, leg. Hui-Fu Wang ; 2 adults (in alcohol, W-89- 70), Liancheng County, Quxi Town, Meihua Mt. (25°20’30.22"N, 116°49’19.25"E), from litter, 22 May, 1989, leg. Yun-Qi Cui ; 2 adults (in alcohol, W-93-18), Fuzhou City (26°4’27.43"N, 119°17’47.68"E), from litter, 29 Mar., 1991, leg. Fu-Sheng Huang. Sichuan Province: 4 adults (in alcohol, CJ-01-3), Kangding, Paomashan Mt. (30°2’30.85"N, 101°57’37.70"E), 2500 m a.s.l., from moss, 8 Aug., 2001, leg. Jun Chen.

Remarks — This species, with a semicosmopolitan distribution, has many variable features. Within the Chinese specimens, no differences were observed between specimens from Fujian and Hainan Province, whereas differences in various features were observed between these latter specimens and those collected in the Sichuan province: 1) shape of notogaster (rounded in specimens from Hainan and Fujian versus oblong in specimens from Sichuan);

2) shape of prodorsal lateral carinae (lower carinae long and divergent in Hainan and Fujian versus much shorter and nearly parallel in Sichuan);

3) distance between rostral setae (shorter in Hainan and Fujian versus longer in Sichuan);

4) number of aggenital setae (two pairs in Hainan and Fujian versus three pairs in Sichuan);

5) position of lyrifissures iad (at the middle level between setae ad 2 and ad 3 in Hainan and Fujian versus closer to setae ad 3 in Sichuan);

6) shape of anterodorsal spine on femur I (strong in Hainan and Fujian versus much smaller in Sichuan);

7) different size of body size (smaller in Hainan and Fujian versus larger in Sichuan). Although these specimens differ in several morphological features, these differences are supposed to be included in intraspecific variation.

Biological notes — According to my observations, this species is able to jump when they are touched.

Figures

FIGURE 2: Indotritia (Indotritia) javensis (Sellnick, 1923) (specimen from Hainan Province): A – lateral view of body (legs removed); B – prodorsum, dorsal view; C – ventral plate; D – mentum of infracapitulum; E-H – trochanter, femur, genu and tibia: E, leg I; F, leg II; G, leg III; H, leg IV. Scale bars: A – C, E – H = 100 µm; D = 50 µm.

FIGURE 3: Indotritia (Indotritia) javensis (Sellnick, 1923) (specimen from Sichuan Province): A – lateral view of body (legs removed); B – prodorsum, dorsal view; C – ventral plate; D – mentum of infracapitulum; E-H – trochanter, femur, genu and tibia: E, leg I; F, leg II; G, leg III; H, leg IV. Scale bars: A – C, E – H = 100 µm; D = 50 µm.