Orfareptydeus stepheni, Ueckermann & Grout, 2007

Ueckermann, Edward A. & Grout, Timothy G., 2007, Tydeoid mites (Acari: Tydeidae, Edbakerellidae, Iolinidae) occurring on Citrus in southern Africa, Journal of Natural History 41 (37 - 40), pp. 2351-2378 : 2358-2360

publication ID

https://doi.org/ 10.1080/00222930701589921

persistent identifier

https://treatment.plazi.org/id/464587D1-8B45-FFD5-FE45-FD62FF72F9F5

treatment provided by

Carolina

scientific name

Orfareptydeus stepheni
status

sp. n.

Orfareptydeus stepheni sp. n.

( Figures 7–12 View Figures 7–12 )

Type material

South Africa: Limpopo Province: holotype female, 26 paratype females, three paratype males, and five paratype nymphs from Citrus sp., Letaba Estate near Tzaneen (23 ° 51.89S, 30 ° 19.19E), 13 February 2003, P. R. Stephen; five paratype females, one paratype male and one paratype tritonymph from Citrus sp. Bosveld Sitrus near Letsitele (23 ° 51.79S, 30 ° 26.19E), 13 February 2003, P. R. Stephen. Mpumalanga Province: one paratype female from Citrus sp., Lowveld Agricultural College, Nelspruit (25 ° 26.39S, 30 ° 58.89E), 14 August 2003, T. G. Grout. Eastern Cape Province: 17 paratype females, two paratype males, and two paratype tritonymphs from Citrus sp., farm near Addo, 22 September 2003, W. Kirkman. KwaZulu-Natal Province: 10 paratype females, one paratype male, and one paratype tritonymph from Citrus sp., Freeman farm, Nkwaleni Valley (28 ° 429S, 31 ° 379E), 30 January 2003, P. R. Stephen. Swaziland: 10 paratype females, four paratype males, four paratype tritonymphs, one paratype deutonymph and two paratype females from Citrus sp., IYSIS, Tshaneni, November 2002, P. R. Stephen. Zimbabwe: one paratype female from Citrus sp., west of Chegutu, Etheredge’s farm (18 ° 069S, 30 ° 08.79E), 6 August 2003, T. G. Grout.

Diagnosis

Adults. The features of this species are the same as those characterizing the genus. The leg chaetotaxy and epimeral formula are constant in all known stages (larva not seen) and appear to be a case of neoteny.

Female (n57). Dimensions of holotype followed (in parentheses) by variations in measurements of paratypes: length of idiosoma 337 (293–365), width 167; legs: I 173 (170–217), II 164 (151–192), III 158 (151–183), IV 201 (158–202); setae: υi 25 (22–25), υe 25 (19–25), sci 38 (35–38), sce 22 (19–25), c 1 25 (19–25, c 2 25 (19–25), d 1 25 (19–25), d 2 25 (19–25), e 1 25 (16–25), e 2 25 (16–25), f 1 25 (16–25), f 2 25(16–25), h 1 19 (16–22), ps 3 missing (19–22); cheliceral stylets 15 (13–14); palptarsus 19 (19–22).

Dorsum ( Figure 7 View Figures 7–12 ): all 13 pairs of dorsal setae, except for υe and sci, spatulate ( Figure 8 View Figures 7–12 ). Setae sci longest and slender along entire length, others equal to subequal in length. Prodorsum has four pairs of setae, opisthosoma nine pairs and three pairs of cupules, ip apparently absent. Striae with small tubercles, longitudinal on propodosoma and transverse medially on opisthosoma.

Venter ( Figure 9 View Figures 7–12 ): epimeral formula 3-1-3-2. Genital area with four pairs of aggenital and genital setae and no eugenital setae. Only one pair of anal setae (ps) present and paraproctal suckers well developed. Cupule ih lateral to paraproctal suckers.

Gnathosoma ( Figure 10 View Figures 7–12 ): palp chaetotaxy (tibiotarsus to femur): 6(ω)-2-2. Setae pζ and perhaps l 0 slightly forked distally, setae ba and solenidion ω minute.

Legs ( Figures 11, 12 View Figures 7–12 ): chaetotaxy of leg segments: tarsi 8(ω)-6-5-5, tibiae 4-2-2-2, genua 3-2-1-1, femora 2-1-0-0, trochantera 1-0-0-0. Femur IV entire. All tarsi terminate in two claws and a hairy empodium. Coxa I with coxal organ.

Male (n53). Dimensions: length of idiosoma (including gnathosoma) 290–268, width 180–202; legs: I 173–179, II 152–165, III 157–161, IV 164–176; setae: υi 19–22, υe 20–22, sci 28–35, sce 19–22, c 1 19–22, c 2 19–20, d 1 22, d 2 19–22, e 1 19, e 2 19, f 1 19, f 2 18, h 1 16, ps 3 16; cheliceral stylets 13; palptarsus 19.

Similar to female but differs in that the genital area has four pairs of aggenital, genital, and eugenital setae. Paraproctal suckers well developed. Coxa I with coxal organ.

Tritonymph (n55). Dimensions: length of idiosoma (including gnathosoma) 221–280, width 151–208; legs: I 117–151, II 107–145, III 107–141, IV 113–148; setae: υi 16–22, υe 16–19, sci 28, sce 16–19, c 1 19–22, c 2 16–19, d 1 16–22, d 2 19–22, e 1 16–19, e 2 16–19, f 1 16– 19, f 2 16–19, h 1 13–16, ps 3 16; cheliceral stylets 9; palptarsus 13–16.

Tritonymph differs from adults by lacking the progenital aperture, represented by two pores, presence of four pairs of aggenital (four on one side and three on the other side in one of the specimens), two pairs of genital, and one pair of anal setae. Paraproctal suckers well developed. Coxa I with coxal organ.

Deutonymph (n51). Dimensions: length of idiosoma (including gnathosoma) 271, width 205; legs: I 135, II 120, III 117, IV 123; setae: υi 19, υe 19, sci 25, sce 19, c 1 19, c 2 19, d 1 19, d 2 16, e 1 16, e 2 16, f 1 16, f 2 16, h 1 16, ps 13; cheliceral stylets 9; palptarsus 16.

Deutonymph can be defined as having three pairs of aggenital, one pair of genital, one pair of anal setae, and two progenital pores. Paraproctal suckers well developed. Coxa I with coxal organ.

Protonymph (n52). Dimensions: length of idiosoma (including gnathosoma) 198–217, width 148–161; legs: I 107–113, II 85–98, III 104, IV 101–104; setae: υi 13–17, υe 16–17, sci 25, sce 16, c 1 16, c 2 16, d 1 13–16, d 2 13–16, e 1 13, e 2 13–16, f 1 13–16, f 2 13–16, h 1 13, ps 9–13; cheliceral stylets 9; palptarsus 16.

Protonymph can be distinguished by the presence of only two pairs of aggenital setae, one pair of progenital pores, and one pair of anal setae. Paraproctal suckers small but well developed. Coxa with coxal organ.

Etymology

This species is named after the collector of many of the specimens in this study, P. R. Stephen.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Prostigmata

Family

Tydeidae

Genus

Orfareptydeus