Odontacarus robbinsi Loomis and Spath 1969
Creators: name: Stekolnikov, Alexandr A.
name: Capek, Miroslav
name: Literák, Ivan
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Trombiculidae
Odontacarus
Odontacarus robbinsi

description: Odontacarus robbinsi Loomis and Spath, 1969
(Fig. 27)
Odontacarus robbinsi Loomis and Spath, 1969: 187, fig. 1.
Odontacarus (Odontacarus) robbinsi: Goff & Loomis 1977: 373; Hoffmann 1990: 180, fig. 148.
Diagnosis. SIF = 7B-B-3-2111.1000; fsp = 6.6.6; fCx = 2.1.1; fSt = 0.2; fPp = B/B/BNN; fSc: PL> AM> AL; Ip = 1238–1283; fD = 2H-[5-8]-8-10-8-6(7)-5; DS = 52–53; V = 49; NDV = 101–102. Cheliceral blade with 5 dorsal teeth; stigmata situated at base of gnathosoma, tracheae extend to caudal third of idiosoma; scutum nearly pentagonal, with pointed nasus on anterior margin and angulate posterior margin, with dense puncta; two AM at level of AL; sensilla flagelliform, with ca. 6 long branches in distal half, far anterior to level of PL (PSB—P-PL = 7–11 µm); onychotriches present; parasubterminala (z) branched; f 1 proximal to S 1, f 2 proximal to S 2; microgenuala II present; mastitarsala ciliated. Standard measurements of two examined specimens (ZIN 9004 and ZIN 9037): AW 64, 68; PW 84, 86; SB 27, 27; ASB 28, 35; PSB 29, 29; SD 57, 64; P-PL 18, 22; AA 12, 13; NL 16, 18; NW 8, 9; AP 35, 36; AM 39, 37; AL 36, 34; PL 55, 58; S -, 50; H 52, 56; D min 32, 32; D max 50, 41; V min 23, 25; V max 35, 40; pa 452, 430; pm 380, 371; pp 452, 437; Ip 1283, 1238; DS 52, 53; V 49, 49; NDV 101, 102; TaIIIL 119, 110; TaIIIW 16, 19.
Distribution. Mexico (Loomis & Spath 1969) and Paraguay (this study).
Hosts. Sceloporus zosteromus Cope (= S. magister zosteromus), S. licki Van Denburgh (= S. orcutti licki), Urosaurus nigricaudus (Cope) (Squamata: Phrynosomatidae) (Loomis & Spath 1969).
New host records: Coryphistera alaudina and Zonotrichia capensis.
Material examined. One larva (ZIN 9004) ex C. alaudina No PG 303, PARAGUAY: Teniente Agripino Enciso Nat. Park, 2 September 2012; 1 larva (ZIN 9037) ex Z. capensis, Tres Gigantes Biological Station, 6 September 2012.
Remarks. According to the original description, this species has 4 dorsal and 3 ventral teeth on the cheliceral blade. We did not observe ventral teeth, but recorded 5 dorsal teeth; insufficient sample size does not allow estimation of the reliability of this difference. The difference in the dorsal setal formula of idiosoma (10-8-6-10-8+27, according to the original description) was caused most probably by differently traced borders between setal rows; however, the total number of setae in our specimens is almost the same (NDV = 101–102 vs. 103). Branched parasubterminala (z) of this species was evidently treated by the authors of original description as a non-specialized seta and thus was omitted. We should note that there is no way to distinguish “branched subterminala” from “subterminala replaced with a non-specialized branched seta” by a morphological examination. Finally, our measurements of the scutum and setae are in good agreement with those given in the original description.
description: Published as part of Stekolnikov, Alexandr A., Capek, Miroslav & Literák, Ivan, 2022, New species and records of chiggers (Acariformes: Trombiculidae) from birds of the Neotropics, pp. 501-552 in Zootaxa 5141 (6) on pages 544-546, DOI: 10.11646/zootaxa.5141.6.1, http://zenodo.org/record/6598054