Cheyletidae, W.E.Leach, 1815

Ardeshir, Fariba, 2017, Cheyletid mites (Acari: Trombidiformes) in stored grains in Iran, Persian Journal of Acarology 6 (1), pp. 11-24 : 16-18

Key to the family Cheyletidae in stored grain in Iran (adapted from Bochkov et al. 2005)

1. Guard seta (ft) of solenidion ω1 on tarsi I lanceolate or fan-like ….…………….……..……….. 2

– Guard seta (ft) of solenidion ω1 on tarsi I filiform ……………...……………..…………..……. 3

2. Rostrum slightly narrower than rostral shield, rostral shield with straight anterior margin, peritrems arc-like …………………………………….………... N. iranica Fain & Ardeshir, 2000 ………………………..………….……………………..………..… ... Neoeucheyla Radford, 1950

– Rostrum about 2 times narrower than rostral shield, rostral shield with widely rounded anterior margin, peritremes arch-like with concave apex ......................................................... C. variegate …….………………………..…………………….……………………….. Culifella Volgin, 1969

3. Palpal tarsi with one comb-like eupathidia, acm and sul ………………... A.sollers (Kuzin, 1940) …………………………..…………………………………............ Acaropsellina Summers, 1976 …………………………………………..………………..… Acaropsellini Bochkov & Fain, 2001

– Palpal tarsi with two comb-like eupathidia, sul ………….………….………..……….…………. 4

4. Palpal femur with three-four setae, leg I moderately elongated, tibia I distinctly shorter than tarsus I, setae vs of tarsus I situated almost at the same level as solenidion ω 1 ……………...…. 5 ……..……………………………………………………….…………..… Cheyletini Leach, 1815

– Palpal femur with five setae, leg I extremely long, about 1.5 times longer than leg IV, tarsus and tibia subequal in length, setae vs of tarsus I situated distinctly anterior to solenidion ω 1 ……..…. …................................................................................................... C. lepidepterorum (Shaw, 1794) ……..……………………..…………………....… Cheletomorphini Bochkov & Oudemans, 2001 ………………………..…………………………..………….… Cheletomorpha Oudemans, 1904

5. Eyes present ……………………………………………………………………………….…… 12

– Eyes absent …………………………………………………………………………………….... 6

6. Tibia I with five setae and short solenidion, hysteronotal shield bearing 1–3 pairs of median setae or none, in the Iranian species, median setae of dorsal shield distinctly shorter than lateral setae, dorsal shields without reticulated ornamentation ………………………………………….……. 7 ……………………………………...……….....……….……………….. Cheyletus Latreille, 1797

– Tibia I with four setae and short solenidion, hysteronotal shield bearing four pairs of median setae, median setae fan-like, subequal in length to lateral setae, dorsal shields with distinct reticulate ornamentation …………………………………..……..… Z. reticulata ( Cunliffe, 1962) ….……………………………………………………………...…… Zachvatkiniola Volgin, 1969

7. Dorsal shields without median setae, guard seta (ft) of solenidion ω 1 on tarsus rudimentary ….. 8

– Dorsal shields with transparent flag-like or cloud-like median setae (sometimes indistinct) or broken), guard seta (ft) on tarsus I longer than solenidion ω 1 ……………………………..….... 9

8. Peritremes M-shaped, hysteronotal shield with three pairs of median setae .................................... …….................................................................................... Cheyletus trouessarti Oudemans, 1902

– Peritremes Π-shaped, hysteronotal shield with one pairs of median setae ....................................... ................................................................................................ Cheyletus carnifex Zachvatkin, 1935

9. Femur IV with one setae ………………………..……………………………..…………..…… 10

– Femur IV with two setae ………………………………….….. Cheyletus eruditus (Shrank, 1781)

10. Rostrum with a pair if triangular dorsolateral projection …………….…………………………… …………………………………..……..…..……. Cheyletus bidentatus Fan & Nadchatram, 1980

– Rostrum without a pair if triangular dorsolateral projection ………….…….…………………. 11

11. Propodonotal and hyteronotal shield subequal in length, distance between these shields less than 1/2 length of d2. Setae e2 situated far behind the anterior margin of hyteronotal shield …………. ……………………………………………………………… Cheyletus malayensis Cunliffe, 1962

– Propodonotal shield 1.5 times or longer than hyteronotal shield, distance between these shields and length of setae d2 almost subequal, setae e2 situated almost on anterior margin of hyteronotal shield.………………...……………...……… Cheyletus malaccensis Cunliffe, 1962

12. Palpal femur with three setae, genu with two setae, legs I subequal or longer than idiosoma .... 13 …………………………………………………………….……….…………. Nodele Muna, 1964

– Palpal femur with four setae, genu with one setae, legs I shorter than idiosoma …………….... 14 …..……………………………………………………………......…... Lepidocheyla Volgin, 1963

13. Hyteronotal shield unpaired, with pair of deep lateral incision between metapodosoma and opisthosoma, opisthosoma bluntly pointed posteriorly, pseudoanal setae ps3 situated dorsolaterally, above level of posterior margin of hysteronotal shield ……….. L. gracilis Volgin, 1963

– Palpal claws with single basal projection, lateral and median setae of dorsal shield thickened, rod-like, guard seta (ft) of tarsus I distinctly developed.………….…. N. calamondin Muna, 1964