Raphignathus evidus Fan, 2000

Hatami, Parisa, Jafari, Shahriar & Ahmad-Hosseini, Mohammad, 2024, Some raphignathoid mites (Acariformes: Trombidiformes: Prostigmata) in Lorestan Province, with re-description of Raphignathus evidus Fan as a new record from Iran, Persian Journal of Acarology 13 (1), pp. 77-92 : 86-89

Raphignathus evidus Fan, 2000 ( Figs. 1–8 )

Raphignathus evidus Fan – Fan and Yin (2000): 94; Beron (2020): 124.

Diagnosis (female)

Median prodorsal shield almost smooth; lateral prodorsal shields with 2 setae, setae c2 situates on membrane; without small shields behind prodorsal shield; interscutal membrane with three pairs of setae; opisthosomal shield reduced with two pairs of setae (h1 and h2); palp femur with 2 setae; leg femora I-IV 6-5-3-3; tarsi I-IV 19(+ ω 1+ ω2) - 15(+ ω)-13(+ ω)-13.

Female (n = 1) – Idiosoma oval, length of body (including gnathosoma) 625, (excluding gnathosoma) 445, width of body 280 at level of setae d1.

Dorsum ( Fig. 1 ) – Prodorsum covered by one median shield with three pairs of setae (v1, v2 and c1) and two reduced lateral shields with two pairs of setae sc1 and sc2 (setae c2 located on the membrane) and one pair of eyes. Interscutal membrane with three pairs of setae (d1, e1 and f1) and three pairs of cupules (ia, im and ip). Opisthosomal shield obviously reduced with two pairs of setae (h1 and h2); setae h3 situated on membrane. All dorsal shields without vacuoles. Dorsal setae simple, lengths of dorsal setae as follows: v1 44, v2 43, sc1 43, sc2 42, c1 45, c 2 40, d1 41, e1 39, f1 42, h1 37, h2 35, h3 33. Distances between dorsal setae: v1–v1 13, v1–v 2 47, v2–v2 48, v2–sc1 41, v2– sc2 65, sc1–sc1 130, sc1–sc2 30, sc1–c1 95, sc2–sc2 173, sc2–c1 90, c1–c1 16, c1–c2 70, c2–c2 140, c1–d1 65, d1–d1 68, d1–e1 77, e1–e1 75, e1–f1 68, f1–f1 50, f1–h1 50, h1–h1 17, h1–h2 23, h1–h3 40, h2–h2 41, h2–h3 23, h3–h3 87.

Venter ( Fig. 2 ) – Ventral cuticle striated; coxae I–IV smooth and without endopodal shields; aggenital plate with two pairs of setae (ag1 –2), genital plate with three pairs of setae (g1 –3). Anal opening dorsoventrally, with three pairs of setae (ps1 –3), ps1 dorsally and ps2–ps3 ventrally; one pair of cupules (ih) located laterally to genital shields. Length of ventral setae: 1a 40, 1b 38, 1c 37, 2b 35, 2c 32, 3a 37, 3b 34, 3c 32, 4a 35, 4c 37, ag1 32, ag2 27, g1 22, g2 23, g3 22, ps1 16, ps2 19, ps3 18. Distances between ventral setae: 4a–4a 45, ag–ag1 85, ag1–ag2 73, ag2–ag2 65, ag2–g1 45, g1–g1 22, g1–g2 20, g2–g2 37, g2–g3 10, g3–g3 25, ps1–ps1 25, ps2–ps2 23, ps3–ps3 18.

Gnathosoma ( Figs. 3, 4 ) – Subcapitulum smooth with two pairs of subcapitular setae m 41, n 37 and two pairs of adoral setae or1 13, or2 15; stylophore conical 60 long with vertical striation, movable digit 38 long ( Fig. 4 ). Palp five-segmented, palp chaetotaxy from trochanter to tarsus: 0, 2, 2, 3+1claw, 4+1 ω +4 eupathidia ( Fig. 3 ).

Legs ( Figs. 5–8 ) – Legs measurements from trochanter to tarsus (including pretarsus): leg I 365; leg II 305; leg III 350, leg IV 400; setal formulae of leg segments (solenidia in parentheses and not included in setal counts) as follows: coxae 2-2-2-1; trochanters 1-1-2-1; femora 6-5-3-3; genua 5(+ κ)-5(+ κ)-4-4; tibiae 5(+ φ,)-5(+ φp)-5(+ φp)-4(+ φp); tarsi 19(+ ω1,+ ω2) - 15(+ ω)-13(+ ω)-13. Length of solenidia: I κ 5, I φ 15, II φρ 13, III φρ 10, IV φρ 10, I ω1 11, I ω2 7, II ω 5, III ω 3.

Male and immature stages – Unknown.

Remarks

This re-description resembles the original description of this species from China by Fan and Yin (2000) in having same chaetotaxy for palp and legs as well as similar dorsal shields. However, it differs by: length of dorsal setae 35 to 45, median prodorsal shield almost smooth, setae h1 is far away from anterior margin of opisthosomal shield, coxae I–IV without endopodal shields in the Iranian specimen, oppose to length of dorsal setae 23 to 31, median prodorsal shield almost stippled, seta h1 close to anterior margin of opisthosomal shield, endopodal shields present around coxae III and IV in the Chinese specimen.

Material examined

One female collected from soil in rice field Oryza sativa ( Poaceae ), Qaleh Sangi village (33° 34' N, 48° 18' E), 28 August 2020, Lorestan province, Iran; by Parisa Hatami. The specimen is deposited in the mite collection of the Acarology Laboratory of the Lorestan University, Lorestan, Iran.

Figures

Figures 1–4.Raphignathus evidus Fan (Female) – 1. Dorsal view of idiosoma; 2. Ventral view of idiosoma; 3. Palp; 4. Chelicerae.

Figures 5–8. Raphignathus evidus Fan (Female) – 5. Leg I; 6. Leg II; 7. Leg III; 8. Leg IV.