Scarabadania, Khaustov & Frolov, 2018

Khaustov, Alexander A. & Frolov, Andrey V., 2018, A new species, new genus and new records of heterostigmatic mites (Acari: Heterostigmata) phoretic on scarab beetles of the subfamily Orphninae (Coleoptera: Scarabaeidae), Zootaxa 4514 (2), pp. 181-201 : 196

Genus Scarabadania gen. nov.

Type species: Bakerdania tenuispina Sevastianov, 1974

Diagnosis. FEMALE. Gnathosoma of about equal length and width, dorsally with two pairs of setae (cha, chb) and pair of postpalpal setae (pp). Ventral gnathosoma with a pair of subcapitular setae m. Palps dorsally with only one pair of setae (probably dGe). Palps ventrally with mushroom-like ass and tiny solenidion. Palps terminated with small tibial claw. Pharyngeal pumps weakly striated and grouped together. Pharyngeal pumps 1 and 3 small, butterfly-like; pharyngeal pump 2 very long, about ten times longer than pump 1. Posterior margin of prodorsum slightly covered by anterior part of tergite C. Prodorsum with two pairs of simple setae (v 2, sc 2), pair of clavate trichobothria (sc 1) and small, round stigmata. Dorsal idiosomal setae not modified. Tergite C with two pairs of setae (c 1, c 2); tergite D with one pair of setae (d) and round cupules ia; tergite EF with two pairs of setae (e, f); tergite H with two pairs of setae (h 1, h 2) and round cupules ih. Coxal fields I with two pairs of setae (1 a, 1 b); coxal fields II with two pairs of setae (2 a, 2 b); coxal fields III with three pairs of setae (3 a, 3 b, 3 c); coxal fields IV with three pairs of setae (4 a, 4 b, 4 c). Pseudanal segment with three pairs of setae (ps 1-3). Ap1 and ap2 well developed and joined with appr, apsej well developed and joined with appr; ap3 very weak, linear, ap4 long, proceeding beyond bases of setae 3 b. Apodemes 5 vestigial, located near the bases of trochanters IV. Secondary transverse apodeme absent. Posterior margin of posterior sternal plate entire. Ags and pgs long and narrow, median genital sclerite absent. Ventral idiosomal setae not modified, relatively short. Legs I and II subequal in length. Tibiotarsus I distinctly thickened, with large claw, situated on short pretarsus; ventrodistal part of pretarsus with large and thick projection (fused unguinal setae); seta d of femur I hook-like, seta k long, pointed, seta-like. Setae tc’ and tc” situated on tip of large pinnaculum. Claws on tarsus IV simple, distinctly thinner than padded claws on tarsi II and III. Tarsus IV not strongly elongate. Femora III–IV divided into basi- and telofemur. Leg setation: leg I; Tr 1 (v’), Fe 3 (d, l’, v”), Ge 4 (l’, l”, v’, v”), TiTa 16(4) (d, l’, l”, v’, v”, k ,, tc’, tc”, p”, ft’, ft”, pv’, pv”, pl’, pl”, s, ω 1, ω 2, φ 1, φ 2); leg II: Tr 1 (v’), Fe 3 (d, l’, v”), Ge 3 (l’, l”, v’), Ti 4(1) (d, l’, v’, v”, φ), ta 6(1) (tc’, tc”, pl”, pv’, pv”, u’, ω); leg III: Tr 1 (v’), Fe 2 (d, v’), Ge 2 (l’, v’), Ti 4(1) (d, l’, v’, v”, φ), Ta 6 (tc’, tc”, pl”, pv’, pv”, u’); leg IV: Tr 1 (v’), Fe 2 (d, v’), Ge 1 (v’), Ti 4(1) (d, l’, v’, v”, φ), Ta 6 (tc’, tc”, pl”, u’, pv’, pv”).

MALE and LARVA unknown.

Differential diagnosis. The new genus is most similar to Bakerdania Sasa, 1961 by the absence of a median genital sclerite, entire posterior margin of the posterior sternal plate and the same idiosomal and leg setation. The new genus differs from Bakerdania by the presence of only one seta on the palpal femorogenu (vs. always two in Bakerdania and other described neopygmephorid genera), the long and narrow posterior genital sclerite (vs. usually short, triangular in Bakerdania ), and the presence of a large pinnaculum bearing setae tc’ and tc” on tibiotarsus I (vs. pinnaculum absent in Bakerdania ).

Species included. The genus Scarabadania includes one species S. tenuispina ( Sevastianov, 1974) comb. nov.

Etymology. The generic name is a combination of two words: Scaraba, the first part of the family name Scarabaeidae , and dania, the second part of the generic name Bakerdania , the most abundant neopygmephorid genus, and refers to the association of the new genus with scarab beetles.