Khaustov, Alexander A. & Frolov, Andrey V., 2018, New taxa of pygmephoroid mites (Acari: Pygmephoroidea: Pygmephoridae, Neopygmephoridae) phoretic on Enoplotrupes sharpi (Coleoptera: Geotrupidae) from Thailand, Zootaxa 4442 (2), pp. 277-292: 283-285

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gen. nov.

Genus Nasutidania  gen. nov.

Type species: Nasutidania orientalis  sp. nov.

Diagnosis. FEMALE. Body oval. Gnathosomal capsule elongate, beak-like, its length almost three times longer than width, dorsally with two pairs of cheliceral setae (сha, сhb); postpalpal setae (pp) present; palps very long, with two pairs of dorsal setae (dFe, dGe). Palpal tibiotarsus without tibial claw and seta. Subcapitulum with one pair of setae m and round pits in posterior part; palps ventrally without accessory setigenous structure and solenidion; ventrolaterally with unusual oval depressions (dep). Rostrum of subcapitulum with several lateral short spiniform projections in distal half. Pharyngeal pumps tripartite, striated, situated closely to each other; pharyngeal pump 1 small, butterfly-like, pharyngeal pump 2 large, subrectangular and about three times longer than oval pump 3. Posterior margin of prodorsum slightly covered by anterior part of tergite C. Prodorsum with two pairs of simple setae (v 2, sс 2), pair of clavate trichobothria (sс 1) and small, round stigmata located just anteriorly to setae v 2. Dorsal idiosomal setae not modified. Tergite C with two pairs of setae (с 1, с 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 с); coxal fields IV with three pairs of setae (4 a, 4 b, 4 с). Pseudanal segment with three pairs of setae (ps 1-3). Ap1 and ap2 well developed and joined together and with appr, apsej well developed and joined with appr; ap3 very weak, linear, ap4 long, reaching distinctly 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 tripartite. Ags bell-like, pgs triangular, median genital sclerite (mgs) present. Ventral idiosomal setae not modified. Legs I and II subequal in length. Tibiotarsus I slightly thickened, with distinct claw directed laterally, situated on pretarsus; ventrodistal part of pretarsus with short and thick projection (fused unguinal setae); seta d of femur I hook-like, seta k long, pointed, seta-like. 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 ,, tс’, tс”, 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) (tс’, tс”, 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 (tс’, tс”, pl”, pv’, pv”, u’); leg IV: Tr 1 (v’), F 2 (d, v’), Ge 1 (v’), Ti 4(1) (d, l’, v’, v”, φ), Ta 6 (tс’, tс”, pl”, u’, pv’, pv”).

Differential diagnosis. The new genus is most similar to Xystrorostrum Mahunka  , 19681 by the presence of extremely long palps. The new genus differs from Xystrorostrum  by the tripartite posterior margin of posterior sternal plate (vs. entire in Xystrorostrum  ), presence of a well developed median genital sclerite (vs. absent in Xystrorostrum  ), absence of the secondary transverse apodeme (vs. present in Xystrorostrum  ), presence of lateral cuticular projections on the rostrum of the subcapitulum (vs. absent in Xystrorostrum  ), and absence of an accessory setigenous structure and palpal solenidion (vs. present in Xystrorostrum  ).

Species included. The genus Nasutidania  includes one species N. orientalis  sp. nov.

Distribution and habitats. Nasutidania orientalis  known only from the scarab beetles of the genus Enoplotrupes  in Thailand.

Etymology. The generic name is a combination of two words: Latin nasutus meaning nosed and dania, the second part of the generic name Bakerdania  , the most abundant neopygmephorid genus.