Bostocktrachys thailandica, Jenő Kontschán & Géza Ripka, 2017

Jenő Kontschán & Géza Ripka, 2017, Trachyuropodid mites (Acari: Uropodina) from South-East Asia: catalog, new key and description of two new species, Revue suisse de Zoologie 124 (1), pp. 73-82 : 76-79

publication ID	https://doi.org/ 10.5281/zenodo.322667
DOI	https://doi.org/10.5281/zenodo.6023557
persistent identifier	https://treatment.plazi.org/id/03AE1F14-FFDA-FF88-7901-41C88C1FFD6F
treatment provided by	Plazi
scientific name	Bostocktrachys thailandica
status	sp. nov.

Treatment

Bostocktrachys thailandica sp. nov.

Figs 15-27 View Figs 15 - 21 View Figs 22 - 27

Holotype: MHNG, sample 24-Th-79; female; Thailand, Bangkok, soil sample from base of tree; Berleseextraction in Geneva ; 17.VIII.1979; leg. J. Robert.

Paratypes: MHNG; two females and one male with same data as for holotype.

Diagnosis: Distinguished from the other congeneric species by most of dorsal setae smooth and spiniform. Anterior margin of furrow borders wide, elevated area with strongly sclerotized and V-shaped posterior margin. Anterior parts of elevated area forming one pair of L-shaped, strongly sclerotized structures with deep pits at their corners. Deep horizontal furrow bordered in posterior part with a wide U-shaped sclerotized area. Only Bostocktrachys tuberculata has similar strongly sclerotized dorsal structures. In B. tuberculata the elevated area posterior to the furrow is rounded and narrower than the elevated area anterior to the furrow, whereas in the new species it is quadrangular and as wide as the elevated area anterior to the furrow. The posterior margin of the elevated area anterior to the transversal furrow also differs: it is straight in B. tuberculata , but slightly bent in the new species.

Description of female: Length of idiosoma 1065-1120, width 700-795 (n=3). Shape oval, with vertex slightly elongated, posterior margin rounded. Color reddish brown.

Dorsal idiosoma ( Fig. 15 View Figs 15 - 21 ): Dorsal and marginal shields fused anteriorly. Dorsal shield neotrichous, majority of dorsal setae spiniform (about 32-44 long), some of them pilose, others smooth. Surface of dorsal shield with oval pits and bearing numerous strongly sclerotized structures. A deep transversal furrow situated in central area of dorsal shield. One pair of strongly sclerotized rings visible at lateral ends of furrow. Anterior margin of furrow borders forming a wide and elevated area with strongly sclerotized and V-shaped posterior margin. Anterior parts of elevated area forming one pair of L-shaped, strongly sclerotized structures with deep pits at their corners. Deep transversal furrow bordered in posterior part by a wide U-shaped sclerotized area bearing pilose setae on margins and smooth setae in central area. Numerous C-shaped humps situated close to lateral and caudal margins of dorsal shield, these humps bearing smooth setae. Marginal shield without sculptural pattern and bearing spiniform setae (about 33-42 long). Ventral idiosoma ( Fig. 16 View Figs 15 - 21 ): Tritosternum with narrow and oval basis; laciniae with two smooth inner and two apically pilose outer branches ( Fig. 17 View Figs 15 - 21 ). Sternal shield without sculptural pattern. First three pairs of sternal setae serrate, others smooth and needle-like, all sternal setae short (about 18-21 in length). Numerous setae visible close to coxae IV. One pair of lyriform fissures situated close to anterior margin of sternal shield, another pair situated in central area of sternal shield, a third pair at level of posterior margin of coxae III and a fourth pair at level of central area of coxae IV. Genital shield scutiform (about 260-270 long and 170-180 wide), its surface with oval pits ( Fig. 22 View Figs 22 - 27 ). Ventral shield ornamented with oval pits, bearing smooth and needle-like setae, shape similar to sternal setae but longer (about 30-36). Numerous setae situated in a transversal row posterior to coxae IV; in central section of each row one pair of humps carrying numerous setae. Similar humps with setae situated close to caudal margin of ventral idiosoma. Anal opening situated in a drop-shaped area bearing four setae similar in shape and length to other ventral setae plus one pair of lyriform fissures. Stigmata situated between coxae II and III. Prestigmatic part of peritremes long and hookshaped, poststigmatic part short. Pedofossae deep, their surface smooth.

Gnathosoma ( Fig. 18 View Figs 15 - 21 ): Corniculi horn-like, internal malae longer than corniculi and divided into four fringed branches. Hypostomal setae h1 short (about 25-27 in length) and smooth, h2 and h4 apically bifurcated, h2 smooth, h3 and h4 marginally serrate, h2 and h4 short (about 45-55), h3 long (about 75-80), h3 situated close to h2. Palpal trochanter with one short and smooth, and one long and serrate ventral seta. Other setae on palp smooth and needle-like, except for one pilose seta on dorsal side of femur ( Fig. 21 View Figs 15 - 21 ). Epistome subtriangular and strongly serrate on lateral margins ( Fig. 19 View Figs 15 - 21 ). Chelicerae with one tooth each on movable and fixed digit, fixed digit longer than movable digit, pilus dentilus absent, internal sclerotized node and one dorsal seta present ( Fig. 20 View Figs 15 - 21 ). Legs ( Figs 23-26 View Figs 22 - 27 ): Leg I 460-465 long, leg II 400-410, leg III 420-430, leg IV 460-465. Legs I-IV each with a pair of claws at tip of ambulacral process, claws of legs I smallest. Most setae on legs needle-like, some robust and serrate setae situated on all legs. Flap-like processes on femora II-IV.

Description of male: Length of idiosoma 1120, width 745 (n=1). Shape same as in females.

Dorsal idiosoma: Ornamentation and chaetotaxy of dorsal shield as in female.

Ventral idiosoma: Ornamentation and chaetotaxy of ventral shield as in female. Sternal shield without sculptural pattern ( Fig. 27 View Figs 22 - 27 ). Sternal setae smooth and needle-like (about 17-20 long), situated close to margins of sternal shield and around genital opening ( Fig. 27 View Figs 22 - 27 ). Genital shield rounded (about 47× 50 in dimension) and situated between coxae III-IV. Other characters as in female.

Nymph and larva unknown.

Etymology: The name of the new species refers to the country where the type specimens were collected.