Bostocktrachys surinensis, 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 : 74-76

Bostocktrachys surinensis sp. nov.

Figs 1-14

Holotype: MHNG, sample TL-15/09; female; Thailand, Surin Province & District , mixed evergreen-deciduous forest near prison, 14°52’36”N, 103°27’24”E, 150 m, 9.VII.2014; leg. P. Schwendinger.

Paratypes: MHNG; two females and two males with same data as for the holotype .

Diagnosis: Distinguished from the other two known Bostocktrachys species by smooth and spiniform dorsal setae, except for five pairs of short and apically pilose setae situated close to posterior margin of dorsal shield. Four vertical grooves with a strongly sclerotized horizontal crossbar situated posterior to horizontal furrow. Surface of genital shield of female smooth. Position and shape of strongly sclerotized dorsal grooves and humps unique within the genus Bostocktrachys. Only one species in this genus ( B. micherdzinskii ) has short apically serrate caudal setae. Beside the dorsal characters, the most important differences between these two species is the sculptural pattern of the female genital shield, which is smooth in the new species and ornamented with oval pits in B. micherdzinskii .

Description of female: Length of idiosoma 1000, width 700. Shape oval, with vertex slightly elongated; posterior margin rounded. Color reddish brown.

Dorsal idiosoma ( Fig. 1 ): Dorsal and marginal shields fused anteriorly. Dorsal shield neotrichous, majority of dorsal setae spiniform (about 21-27 long) some of them pilose, others smooth ( Figs 2-3 ). Ten short (about 8-10 long) and apically pilose setae in four groups (2-3-3-2) situated close to caudal margin of dorsal shield. Surface of dorsal shield bearing numerous strongly sclerotized structures. Numerous short, strongly sclerotized grooves situated close to margins of dorsal shield. One pair of large L-shaped grooves in anterior area of dorsal shield, one pair of C-shaped grooves located near end of L-shaped structures. A deep transversal furrow situated in central area of dorsal shield, anterior to furrow with one pair of long strongly sclerotized grooves and a V-shaped strongly sclerotized structure. Four longitudinal grooves anteriorly connected by a strongly sclerotized transversal crossbar situated posterior to transversal furrow. Surface of dorsal shield with some oval pits. Marginal shield without sculptural pattern; with spiniform setae (about 24-31 in length).

Ventral idiosoma ( Fig. 4 ): Tritosternum with narrow and oval basis; laciniae with two smooth inner and two apically pilose outer branches ( Fig. 6 ). Sternal shield without sculptural pattern and bearing smooth, short (about 16-20 in length) and needle-like setae. Numerous setae visible close to coxae IV. One pair of lyriform fissures situated close to anterior margin of sternal shield. Genital shield scutiform (about 235 long and about 145 wide) its surface smooth ( Fig. 5 ). Ventral shield with oval pits, bearing smooth and needle like seta (about 24-28 long). Numerous setae situated in a horizontal row posterior to coxae IV, some setae placed on three strongly sclerotized humps close to caudal margin. Setae around anal opening similar in shape and length to other ventral setae. Stigmata situated between coxae II and III. Prestigmatic part of peritremes long and hook-shaped, poststigmatic part short ( Fig. 4 ). Pedofossae deep, their surface smooth, only some denticles visible on posterior margins of pedofossae IV.

Gnathosoma ( Fig. 7 ): Corniculi horn-like, internal malae longer than corniculi and divided into four fringed branches. Hypostomal setae h1 short (about 28-30 in length) and smooth, h2-h4 marginally serrate, h2 and h4 short (about 50-55 in length), h3 long (about 93-95 in length), h3 situated close to h2. Deutosternal region smooth. Palpal trochanter with one short and smooth, and one long and marginally serrate seta. Other setae on palp smooth and needle-like, except for one pilose seta on dorsal side of femur; palpal claw bifurcate. Epistome subtriangular and deeply serrate on anterior margin ( Fig. 8 ). Chelicerae with one tooth on movable and fixed digit, fixed digit longer than movable digit, pilus dentilis absent, internal sclerotized node present, one dorsal seta present ( Fig. 9 ).

Legs ( Figs 11-14 ): Leg I 400-410 long, leg II 345-350, leg III 365-375, leg IV 420-430. Legs I-IV each with a pair of claws at tip of ambulacral prolongation; claws of legs I smallest. Most setae on legs needle-like, several robust and serrate setae situated on all legs. Flap-like processes present on femora II-IV and coxa I.

Description of male: Length of idiosoma 960-1000, width 660-700 (n=3). 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. 10 ). Positions of sternal setae as in Fig. 10 . Sternal setae smooth and needle-like (about 15-20 long), one pair of lyriform fissures situated close to first sternal setae. Genital shield rounded (about 53-55 × 62-65 in dimension) and placed between coxae III. Other characters same as in female.

Nymph and larva unknown.

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

Figures

Figs 1 - 4. Bostocktrachys surinensis sp. nov., female holotype. (1) Dorsal idiosoma. (2) Setae on caudal margin and caudal part of dorsal shield. (3) Area posterior and anterior to transversal dorsal furrow. (4) Ventral idiosoma.

Figs 5 - 10. Bostocktrachys surinensis sp. nov., female holotype (5 - 9) and male paratype (10). (5, 10) Intercoxal area. (6) Tritosternum. (7) Ventral view of gnathosoma and palp. (8) Epistome. (9) Lateral view of chelicera.

Figs 11 - 14. Bostocktrachys surinensis sp. nov., female holotype. (11) Ventral view of leg I. (12) Ventral view of leg II. (13) Ventral view of leg III. (14) Ventral view of leg IV.