Sumatrotritia inusitata Mahunka, 1989

Niedbała, Wojciech & Ermilov, Sergey G., 2013, New and little known ptyctimous mites (Acari, Oribatida) from India, Zootaxa 3731 (4), pp. 577-588 : 583

Sumatrotritia inusitata Mahunka, 1989

( Fig. 4 A–E )

All characters almost as in description of holotype ( Mahunka 1989). Below we have listed a few additional characters and verified the description given by Mahunka (1989).

Measurements of specimen from India (Locality: In-3). Prodorsum: length 273, height 91. Prodorsal setae: sensillum 88, interlamellar 131, lamellar 154, rostral 126. Notogaster : length 505, height 409.

The specimen measured is smaller than that described by Mahunka (differences in the size of individuals occur in many species of ptyctimous mites).

Diagnosis. Prodorsum with two pairs of vestigial exobothridial setae. Genitoaggenital region with seven pairs of setae, three pairs of long setae in the antero-median part of plate and four pairs of minute setae, one in anteroparaxial position, anteriorly of suture kag and three pairs in antiaxial position, one anteriorly of suture kag ( Mahunka (1989) shows the setae in the Figure 8, but does not mention their presence in the description). The minute setae (three pairs?) depicted by Mahunka are inaccurately presented. The three pairs of long setae in Fig. 8 of Mahunka are located along paraxial border of plate but in our specimens they are slightly skewed from paraxial border.

Setae h of mentum very long, considerably longer than distance between them. Femora I with four setae.

Diagnostic characters of genus Sumatrotritia . Bothridial scale situated dorso-posteriorly of bothridia. Two pairs of exobothridial setae. Interlamellar setae displaced towards antiaxial side of prodorsum. Two interlocking triangles present. Seven pairs of genital setae present, three of them very long, situated medially and obliquely in anterior part of plate, four others minute, situated on or near progenital plate. Each trochanter of legs with one seta.

This genus takes an intermediate place in the Euphthiracaroidea classification, between Euphthiracarus , Pocsia and Acrotritia . In the genera Euphthiracarus and Pocsia two interlocking triangles of ventral area are present, while in Acrotritia one triangle. In the genus Euphthiracarus bothridial scale of prodorsum is positioned below bothridium, while in the genera Pocsia and Acrotritia it is above bothridium.

Figures

FIGURE 4A–E. Sumatrotritia inusitata Mahunka, 1989. A, prodorsum, lateral view; B, left side of genitoaggenital plate, C, mentum of infracapitulum, D, coxae and trochanters of legs III and IV; E, trochanter and femur I.