Hexaxonopsis (Hexaxonopsis) angkoriensis, Pešic & Smit, 2016

Pešic, V. & Smit, H., 2016, New records of water mites from Southeast Asia (Acari: Hydrachnidia) with the description of two new genera and 12 new species, Acarologia 56 (3), pp. 393-433 : 420-422

publication ID

https://doi.org/ 10.1051/acarologia/20162251

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scientific name

Hexaxonopsis (Hexaxonopsis) angkoriensis

n. sp.

Hexaxonopsis (Hexaxonopsis) angkoriensis n. sp.

( Figures 15E View FIGURE , 18 View FIGURE )

Type material — Holotype female, dissected and slide mounted, Cambodia, 15-35-1 Angkor , moat around the main Angkor temple, 13°24’54.0"N, 103°51’34.8"E, alt. 26 m a.s.l., depth 0.4- 0.2 m, substrate: red sand covered by detritus. GoogleMaps

Diagnosis — (Male unknown). Dorsal shield colour indistinct; lateral margins posterior to IV-L insertions with developed triangular projection on each side of ventral shield.

Description — Female: Dorsal and ventral shields lightly fused anteriorly; dorsal shield with six pairs of small glandularia (the sixth pair inconspicuous, flanking the excretory pore); postocularia well distanced from anterior margin; excretory pore projecting, located at the posterior end of dorsal shield ( Figure 18A View FIGURE ); dorsal shield colour indistinct ( Figure 18E View FIGURE ); eye pigment well developed. Ventral shield oval, slightly truncate at anterior end, lateral margins with well developed triangular projection on each side ( Figure 18B View FIGURE ) posterior to IV-L insertions. Lateral margins of Cx-I/II with several, blunt and posteriorly-directed projections; two pairs of glandularia (posterior one visible as a pair of distinct pores and could be interpreted as the remnants of a second pair of glandularia) located between insertions of the IV-L and genital field. Genital field with three pairs of Ac, arranged in an arc. Palp: ventral margin of P-2 convex, distal margin of P- 3 with well developed hyaline extensions, middle of ventral side of P-4 expanded, bearing relatively long and heavy seta ( Figure 18 View FIGURE C-D). Legs: numbers of swimming setae: II-L-5, 2; III-L-4, 2; III-L-5, 3; IV- L-4, 2; IV-L-5, 3.

Measurements — Dorsal shield L/W 440/320, ratio 1.38; ventral shield L/W 434/378; gnathosomal bay L 110; distance between most lateral pair of Ac 174, gonopore W 77. Palp: total L 214, dL/H, dL/H ratio: P-1, 35/15, 2.3; P-2, 49/39, 1.26; P-3, 26/25, 1.03; P-4, 73/25, 2.9; P-5, 31/10, 3.1; dL ratio P-2/P-4, 0.67; gnathosoma vL 56, with apodemes 91. Legs: dL of I-L: 35, 39, 34, 51, 72, 70; dL of IV-L: 45, 70, 59, 74, 82, 84.

Male: Unknown.

Etymology — Named after the country where the new species was collected.

Remarks — The new species resembles Hexaxonopsis bharatensis Cook, 1967 from India, due to the absence of a longitudinal ridge posterior to IV-L insertions, the lack of posteriorly-directed denticles on the dorsal shield and the similar morphology of palp. The latter species can be distinguished from A. angkoriensis n. sp. by the lacking projections on the lateral margin of the ventral shield, the sharppointed hook-like extensions of the coxae and the characteristic colour pattern of the dorsum consisting of a central elongated blue patch ( Cook 1967).

Distribution — Laos; known only from the locus typicus ( Figure 25D View FIGURE ).