Hexaxonopsis (Hexaxonopsis) rectimarginata, Smit, Harry, 2016

Smit, Harry, 2016, The water mite family Aturidae Thor (Acari: Hydrachnidia) from Ghana, with the description of twelve new species, Zootaxa 4158 (4), pp. 523-543 : 534-535

Hexaxonopsis (Hexaxonopsis) rectimarginata n. sp.

( Figs. 8A–C )

Material examined. Holotype male, Afiaso stream, Kakum NP, Ghana, 5 30.087 N 1 26.373 W, alt. 114 m a.s.l., 12-ii-2013.

Diagnosis. Posterior idiosoma margin near-straight, genital field with four pairs of acetabula. Description. Male: Idiosoma oval, yellowish, dorsally 409 long and 373 wide, ventrally 400 long, posterolaterally with a small, pointed, posteriorly-directed extension. Dorsal shield 348 wide, anteriorly fused with ventral shield, anteriorly and posteriorly with a bluish patch, with five pairs of glandularia, central and posterior pairs close to each other; excretory pore fused with dorsal shield. Anterior coxae not extending to frontal margin, Cx-I and Cx-II with a hook-like lateral extension. Between fourth leg sockets and genital field two pairs of glandularia, one pair halfway and one pair close to genital field. Genital field with four pairs of acetabula, one pair distinctly smaller than other three pairs; gonopore 28 long. Length of P1–5: 31, 50, 29, 70, 28. P2 slender, P4 ventrally slightly bulging. Length of I-leg-4–6: 56, 76, 74. Length of IV-leg-4–6: 86, 104, 88. Numbers of swimming setae: III-leg4 and IV-leg-4 two, III-leg-5 four, IV-leg-5 three.

Female: Unknown.

Etymology. Named for the near-straight posterior idiosoma margin.

Remarks. The combination of a near-straight posterior margin and four pairs of acetabula is not found in other Hexaxonopsis species.

Figures

FIGURE 8 A – C. Hexaxonopsis rectimarginata n. sp., holotype male. A = dorsum; B = venter; C = palp. Scale bars = 50 µm.