Arhodeoporus Newell, 1947

Bartsch, Ilse, 2015, The genital area of Halacaridae (Acari), life stages and development of morphological characters and implication on the classification, Zootaxa 3919 (2), pp. 201-259 : 210-212

Arhodeoporus Newell, 1947

( Figs 16 –22)

Type species. Copidognathus (Arhodeoporus) arenarius Newell, 1947 .

Adults (differing characters of species of the A. bonairensis and A. bucculentus groups are in square brackets). In female and male GP and AP fused. Female GA with three pairs of pgs; genital sclerites with (zero to) one to two (to three) pairs of sgs. GO with two pairs [a single pair] of small, tube-like gac ( Figs 16 , 19, 21; Bartsch 2003d: fig. 5E; Newell 1971: fig. 59). If two pairs present, these situated immediately adjacent, either anterior to and somewhat posterior to middle of GO. Ovipositor at rest extending anteriad from slightly to far beyond GO. On everted ovipositor one or two pairs of anterior and seven posterior genital spines visible ( Fig.17 ; Bartsch 1977a: figs 5, 14, 1991b: fig. 4). Genital spines short, weakly sclerotized, flattened or rather long and slender. GO in male almost as long as in female but distance to anal cone longer than that in female. GA with [one to] two pairs of internal acetabula ( Figs 18 , 20; Bartsch 1997b: fig. 37, 2003d: fig. 5C), 7–20 pairs of smooth and slender pgs and four to five (rarely three or six) pairs of sgs, most of setae filiform though one to three may be spur-like. Adults with pair of epimeral pores.

Juveniles. One larval and two (?) nymphal stages known. Deuto- and protonymphal GP separated from AP. Deutonymphal GP with two pairs of pgs, zero to one pair of sgs and two pairs [single pair] of small internal gac (Fig. 22; Bartsch 1977a: fig. 9, 1977b: fig. 239, 1991c: fig. 4K); in small-sized A. nanus Bartsch, 2009 gac vestigial ( Bartsch 2009c). Protonymph with single pair of gac near posterior margin of GP; pgs and sgs lacking. Larva with epimeral pores.

Remarks. The genus Arhodeoporus is spread world-wide and more than 30 species are described. On the basis of external characters, several distinctly separate species groups have been characterized ( Bartsch 1983b, 1997b). The genus is in need of revision.

Adults of A. bonairensis ( Viets, 1936) and A. wadjemupis Bartsch 1997 have a single pair of genital acetabula. The two species belong to the A. bonairensis and A. bucculentus groups, respectively. No protonymphs have been recorded of species of these groups. The genus Plegadognathus Morselli, 1981 may have to be re-established to include the species of these two groups.

Figures

FIGURES 16 – 18. Arhodeoporus gracilipes (Trouessart, 1889), 16. genital region, female; 17. everted ovipositor, ventrolateral aspect; 18. genital opening, male. FIGURES 19 – 20. Arhodeoporus corallinus Otto, 2000, 19. genital region, female; 20. genital opening, male. FIGURES 21 – 22. Arhodeoporus bonairensis (Viets, 1936), 21. genital opening, female; 22. genital plate, deutonymph. FIGURES 23 – 24. Atelopsalis pacifica Bartsch, 1985, 23. posterior part of genitoanal plate, female, ventrolateral aspect (genital acetabula of the other side not illustrated); 24. genital plate, protonymph. FIGURES 25 – 26. Australacarus pustulatus Bartsch, 1993, 25. genitoanal plate, female; 26. genitoanal plate, male. FIGURE 27. Bathyhalacarus acutus Bartsch, 1982, genital opening, female. (fo, foveate surface structure; gac, genital acetabula; ov, ovipositor; pa, porose surface structure) Scale = 50 µm.