Acanthohalacarus Bartsch, 2001

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 : 206

Acanthohalacarus Bartsch, 2001

( Figs 1 and 2 )

Type species. Acanthohalacarus reticulatus Bartsch, 2001 .

Adults. Genital and anal plates fused. Female GA with five (rarely four or six) pairs of slender pgs, genital sclerites with two pairs of short sgs. Genital acetabula internal; posterior-most pair of acetabula larger and removed from two anterior pairs ( Fig. 1 ). Ovipositor at rest extending beyond anterior margin of GO. With short basal pair and slender, spiniform apical pairs of genital spines; number of spines not known. Male GO in ventral position, smaller than that of female ( Bartsch 2001a: fig. 1D), in single species known surrounded by 45–57 slender and smooth pgs; several of pgs outlying. Genital sclerites with five pairs of short sgs, two anterior pairs setiform, three posterior ones short, spiniform. Acetabula adjacent in posterior half of GO, the three pairs short, equal-sized, cupuliform ( Fig. 2 ). Anterior epimeral plate without epimeral pores.

Juveniles. One larval and two nymphal stages known. Nymphs with genital plate separated from anal plate. Deutonymphal GP with two pairs of pgs, at least one pair of minute sgs and two pairs of internal gac ( Bartsch 2001a: fig. 3B). Protonymphal GP with single pair of gac; pgs and sgs lacking. Nymphs without but larva with pair of epimeral pores ( Bartsch 2001a: fig. 3F).

Remarks. At present a single species is known, collected on a seamount in the northeastern Atlantic Ocean ( Bartsch 2001a).

Figures

FIGURES 1 – 2. Acanthohalacarus reticulatus Bartsch, 2001, 1. genital opening, female; 2. genital opening, male. FIGURES 3 – 4. Acarochelopodia biunguis Bartsch, 1988, 3. genitoanal plate, male; 4. genital plate, deutonymph. FIGURES 5 – 6. Acaromantis armatus Bartsch, 1977, 5. genital opening, female; 6. genital plate, protonymph. FIGURE 7. Actacarus spinosus Otto, 2000, posterior part of genitoanal plate, female. FIGURE 8. Agaue galatea Otto, 1999, genital plate, deutonymph. FIGURES 9 – 10. Agauopsis arborea Bartsch, 2003, 9. genital opening, female; 10. genital opening, male. FIGURE 11. Agauopsis arabia Bartsch & Chatterjee, 2001, everted ovipositor and two genital spines (enlarged), ventral aspect, female. FIGURE 12. Agauopsis mokari Otto, 1994, genital opening, male. FIGURE 13. Agauopsis sp. (A. furcata group), genital opening, female. FIGURES 14 – 15. Agauopsis moorea Bartsch, 1992, 14. genital opening, female; 15. genital opening, male. (agsp, apical genital spine; bgsp, basal genital spine; gac, genital acetabula; GF, genital foramen; gsc, genital sclerite; gsp, genital spines; pgs, perigenital setae; sgs, subgenital seta) Scale = 50 µm