Retrozetes

Colloff, Matthew J., 2012, New eremaeozetid mites (Acari: Oribatida: Eremaeozetoidea) from the south-western Pacific region and the taxonomic status of the Eremaeozetidae and Idiozetidae, Zootaxa 3435, pp. 1-39 : 32

Key to species of Retrozetes

1. Apices of lamellae S-shaped: curved posteriorly, then recurved anteriorly; median sclerotised bands of lamellar cuticle forming Y-shaped structure dorsally ( Fig. 15 )................................................ R. novaecaledoniae sp. nov.

- Apices of lamellae not S-shaped: only curved posteriorly, not recurved anteriorly; median sclerotised bands of lamellar cuticle sub-parallel or forming V-shaped structure dorsally........................................................... 2

2. Apex of rostrum visible in dorsal orientation, with acute projection; stalk of bothridial seta recurved; apices of lamellae separated by drop-shaped fissure ( Fig. 17 )................................................. R. fernandezi sp. nov.

- Apex of rostrum covered by lamellae in dorsal orientation, without acute projection; stalk of bothridial seta not recurved; apices of lamellae separated narrow slit or broad U-shaped or rectangular fissure................................... 3

3. Lamellar cuspides divided by broad rectangular or circular fissure; cerotegument thick, reticulate; lenticulus broader than long; notogastral margin scalloped in region of setae of h series; genital and anal plates separated by distance of half length of genital plate................................................................................................ 4

- Lamellar cuspides divided by narrow slit; cerotegument light, reticulate or amorphous; lenticulus longer than broad; notogastral margin smooth; genital and anal plates almost abutting ( Fig. 14 )....................... R. mirabilis sp. nov.

4. Small species (≤155 μm long), rostral seta long, thick, curved, blunt apically covered in cerotegument; head of bothridial seta broad, club-shaped; setae of ad series spaced equidistantly............................ R. hanswursti ( Mahunka, 1999)

- Larger species (≥350 μm long), rostral setae short, thin, straight, without thick cerotegument; head of bothridial seta narrow, elongate, expanding apically; setae ad 2-3 positioned close together lateral of anal plates ( Fig. 11 )..... R. koghisensis sp. nov.

Figures

FIGURE 11. Retrozetes koghisensis sp. nov., holotype female, cerotegument removed; a) dorsal; b) ventral; c) lateral aspect.

FIGURE 14. Retrozetes mirabilis sp. nov., holotype female, cerotegument removed; a) dorsal b) ventral; c) lateral aspect.

FIGURE 15. Retrozetes novaecaledoniae sp. nov., holotype female; a) dorsal, with cerotegument; b) dorsal, with cerotegument removed.

FIGURE 17. Retrozetes fernandezi sp. nov., holotype female, cerotegument removed; a) dorsal; b) ventral; c) lateral aspect.