Arcozetes rotundatus, Mahunka, 2006

Mahunka, S., 2006, Oribatid Mites (Acari: Oribatida) From Venezuela, Ii. New Or Rare Species From Montane Forests, Acta Zoologica Academiae Scientiarum Hungaricae 52 (3), pp. 271-286 : 279-280

Arcozetes rotundatus sp. n.

( Figs 15–18, 22–24)

Diagnosis: Rostrum tubuliform, like a snout of a pig. Lamellae narrow, with sharply pointed apex and large teeth. Tutorium widened distally with 2–3 teeth on a distal cusp. Sensillus elongate, roundish ( Fig. 19). Notogaster very large, pteromorphae also large rounded laterally. Four pairs of porose areae and ten pairs of notogastral setae distinct. Infracapitulum large, galumnoid type. Anogenital setal formula: 5–1–2–2.

Material examined: Holotype: Venezuela, Parque Nacional Henri Pittier, seasonal rain forest: 20 April, 2005 – in and around a forest stream litter and soil. Leg. CS. CSUZDI & D. MURÁNYI (B-36). Seven paratypes from the same sample; holotype (1703-HO-05) and 5 paratypes (1703-PO-05): HNHM, 2 paratypes: MHNG.

Measurements: Length of body: 240–255 µm, width of body: 182–194 µm.

Prodorsum ( Fig. 20): Rostral apex wide in dorsal view and tubuliform, like a snout of a pig in lateral view ( Fig. 16). Lamellae narrow, touching but not fused medially. Their apices long, sharply pointed. Both bearing a sharp tooth, and a deep hollow, where lamellar setae ( Fig. 17) insert. Rostral setae arising at apices of tutorium, these and lamellar and interlamellar setae very long. Bothridium with a very long interior apohysis ( Fig. 18), sensilli fusiform, without sharply pointed distal apex.

Notogaster: Very wide, dorsosejugal region convex (Fig, 15). Pteromorphae angular anteriorly (in dorsal view). Ten pairs of distinct notogastral setae present, one pair of them arising on the pteromorphae. Four pairs of small areae porosae present ( Fig. 22). They are much smaller, than those of A. bicuspidatus ( Fig. 21).

Lateral part of podosoma: Tutorium very large and long, its distal part dilated, with some teeth on the distal cusp ( Fig. 16). Some smaller teeth also visible on its lateral part. Pedotectum 1 large, convex, and smooth ( Fig. 24). Exobothridial setae long. Circumpedal carina wide, well discernible, custodium long.

Ventral parts ( Fig. 23): Infracapitulum large, anteriorly rounded, galumnatoid type. Lateral part of pedotectum 1 longitudinally striate. Discidium and custodium large. Epimeral region also of galumnatoid type. Apodemes short, epimeral setation: 1–1–2–2. Anogenital setal formula: 5–1–2–2. All setae well discernible, genital setae much longer than the anal and adanal ones.

Legs: All legs tridactylous.

Remarks: Heretofore only the type species of Arcozetes ( A. bicuspidatus

HAMMER, 1958) has been known. The new species is distinguishable from the type species by the form of the sensillus (sharply pointed distal end of the distal end in the type species) ( Fig. 19).

Etymology: Named after the form of the sensillus. dorsal view, 21 = porose area Aa. 22 = Arcozetes rotundatus sp. n., porose area Aa