Oribotritia perpusilla, Niedbała & Starý, 2016

Niedbała, W. & Starý, J., 2016, Six new species of ptyctimous mites (Acari: Oribatida) from Madagascar, Acarologia 56 (4), pp. 485-496 : 486

Oribotritia perpusilla n. sp.

( Figures 1 )

Description

Measurements of holotype — Prodorsum: length 255, width 150, height 94, setae: sensillus 101, interlamellar (in) 53, lamellar (le) 43, rostral (ro) 35; notogaster: length 429, width 152, height 247; notogastral setae: c 1 and h 1 38, ps 1 45; genital and aggenital plates 99 × 38, anal and adanal plates 233 × 25.

Medium-sized species; body colour pale yellow.

Prodorsum — with distinct, long and simple lateral carinae. Sensilli long, bent in proximal part, smooth. Other prodorsal setae short, interlamellar (in) and rostral (ro) setae erect, rough, lamellar setae (le) procumbent, smooth, exobothridial setae (ex) vestigial.

Notogaster — Notogastral setae short, c 1 / c 1 - d 1 =0.4, all notogastral setae strong, rough, except filiform setae c 3 and ps 3; setae c 1 and c 2 remote from anterior margin, setae c 3 near the margin.

Ventral region — Setae h of subcapitular mentum shorter than distance between them. Anogenital cleft trv long. Nine pairs of genital and two pairs of equal aggenital setae present, genital setae g 1-5 longer than setae g 6-9. Anal plate without setae and three pairs of adanal setae present. Distance between adanal setae ad 1 and ad 2 slightly longer than between ad 2 and ad 3. Lyrifissures iad situated laterally between adanal setae ad 2 and ad 3.

Legs — Chaetome of legs without tarsi: I: 1- 3-5(2)-5(1), II:1-4-3(1)-3(1), III: 3-2-3(1)-3(1), IV: 3-2- 2(1)-3(1); all tarsi heterotridactylous.

Material examined — Holotype is deposited at DATE from locus typicus: Madagascar, Ranomafana National Park, Vatoharanana, 3. X. 2012, evergreen rain forest, latitude 21°16’42.2" S, longitude 47°26’18.2" E, altitude about 1000 m, sifted forest leaf litter, Winkler apparatus extraction, leg. L. S. Rahanitriniaina.

Etymology — The name of the new species perpusillus is Latin for "very small" and alludes to the small size of body in comparison with congeners.

Comparison — The new species differs from its congeners by the small size, the long, simple lateral carinae of the prodorsum and long, bent sensilli, absence of anal setae and presence of three pairs of adanal setae.

Figures

FIGURE 1: Oribotritia perpusilla n. sp. (holotype): A – prodorsum, dorsal view; B – prodorsum, lateral view; C – opisthosoma, lateral view; D – mentum of subcapitulum; E – right side of ventral plates; F - trochanter and femur of leg I.