Atropacarus (Hoplophorella) onkos, Niedbała, 2017

Niedbała, Wojciech, 2017, Ptyctimous mites (Acari, Oribatida) of Tanzania, Acarologia 57 (4), pp. 957-1072 : 1053

Atropacarus (Hoplophorella) onkos n. sp.

( Fig. 66 A-H)

Zoobank: DBDE4696-8C65-4999-8B3D-A6D3CF158F4D

Description — Measurements of holotype: prodorsum: length 303, width 202, height 156, setae: ss 76, in 45, le 35, ro 23; notogaster: length 636, width 429, height 384, setae: c 1 and ps 1 40, h 1 45; genitoaggenital plate 172×131, anoadanal plate 217×152. Species of medium size; colour dark brown. Body covered with strong cerotegument. Surface of prodorsum and ventral plates covered with concavities or small reticulation, surface of notogaster covered with small protuberances. Prodorsum with powerful median crista. Lateral carinae absent. Sigillar fields invisible. Posterior furrows well developed. Sensilli fairly long, with narrowly fusiform head finely barbed. Other setae (except vestigial exobothridial) spiniform, fine, smooth, similar to notogastral setae; ss> in> le> ro. Notogaster with developed anterior collar. Setae spiniform, fine, smooth, very short (c 1 /c 1 -d 1 =0.2); setae c 1 situated at collar, setae c 3 near collar, setae c 2 far away from collar. Vestigial setae and lyrifissures invisible. Ventral region. Setae h of subcapitular mentum are shorter than distance between them. Formula of genital setae: 4: 5. Anoadanal plates with 5 pairs of very short spiniform setae, setae ad 2 situated at the level between anal setae, both setae ad 2 and ad 3 positioned rather near paraxial border of plate. Chaetome of legs complete. Setae d on femora I slightly remote from distal end of article, setae l” minuscule.

Holotype TAN-003 (deposited in Department of Animal Taxonomy and Ecology, Pozna ´n).

Etymology — The name onkos is Latinised Greek for „a protuberance, tubercle“ and refers to the covering of surface of notogaster.

Comparison — The new species is similar to A. (H.) subitus (Niedbała, 1983) from Kenya in the shape of setae and sensilli but is distinguishable especially by the presence of protuberances on surface of notogaster and anterior collar of notogaster, and furthermore setae h of subcapitular mentum are shorter than distance between them (versus slightly longer), arrangement of genital setae is 4: 5 (versus (4+2): 3, setae ad 3 on anoadanal plates are located rather near paraxial border (versus remote from border). Legs, minute setae l” of femora I.

Locality in Tanzania: The Uluguru Mts.

Distribution — Afrotropical species known only from Tanzania, probably endemic.

Figures

FIGURE 66: Atropacarus (Hoplophorella) onkos n. sp. (holotype): A – prodorsum, dorsal view; B – prodorsum, lateral view; C – opisthosoma, lateral view; D – opisthosoma, dorsal of anterior part of notogaster; E – mentum of subcapitulum; F, left genitoaggenital plate; G – right anoadanal plate; H – trochanter and femur of leg I.