Ptyctimous mites (Acari, Oribatida) of Tanzania Author Niedbała, Wojciech text Acarologia 2017 2017-11-14 57 4 957 1072 http://dx.doi.org/10.24349/acarologia/20174217 journal article 10.24349/acarologia/20174217 2107-7207 5402635 21351710-FE9E-4E20-A29D-C480D3BA56FD 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.