Protoribates hirokous Nakamura & Fukumori & Fujikawa 2010, sp. nov.
Creators: name: Nakamura, Y. - N.
name: Fukumori, S.
name: Fujikawa, T.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Protoribatidae
Protoribates
Protoribates hirokous

description: Protoribates hirokous sp. nov.   
[Japanese name: Hiroko-kosodedani] (Figs. 21 and 22)  
 Diagnosis — Body length 429 (468) 507 µm; width 279 (300) 321 µm.Thin lamellar ridges situated marginally. Pteromorphae movable. Ten pairs of notogastral setae. Genito-anal setal formula: 5- 1-2-3. Setae ad 1 and ad 2 longer than ad 3. A short Trägårdh’s organ terminating in a fine apex. Monodactyl.   
Material examined — Holotype (Female) (NSMT-Ac 13598) from point D; 2 paratypes (Female and male) (NSMT-Ac 13599 and 13600): same data as holotype.  
Etymology — The new species is dedicated to Miss Hiroko Fukumori who gave the authors helpful suggestions for sampling.  
Measurements and body appearance — Body length 429 (468) 507 µm; width 279 (300) 321 µm. Body colour light brown. Whole integument smooth. Muscle sigillae seen as a number of light spots arranged on epimeres and peripherally on notogaster.  
 Prodorsum — Prodorsum triangular (Fig. 21A). Rostral tip round bearing setae ro laterally. Setae ro (75 µm) long setiform, extending for two-third length of seta beyond rostral margin. Thin lamellar ridges situated at marginal position of prodorsum, extending forwards from bothridia to almost middistance along prodorsum setae le arising at base of short extension, without cuspis or translamellar; le short (35 µm) setiform, reaching insertions of setae ro. Setae in long (75 µm) spiniform, extending for short distance anteterior of insertions of setae le. Setae ro, le and in ciliate throughout length. Bothridia opened anterolaterally. Sensilli (ss) (75 µm) pectinate unilaterally, consisting of fusiform head and long stem, strongly elbowed near base (Fig. 21D). Setae ex (5 µm) short, smooth setiform. Relative lengths and distances of prodorsal setae: ro ≈ in ≈ ss ≈ 2x le > ex; (in – in) (123 µm)> (le – le) (83 µm)> (le – in) (63 µm)> (ro – ro) (56 µm)> (ro - le) (35 µm).   
 Notogaster — Pteromorphae movable, without acute angle, not extending anteriorly beyond level of arched dorsosejugal suture. Ten pairs of notogastral setae short smooth setiform. Four pairs of porose areas present: Aa largest, roughly triangle (Fig. 21C) situated anterior to mid-distance between la and lm; A1, A2 elliptical; A1 immediately anterior to lp; A2 between h 2 and h 3; A3 oval, lateral to p 1. Opening gla situated lateral to lp. Lyrifissures ia aligned obliquely at the level of Aa on the pteromorphae; im transversely antero-laterally to gla; ip obliquely between p 1 and p 2. Relative distances central notogastral setae: (lp – h 1) (110 µm)> (lm – lm) (104 µm) ≈ (lm – lp)> (lp – lp) (87 µm)> (h 1 – h 1) (54 µm)> (p 1 – p 1) (48 µm).   
 Ventral region — Genital (48 µm) and anal (106 µm) apertures roughly circle in form; length of anal aperture about 2x as long as that of genital aperture; distance (123 µm) between them appreciably 2.5x as long as length of genital aperture (Fig. 21B). Genito-anal setal formula: 5-1-2-3; setae g, ag, an smooth setiform. Setae g 1 (11 µm) remote from anterior margin of the plate. Setae ag (11 µm) inserted latero-posteriorly to genital aperture. Setae an 1 and an 2 (33 µm) remote from each other and margins of plates. Adanal setae variable in form and length: ad 1 and ad 2 (45 µm) spiniform, barbed unilaterally, longer than ad 3 (21 µm); ad 3 short, smooth setiform. Setae ad 1 aligned in postanal position; ad 2 in adanal; ad 3 in preanal. Lyrifissures iad located at level of insertions of setae an 2. Sternal ridge distinct at bo 2. Epimeral borders bo. 1-3, sj distinct. Epimeral setal formula: 3-1-3-3; 1 b, 3 b, 3 c barbed throughout length, longer (33 µm) than others; others simple. Diarthric subcapitulum bearing 3 pairs of setae; a (30 µm) smooth spiniform; m (11 µm) short setiform, sparsely, minutely barbed; h (38 µm) closely barbed throughout length (Fig. 22A). Pedipalpal setal formula 0-2-1-3-9[1]; solenidion thick, strongly elbowed, originating from apophysis, coupled with acm. Chelicera bearing a short Trägårdh’s organ terminating in a fine apex; cha unilaterally ciliate and chb smooth; cha longer than chb (Fig. 22D).   
 Legs — Monodactyl; claws without dens. Setal formula: I (1-5-3-4-22), II (1-5-3-4-15), III (2-3-1- 3-15), IV (1-2-2-3-12). Tibiae II bearing small spur at proximal portion (Fig. 22C). On tarsus I, famulus ε bacilliform situated between solenidion ω 2 and fastigial seta ft ’ (Fig. 22B). Solenidion ω 1 bacilliform; ω 2 setiform, inserted behind ω 1; ω 1 shorter than ω 2; seta ft ’ as long as, ω 1. Solenidion ’ 1 originating from apophysis; ’ 2 contigueus to ’ 1.   
 Remarks — The new species has short lamellar setae such as in Protoribates paracapucinus (Mahunka, 1988) and P. brevisetosus (Fujita, 1989). However, it differs from them in distances among central notogastral setae, lm, lp and h 1, and notogastral setae h 2 inserted remote from porose areas A2. The prodorsl triangular form and arched dorsosejugal scissure extending beyond pteromorphae of the new species is very similar in appearance to those of P. dentatus (Berlese, 1883). However the new species has short lamellar, interlamellar and notogastral setae, and monodactyl, while P. dentatus has long prodorsal and notogastral setae, and tridactylous (Berlese, 1916 [1917]; PØrez-Iaeigo, 1992).
description: Published as part of Nakamura, Y. - N., Fukumori, S. & Fujikawa, T., 2010, Oribatid Fauna (Acari, Oribatida) From The Kumaya Cave Of Iheya Village In Central Ryukyu Arc, South Japan, With A Description Of Several New Species, pp. 439-477 in Acarologia 50 (4) on pages 469-472, DOI: 10.1051/acarologia/20101988, http://zenodo.org/record/5393450