Eupelops sp.

Nakamura, K., Nakamura, Y. - N. & Fujikawa, T., 2013, Oribatid Mites (Acari, Oribatida) From Tohoku (Northeast Japan), Collected After A Tidal Wave In 2011, Acarologia 53 (1), pp. 41-76 : 64-68

Eupelops sp.

( Figures 17 – 19 )

Diagnosis — Prodorsal surface granulate; notogastral integument bearing irregular broken angular insular lumps; other body surface punctulate. Tutorium with sharply pointed apex, without dens. Anterior notogastral tectum broadly concave. Notogastral setae spinose bacilliform. Genito-anal setal formula: 6-1-2-2. Epimeral setal formula: 3-1-3- 3. Pedipalpal setal formula: 2-1-3-9[1]. Chelicerae bearing two Trägårdh’s organs. Heterotridactylous.

Material examined — Female (NSMT-Ac 13610) from point A. The present specimen was the other half of only two specimens collected from the point A. Some conspicuous features were remarkable to be justified as a new species, however, the specimen is described only as Eupelops sp. in the present work, because of being rather damaged by preparing for study (body broken)..

Measurements and body appearance — Body colour dark reddish-brown. Prodorsal surface granulate; granules dark, large, closely. Notogastral integument including pteromorphae covered with ornament of irregular broken angular insular lumps. Other surface, namely, lamellae, cuspidis, genitalanal plates, subcapitulum, ventral plate and legs punctulate.

Prodorsum — Setae ro (63 µm) ciliate ensiform with narrow basal portion, inserting on lateral rostral margins at base of free tip of tutorium, extending for short distance anterior of rostral margin. Tutorium with sharply pointed apex, without dens ( Fig. 17C ). Tips of lamellar cuspis terminating in a sharp point, anteroventrally arising lamellar setae ( Fig. 17A ). Setae le (41 µm), thick setiform with sparsely, unilaterally barbed distal portion, reaching anterior margin of rostrum. Setae in (157 µm) narrow phylliform, sparsely spiculate throughout length on dorsal side, smooth on ventral side ( Fig. 17F ). Bothridia opening dorsally. Sensilli (ss) (72 µm) rod-like without narrow apex, spiculate distally, smooth basally ( Fig. 17D ). Setae ex (3 µm) minute, smooth spiniform.

Notogaster — Anterior notogastral tectum broadly concave, projecting further anteriorly than anterior margin of movable pteromorphs, covering basal part of prodorsum ( Fig. 17B ). Notogastral setae bacilliform, spinose throughout their length, smooth basely, variable in length; the shortest c (29 – 30 µm) ( Fig. 17E ).

Ventral region — Genital (64 µm) and anal apertures (62 µm) roughly pentagonal in shape; distance (70 µm) slightly longer than length of each aperture ( Fig. 18A ). Genito-anal setal formula: 6-1-2- 2; all setae short, smooth setiform. Setae g 1, g 2 (9 µm) inserting at the anterior margins of plates. Setae ag (11 µm) inserted latero-posteriorly to genital aperture, near one tenth-distance between genital and anal apertures. Setae an 1 (7 µm) and an 2 (9 µm) inserting near posterior inner and anterior outer margin of plates, respectively. Setae ad 1 (8 µm) aligned in postanal position; ad 2 (6 µm) lateroposteriorly; ad 3 absent. Lyrifissures iad located along outline of aperture, posterior to the level of setae an 2. Epimeral setal formula: 3-1-3-3; setae (9- 19 µm) short, smooth setiform; 3 c the longest ( Fig. 18C ). Pedipalpal setal formula: 0-2-1-3-9[1]. Subcapitulum suctorial, subcapitular setae 3 pairs, a (24 µm), m (11 µm), and h (14 µm); all setae smooth, spiniform, terminating a fine tip ( Fig. 18B ). Chelicerae bearing two Trägårdh’s organs (69 µm) ( Fig. 18D ). Setae cha (17 µm) thin setiform; chb (4 µm) smooth cone-like.

Legs — Heterotridactylous; claws (51 µm) dentate dorsally ( Fig. 19A ) Setal formula: I (1-5-3-4-20), II lost, III (2-3-1-3-14), IV (1-2-2-4-12).Measurements (µm) of right segments: I (51-116-44-55-66), II lost, III (54-73-25-59-62), IV (56-71-43-86-71). Genu I, femur IV and trochantera III-IV bearing protrusion ( Figs. 19 E-G). Solenidiotaxy; I (1-2-2), II lost, III (1- 1-0), IV (0-0-0), solenidion absent on tibiae IV. On tarsus I, famulus ε (15 µm) spiniform, contiguous to ω 1 situated anteriorly between solenidia ω 1 and ω 2; ω 1 (23 µm) bacilliform; ω 2 (45 µm) setiform; seta ft ’ (3 µm) minute setiform inserting posteriorly, contiguous to ω 2 ( Fig. 19B ). On tibia I solenidion ’ 2 (33 µm) situated laterally to ’ 1 (broken) at the tip ( Fig. 19D ). Supracoxal setae recognizable ( Fig. 19C ).

Remarks — The present specimen has rod-like sensilli and concave anterior tectum of the notogaster such as found in Eupelops kumayaensis Nakamura et al., 2010 , and shape of ornament on notogastral integument such as found in E. kumaensis Fujikawa, 2009 . However, this specimen is different from congeners in (1) shape of rostral, lamellar and chelicerae setae, (2) shape of tip of tutorium, (3) length of notogastral setae and Trägårdh’s organs, (4) number of adanal setae, and (5) situation, length and shape of famulus and solenidia of legs.

Figures

FIGURE 17: Eupelops sp. (NSMT-Ac 13610): A – Right pteromorphal region; B – Anterior notogastral tectum; C – Right rostral region; D – Right bothridial region; E – Notogastral seta c; F – Interlamellar seta.

FIGURE 18: Eupelops sp. (NSMT-Ac 13610): A – Right genital-anal region; B – Anterior region of subcapitulum; C – Right discidium region; D – Chelicera.

FIGURE 19: Eupelops sp. (NSMT-Ac 13610): A – Tip of right tarsus I; B – Solenidial region on left tarsus I; C – Suprocoxal setal region; D – Solenidial region on right tibia I; E – Right genu I; F – Right trochanter III; G – Left trochanter IV.