Haplozetes makii, Nakamura & Fukumori & Fujikawa, 2010

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, Acarologia 50 (4), pp. 439-477 : 472-474

Haplozetes makii sp. nov.

[Japanese name: Maki-koitadani] ( Figs. 23 and 24 )

Diagnosis — Body length 329 µm; width 193 µm. Four pairs of saccules. Pteromorphs movable. Ten pairs of notogastral setae. Sensilli consisting of capitate spiculate head and long, smooth, thin stem. Thin lamellar ridges converge. Diarthric subcapitulum. Genito-anal setae: 4-1-2-3; all setae smooth, thin setiform. Heterotridactylous.

Material examined — Holotype (Female) (NSMT-Ac 13601) from point D; 1 paratype (Female) (NSMT-Ac 13602): same data as holotype.

Etymology — The new species is dedicated to Miss Maki Fukumori for her continual encouragement.

Measurements and body appearance — Body length 329 µm; width 193 µm. Body colour light brown. Whole integument smooth. A number of light spots arranged peripherally on notogaster.

Prodorsum — Rostrum protruding with blunt tip, bearing setae ro at lateral sides ( Fig.23A ). Setae ro long (40 µm) setiform bearing long and short barbs, antiaxially and paraaxially, respectively, extending for two-third length of seta anterior of rostral margin. Thin lamellar ridges convergent, situated not submarginal, extending anterior from bothridia to short distance in front of mid-distance along the prodorsum, setae le arising at ends, without cusp or translamellar; le long (58 µm) setiform, extending for short distance beyond rostral tip. Setae le and in barbed throughout length. Setae in (58 µm) extending for short distance anterior of insertions of setae le. Bothridia opened anterolaterally. Sensilli (ss) (43 µm) consisting of capitate spiculate head and long, smooth, thin stem ( Fig. 23C ). Setae ex (7 µm) short, smooth spiniform. Relative distances of prodorsal setae: (in – in) (48 µm)> (le – le) (44 µm)> (le – in) (37 µm)> (ro – ro) (35 µm)> (ro – le) (25 µm).

Notogaster — Pteromorphs movable, without acute angle, not extending anteriorly beyond level of arched dorsosejugal scissure. Ten pairs of notogastral setae short smooth setiform; variable in number, namely one specimen without poir of p 2. Four pairs of saccules present: Sa and S1 situated anterior-laterally to lm and lp, respectively; S2 immediately postero-laterally to h 2; S3 lateral to h 1. Opening gla situated lateral to lp. Lyrifissures ia aligned nearly along joint of notogaster and pteromorph; im obliquely antero-laterally to S1; ip perpendicular to notogastral outline behind h 2; ih and ips obliquely. Relative distances among central notogastral setae: (lm – lm) (96 µm) ≈ (h 2 – h 2)> (lp – lp) (87 µm)> (lm – lp) (73 µm)> (lp – h 2) (58 µm).

Ventral region — Genital (48 µm) and anal (67 µm) apertures roughly circle in form; length of anal aperture about 1.4x as long as that of genital aperture; distance (100 µm) between them about twice as long as length of genital aperture ( Fig. 23B ). Genitoanal setae: 4-1-2-3; all setae smooth, thin setiform. Setae g 1, g 2 remote from g 3, g 4. Setae ag inserted latero-posteriorly to genital aperture. Setae an 1 inserted near the mid-ventral line shorter than an 2. Setae ad 1 aligned in latero-posteriorly to aperture; ad 2 in adanal position; ad 3 in preanal. Lyrifissures iad located at level of insertions of setae an 2, along outline of aperture. Sternal ridge and bo 4 indistinct. Epimeral borders bo. 1-3, sj interrupted medially. Epimeral setal formula: 3-1-3-3; all setae short, thin, simple ( Fig. 24 ).

Diarthric subcapitulum bearing 3 pairs of setae; all setae sparsely, minutely barbed ( Fig. 23D ). Pedipalpal setal formula: 0-2-1-3-9[1]; solenidion thick, originating from apophysis ( Fig. 23F ). Relative lengths of ventral and subcapitular setae ad (23 µm)> m (20 µm)> a (19 µm)> 1 a (17 µm)> ag (15 µm)> an (14 µm)> g ≈ h (13 µm).

Legs — Heterotridactylous; claws minutely dentate. Setal formula: I (1-5-3-4-18), II (1-5-3-4-16), III (2-3-1-3-14), IV (1-2-2-3-12). Trochantera IV bearing carina terminating in fine point dorsally and ventrally ( Fig. 23E ). On tarsus I, famulus ε bacilliform situated posterior to ω 2 and lateral to 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 contiguous to ’ 1 ( Fig. 23G ).

Remarks — The new species is similar in form of rostrum and sensilli, length of notogastral setae and size of lamellae to Haplozetes angustus ( Hammer, 1967) and H. nudus ( Hammer, 1961) . However, the new species differs from them in having sacculi S2 posterior to setae h 2 and their mutual distance of lp smaller than those of lm and h 2.

Figures

FIGURE 23: Haplozetes makii sp. nov. A, Dorsal view; B, Ventral view; C, Bothridial region; D, Setae; E, Trochanter IV; F, Pedipalp; G, Tarsus and tibia of leg I.

FIGURE 24: Haplozetes makii sp. nov. A part of left epimeral region.

FIGURE 22: Protoribates hirokous sp. nov. A, Gnathosomal region; B, Solenidial region on tarsus and tibia of leg I; C, Tibia II (narrow arrow: spur); D, Chelicera.