Atractides (Tympanomegapus) sulawesiensis, Pesic, Vladimir & Smit, Harry, 2009

Pesic, Vladimir & Smit, Harry, 2009, New records of water mites of the genus Atractides Koch, 1837 (Acari: Hydrachnidia, Hygrobatidae) from Thailand, Malaysia and Sulawesi (Indonesia), with the description of four new species, Zootaxa 2240, pp. 1-30 : 27-30

Atractides (Tympanomegapus) sulawesiensis sp. nov.

( Figs. 20A–B , 21A–C )

Atractides neoclipeatus (non Lundblad, 1971) — Smit (1996) Type material. Holotype: female dissected and slide mounted in Hoyer's fluid. INDONESIA, Sulawesi Utara: S. Tumokang, at park headquarters, Dumoga-Bone NP, 9.iv.1990, leg. Smit. Paratype: one female, S. Toput, tributary of S. Tumokang, 23.iv.1991, leg. Smit.

Diagnosis. Gnathosoma elongated; P-4 sword seta pointed, little enlarged, but not hair-like; P-5 with ‘cheeks’; leg claws with dorsal clawlets.

Description. General features. Integument dorsally striated. Muscle attachment plates unsclerotized. Coxal field: caudal margin of Cx-1+2 medially tongue-shaped, apodemes of Cx-2 forming an acute angle. Genital field: Ac in triangular arrangement; excretory pore smooth; Vgl-1 fused with Vgl-2. Palp: P-4 with straight and equally curved dorsal margin, sword seta of P-4 pointed, little enlarged, but not hair-like, inserted near distoventral hair, P-5 with ‘cheeks’. I-Leg: little modified, S-1/2 close together, S-1 slightly curved inwards with blunt tip, S-2 with pointed, stiletto-like tip.

Female (holotype, in parentheses some measurement of paratype): Idiosoma L/W 763/631. Coxal field ( Fig. 20A ): L 358, Cx-3 W 416, Cx-1+2 mL 106, Cx-1+2 lL 253. Palp ( Figs. 21 A-B): palp total L 327 (329), dL: P-1 56 (53), P-2 66 (70), P-3 71 (71), P-4 101 (102), P-5 33 (33); %L: P-1 17.1 (16.1), P-2 20.2 (21.3), P- 3 21.7 (21.6), P-4 30.9 (31.0), P-5 10.1 (10.0); L P-2/P-4 0.65 (0.69); chelicera ( Fig. 21C ) total L 296 (329), basal segment L 256 (247), claw L 98 (109), L ratio basal segment/claw 2.6 (2.3), capitulum ( Fig. 21A ) ventral L 268. Genital field ( Fig. 20A ): pre – and postgenital sclerites strong, L/W 141/169, genital plate L 95- 100, L Ac-1-3: 33-37-34.

I-Leg ( Fig. 20B ): I-Leg-5 dL 153 (155), vL 115 (119), dL/vL 1.33 (1.3), HB 36 (34), dL/HB 4.3 (4.6), S-1 L 56 (52), L/ W 12.3 (11.3), S-2 L 56 (58), L/ W 10.6 (8.5), distance of sword setae at I-Leg-5 5 (4), L S-1/2 1.0 (0.9); I-Leg-6 L 114 (117), HB 22 (21), L/HB 5.2 (5.5); L I-Leg-5/6 1.34 (1.32).

Male. Unknown.

Remarks. Due to the presence of elongated capitulum and a little enlarged, not hair-like sword seta on P- 4, the new species resembles Atractides neoclipeatus Lundblad, 1971 from Java, Indonesia. Atractides sulawesiensis sp. nov. can be distinguished easily from A. neoclipeatus in the presence of ‘cheeks’ on P-5 and dorsal leg clawlets.

Atractides talinarostris Cook, 1967 (Maharashtra, India), a species similar in having dorsal leg clawlets and an enlarged, not hair-like sword seta on P-4, differs in the absence of ‘cheeks’ on P-5 and a less elongated capitulum.

Atractides clipeatus ( K. Viets, 1935) (Sumatra, Indonesia), A. jukii Cook, 1967 (Maharashtra, India) and A. latisetus Jin, 1997 (Guizhou, China) differ from A. sulawesiensis sp. nov., in the absence of dorsal leg clawlets, less elongated capitulum, unfused Vgl-1and -2 and presence of hair-like sword seta on P-4. The two later species differ additionally in the absence of ‘cheeks’ on P-5.

Within the Western Palaearctic region, due to narrow setal interspace, presence of dorsal clawlets on leg claws, fused Vgl-1+2 and the enlarged sword seta on P-4, Atractides sulawesiensis sp. nov., is most similar to A. moniezi ( Motaş, 1927) , a species known from Central Europe and Russia ( Gerecke 2003), but differs from it in the presence of ‘cheeks’ on P-5 (without lateral ‘cheeks’ in A. moniezi ) and more more elongated capitulum.

Etymology. The species is named after the Sulawesi, where this species was collected.

Distribution. Sulawesi.

Figures

FIGURE 20 A – B. Atractides sulawesiensis sp. nov., female holotype: A = coxal and genital field; B = I-Leg- 5 and - 6. Scale bars = 100 μm.

FIGURE 21 A – C. Atractides sulawesiensis sp. nov., female (A - holotype; B-C – paratype): A = capitulum and palps; B = palp, lateral view; C = chelicera. Scale bars = 100 μm.