Macrocheles wainensis Dwibadra and Takaku, 2014

Dwibadra, Dhian, Takaku, Gen, Ôhara, Masahiro & Ueda, Akira, 2014, Mites of the Family Macrochelidae (Acari: Gamasida) from Sungai Wain, East Kalimantan, Indonesia, Species Diversity 19 (1), pp. 43-57 : 50-53

Macrocheles wainensis Dwibadra and Takaku sp. nov. ( Fig. 3 )

Type series. Holotype ( MZB. Acar. 7562): female, Hutan Lindung Sungai Wain, Balikpapan , East Kalimantan, 20 December 2006, ex O. semicupreus, A. Ueda and D. Dwibadra leg . Paratypes: SWPF: 1 female, 16 December 2006, ex residue in vial; 1 female, 17 December 2006, ex O . semicupreus; 1 female, 18 December 2006, ex O. semicupreus ; 2 females, 20 December 2006, ex O. semicupreus and Phaeocroops sp.; Km 24: 1 female, 21 December 2006, ex O. dux ; 2 females, 26 December 2006, ex O. rudis and residue in vial; 1 female, 5–10 December 2008, ex residue in vial.

Description. Female. Length of dorsal shield 674 (640– 740), width at level of coxae II 417.5 (400–460) (n =10). Specimens yellowish brown in color.

Dorsum ( Fig. 3A ). Dorsal shield oval, attenuate posteriorly, strongly punctate laterally; punctation and reticulation indistinct in center of anterior half; lateral margin of shield smooth; shield bearing 28 pairs of dorsal setae and 22 pairs of pores; seta j1 pilose distally; z1 simple and reaching to insertion of j2; j5, j6, z5, z6, and J2 simple; other setae pilose entirely or in distal 2/3; some podonotal setae (e.g., z4–6) inserted on tubercles.

Venter ( Fig. 3B ). Sternal shield wider than long; length 139.5 (130–150), width at level of coxae II 154 (150–160) (n =10); shield with 3 pairs of simple setae and 2 pairs of pores; l. ang present; l. arc. and l. m. t. present as punctate transverse line; paired a. p. l. present; l. o. p. present as punctate line; a. p. p. producing scattered punctations and not reaching to l. m. t. Metasternal shields oval and free; each shield with 1 simple seta and anterior pore.

Width of epigynial shield 171.5 (160–185) (n =10); shield ornamented with punctuations and one pair of simple setae on the posterior corner.

Ventrianal shield longer than wide, length 234.5 (220– 245), width 200.5 (185–220) (n =10); shield ornamented with semiconcentric lines and reticulation; 3 pairs of preanal setae, 1 pair of paranal setae, and 1 postanal seta present; postanal seta pilose and other setae simple; cribrum located posterior to postanal seta.

Gnathosoma ( Fig. 3C ). Well developed and sclerotized. Features of gnathosoma, epistome ( Fig. 3E ), and chelicerae ( Fig. 3D ) similar to those of Macrocheles riparius . Length of fixed digit 198.5 (190–205) and that of movable digit 65.5 (63.8–67.5) (n =10).

Legs. Most leg segments with simple and pilose setae except for coxae I, III, and IV; trochanter I and tarsus I with only simple setae. Leg chaetotaxy typical for this genus. Genu IV with 6 pilose setae. Leg length (excluding ambulacrum, n =10); leg I, 521.5 (490–550); leg II, 518 (490–560); leg III, 476.8 (450–500); leg IV, 691.5 (620–770).

Sacculus foemineus ( Fig. 3F ). Very similar to that of Macrocheles riparius .

Male and other stages. Unknown.

Etymology. This specific name is derived from the type locality.

Remarks. M. wainensis is a member of the glaber species group. The pattern of sternal ornamentation in M. wainensis is similar to that of M. nataliae Bregetova and Koroleva, 1960 from Slovakia, as illustrated by Mašán (2003). Most of the dorsal setae are more or less pilose in M. wainensis whereas setae j1, r2–r4, J5, Z4, Z5, and S5 are pilose and the other setae are simple in M. nataliae . There is some variation in the distribution of pilose setae in M. nataliae , as was noted in the drawing and description by Bregetova and Koroleva (1960), and as has been discussed by Hyatt and Emberson (1988). Also the pilose setae of specimens from Kalimantan are stronger in pilosity and mostly inserted in the tubercles. The dorsal setae in the present species are similar in shape to those of M. sukabumiensis Hartini and Takaku, 2003 ( Hartini and Takaku 2003a), but the shapes of j5, j6, z5, z6, and J2 differ. Those setae are simple in M. wainensis , but pilose in M. sukabumiensis .

Figures

Fig. 3. Macrocheles wainensis Dwibadra and Takaku, sp. nov., female, holotype (MZB. Acar. 7562). A, dorsal shield; B, ventral shield; C, ventral view of gnathosoma (paratype, MZB. Acar. 7564); D, chelicera (paratype, MZB. Acar. 7563); E, tectum; F, sacculus foeminus (paratype, MZB. Acar. 8217). Scale bars: 100µm (A, B); 50µm (C–F).