Arrenurus

Esen, Yunus, Erman, Orhan & Dilkaraoglu, Sibel, 2013, Contribution to the study of arrenuroid water mites (Acari: Hydrachnidia) from Turkey, Zootaxa 3666 (1), pp. 73-83 : 76-80

Arrenurus (s.str.) antalyensis Gülle, Boyacı & Gülle, 2011

Material examined: Antalya Province, Yaman Marsh, 36°.52.52' N 30°.59.50' E, 21.viii.1998, (1/0/0), leg. Erman; Kahramanmaraş Province, Pazarcık, Lake Baġlama, 37°.16.52' N 37°.07.30' E, 555 m a.s.l., 12.ix.2012, (3/1/0).

Description. Male: Idiosoma (in parentheses measurements of the male specimen collected from the type locality) 1362 (1226) long (including petiole) and 900 (786) wide. Anterior margin of body concave, dorsal shield incomplete, passing onto cauda, dorsal shield W 480–552 (fig. 3A). Dorsal humps well developed, and tip of the humps slightly directed anteriorly, D3 on humps, L4 on large humps, cauda distinct, well set off from anterior idiosoma, pygal lobes very short (fig. 3B). Gonopore L 90 (85), genital plates extending onto lateral idiosoma. Medial distance of fourth coxal plates large (fig. 3C). Hyaline membrane trapezoid, posterior margin slightly concave. Petiole posteriorly enlarged, L 146 (140), maximum W 126 (120). Ligulate process drop-shaped, extending far beyond posterior margin of petiole; posterior margin of ligulate process rounded. Associated setae of petiole extending beyond posterior margin of ligulate process (fig. 3D). Capitulum ventral L 162, chelicera L 197. Palp (fig. 3E) total L 409, dL of palp segments: P-1 40, P-2 100, P-3 86, P-4 115, P-5 68. P-2 medially with six setae. Swimming setae on leg segments; II-L-3: 6, II-L-4: 3, II-L-5: 4, III-L-3: 7, III-L-4: 8, III-L-5: 7, IV-L-3: 7, IV-L-4: 8, IV-L-5: 9. IV-L-4 with a spur. Dorsal L of I-L:77-100-118-172-180-269, IV-L-4-6: 428-158-200.

Female: Idiosoma L/W 1281/1156, anterior margin of body straight, posterolateral corners distinct, dorsal shield L/W 895/800. Gonopore L/W 152/205, genital plates large and wide, slightly enlarged in the middle, genital field close to posterior margin of Cx-4. Medial distance of fourth coxal plates as wide as one genital valve. Genital field W 654. Excretory pore very close to genital field, far anteriorly of associated setae. Capitulum ventral L 190, chelicera L 230. Palp (fig. 4B) total L 362, dL of palp segments: P-1 40, P-2 84, P-3 63, P-4 110, P-5 65. P-2 medially with six setae. Dorsal L of I-L: 95-90-142-178-174-204, IV-L-4-6: 265-231-244.

Records from Turkey: Antalya Province (Gülle et al. 2011).

Remarks. The illustrations of Gülle et al. (2011) did not describe the most important characteristics of A. antalyensis , and in our opinion there are some mistakes in the measurements of the petiole of this species. Examination of one male specimen from the type locality and specimens of Kahramanmaraş Province show that the dorsal humps are not fused distally, the petiole is wider, and P-2 has medially 6–7 setae. Some of the measurements of the petiole provided in the original description (in parentheses) differ considerably from our measurements: petiole L/W 140/120 (125–129/89–92). Other measurements of the holotype and the paratype do not differ remarkably from the values given here. Furthermore, the illustration of the palp was probably drawn laterally, because P-2 is with one seta, while the sword seta of P-4 is clearly visible, which must be an error.

The male of A. antalyensis is similar to that of A. distans due to the short pygal lobes, the enlarged petiole posteriorly, the trapezoid hyaline membrane and it’s concave posterior margin. However, A. distans differs from A. antalyensis by having a pointed posterior margin to the ligulate process which itself only slightly extends beyond the posterior margin of the petiole (in A. antalyensis the ligulate process extends far beyond the posterior margin of the petiole). In lateral view, the petiole of A. distans is narrowed posteriorly (see Smit et al. 2000, fig. 8) whilst that of A. antalyensis is enlarged posteriorly and the associated setae of the petiole of A. distans do not reach the petiole posterior margin.

The female of A. antalyensis is easily distinguished from all other species by the excretory pore lying very close to genital field and far anteriorly of associated setae. This character is unknown in other species of the subgenus Arrenurus . Palp shape and setation are in perfect agreement with the male of this species. Furthermore, due to the distinct posterolateral corners and wide genital plates, A. antalyensis females are similar to those of A. ovatipetiolatus but differ in the genital plates which are wider in the middle; the wider medial distance of the fourth coxal plates and the genital valves with narrow triangular sclerotized patches.

Arrenurus (s.str.) kermanensis Peši ć, Smit & Asadi, 2011

Material examined: Mersin Province, Tarsus, Berdan Dam, 36°.57.47' N 34°.53.46' E, 35 m a.s.l., 19.viii.1999, (4/ 2/0), leg. Erman; Kahramanmaraş Province, Çaġlayancerit, Lake Deġirmen, 37°.43.18' N 37°.29.10' E, 880 m a.s.l., 11.ix.2012, (6/5/0).

Description. Male: Idiosoma 934–1000 long (including petiole) and 688–702 wide. Anterior margin of body straight to slightly concave, dorsal shield incomplete, passing onto cauda, dorsal shield W 422–446. Dorsal humps small, cauda distinct, well set off from anterior idiosoma, pygal lobes well developed and directed posterolaterally (fig. 5A). Gonopore L 78–80, genital plates extending to lateral body margin. Medial distance of fourth coxal plates smaller than width of gonopore (fig. 5B). Hyaline membrane trapezoid, widest at base, strongly narrowed posteriorly, posterior margin slightly concave. Petiole L 210–218, posterolaterally with a hyaline extension, tip of hyaline extension narrowed or pointed. Associated setae of petiole extending beyond posterior petiole margin (fig. 5C–D). Capitulum ventral L 134, chelicera L 178. Palp (fig. 5E) total L 330, dL of palp segments: P-1 37, P-2 83, P-3 65, P-4 92, P-5 53. P-2 medially with five setae. Swimming setae on leg segments: II-L-3: 4, II-L-4: 5, II-L-5: 6, III-L-3: 4, III-L-4: 7, III-L-5: 6, IV-L-3: 4, IV-L-4: 6, IV-L-5: 7. IV-L-4 with a spur. Dorsal L of I-L:62-80-111- 127-144-190, IV-L-4-6: 374-132-112.

Female: Idiosoma L/W 841–1052/726–905, posterolateral corners slightly distinct, anterior margin of body straight (fig. 5F). Medial distance of fourth coxal plates smaller than width of one genital valve. Posteromedial corners of fourth coxal plates absent. Genital valves with small triangular patches. Gonopore L/W 134–142/151– 160, genital field W 510–552. Capitulum ventral L 152, chelicera L 170, palp total L 373, dL of palp segments: P- 1 36, P-2 98, P-3 75, P-4 110, P-5 54. Swimming setae on leg segments: II-L-3: 4, II-L-4: 5, II-L-5: 6, III-L-3: 4, III-L-4: 6, III-L-5: 9, IV-L-3: 4, IV-L-4: 7, IV-L-5: 8. Dorsal L of I-L:59-72-100-132-134-128, IV-L-4-6: 158-167- 190.

Remarks. The original description of the male of A. kermanensis was based on a specimen which was not completely sclerotized (Pešiċ et al. 2011). Therefore, some differences are found between the holotype and the well sclerotized specimens from Turkey. Compared with the holotype, the specimens from Turkey are characterized by the straight or slightly concave anterior idiosoma margin, a distinct cauda, pygal lobes well developed, the posterior margin of the hyaline membrane concave and tip of butterfly nut-shaped extention of the petiole narrowed posterolaterally. The females of this study have a complete dorsal shield and gonopore valves with small triangular patches (in the original description a single female specimen has an incomplete dorsal shield, and the gonopore valves have medially fused sclerotized patches).

This record shows that A. kermanensis has a wider distribution area. Up to now the species only known from the type locality in southern Iran.

Distribution. Iran (Pešiċ et al. 2011). New for Turkey.