Barbaxonella bingolensis, Esen, Yunus, Pešić, Vladimir & Erman, Orhan, 2011

Esen, Yunus, Pešić, Vladimir & Erman, Orhan, 2011, Water mites of the family Aturidae Thor, 1900 from Turkey (Acari: Hydrachnidia), with description of two new species, Zootaxa 2746, pp. 25-42 : 37-40

Barbaxonella bingolensis sp. nov.

( Figs. 9A–D , 10A–F )

Type series. Holotype: male, dissected and slide-mounted in Hoyer's fluid, Bingöl Province, Genç, Kale stream, 38°31'41"N 40°32'40"E, 920 m asl., 19.vii.2010. Paratypes: same data as holotype, (4/5/0); ibid., 04.viii.2010, (7/ 23/0).

Further records. Bingöl Province, Kupar stream, 38°44'31"N 40°32'35"E, 1000 m asl., 19.vii.2010, (0/6/0); ibid., 04.viii.2010, (3/25/0).

Diagnosis. Male: The posterior part of the dorsal shield separated by a transversal ridge, lateral part of ridge anterolaterally directed. The dorsal part of the gonopore with a reversed U-shaped indentation, the ventral part of the gonoporus strongly anteriorly elongated.

Description. Male: Idiosoma L/W 389/270; dorsal shield ( Fig. 9A ) L/W 290/240; dorsal furrow on each side bearing in posterior part three pairs of glandularia platelets. Arrangement of eyes and of the organs in the dorsal furrow, and the structure of dorsal plate are without pecularites. The posterior part of the dorsal shield is separated by a transeversal ridge, lateral part of ridge anterolateraly directed. The dorsal part of the gonopore with a reversed U-shaped indentation surrounded by fine hairs. The densely pilose V-shaped incisions separate the genital area from the lateral part of dorsal shield. Ventral shield ( Fig. 9B ) L/W 390/267, capitular bay L 82; the three acetabula arranged in arc; the ventral part of the gonopore strongly anteriorly elongated, caudally enlarged and flanked by 15–18 fine setae. Palp ( Fig. 10E ) total L 166, dL and %L (in parentheses): P-1 24 (14.5); P-2 39 (23.5); P-3 26 (15.7); P-4 53 (31.9); P-5 24 (12.7); L ratio P-2/P-4, 0.74; capitulum ventral L 83; chelicera total L 120. Legs ( Figs. 10A–D ): dL of I-L: 39-28-43-55-57-54 = 276; dL of II-L: 42-45-38-47-65-70 = 307; dL of III-L: 50-45-41-50-67- 75 = 328; dL of IV-L: 78-58-70-79-90-99 = 474; IV-L-5 with two stout swimming setae.

Female: Similar to male, except in shape and setation of the genital field; idiosoma L/W 422/316, dorsal shield ( Fig. 9C ) L/W 418/236; ventral shield ( Fig. 9D ) (including genital field) L/W 432/305, capitular bay L 81; W between outer margins of acetabular plates 181; acetabular plates fused with the postgenital sclerite; glandularia typically associated with genital field fused with the ventral shield; excretory pore fused with the postgenital sclerite. Palp ( Fig. 10F ) total L 169, dL and %L (in parentheses): P-1 24 (14.2); P-2 40 (23.7); P-3 23 (13.6); P-4 56 (33.1); P-5 26 (15.4); L ratio P-2/P-4, 0.71; capitulum ventral L 90; chelicera total L 96. Legs: dL of I-L: 33-28-40- 54-55-53 = 263; dL of II-L: 40-32-35-48-62-67 = 284; dL of III-L: 45-35-38-49-66-70 = 303; dL of IV-L: 78-49- 60-69-81-80 = 417; leg and palp chaetotaxy as in the male.

Etymology. Named after the province of the type locality.

Discussion. The genus Barbaxonella includes so far five known species: B. ovalis Lundblad, 1954 from Portugal ( Lundblad 1954, 1956) and Spain ( Pešiċ & Gerecke 2003); B. angulata ( K. Viets, 1955) from England ( K. Viets 1955, Gledhill 1964), France (as “ B. pilosa ” Angelier et al, 1963, Smit & Gerecke 2010), Luxembourg ( Gerecke et al. 2005), Czech Republic ( Láska 1962), Bulgaria ( Petrova 1968), Estonia (Smit et al. 2010) and Russia ( Tuzovskij 1979); B. iberica Cook, 1974 from Spain ( Cook 1974); B. spectabilis Gerecke & Meyer, 1989 from Italy ( Gerecke & Meyer 1989, Pešiċ & Gerecke 2003) and B. reverendissima Gerecke, 1994 from Corsica ( Gerecke 1994). Two records of Barbaxonella , based on female specimens, are known outside Europe, from Morocco ( Pešiċ & Gerecke 2003) and Oman (Smit & Pešiċ 2010), but not assigned to any of the known species because at the present state of knowledge, females of this genus cannot be identified ( Pešiċ & Gerecke 2003).

The shape of the heavily chitinized ridge on the dorsal shield and the characteristic shape of the gonopore with the dorsal part bearing a reversed U-shaped indentation and its ventral part strongly anteriorly elongated (vs. dorsal part of the gonopore more or less slit-shaped and ventral part much shorter, not anteriorly elongated in other Barbaxonella species) will separate Barbaxonella bingolensis sp. nov., from all other member of the genus.

Habitat. The specimens of Barbaxonella bingolensis sp. nov. were collected in a sandy/bouldery stream, often shaded by riparian vegetation ( Fig. 11B ).

Distribution. Turkey (Bingöl Province).

Figures

FIGURE 9 A – D. Barbaxonella bingolensis sp. nov., (A – B = male, C – D = female): A = idiosoma, dorsal view; B = idiosoma, ventral view; C = idiosoma, dorsal view; D = idiosoma, ventral view. Scale bar = 100 μm.

FIGURE 10 A – F. Barbaxonella bingolensis sp. nov., (A – E = male, F = female): A = I-L- 1 - 6; B = II-L- 2 - 6; C = III-L- 1 - 6; D = IV-L- 1 - 6; E = gnathosoma and right palp, medial view; F = palp, medial view. Scale bar = 100 μm.

FIGURE 11 A. Sampling site of Javalbia (Javalbicula) turcica (Bingöl Province, Solhan, Masalla Stream). Photos: Yunus Esen.

FIGURE 11 B. Sampling site of Barbaxonella bingolensis (Bingöl Province, Genç, Kale Stream). Photos: Yunus Esen.