Mediostoma izmirica Snegovaya, Kurt & Yağmur, 2016, sp. nov.
Creators: name: Snegovaya, Nataly Yu.
name: Kurt, Kemal
name: Yağmur, Ersen A.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Opiliones
Nemastomatidae
Mediostoma
Mediostoma izmirica

description: Mediostoma izmirica sp. nov.
Figures 2–11, 14, 17, 20, 23, 26-28, 31, 32, 37
3.1. Type of material
Holotype ♂ (GUSAL): TURKEY, İzmir Province, Kemalpaşa District, Nif Mountain, 21 Oct. 2012, 38°22′33.9″N, 27°22′53.3″E, 1510 m; leg. E. A. Yağmur.
Paratypes: 2 ♀♀ (GUSAL), 1 ♀ (RCNS), 1 ♂ used for SEM (RCNS), same region as the holotype.
3.2. Etymology
The new species is named after the type locality, İzmir, a province of Turkey from the Aegean Region, with the Latin suffix - ica.
3.3. Diagnosis
Tergites I–IV with a pair of low, cylindrical tubercles; pseudo-articulations of legs: I - 0, II - 1, III - 1, IV - 2; meso-apical portion of pedipalp patella with large recurved hook-shaped tooth; basichelicerite with high and wide dorsal apophysis with small and deep depression, covered with different long setae; glans of penis with long pinnate wings.
3.4. Description
Based on holotype. Measurements: Body length 1.6 mm, width 1.1 mm. Body is ovoid, slightly constricted towards the level of legs IV (Figures 2, 3, 4, 11). Body integument with papillae. Tergites I–IV are a pair of low, cylindrical tubercles (Figures 2, 11, 17). Eye tubercle is very low and slightly elongated, 0.2 mm in diameter, shifted forward to the frontal edge of the carapace, with numerous small blunt tubercles (Figure 14). Leg short, II and IV thinner and longer than I and III (Table 1). All legs are covered with the setae and with small comb tooth like denticles (Figures 20, 23). Femoral pseudo-articulations as follows: I - 0, II - 1, III - 1, IV - 2. Pedipalp short, covered with setae (Figures 5, 26). Tibia and tarsus covered with club-shaped setae. Meso-apical portion of patella with curved, hook-shaped tooth (Figures 27, 28). Chelicerae small and covered with different sized setae (Figures 6, 31); basichelicerite with a high and wide dorsal apophysis, covered with differently sized long setae (Figure 32). Distal segment is also covered with setae. Chelicera: basichelicerite 0.4 mm long, distal segment 0.45 mm. Penis is short, 0.9 mm, with apical part typical for genus, but has long pinnate wings (Figures 7–10, 37).
Female body length is 2.0 mm, width 1.6 mm (Figure 4). Chelicera: basichelicerite 0.6 mm, distal segment 0.5 mm. Female differs from male by following features: larger body size, absence of dorsal apophysis on basichelicerite, and pedipalpal patella without hook-shaped tooth (Table 1).
3.5. Comparisons with other species of Mediostoma Mediostoma izmirica sp. nov. is easily distinguished from the great majority of species of the genus by the presence of a large recurved hook-shaped tooth in the meso-apical portion of the pedipalpal patella on males. A similar type of tooth-like structure is also present in Mediostoma stussineri (Simon, 1885), but M. izmirica sp. nov. differs from M. stussineri by a different form of sculpturing of the leg I femur (Mitov, 2002: fig. 5), shape of cheliceral apophysis, pseudo-articulation count on legs’ femora (in M. stussineri: I - 10, II - 21, III - 10, IV - 17) (Roewer, 1923: p. 137-138, fig. 18), and, finally, the shape and ornamentation of the penis glans (Mitov, 2002: figs. 2-3, 6-8). The new species differs from Mediostoma humerale (C. L. Koch, 1839) by a different form of sculpturing of the leg I femur (Gruber, 1976: fig. 17), shape of cheliceral apophysis, and, finally, the shape and ornamentation of the penis glans (Gruber, 1976: figs. 18-19; Mitov, 2002: figs. 9-10). We also present comparative material in Table 2 where we compare characteristic properties of the new species with the two other Mediostoma species.
description: Published as part of Snegovaya, Nataly Yu., Kurt, Kemal & Yağmur, Ersen A., 2016, Mediostoma izmirica sp. nov.: a new harvestman species (Arachnida, Opiliones, Nemastomatidae) from Turkey, pp. 489-498 in Turkish Journal of Zoology 40 (2) on pages 490-495, DOI: 10.3906/zoo-1412-10, http://zenodo.org/record/13200912