Euroschizogynium calvum Trach & Seeman, 2014

Nemati, Alireza & Khalili-Moghadam, Arsalan, 2018, First species record of Schizogyniidae (Acari: Mesostigmata: Trigynaspida) from Asia, Persian Journal of Acarology 7 (1), pp. 101-104 : 102

Euroschizogynium calvum Trach & Seeman, 2014

This is the first record of the genus and species from Asia.

Diagnosis ( Figs. 1–4 )

Dorsal shield hypotrichous. Female sternal shield fused with metasternal shields ( Figs. 1–3 ), with four pairs of setae. Female latigynal, mesogynal and anal shields fused with a ventral shield ( Figs. 1, 3 ). Ventral shield with the large pre-anal membranous region ( Fig. 4 ), ventromarginal shields large, free. Peritrematal shields fused with exopodal and endopodal shields. Gnathosoma with four pairs of setae. Setae ad1 and pd1 on tarsi II–IV bifurcated.

Note – Morphological characters of Iranian specimens of this species are nearly similar to those explained in Trach and Seeman (2014), except some sizes ( Table 1) and epistome ( Fig. 2 ), which is fairly denticulate in Iranian specimens (European specimens have an epistome with smooth anterior margin). The sizes of some morphological characters of Iranian specimens are provided in Table 1. For convenience, the same measurements, as described in the main description of this species ( Trach and Seeman 2014), are listed in Table 1.

Iran's specimens are bigger in dorsal shield length but have a smaller sternal shield width. In these specimens, the width of the ventrianal shield in different parts (between and posterior of the fourth coxae) is somewhat wider than those in European specimens, while other measurements are nearly similar ( Table 1).

materials (n = 2) and Iranian specimens (n = 2).

Figures

Figure 4. Euroschizogynium calvum Trach & Seeman, 2014 – Large pre-anal membranous region (scale bar = 100 μm).

Figures 1–3. Euroschizogynium calvum Trach & Seeman, 2014 – 1. Ventral view of idiosoma; 2. Epistome; 3. Sternal and latigynial shields (scale bars = 100 μm).