Oxidae K. Viets 1926

• Main Author: Tuzovskij, Petr V.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Trombidiformes; Oxidae; Anadyr; Anadyr’; Kramer; Magadan; Anadyr'; Tundra
• Online Access: https://zenodo.org/record/6160823; https://doi.org/10.5281/zenodo.6160823

Family Oxidae K. Viets, 1926 Genus Oxus Kramer, 1877 Oxus nodigerus Koenike, 1898 (Figs 30–39) Material examined. Larvae (n = 33) were reared from six females: one female collected in a tundra pool near the village of Markovo, Anadyr District, Magadan Province, 26 June 1981; five females collected in a forest bog near the village Postyltsevo, Nekouz District, Yaroslavl Province: one female collected on 13 July 2000, two females on 21 July 2000, one female on 17 May 2005 and one female on 9 June 2006. The duration of the embryonic period was 11–15 days. Diagnosis. Idiosoma narrow, dorsal plate elongated (L/W ratio 1.5–1.7), setae Oe, Hi, He, Sci and Sce equal in length, trichibothria Fp and Oi not branched; eye platelets with rounded posterior margins; excretory pore plate slightly longer than wide (L/W ratio 1.15–1.25); setae Ae and Ai nearly equal in length; II–Leg- 4 and III–Leg- 4 with two short greatly thickened setae. Description. Idiosoma flat, dorsal plate (Fig. 30) elongate (L/W ratio 1.5–1.7), narrow anteriorly, widest near bases of setae Hi. In unengorged larvae covering large part of dorsum, with convex lateral margins, its anterior margin slightly concave, rounded posteriorly. Dorsal plate bearing five pairs of setae: three pairs of simple setae (Fch, Vi, Hi) and two pairs of trichobothria (Fp, Oi). Simple setae long and thick, Hi longest, Fch shorter and thinner than Vi; both pairs of trichobothria short and thin, equal in sizes and not branched. Seven pairs of setae (Oe, He, Sci, Sce, Li, Le, Si) situated on soft wrinkled membrane: Oe longest, Si shortest. Coxal plates large, plates II–III on each side completely fused to each other, suture line between them developed only in their lateral parts (Fig. 31). Anterior coxal plates completely separated from coxal plates II and III. All coxal setae (C 1 –C 5) approximately equal in length. Setae Ci very long, located on small tubercles and much longer than Se. Pre-anal setae relatively short, but Pe longer than Pi. All coxal plates have reticulated ...