Sejidae

Abstract: Sejus manualkrantzi (Acari: Mesostigmata: Sejidae) is synonymized with S. krantzi and is assigned to a new genus, Adenosejus.

Abstract: This paper describes the first record of the Sejida (= Sejina) family Sejidae (superfamily Sejoidea) from Burmese amber, based on deutonymphs. Specimens were found in the amber piece along with a wasp (Hymenoptera: Scelionidae), flies (Diptera: Ceratopogonidae) and thrips (Thysanoptera: Adiheterothripidae). This record traces the Sejida (= Sejina) back to the mid-Cretaceous (ca. 100 Ma) and represents not only the oldest valid record of Mesostigmata, but it is also one of the oldest examples of the entire Parasitiformes clade.

Abstract: Species diversity, effect of edaphic mesostigmatid mites and their feeding habits on natural equilibrium of soil creatures is very important and of indices of changes in ecosystems. In this study, our goals were collecting and evaluating of diversity of soil specimens in four sights of Arasbaran forests in summer 2013. Biodiversity indices of Shannon, Simpson and Brillouin in addition to evenness index of Simpson, Camargo and Smith-Wilson calculated by means of ecological methodology 6.0 software. Our results revealed that the maximum relative abundance belongs to Veigaia nemorensis (Koch, 1836) with 11.54% andVeigaia planicola (Berlese, 1882) with 8.34% both from Veigaiidae family and minimum belongs to Sejus sp. from family sejidae with 0.17%. Maximum rate of Shannon’s and Simpson’s diversity was respectively 4.61 and 0.97 in Kalaleh area, with maximum collected species number rate of Simpson’s evenness index also belongs to this area with 0.65 percent. The high frequency of mites of family Veigaiidae can be attributed to their strength of predatory and fauna richness in the soil.