New subgenera and a new species of the genus Raphignathus Dugès (Prostigmata, Raphignathidae), with taxonomic notes on the genus Neoraphignathus Smiley & Moser.

Four new subgenera in the genus Raphignathus Dugès are hereby proposed: Raphignathus (Raphignathus), subgen. nov., Raphignathus (Monoraphignathus), subgen. nov., Raphignathus (Diraphignathus), subgen. nov., and Raphignathus (Triraphignathus), subgen. nov. These subgenera are diagnosed by the number of setae on the interscutal membrane of females. A new species, R. (D.) neohecmatanaensissp. nov., is described and illustrated based on females collected from Ziziphusspina-christi Mill. (Rhamnaceae). The taxonomic status of the monotypic genus Neoraphignathus Smiley & Moser and three species (R.evidus, R.hsiufui, and R.johnstoni) are discussed. A key to world species of the family Raphignathidae is given.

A new species of the genus Diptilomiopus Nalepa and a key to diptilomiopid species (Prostigmata; Eriophyoidea; Diptilomiopidae) associated with Moraceae plant family.

The subfamily Diptilomiopinae Keifer and the genus Diptilomiopus Nalepa (Prostigmata; Eriophyoidea; Diptilomiopidae) are recorded for the first time from Saudi Arabia with the description and illustration of a new species, D. bahaensis sp. nov., collected from Ficus carica L. (Moraceae). Additionally, a key to diptilomiopid mite species reported from the plant family Moraceae is provided, along with their distribution and habitus to the host plants.

The spider mites of the genus Eutetranychus Banks (Acari, Trombidiformes, Tetranychidae) from Saudi Arabia: two new species, a re-description, and a key to the world species.

Two new species of the genus Eutetranychus Banks are described and illustrated based on adult females and males, E.spinosus sp. n. from Indigoferaspinosa Forssk (Leguminosae), E.neotransversus sp. n. from Juniperusprocera Hochst. ex Endl. (Cupressaceae), and E.palmatus Attiah, 1967 is redescribed from Washingtoniarobusta H. Wendl. (Arecaceae). Additionally, the intraspecific morphological variations within E.orientalis populations, collected from 28 various host plants and 80 different localities from six regions of Saudi Arabia from 2009 to 2017, are discussed and presented. The genus Eutetranychus is divided into two species groups based on the presence of one seta (orientalis group) or two setae (banksi group) on coxa II. In addition, seven Eutetranychus species are suggested as synonyms of E.orientalis (Klein, 1936) and E.papayensis Iqbal & Ali, 2008 is considered as species inquirenda. A key to all known species of the genus Eutetranychus is provided.