First records and new species of Ameronothroidea (Acari, Oribatida) from Brunei

Oribatid mites of the superfamily Ameronothroidea are recorded in Brunei for the first time. A list of five intertidal species representing four genera and two families is presented; of them, three new species—Indopacifica selirongensis sp. nov., Schusteria bruneiensis sp. nov., and Thalassozetes bandarensis sp. nov. (all Selenoribatidae)—are described. Indopacifica selirongensis sp. nov. is characterized by a homogeneous cerotegument, the presence of one pair of slightly oblique ridges in the anterior part of the notogaster, 14 pairs of notogastral setae, three pairs of adanal setae, and obliquely oriented adanal lyrifissure. Schusteria bruneiensis sp. nov. is characterized by a heterogeneous cerotegument, the presence of large, dense cerotegumental tubercles that form clusters on the genital plates and near to the depression on epimere I, well-developed lamellae that are widely separated, a straight anterior margin of the notogaster, fifteen pairs of notogastral setae, one pair of anal setae, two pairs of adanal setae, and obliquely oriented adanal lyrifissure. Thalassozetes bandarensis sp. nov. is characterized by a heterogeneous cerotegument, well-developed lamellae that are widely separated, 15 pairs of notogastral setae, and transversely oriented adanal lyrifissure. Nymphal instars of S. bruneiensis sp. nov. are described; they are characterized by the length of the notogastral seta h2 which is longer than that of the other notogastral setae. SEM micrographs are provided for adults Fortuynia marina, as well as adults and deutonymphs F. smiti.