Scaptognathus magnus (Acari: Halacaridae), a New Record from Korea

Abstract

An arenicolous halacarid, Scaptognathus magnus Abé is first recorded from Korea, which was collected from littoral coarse sandy bottom around Simnibawi Rock off Gangreung in the east coast of South Korea. The remarkable characteristics of this species are large body with idiosoma more than 470 μm long, nearly trapezoidal anterior dorsal plate, and a unique chaetotaxy of bipectinate setae 5-3-3-3 on tibiae I-IV. The characteristics of Korean specimens coincide well with the original description from Hokkaido, Japan, except for the number of parambulacral setae on tarsus III and the weak median claws. Detailed illustrations and scanning electron microscope photographs based on Korean specimens are provided.