The species was first described by Embrik Strand in 1907 from specimens collected in Okinawa.[2] Several other species have since been synonymized with T. okinawensis, including Thomisus formosae Strand, 1907, Thomisus picaceus Simon, 1909, and Thomisus formosanus Bonnet, 1957.[1][3]
The species is commonly found in agricultural habitats, particularly rice fields, where it has been collected from rice, mungbean, soybean, and maize crops.[4] Males can be found almost year-round, with collection records spanning from January to October.[4]
Thomisus okinawensis exhibits significant sexual dimorphism, with females being much larger than males.[4]
Males have a total length of approximately 3.3 mm, with a yellowish-brown cephalothorax featuring a distinctive white transverse ridge in the eye region that forms lateral tubercles. The legs are light brown to yellowish-brown with dark brown banding patterns on various segments. The abdomen is yellowish-brown with pale brown spots and transverse striations.[4]
Females are considerably larger, reaching up to 10.4 mm in total length. They have a yellowish-brown cephalothorax with a distinctive V-shaped white band and white markings in the eye region. The legs show yellowish-brown coloration with white patches on various segments. The abdomen is typically white with five spherical brown spots and a pair of lateral tubercles. The epigynum appears as a simple sclerotized black plate.[4]
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