Tasa koreana

Tasa koreana is a species of jumping spider that was first discovered in North Korea, after which it is named. It was subsequently found in China and Japan. A small spider, between 3.2 and 5 mm (0.13 and 0.20 in) long, it lives on tree trunks and branches. The female was first described in 1981 by the arachnologist Wanda Wesołowska. It has a dark brown or reddish-brown carapace, the upperside of the front part of its body, that has a dense covering of white hair. Behind this is a greyish-brown abdomen that has a pattern formed of dark brown and grey hairs. In some spiders these form chevrons; in others, they form stripes. First described in 1987, the male is mainly dark brown and has less hair than the female, although some spiders have a grey-white abdomen. Its copulatory organs are very similar to the related Tasa davidi. The male's copulatory organ has a spike that has a serrated edge. The female has a distinctive accessory gland internally. Originally described under the name Pseudicius koreanus, later authors transferred the species between several genera, and for a time male and female specimens were matched incorrectly. A 2014 revision linked the sexes and placed the species in the genus Tasa, which is the name generally used today.