Ptocasius
Ptocasius is a genus of Asian jumping spiders that was first described by Eugène Louis Simon in 1885.
The genus name derives from the Greek word πτωχάς, meaning "fugitive".
Description
According to Simon's original 1885 description, Ptocasius is similar to the genus Hasarius but can be distinguished by several morphological characteristics. The cephalothorax is nearly identical to Hasarius but the eye area above is slightly longer, being barely one-quarter wider than long and either parallel or slightly wider posteriorly. Both anterior eye rows are convex. The eyes resemble those of Hasarius, but the posterior eyes of the second series are positioned wider apart from the posterior eyes than from the more distant anterior eyes.
The labial part is much more attenuated than in Hasarius. The chelicerae have an inferior margin furnished with two geminated teeth of very unequal size, with the second tooth being much smaller than the first. In males, the maxillae have an external posterior angular denticulation. The legs are similar to those of Hasarius, but the tibiae and metatarsi of legs I and II bear lateral spines on both sides, while tibiae I and II lack dorsal spines. Legs III and IV have a dorsal spine positioned in a smaller basin. The integument is clothed with simple hairs that are not squamiform.
Simon also noted that Ptocasius is closely related to the genus Cytaea but differs in having a shorter and more elevated cephalothorax, chelicerae with a superior margin provided with two teeth as in Hasarius, two very unequal teeth on the inferior margin, and integuments furnished with simple pubescence rather than the squamous pubescence found in Cytaea.
Species
it contains almost 70 described species, found only in Asia:Ptocasius angulatus Yang & Peng, 2023 – ChinaPtocasius badongensis – ChinaPtocasius bhutanicus – BhutanPtocasius bulbosus – ChinaPtocasius cambridgei – BhutanPtocasius circulus Yang & Peng, 2023 – ChinaPtocasius danzhu Yang & Peng, 2023 – ChinaPtocasius davidi Yang & Peng, 2023 – ChinaPtocasius dian C. Wang, Mi & Peng, 2023 – ChinaPtocasius falcatus – ChinaPtocasius filiformus Yang & Peng, 2023 – ChinaPtocasius foliolatus Yang & Peng, 2023 – ChinaPtocasius fulvonitens Simon, 1902 – Sri LankaPtocasius geminus Yang & Peng, 2023 – ChinaPtocasius gogonaicus – BhutanPtocasius gratiosus G. W. Peckham & E. G. Peckham, 1907 – SingaporePtocasius helvetorum – BhutanPtocasius hubeiensis – ChinaPtocasius hybridus – BhutanPtocasius incognitus – BhutanPtocasius intermedius – BhutanPtocasius jietouensis Yang & Peng, 2023 – ChinaPtocasius kinhi Żabka, 1985 – China, VietnamPtocasius linzhiensis Hu, 2001 – ChinaPtocasius longapophysis Yang & Peng, 2023 – ChinaPtocasius longlingensis Yang & Peng, 2023 – ChinaPtocasius lushiensis – ChinaPtocasius metzneri Patoleta, Gardzińska & Żabka, 2020 – ThailandPtocasius montanus – China, BhutanPtocasius montiformis Song, 1991 – ChinaPtocasius nepalicus – Nepal, ChinaPtocasius nobilis – BhutanPtocasius novus – BhutanPtocasius orientalis – BhutanPtocasius originalis – MyanmarPtocasius paraweyersi Cao & Li, 2016 – China, VietnamPtocasius pilosus – BhutanPtocasius plumipalpis – MyanmarPtocasius pseudoflexus – ChinaPtocasius pulchellus – ChinaPtocasius rectangulus Yang & Peng, 2023 – ChinaPtocasius robustus Yang & Peng, 2023 – ChinaPtocasius sakaerat Patoleta, Gardzińska & Żabka, 2020 – ThailandPtocasius senchalensis – IndiaPtocasius silvaticus – BhutanPtocasius simoni – BhutanPtocasius songi Logunov, 1995 – ChinaPtocasius stemmleri – BhutanPtocasius strandi – BhutanPtocasius strupifer Simon, 1901 – China, VietnamPtocasius subhubeiensis C. Wang, Mi & Peng, 2023 – ChinaPtocasius supinus – BhutanPtocasius tenellus – BhutanPtocasius tengchongensis Yang & Peng, 2023 – ChinaPtocasius tenzingi – NepalPtocasius thakkholaicus – Nepal, ChinaPtocasius thimphuicus – BhutanPtocasius umbellulatus Yang & Peng, 2023 – ChinaPtocasius urbanii – Bhutan, ChinaPtocasius variegatus Logunov, 1995 – KazakhstanPtocasius versicolor – BhutanPtocasius vittatus Song, 1991 – ChinaPtocasius wangdicus – BhutanPtocasius weyersi Simon, 1885 – Vietnam, Indonesia Ptocasius wuermli – Bhutan, ChinaPtocasius zabkai Yang & Peng, 2023 – ChinaPtocasius zonatus Yang & Peng, 2023 – China