Belongs within: Theridiidae.
Phycosoma is a cosmopolitan genus of cobweb spiders with a high, almost cylindrical carapace in the males.
Characters (from Fitzgerald & Sirvid 2004): Male carapace often very high, near cylindrical when viewed from above, marked with dorsal grooves and depressions; female carapace, if high, is only so anteriorly. Eye region often projecting beyond clypeus; clypeus often slightly concave. Chelicerae very small, without teeth; fangs long and flat. Legs 4 1 2 3, with leg 4 slightly the longest. Female palpal claw simple. Abdomen often partially covered by dorsal scutum; colulus absent. Male palp lacking a median apophysis; conductor and embolus small. Female with two pairs of seminal receptacles; epigynal opening leading to pair of ducts connecting to posterior receptacles, with second pair of ducts connecting posterior to anterior receptacles. Epigynum with small scape.
<==Phycosoma Cambridge 1879 [incl. Trigonobothrys Simon 1889]FS04 |--*P. oecobioides Cambridge 1879FS04 |--P. alta (Keyserling 1886) [=Dipoena alta]FS04 |--P. amamiensis (Yoshida 1985)FS04 |--P. excisum (Simon 1889) [=*Trigonobothrys excisus]FS04 |--P. flavomarginatum (Bösenberg & Strand 1906)FS04 |--P. inornata (Cambridge 1861) [=Theridion inornatum, Dipoena inornata]FS04 |--P. jamesi (Roberts 1979) [=Dipoena jamesi]FS04 |--P. japonicum (Yoshida 1985)FS04 |--P. lineatipes (Bryant 1933) [=Dipoena lineatipes]FS04 |--P. martinae (Roberts 1983)FS04 |--P. menustya (Roberts 1979) [=Dipoena menustya]FS04 |--P. mustelinum (Simon 1889)FS04 `--P. nigromaculatum (Yoshida 1987)FS04
*Type species of generic name indicated
References
[FS04] Fitzgerald, B. M., & P. J. Sirvid. 2004. Notes on the genus Phycosoma Cambridge, 1879, senior synonym of Trigonobothrys Simon, 1889 (Theridiidae: Araneae). Tuhinga 15: 7–12.