Lygromma is a spider genus of Central and South America. There are species with eight, six (e.g. L. senoculatum, L. valencianum) and no eyes. The eyeless L. anops is endemic to the Galapagos, while the distantly related blind L. gertschi is found only on Jamaica.
The Mexican genera Tivodrassus and Tricongius have been suggested as sister groups of Lygromma.
Species can reach a body length from about 2 to 4.6 mm.
Species , the genus contains 19 species: Lygromma anops Peck & Shear, 1987 — Galapagos Islands Lygromma chamberlini Gertsch, 1941 — Panama, Colombia, Cuba Lygromma domingo Platnick & Shadab, 1981 — Ecuador Lygromma dybasi Platnick & Shadab, 1976 — Costa Rica, Panama Lygromma gasnieri Brescovit & Höfer, 1993 — Brazil Lygromma gertschi Platnick & Shadab, 1976 — Jamaica Lygromma huberti Platnick & Shadab, 1976 — Venezuela, Brazil Lygromma kochalkai Platnick & Shadab, 1976 — Colombia Lygromma nicolae Víquez, 2020 – Costa Rica Lygromma peckorum Platnick & Shadab, 1976 — Colombia Lygromma peruvianum Platnick & Shadab, 1976 — Peru Lygromma quindio Platnick & Shadab, 1976 — Colombia Lygromma senoculatum Simon, 1893 — Venezuela Lygromma simoni (Berland, 1913) — Ecuador Lygromma taruma Brescovit & Bonaldo, 1998 — Brazil Lygromma tuxtla Platnick, 1978 — Mexico Lygromma valencianum Simon, 1893 — Venezuela Lygromma volcan Platnick & Shadab, 1981 — Panama Lygromma wygodzinskyi Platnick, 1978 — Colombia
References
Platnick, N.I. & Shadab, M.U. (1976). A revision of the spider genera Lygromma and Neozimiris (Araneae, Gnaphosidae). Amer. Mus. Novitates 2598:1-23. PDF (8Mb) - Abstract (with key to species) Platnick, N.I. (1977). Two new species of Lygromma (Araneae: Gnaphosidae). J. Arachnol. 5:151-152. PDF (L. tuxtla, L. wygodzinskyi) Shear, W.A. & Peck, S.B. (1992). Male of the blind cave gnaphosoid Lygromma anops (Araneae, Gnaphosoidea, Prodidomidae) from Galapagos Islands, Ecuador. Journal of Arachnology 20:69-71. PDF