Thiodina Simon, 1900

Thiodina Simon, 1900: 392 (type species by original designation: Attus elegans Nicolet, 1849 = Thiodina nicoleti Roewer, 1951); Simon 1901: 458 (redescription and key to related groups); Peckham & Peckham 1909; Wolff 1985; Richman & Vetter 2004; Nogueira 2003; Hill 2012.

Not Nilakantha Peckham & Peckham, 1901 (See below).

Not Colonus F. O.P.- Cambridge, 1901 (See below).

Note. With the species transferred to Cotinusa Simon and to the newly revalidated Colonus and Nilakantha (see below), Thiodina presently includes only its type species.

Relationships: Thiodina nicoleti resembles Arachnomura adfectuosa Galiano, 1977 and Cyllodania bicruciata Simon, 1902 for having spine-like setae on the anterior face of the proximal article of the chelicera (see Figs 4, 5, 9; Galiano 1977, figs 11, 14). It also resembles Titanattus pallidus Mello-Leitão, 1943 for the shape and markings on carapace (Figs 1, 4; Edwards et al. 2005, figs 1, 44, 45). Based on these characters and the depression on inner portion of chelicerae, this species appears to be related to genera presently considered as hyetussines (see Galiano 1966, 1976a, 1976b). A systematic review of this group, currently in progress (AAB & GRSR), can clarify the boundaries of genera and internal relationships of the group, allowing a better understanding of the position and composition of Thiodina .

Diagnosis. Among all already described members presently considered as hyetussines, Thiodina can be distinguished for including the only species with a strong pattern of dark/clear longitudinal stripes on the abdomen of both sexes (Figs 1, 8).