Neonella gyrinus sp. nov.

Figs 1–2

Type material. Holotype: ♂ from Parque Estadual do Cantão, 09°18'19.3"S, 49°57'28.1"W, Caseara, Tocantins, Brazil, 11 May 2016, A. Bonaldo et al. (MPEG 32806).

Etymology. The epithet is a Latin noun in apposition and means “tadpole”, in reference to the shape of the embolus and embolic disc in ventral view.

Diagnosis. Among all species of Neonella, N. gyrinus sp. nov. is similar to N. acostae Rubio, Argañaraz & Gleiser, 2015, N. camillae Edwards, 2003, N. noronha Ruiz, Brescovit & Freitas, 2007 and N. salafraria Ruiz & Brescovit, 2004 in having a long and coiled embolus emerging from the retrolateral side of the embolic disc (Figs 2B–C; see also Rubio et al. 2015: figs 4A–D). The embolus in N. salafraria (see Ruiz & Brescovit, 2004: figs 2–3) and N. noronha (see Ruiz et al. 2007: figs 12–13) is longer, with part of coil projecting over the retrolateral side of tegulum, while in N. acostae (see Rubio et al. 2015: figs 2B–C), N. camillae (see Edwards 2003: fig. 5) and N. gyrinus sp. nov. (Figs 2B–C), the coiled embolus is shorter and projected only along the distal portion of cymbium. However, N. gyrinus sp. nov. differs from these two species by having a single stout RPA with a rounded tooth on the ventral border (Figs 2B, 2D, 2F), while in N. acostae the RPA is pointed (see Rubio et al. 2015: figs 2B–C) and in N. camillae there are three patellar apophyses, one longer and spatulate and two short and triangular (see Edwards 2003: fig. 6).

Description. Male holotype (MPEG 32806). Total length: 1.30. Carapace 0.72 long, 0.54 wide and 0.36 high. Ocular quadrangle 0.31 long. Anterior eye row 0.56 wide, posterior 0.54 wide. Cheliceral teeth inconspicuous. Palp (Figs 2A–F): femur with prolateral ventral depression (Fig. 2A); patella and tibia short, about same length; cymbium oval and elongate (Fig. 2D); tegulum with lobe prolaterally curved (Fig. 2C) and slightly curved PSPL (Fig. 2E); embolic disc simple, with no conspicuous modification (Figs 2A–C); embolus coils half circle (counterclockwise in left palp, Fig. 2C). Legs: unknown (both II, IV lost). Length of leg: I 0.75 (0.23 + 0.39 + 0.13); III 1.21 (0.41 + 0.43 + 0.37). Color in alcohol: cephalic area black; thoracic area dark brown with a yellow longitudinal median stripe and yellow lateral sides, black borders; opisthosoma dorsally pale with two longitudinal dark brown stripes, which connect distally; laterally variegated with dark brown; ventrally pale, light brown distally; legs light brown, with black spots on femora and distally on patellae (Figs 1A–C).

Female. Unknown.

Distribution. Known only from the type locality (state of Tocantins, Brazil).

Natural History. The holotype was collected from the ground in an area of Cerrado, a drier biome, using a pitfall trap.