Masteria guyanensis, Almeida & Salvatierra & Morais, 2018

Almeida, Marlus Queiroz, Salvatierra, Lidianne & Morais, José Wellington De, 2018, A new species of Masteria L. Koch, 1873 (Dipluridae: Masteriinae) from Guyana, Zootaxa 4434 (2), pp. 366-368 : 366-368

Masteria guyanensis new species ( Figures 1 −7)

Type material: Holotype male ( MCZ 65865), GUYANA: Potaro-Siparuni Region, 03-IX-2014 (M. G. Branstetter).

Material examined: BRAZIL, Amazonas: Manaus, Fazenda Experimental da UFAM, Masteria manauara Bertani, Cruz & Oliveira 2013 , holotype male, ( INPA 8598 ) ; 1♀ paratype (INPA 8600); 1♂ paratype (INPA 8606), Wanessa Cruz leg. Brazil, Amazonas: Manaus, Reserva Ducke, M. manauara , 1♂, 20.x.2006 ( INPA-AR 6291 ) ; 1♂, 20.x.2006 (INPA- AR 6292); 1♂, 20.x.2006 (INPA-AR 6293); 1♂, 20.x.2006 (INPA-AR 6294), J.L. Souza leg.; 1♂, 10.iii.2017 (INPA-AR 6295); 1♂, 28.iv.2017 (INPA-AR 6296); 1♂, 05.viii.2017 (INPA-AR 6297); 1♂, 4♀, 04.i. 2018 (INPA-AR 6298), all collected in pitfall, M.Q. Almeida leg.

Etymology. The specific name refers to its occurrence in Guyana.

Diagnosis. Masteria guyanensis new species is similar to Masteria manauara by having six eyes ( Figs. 1 ─3), paraembolic apophysis absent ( Figs. 4 ─6), and two subdistal ventral spurs curved inwards ( Figs. 1 ─7), but differ by having a shorter embolus ( Figs. 4 ─6), lacking spurs on metatarsus I, palp with 4 apical spines on cymbium, longer palp femur and sternum (Figures 2, 4, 6).

Description. Male Holotype (MCZ 65865). Carapace 1.1 long, 1.0 wide, entirely pale yellow with darker lateral margins ( Fig. 1 ); with long bristles. Fovea short, procurved. Six eyes on a tubercle (Fig. 3). Eye group 0.19 long, 0.20 wide. Size and interdistances: ALE 0.10, PME 0.05, PLE 0.09, ALE-ALE 0.03, ALE-PLE 0.006, PME-PLE 0.02 PME- PME 0.02, ALE-PME 0.009. MOQ front width 0.08, back width 0.18, length 0.09. Chelicerae small, 0.23 long, 0.18 wide, with 10 promarginal teeth. Labium 0.21 long, 0.13 wide. Maxillae 0.32 long, 0.25 wide, cuspules absent. Sternum 0.80 long, 0.58 wide, sigilla not evident. Bulb globose. Tegulum 0.18 long, 0.11 wide. Embolus short, 0.06 long, 0.006 wide. Leg formula 4132. Leg lengths and midwidths in Table 1. Tibia I with two subdistal prolateral spurs. Spines elongated: leg I, femur v3, d2; leg II, femur v3, d3, p2; patella, v2, d1, r, tibia v1, d4, metatarsus v3, d1; leg III, femur v4, d5, patella d2, tibia v2, d1, metatarsus v1, d1, p1; leg IV, femur v3, d2, patella v1, d2, tibia v3, d3, metatarsus v3; palp, tarsus 4. Abdomen 1.01 long, 0.68 wide. Spinnerets (Fig. 2): PMS not evident. PLS 0.56 long, 0.05 wide, basal, middle and apical segments, 0.37 long, 0.06 wide, 0.32 long, 0.09 wide, respectively.

Female. Unknown.

Distribution. Known only from the type locality (Potaro-Siparuni Region, Guyana).

Figures

FIGURES 1─3. Masteria guyanensis sp. nov. (♂ MCZ 65865). (1) habitus dorsal (arrows indicates spurs); (2) habitus ventral; (3) eyes tubercle. Scale bars: 1─2 = 0.5 mm; 3 = 0.1 mm.

FIGURES 4─7. Masteria guyanensis sp. nov. (♂ MCZ 65865). (4) palp, prolateral view; (5) palp, ventral view (6) palp, ventral view; and (7) left leg I. Scale bars: 4─6= 0.3 mm; 7 = 0.2 mm.