Tonton itabirito, Passanha, Victor, Cizauskas, Igor & Brescovit, Antonio D., 2019

Passanha, Victor, Cizauskas, Igor & Brescovit, Antonio D., 2019, A new genus of Micromygalinae (Araneae, Microstigmatidae) from Brazil, with transfer of Masteriaemboaba Pedroso, Baptista & Bertani, 2015 and description of six new species, ZooKeys 814, pp. 1-32 : 4-7

Tonton itabirito sp. n. Figures 3, 4, 13

Types.

Holotype male and paratype female from Itabirito (20°14'30.0"S, 43°48'51.1"W), Minas Gerais, no data, Marcus leg., deposited in IBSP196178 and IBSP196179.

Other material examined.

BRAZIL. Minas Gerais: Barão de Cocais, Cave RF-083 (19°57'23"S, 43°35'15"W), Am. 28, 6♀, 10-21.III.2009, R. Andrade et al. leg. (IBSP 196176); Itabirito, Cave CPTM_14 (20°7'1"S, 43°53'56"W), Am. 22, 1♂ 2♀ 2 imm., 09.I.2013, M.P.A. de Oliveira leg. (IBSP 196177); Cave CPTM_15 (20°7'1"S, 43°53'55"W), Am. 12, 1♀ 5 imm., 09.I.2013, M.P.A. de Oliveira leg. (IBSP 196187); Cave CPTM_08 (20°7'25"S, 43°54'5"W), Am. 36, 2♀, 14.I.2013, M.P.A. de Oliveira leg. (IBSP 196188); Rio Acima, Cave VG-29 (20°7'5"S, 43°53'40"W), Am. 262, 1♀, 29. III– 01.IV.2011, R. Andrade & I. Cizauskas et al. leg. (IBSP 196180); Cave VG-27 (20°7'0"S, 43°53'53"W), Am. 88, 1♀, 29. III– 01.IV.2011, R. Andrade & I. Cizauskas et al. leg. (IBSP 196181); Cave VG-20, (20°7'23"S, 43°54'3"W), Am. 53, 2♀, 29. III– 01.IV.2011, R. Andrade & I. Cizauskas et al. leg. (IBSP 196182); Cave VG-27 (20°7'0"S, 43°53'53"W), Am. 250, 1♀, 2-10.VIII.2011, R. Andrade & I. Cizauskas et al. leg. (IBSP 196183); Cave VG-27 (20°7'0"S, 43°53'53"W), Am. 249, 1♀, 2-10.VIII.2011, R. Andrade & I. Cizauskas et al. leg. (IBSP 196184); Cave VG-27 (20°7'0"S, 43°53'53"W), Am. 247, 1♀, 2-10.VIII.2011, R. Andrade & I. Cizauskas et al. (IBSP 196185); Cave VG-26 (20°7'0"S, 43°53'54"W), Am. 232, 2♀, 2-10.VIII.2011, R. Andrade & I. Cizauskas et al. leg. (IBSP 196186); Cave VG-01 (20°9'9"S, 43°49'0"W), 1♂, 2-10.VIII.2011, I. Cizauskas leg. (IBSP 198496; MEV); Cave VG-01 (20°9'9"S, 43°49'0"W), Am. 01, 1♀, 29. III– 01.V.2011 (IBSP 196197); Cave VG-01 (20°9'9"S, 43°49'0"W), Am. 02, 4♀, 29. III– 01.V.2011 (IBSP 196199); Cave VG-01 (20°9'9"S, 43°49'0"W), Am. 153, 1♀, 29. III– 01.V.2011 (IBSP 196200), all collected by R. Andrade & I. Cizauskas et al.

Etymology.

The specific epithet is a noun taken in apposition and refers to the type locality.

Diagnosis.

Males of Tonton itabirito sp. n. resemble the males of the other species in the genus by the piriform bulb, but differ by the absence of eyes (Fig. 3A). Females are similar to T. quiteria sp. n. by the spermathecae with the thickened internal lobe (Fig. 11E), but differ by the uniform apex (Fig. 4 E–F).

Description.

Male (holotype). Coloration: carapace and legs whitish, abdomen yellowish. Eyes absence, strong ocular spot (Fig. 3A). Total length 1.98. Carapace 0.9 long, 0.68 wide. Abdomen 1.08 long. Fovea 0.12. Labium 0.13 long, 0.18 wide. Sternum 0.50 wide, 0.65 long. Serrula with three rows of teeth clumped in series (Fig. 3C). Palp: femur 0.53/ patella 0.23/ tibia 0.38/ tarsus 0.25/ total 1.39. Legs: I femur 0.76/ patella 0.34/ tibia 0.64/ metatarsus 0.42/ tarsus 0.34/ total 2.50; II 0.63/ 0.32/ 0.5/ 0.35/ 0.32/ 2.12; III 0.65/ 0.29/ 0.45/ 0.5/ 0.39/ 2.28; IV 0.82/ 0.33/ 0.62/ 0.64/ 0.46/ 2.87. Leg formula 4132. Spination: palp: tarsus d4ap; leg I patella v1, tibia v2-2ap, metatarsus v1-2ap; II patella v2, tibia v2-3ap, r1, metatarsus v2-3ap, p1; III patella v2, p1, r1, tibia d2-2ap, p2, r3, metatarsus d2, v3-3ap, p2, r2; IV patella p1, r1, tibia d2, v1-3ap, p2, r3, metatarsus d2, v3ap, p1, r1. Tibia I with two or three apical ventral spines. Palpal tibia two or three times the size of cymbium, with distal area of bulb resting in a ventral depression. Cymbium as long as wide with a short prolateral lobe (Fig. 3E), with four apical spines (Fig. 3B, E). Bulb piriform, embolus with the same size of tegulum, with discrete median sinuosity, apex of embolus slightly rounded (Fig. 3B, D–F). PLS: basal, medial and apical segments, 0.24, 0.18, 0.23 long.

Female (Paratype). Coloration as in male. Eyes and strong ocular spot as in male (Fig. 4A). Total length 2.03. Carapace 0.82 long, 0.58 wide. Abdomen 1.20 long. Fovea 0.12. Labium 0.05 long, 0.13 wide. Sternum 0.40 wide, 0.55 long. Serrula with four rows of teeth clumped in series (Fig. 4B). Palp: femur 0.46/ patella 0.24/ tibia 0.29/ tarsus 0.33/ total 1.32; leg I femur 0.65/ patella 0.3/ tibia 0.43/ metatarsus 0.34/ tarsus 0.27/ total 1.99; II 0.48/ 0.25/ 0.3/ 0.26/ 0.25/ 1.54; III 0.46/ 0.24/ 0.3/ 0.25/ 0.29/ 1.54; IV 0.58/ 0.26/ 0.43/ 0.41/ 0.37/ 2.05. Leg formula 4123. Spination: leg III tibia r1, metatarsus d2, p1, r1; IV tibia v2, p2, r2, metatarsus v2-2ap, p1, r1. Genitalia with two bilobed spermathecae, internal lobe thickened with rounded and uniform apex, external lobe short and wide, glands in both lobes, scattered irregularly and enlarged genitalia basis, (Fig. 4E, F). PLS: basal, medial and apical segments, 0.47, 0.63, 0.47 long.

Natural history.

Tonton itabirito sp. n. is the only anophthalmic troglobite species here described. The specimens were collected mainly in iron caves in the Quadrilátero Ferrífero Iron Region, in deep regions on the cave floor.

Distribution.

In the cities of the Rio Acima, Itabirito, Barão do Cocais, in the state of Minas Gerais (Fig. 13).