Matta teteia,

Brescovit, Antonio D. & Cizauskas, Igor, 2019, Seven new species of the spider genus Matta Crosby from caves in the State of Minas Gerais, Brazil (Araneae, Tetrablemmidae), Zootaxa 4559 (3), pp. 401-444: 437

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Matta teteia

sp. n.

Matta teteia  sp. n.

Figures 26View FIGURE 26 ̄29, 30B.

Types. Male holotype and female paratype from Gruta do Janelão (44°14'30''W 15°6'58''S), Parque Nacional Cavernas do Peruaçu, Januária, Minas Gerais, Brazil, 22/VII2012, M.E. Bichuette, J.E. Gallão & P.P. Rizzato col., deposited in IBSP 183764.

Other material examined. Brazil, Minas Gerais: Januária, Parque Nacional Cavernas do Peruaçu, Gruta do Janelão (44°14'30''W 15°6'58''S), 22/VII2012, M.E. Bichuette, J.E. Gallão & P.P. Rizzato col., 1♀ ( IBSP 183765View Materials; MEV)GoogleMaps  ; Gruta do Janelão (44°14'30''W 15°6'58''S), 22/VII2012, M.E. Bichuette, J.E. Gallão & P.P. Rizzato col., 1♂ ( IBSP 196165View Materials; MEV)GoogleMaps  .

Etymology. The specific name “tetéia” is a noun in apposition that refers to an expression used by people in the Brazilian State of Minas Gerais meaning beautiful thing, since this is one of the most beautiful species from the valley of the Peruaçu River.

Diagnosis. Matta teteia  is distinguished from other Matta  species by having a combination of anterior medial eyes together on a common base ( Figs 27A, EView FIGURE 27, 29A, CView FIGURE 29) in both sexes, the laminar projection short, triangular and convex ( Figs 26BView FIGURE 26 ̄C, 28ĀH) in the male palp and oval, with sclerotized base of the dorsal fold of the uterus externus in females ( Fig. 26FView FIGURE 26).

Description. Male (holotype, IBSP 183764). Carapace, chelicerae, labium, endites, and abdomen orange. Sternum yellow with orange borders. Legs yellow ( Fig. 26AView FIGURE 26). Total length 1.11. Carapace elevated, 0.46 long, 0.38 wide, with rugose surface laterally, dorsally almost smooth ( Fig. 27A, CView FIGURE 27). Sternal surface tenuously reticulate. Clypeus long, oblique, seven times the length of ocular area ( Fig. 27CView FIGURE 27). Anterior eyes vestigial, contiguous ( Fig. 27AView FIGURE 27 ̄E). Cheliceral apophysis conical, short, with long hairs and translucent median lamina (Fig. ĀD). Leg measurements: I—femur 0.38/ patella 0.14/ tibia 0.3/ metatarsus 0.23/ tarsus 0.25/ total 1.3; II—0.31/ 0.11/ 0.22/ 0.17/ 0.23/ 1.04; III—0.3/ 0.1/ 0.27/ 0.18/ 0.22/ 1.01; IV—0.41/ 0.13/ 0.38/ 0.19/ 0.26/ 1.37. Leg formula 4123. Leg spination: absent, metatarsus narrowed at base ( Fig. 27GView FIGURE 27 ̄H), leg I with a strong spine on an elevated base ( Fig. 27GView FIGURE 27 ̄H).

Abdomen ovoid, large sclerotized plate covering dorsal surface ( Fig. 26AView FIGURE 26); ventrally covered by four sclerotized plates. Abdominal plates: large pulmonary plate with rounded anterior margin, surrounding pedicel and bearing oval book-lung plates, followed posteriorly by very narrow postgenital plate, rectangular preanal plate, and conical anal plate surrounding spinnerets, laterally with four pairs of narrow plates, most ventral pair very short than others, and a line of the four epiandrous spigots. Male palp: femur with three long setae, medially elevated, with 3-4 small projected plates; tibia strongly swollen, rounded posteriorly ( Fig. 27FView FIGURE 27); cymbium small; bulbus pear-shaped, with conductor not involving the base of the sinuous embolus, flattened and having ɯ-shaped basal projection in the distal third and relatively short basal laminar projection, with apophysis at base ( Figs 26BView FIGURE 26 ̄C, 28ĀH).

Female (IBSP 183764). Coloration pattern as in male ( Fig. 26DView FIGURE 26). Total length 1.14. Carapace as in male, 0.46 long, 0.36 wide. Clypeus, sternum and eyes as in male ( Fig. 29BView FIGURE 29 ̄C). Chelicerae with inconspicuous apophysis, with ventral translucent hyaline keel, as in male ( Fig. 29AView FIGURE 29). Leg measurements: I—femur 0.47/ patella 0.12/ tibia 0.26/ metatarsus 0.18/ tarsus 0.22/ total 1.25; II—0.36/ 0.1/ 0.22/ 0.19/ 0.2/ 1.07; III—0.28/ 0.11/ 0.2/ 0.16/ 0.2/ 0.95; IV—0.42/ 0.11/ 0.34/ 0.22/ 0.26/ 1.35. Leg formula 4123. Leg spination absent. Pedipalpal tarsus ending in acuminate, smooth pit ( Fig. 29DView FIGURE 29).

Abdomen with plates as in male ( Fig. 29EView FIGURE 29). Vulvae externally with large V-shaped receptacle, visible by transparency ( Fig. 26EView FIGURE 26); enlarged at middle post genital plate and wide copulatory opening ( Fig. 29FView FIGURE 29). Internally with small distal area of the receptaculum and slender basal area of the copulatory ducts; central process oval at apex, with half-length of the receptaculum ( Fig. 26FView FIGURE 26).

Natural history. Matta teteia  sp. n. was collected in Janelão cave in the Peruaçu River Valley. It is a large tourist cave with carbonate rocks in the formation of Sete Lagoas (Grupo Bambuí). Based on its reduced and grouped eyes and long hairs of tricobothria we hypothesize that this species is a troglobite.

Distribution. Known only from Gruta do Janelão in the State of Minas Gerais, Brazil ( Fig. 30BView FIGURE 30).