Matta cambito,

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: 422-427

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Matta cambito

sp. n.

Matta cambito  sp. n.

Figures 15View FIGURE 15 ̄18, 30A

Types. Male holotype from Cave SMS_150 (20°12'S; 43°51'W), 03/XII/2015, and female paratype from Cave MP_008 (20°12'38''S; 43°51'11''W), 08/IX/2005, Mina do Pico, Itabirito, Minas Gerais, Brazil, R.L. Ferreira col., deposited in IBSP 186400 and IBSP 186399, respectively.

Other material examined. Brazil. Minas Gerais: Itabirito, Mina do Pico, Cave MP _008 (20°12'38''S; 43°51'11''W), 08/IX/2005, R.L. Ferreira col., 2♂ 1♀ ( IBSP 196166View Materials, 1♂ 1♀ = SEM); Cave SMS_150 (20°12'S; 43°51'W), 03/XII/2015, R. L. Ferreira col., 1♀ ( IBSP 196167View Materials — ♀ = SEM); Matozinhos, Cave MOC-113 (19°33'16''S; 44°01'12''W), 04-15/IV/2011, F.P. Franco & C.A.R. Souza et al. col., 1♂ ( IBSP 186420View Materials)GoogleMaps  .

Etymology. The specific name is a noun in apposition that refers to an interjection used by people in the Brazilian State of Minas Gerais meaning “legs long and thin”, due to the slender form of this species.

Diagnosis. Matta cambito  is distinguished from other Matta  species by having a combination of slender body and long legs in males and females ( Fig. 15A, DView FIGURE 15), leg I of male with base of the three conspicuous setae in an elongated projection ( Fig. 17AView FIGURE 17 ̄B) and subtriangular dorsal fold of the uterus externus of females ( Fig. 15FView FIGURE 15).

Description. Male (holotype, IBSP 186400). Cephalothorax and abdomen yellow. Legs yellowish white ( Fig. 15AView FIGURE 15). Total length 1.34. Carapace projected, 0.52 long, 0.32 wide, with rugose surface, four times the diameter of the vestigial eyes ( Figs 15AView FIGURE 15, 16A, CView FIGURE 16). Sternal surface tenuously reticulate. Clypeus long, oblique ( Fig. 16CView FIGURE 16). Eye almost vestigial ( Fig. 16AView FIGURE 16 ̄C), diameters and interdistances: AME 0.04, AME-AME 0.08. Cheliceral apophysis short, conical, with long hairs and translucent median lamina ( Fig. 16AView FIGURE 16 ̄D). Leg measurements: I – femur 0.46/ patella 0.15/ tibia 0.43/ metatarsus 0.31/ tarsus 0.36/ total 1.71; II—0.45/ 0.15/ 0.42/ 0.3/ 0.35/ 1.67; III—0.38/ 0.15/ 0.33/ 0.28/ 0.32/ 1.46; IV—0.61/ 0.16/ 0.52/ 0.38/ 0.35/ 2.02. Leg formula 4123. Leg I, spination absent; metatarsus narrowed at base ( Fig. 17BView FIGURE 17). Abdomen ovoid, elongated, large sclerotized plate covering dorsal surface ( Fig. 15AView FIGURE 15); 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, with same length ( Fig. 16GView FIGURE 16), and a line of the four epiandrous spigots ( Fig. 16HView FIGURE 16). Male palp with femur with three long setae, median short and small number of projected salient plates ( Fig. 17HView FIGURE 17); tibia strongly swollen, almost oval, rounded posteriorly; cymbium small; bulbus pear-shaped, with conductor with short border, involving the base of the embolus long, poor sinuous, and sharp at apex, with acute and relatively short basal laminar projection ( Fig. 17CView FIGURE 17 ̄G).

Female (Paratype, IBSP 186399). Coloration pattern as in male, but darker ( Fig. 15DView FIGURE 15). Total length 1.34. Carapace as in male, 0.56 long, 0.44 wide. Eyes, clypeus and sternum as in male. Chelicerae without apophysis, with ventral translucent hyaline keel as in male ( Fig. 18AView FIGURE 18). Endites largeand serrula with 14-18 conical teeth ( Fig. 18CView FIGURE 18). Labium subtriangular and more than 8 elongated setae ( Fig. 18CView FIGURE 18). Leg measurements: I—femur 0.48/ patella 0.15/ tibia 0.47/ metatarsus 0.31/ tarsus 0.32/ total 1.73; II—0.45/ 0.14/ 0.41/ 0.3/ 0.34/ 1.64; III—0.35/ 0.11/ 0.34/ 0.32/ 0.3/ 1.42 IV—0.64/ 0.15/ 0.56/ 0.4/ 0.33/ 2.08. Leg formula 4123. Leg spination absent. Pedipalpal tarsus ending in acuminate, smooth pit ( Fig. 18BView FIGURE 18). Abdomen with plates as in male ( Fig. 18DView FIGURE 18 ̄E). Vulvae externally with ᴗ-shaped receptacle, visible by transparency ( Fig. 15EView FIGURE 15); narrow post genital plate and enlarged copulatory opening ( Fig. 18FView FIGURE 18). Internally with narrow receptaculum and copulatory ducts; central process narrow, with half-length of the receptaculum ( Fig. 15FView FIGURE 15).

Natural history. Matta cambito  sp.n. has reduced eyes, similar to those of other cave-adapted Matta  species. It is known only from caves in the Quadrilátero Ferrífero Iron Region and one cave in carbonate formation. We hypothesize that this species is a troglobite.

Distribution. Known from caves in the State of Minas Gerais, Brazil ( Fig. 30AView FIGURE 30).


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