Matta nuusga,

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: 431-432

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Matta nuusga

sp. n.

Matta nuusga  sp. n.

Figures 22View FIGURE 22 ̄25, 30C.

Types. Male holotype and female paratype from Pains, Minas Gerais, Brazil, R. Zampaulo col., deposited in IBSP 186406.

Other material examined. BRAZIL. Minas Gerais: Matozinhos, Cave MOC-N5, 01-08/VIII/2011, F.P. Franco & C.A.R. Souza et al. col., 1♀ ( IBSP 180289View Materials)  ; Pains, Cave no name, 2013, A.P. Bueno et al. col., 1♀ ( IBSP 196135View Materials)  ; Cave no name, no date, R. Zampaulo col., 1♀ ( IBSP 186402View Materials)  ; Cave no name 2013, A. P. Bueno et al. col., 1♂ 1♀ ( IBSP 196129View Materials)  ; Cave (no data), R. Zampaulo col., 2♂ ( IBSP 186401View Materials)  ; Cave AMG-025 (20°22'29''S; 45°37'7''W) 17-29/ VI /2013, A. P. Bueno et al. col., 1♀ ( IBSP 186536View Materials)GoogleMaps  ; Cave AMG-05 (20°22'4''S; 45°37'0''W), 14/I-02/II/2013, A.P. Bueno et al. col., 2♂ ( IBSP 186537View Materials)GoogleMaps  ; Cave C6a, 4/XI/2005, M.E. Bichuette col., 1♀ ( IBSP 196168View Materials)  ; Cave GE_32 (20°21'42''S; 45°36'26''W) 18/III-6/IV/2013, A.P. Bueno et al. col., 1♂ ( IBSP 196130View Materials)GoogleMaps  ; Cave GE_34 (20°22'6''S; 45°36'14''W), 15-27/VII/2013, A.P. Bueno et al. col., 2♀ ( IBSP 196136View Materials)GoogleMaps  ; Cave Gruta 13, IV/2008, E. O. Machado & J.P.P. Barbosa col., 1♀ ( IBSP 186392View Materials)  ; Cave Gruta Arcaica (20°17'11''S; 45°47'34''W), 25/I/2008, E. O. Machado & J.P.P. Barbosa col., 1♂ ( IBSP 196169View Materials)GoogleMaps  ; Cave Gruta do Angico (20°25'4''S; 45°40'42''W), 25/ VI /2009, R.A. Zampaulo col., 1♀ ( IBSP 196125View Materials)GoogleMaps  ; Cave Gruta do Carlinhos (20°24'7''S; 45°40'22''W) 30/III/2013, M.P.A. Oliveira col., 1♀ ( IBSP 181830View Materials)GoogleMaps  ; Cave Gruta G-26 (20°22'48''S; 45°37'16''W), 04/ VI /2011, 1♀ ( IBSP 186012View Materials)GoogleMaps  ; Cave Gruta Trincheira do Vietnã (20°17'9''S; 45°47'35''W), 25/I/2008, E. O. Machado & J.P.P. Barbosa col., 1♂ ( IBSP 196170View Materials)GoogleMaps  ; Cave ICPA _170, 2013, A.P. Bueno et al. col., 1♀ ( IBSP 196128View Materials)  ; Cave ICPA _777 (20°21'59''S; 45°36'27''W), 18/III-6/IV/2013, 1♂ ( IBSP 196132View Materials)GoogleMaps  ; Cave ICPA _794 (20°21'36''S; 45°36'37''W) 18/III-6/ IV/2 0 13, 1♂ ( IBSP 196133View Materials)GoogleMaps  ; Cave ICPA _811 (20°21'40''S; 45°36'41''W) 18/ III-06/IV/2013, 1♀ ( IBSP 196137View Materials)GoogleMaps  ; Cave ICPA _834, 2013, 1♂ 1♀ ( IBSP 196138View Materials)  ; Cave ICPA _837 (20°22'46''S; 45°35'59''W) 01-06/IV/2013, 1♀ ( IBSP 196134View Materials)GoogleMaps  ; Cave ICPA _838 (20°22'46''S; 45°35'59''W) 01-06/IV/2013, 2♂ 2♀ ( IBSP 196127View Materials)GoogleMaps  ; Cave ICPA _841, 2013 1♂ ( IBSP 196126View Materials)  ; Cave ICPA _841 (20°22'49''S; 45°35'60''W) 01-06/ IV/2013, 1♀ ( IBSP 196131View Materials)  ; Cave ICPA-148 (20°22'22''S; 45°36'31''W) 18/II- 09/III/2 0 13, 1♀ ( IBSP 186511View Materials; SEM)GoogleMaps  ; Cave ICPA-152 (20°22'18''S; 45°36'52''W) 29/VII-10/VIII/2013, 1♂ 1♀ ( IBSP 186539View Materials)GoogleMaps  ; Cave ICPA-588 (20°22'7''S; 45°36'60''W) 14/I-02/II/2013, 1♀ ( IBSP 186534View Materials)  ; 1♀ ( IBSP 186538View Materials)  ; Cave ICPA-620 (20°22'41''S; 45°36'28''W) 29/I-08/II/2013, 1♂ ( IBSP 186520View Materials; SEM)GoogleMaps  ; Cave ICPA-675 (20°22'28''S; 45°36'30''W) 18/II-09/III/ 2013, 1♂ ( IBSP 186512View Materials; SEM)GoogleMaps  ; Cave ICPA-692 (20°22'9''S; 45°36'15''W) 18/II-09/III/2013, 1♂ ( IBSP 186513View Materials)GoogleMaps  , all collected by A. P. Bueno et al. col., Cave IM _002 (20°18'8''S; 45°47'40''W), 15/V/2013, M.T.M. Souza col., 1♂GoogleMaps 

(IBSP 186390); Cave IM _011 (20°18'10''S; 45°47'33''W), 06/XI/2013, M. Barcelos et al., 1♀ ( IBSP 184306View Materials); Cave IM  _025 (20°18'6''S; 45°47'26''W), 23/IV/2013, M.T.M. Souza col., 1♀ ( IBSP 186391View Materials); Cave SM  _163 (20°22'26''S; 45°35'13''W), 13/II/2014, Equipe Spelayon col., 1♀ ( IBSP 186389View Materials); Cave SM  _216 (20°21'45''S; 45°35'36''W), 12/II/2014, Equipe Spelayon col., 1♂ ( IBSP 186386View Materials); Cave SM  _246 (20°21'51''S; 45°35'46''W), 20/ II/2014, Equipe Spelayon col., 1♂ ( IBSP 186387View Materials); Cave SM  _257 (20°21'52''S; 45°35'44''W), 20/II/2014, Equipe Spelayon col., 1♂ 1♀ ( IBSP 186385View Materials; photo); Cave SM  _261 (20°22'21''S; 45°35'14''W), 20/II/2014, Equipe Spelayon col., 1♂ ( IBSP 186384View Materials); Cave SM  _290 (20°22'2''S; 45°35'20''W), 20/II/2014, Equipe Spelayon col., 1♂ ( IBSP 186383View Materials); Cave SPA_012/013 (20°17'58''S; 45°37'4''W)GoogleMaps  , 27/VIII/2 0 13, F. O. Borges col., 1♀ ( IBSP 186375View Materials); MIC  _091 (20°25'59''S; 45°37'10''W) 9-15/ VI /2015GoogleMaps  , Equipe Spelayon et al col., 1♀ ( IBSP 196164View Materials); Piunhi, Cave ICCA-571 (20°20'45''S; 45°50'52''W), 13-21/I/2014, A.P. Bueno et al. col., 1♀ ( IBSP 186416View Materials); Santa Bárbara, Cave GAND  _0033 (20°05'23''S; 43°39'9''W), 10/II- 20/III/2 0 14, Equipe Carste col., 1♀ ( IBSP 186508View Materials)  1♂ 1♀ ( IBSP 186509View Materials)  2♀ ( IBSP 186510View Materials)  .

Etymology. The specific name is a noun in apposition that refers to an expression used by people in the Brazilian State of Minas Gerais meaning “astonishment”, due to the unusual grouped eye arrangement and internal morphology of the female genitalia.

Diagnosis. Matta nuusga  is distinguished from other Matta  species by having a combination of anterior medial eyes together on a common base ( Fig. 23A, CView FIGURE 23) in both sexes, the laminar projection, with enlarged base forming a side flap ( Figs 22CView FIGURE 22, 24CView FIGURE 24 ̄E) in the male palp and diamond piriform dorsal fold of the uterus externus in females ( Fig. 22FView FIGURE 22).

Description. Male (holotype, IBSP 186406). Carapace, chelicerae, labium, endites, sternum and abdomen orange. Legs yellowish white ( Fig. 22AView FIGURE 22). Total length 1.25. Carapace projected, 0.53 long, 0.42 wide, with rugose surface laterally, dorsally almost smooth ( Fig. 23AView FIGURE 23). Sternal surface tenuously reticulate. Clypeus long, oblique, seven times the length of ocular area ( Fig. 23AView FIGURE 23). Eye diameters and interdistances: AME vestigial, contiguous ( Fig. 23A, CView FIGURE 23). Cheliceral apophysis robust, large and occupying almost the frontal area, with great number of long hairs and translucent median lamina ( Fig. 23A, CView FIGURE 23). Leg measurements: I—femur 0.36/ patella 0.13/ tibia 0.31/ metatarsus 0.2/ tarsus 0.23/ total 1.23; II—0.37/ 0.15/ 0.26/ 0.22/ 0.21/ 1.21; III—0.33/ 0.11/ 0.23/ 0.21/ 0.18/ 1.06; IV—0.41/ 0.13/ 0.36/ 0.25/ 0.28/ 1.43. Leg formula 4123. Leg spination: absent, metatarsus narrowed at base ( Fig. 23EView FIGURE 23 ̄F), leg I with a strong spine on an elevated base ( Fig. 23EView FIGURE 23 ̄F). Abdomen ovoid, large sclerotized plate covering dorsal surface ( Fig. 22AView FIGURE 22); 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 half-moon 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 with femur projected medially, with three long setae and small number of projected, salient and globose thin plates ( Fig. 24FView FIGURE 24); tibia strongly swollen, oval, rounded posteriorly; cymbium small; bulbus pearshaped, with short and poor elevated conductor, involving partially the base of the embolus long, flattened, lightly sinuous, and very enlarged at apex, with short and acute basal laminar projection, with enlarged base forming a side flap ( Figs 22BView FIGURE 22 ̄C, 24ĀE).

Female (Paratype, IBSP 186406). Coloration pattern as in male ( Fig. 22DView FIGURE 22). Total length 1.23. Carapace as in male, 0.52 long, 0.4 wide. Clypeus and sternum as in male. Eyes as in male. Chelicerae with reduced apophysis, shorter than male, with ventral translucent hyaline keel ( Fig. 25BView FIGURE 25). Leg measurements: I—femur 0.42/ patella 0.13/ tibia 0.31/ metatarsus 0.21/ tarsus 0.25/ total 1.32; II—0.37/ 0.12/ 0.25/ 0.17/ 0.23/ 1.14; III—0.29/ 0.12/ 0.21/ 0.18/ 0.21/ 1.01; IV—0.43/ 0.14/ 0.39/ 0.28/ 0.23/ 1.47. Leg formula 4123. Leg spination as in male. Pedipalpal tarsus ending in acuminate, smooth pit.

Abdomen with plates as in male ( Fig. 25DView FIGURE 25 ̄E). Vulvae externally with large V-shaped receptacle, visible by transparency ( Fig. 22EView FIGURE 22); Ʌ-shaped post genital plate and enlarged copulatory opening ( Fig. 25FView FIGURE 25). Internally with enlarged receptaculum and narrow basal area of the copulatory ducts; central process 8-shaped, with one third of the length of the receptaculum ( Fig. 22FView FIGURE 22).

Natural history. All specimens of Matta nuusga  sp. n. were collected in limestone caves in the karst region of Arcos-Pains and surroundings. Individuals were located on the cave floor below rocks in aphotic zones of the caves. Based in the eye modification and long hairs of trichobothria we hypothesize that this species is a troglobite.

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


Mykotektet, National Veterinary Institute


Indian Museum


Sarawak Museum


Mar Ivanios College (Zoology museum)