Matta nuusga, Brescovit & Cizauskas, 2019

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

publication ID

https://doi.org/ 10.11646/zootaxa.4559.3.1

publication LSID

lsid:zoobank.org:pub:10CDA291-A32F-4954-9B80-E33579AF46E3

DOI

https://doi.org/10.5281/zenodo.5934743

persistent identifier

https://treatment.plazi.org/id/038887C8-E774-FF92-FF0D-D4B5FBD21B8F

treatment provided by

Plazi

scientific name

Matta nuusga
status

sp. nov.

Matta nuusga View in CoL sp. n.

Figures 22 View 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 180289 View Materials ) ; Pains, Cave no name, 2013, A.P. Bueno et al. col., 1♀ ( IBSP 196135 View Materials ) ; Cave no name, no date, R. Zampaulo col., 1♀ ( IBSP 186402 View Materials ) ; Cave no name 2013, A. P. Bueno et al. col., 1♂ 1♀ ( IBSP 196129 View Materials ) ; Cave (no data), R. Zampaulo col., 2♂ ( IBSP 186401 View Materials ) ; Cave AMG-025 (20°22'29''S; 45°37'7''W) 17-29/ VI /2013, A. P. Bueno et al. col., 1♀ ( IBSP 186536 View 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 186537 View Materials ) GoogleMaps ; Cave C6a, 4/XI/2005, M.E. Bichuette col., 1♀ ( IBSP 196168 View 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 196130 View 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 196136 View Materials ) GoogleMaps ; Cave Gruta 13, IV/2008, E. O. Machado & J.P.P. Barbosa col., 1♀ ( IBSP 186392 View 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 196169 View Materials ) GoogleMaps ; Cave Gruta do Angico (20°25'4''S; 45°40'42''W), 25/ VI /2009, R.A. Zampaulo col., 1♀ ( IBSP 196125 View Materials ) GoogleMaps ; Cave Gruta do Carlinhos (20°24'7''S; 45°40'22''W) 30/III/2013, M.P.A. Oliveira col., 1♀ ( IBSP 181830 View Materials ) GoogleMaps ; Cave Gruta G-26 (20°22'48''S; 45°37'16''W), 04/ VI /2011, 1♀ ( IBSP 186012 View 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 196170 View Materials ) GoogleMaps ; Cave ICPA _170, 2013, A.P. Bueno et al. col., 1♀ ( IBSP 196128 View Materials ) ; Cave ICPA _777 (20°21'59''S; 45°36'27''W), 18/III-6/IV/2013, 1♂ ( IBSP 196132 View Materials ) GoogleMaps ; Cave ICPA _794 (20°21'36''S; 45°36'37''W) 18/III-6/ IV/2 0 13, 1♂ ( IBSP 196133 View Materials ) GoogleMaps ; Cave ICPA _811 (20°21'40''S; 45°36'41''W) 18/ III-06/IV/2013, 1♀ ( IBSP 196137 View Materials ) GoogleMaps ; Cave ICPA _834, 2013, 1♂ 1♀ ( IBSP 196138 View Materials ) ; Cave ICPA _837 (20°22'46''S; 45°35'59''W) 01-06/IV/2013, 1♀ ( IBSP 196134 View Materials ) GoogleMaps ; Cave ICPA _838 (20°22'46''S; 45°35'59''W) 01-06/IV/2013, 2♂ 2♀ ( IBSP 196127 View Materials ) GoogleMaps ; Cave ICPA _841, 2013 1♂ ( IBSP 196126 View Materials ) ; Cave ICPA _841 (20°22'49''S; 45°35'60''W) 01-06/ IV/2013, 1♀ ( IBSP 196131 View Materials ) ; Cave ICPA-148 (20°22'22''S; 45°36'31''W) 18/II- 09/III/2 0 13, 1♀ ( IBSP 186511 View Materials ; SEM) GoogleMaps ; Cave ICPA-152 (20°22'18''S; 45°36'52''W) 29/VII-10/VIII/2013, 1♂ 1♀ ( IBSP 186539 View Materials ) GoogleMaps ; Cave ICPA-588 (20°22'7''S; 45°36'60''W) 14/I-02/II/2013, 1♀ ( IBSP 186534 View Materials ) ; 1♀ ( IBSP 186538 View Materials ) ; Cave ICPA-620 (20°22'41''S; 45°36'28''W) 29/I-08/II/2013, 1♂ ( IBSP 186520 View Materials ; SEM) GoogleMaps ; Cave ICPA-675 (20°22'28''S; 45°36'30''W) 18/II-09/III/ 2013, 1♂ ( IBSP 186512 View Materials ; SEM) GoogleMaps ; Cave ICPA-692 (20°22'9''S; 45°36'15''W) 18/II-09/III/2013, 1♂ ( IBSP 186513 View 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 184306 View Materials ); Cave IM _025 (20°18'6''S; 45°47'26''W), 23/IV/2013, M.T.M. Souza col., 1♀ ( IBSP 186391 View Materials ); Cave SM _163 (20°22'26''S; 45°35'13''W), 13/II/2014, Equipe Spelayon col., 1♀ ( IBSP 186389 View Materials ); Cave SM _216 (20°21'45''S; 45°35'36''W), 12/II/2014, Equipe Spelayon col., 1♂ ( IBSP 186386 View Materials ); Cave SM _246 (20°21'51''S; 45°35'46''W), 20/ II/2014, Equipe Spelayon col., 1♂ ( IBSP 186387 View Materials ); Cave SM _257 (20°21'52''S; 45°35'44''W), 20/II/2014, Equipe Spelayon col., 1♂ 1♀ ( IBSP 186385 View Materials ; photo); Cave SM _261 (20°22'21''S; 45°35'14''W), 20/II/2014, Equipe Spelayon col., 1♂ ( IBSP 186384 View Materials ); Cave SM _290 (20°22'2''S; 45°35'20''W), 20/II/2014, Equipe Spelayon col., 1♂ ( IBSP 186383 View 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 186375 View Materials ); MIC _091 (20°25'59''S; 45°37'10''W) 9-15/VI /2015 GoogleMaps , Equipe Spelayon et al col., 1♀ ( IBSP 196164 View 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 186416 View 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 186508 View Materials ) 1♂ 1♀ ( IBSP 186509 View Materials ) 2♀ ( IBSP 186510 View 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, C View FIGURE 23 ) in both sexes, the laminar projection, with enlarged base forming a side flap ( Figs 22C View FIGURE 22 , 24C View FIGURE 24 ̄E) in the male palp and diamond piriform dorsal fold of the uterus externus in females ( Fig. 22F View FIGURE 22 ).

Description. Male (holotype, IBSP 186406). Carapace, chelicerae, labium, endites, sternum and abdomen orange. Legs yellowish white ( Fig. 22A View FIGURE 22 ). Total length 1.25. Carapace projected, 0.53 long, 0.42 wide, with rugose surface laterally, dorsally almost smooth ( Fig. 23A View FIGURE 23 ). Sternal surface tenuously reticulate. Clypeus long, oblique, seven times the length of ocular area ( Fig. 23A View FIGURE 23 ). Eye diameters and interdistances: AME vestigial, contiguous ( Fig. 23A, C View FIGURE 23 ). Cheliceral apophysis robust, large and occupying almost the frontal area, with great number of long hairs and translucent median lamina ( Fig. 23A, C View 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. 23E View FIGURE 23 ̄F), leg I with a strong spine on an elevated base ( Fig. 23E View FIGURE 23 ̄F). Abdomen ovoid, large sclerotized plate covering dorsal surface ( Fig. 22A View 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. 24F View 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 22B View FIGURE 22 ̄C, 24ĀE).

Female (Paratype, IBSP 186406). Coloration pattern as in male ( Fig. 22D View 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. 25B View 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. 25D View FIGURE 25 ̄E). Vulvae externally with large V-shaped receptacle, visible by transparency ( Fig. 22E View FIGURE 22 ); Ʌ-shaped post genital plate and enlarged copulatory opening ( Fig. 25F View 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. 22F View 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. 30C View FIGURE 30 ).

VI

Mykotektet, National Veterinary Institute

IM

Indian Museum

SM

Sarawak Museum

MIC

Mar Ivanios College (Zoology museum)

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Tetrablemmidae

Genus

Matta

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