Seven new species of the spider genus Matta Crosby from caves in the State of Minas Gerais, Brazil (Araneae, Tetrablemmidae) Brescovit, Antonio D. Cizauskas, Igor Zootaxa 2019 2019-02-21 4559 3 401 444 3YF6X Brescovit & Cizauskas, 2019 Brescovit & Cizauskas 2019 [151,332,367,393] Arachnida Tetrablemmidae Matta GBIF Animalia Araneae 10 411 Arthropoda species pititinha sp. nov.   Figures 6̄9, 30B.  Types.Male holotypefrom Cave HOL_014 ( 44°03'54"W, 21°10'58"S) and female paratypefrom Cave HOL_020 ( 44°03'59"W, 21°11'06"S), Prados, Minas Gerais, Brazil, 13-16/III/2017, Eq. Spelayon et al. col., deposited in IBSP 196139 and IBSP 196140, respectively.   Other material examined.  Brazil.  Minas Gerais: Prados, CaveHOL_017 ( 44°03'55"W, 21°11'04"S),  13-16/ III/2017, Eq. Spelayon et al. col., 1♂( IBSP 196141; photo);  CaveHOL_020 ( 44°03'59"W, 21°11'06"S),  13-16/III/ 2017, Eq. Spelayon et al. col., 1♀( IBSP 196142; photo);  CaveHOL_020 (7657089 596891),  19-26/IX/2017, 1♂ 1♀( IBSP 196145— SEM ♂ ♀);  CaveS3_HOL_004 ( 44°3'55''W 21°11'4''S),  22-30/VII/2014, 1♂( IBSP 186367);  CaveS3_HOL_003 ( 44°3'55''W 21°11'4''S),  22-30/VII/2014, 1♀( IBSP 186368);  CaveS3_HOL_002 ( 44°03'56"W, 21°11'04"S),  22-30/VII/2014, 1♀( IBSP 186369);  CaveS3_HOL_021 ( 44°3'53''W 21°11'1''S),  22- 30/VII/2014, 1♀( IBSP 186370);  CaveS2_HOL_008 ( 44°3'54''W 21°10'58''S),  22-30/VII/2014, 1♀( IBSP 186371);  CaveHOL_021 (  19-26/IX/2017), 1♂ 1♀( IBSP 196143);  CaveHOL_025 (7657253 597004),  19-26/IX/ 2017, 1♀( IBSP 196144);  CaveHOL_016 (7657150 597014),  19-26/IX/2017, 1♀( IBSP 196146), all collected by Eq. Spelayon; Conceição do Mato Dentro, Cave SERP_0135 ( 43°23'21''W 19°2'42''S),  04/XII/2013, M.T.M. Souzacol., 1♀( IBSP 186379);  Morro do Pilar, Cave SERP_0043 ( 43°15'49''W 19°11'0''S),  31/VIII/20 13, 1♀( IBSP 186380);  Cave SERP_0050 ( 43°23'20"W, 19°02'08"S), 2013, 1♀( IBSP 186381);  Cave SERP_0013 ( 43°20'34''W 19°5'55''S),  VII/2013, 1♀( IBSP 186382), all collected by L.G.S. Soarescol.; Santo Antônio do Rio Abaixo, Cave SERP_0032 ( 43°16'31''W 19°9'58''S),  06/VII/2013, L.G.S. Soarescol., 1♂( IBSP 186378).   Etymology.The specific name is a noun in apposition that refers to an interjection used by people who live in the Brazilian State of Minas Geraismeaning “very small”, being the smallest described species of this genus.   Diagnosis.  Matta pititinhais distinguished from other  Mattaspecies by having a combination of males with a retrolateral projection on leg I consisting of four conspicuous setae in large sockets ( Fig. 7ĒF) and an oval dorsal fold of the uterus externus in females ( Fig. 6F).   Description. Male( holotype, cave HOL_14, Barroso, Minas Gerais, Brazil). Cephalothorax and abdomen orange. Legs and palps yellow. Total length 0.96. Carapace projected, 0.42 long, 0.37 wide, with rugose surface ( Figs 6A, 7ĀD). Sternal surface reticulate ( Fig. 7D). Clypeus long, oblique, four times the diameter of the vestigial eyes ( Fig. 7D). Two vestigial frontal eyes ( Fig. 7A, D). Cheliceral apophysis short and rounded, with long hairs and translucent median lamina ( Fig. 7ĀD). Leg measurements: I—femur 0.26/ patella 0.11/ tibia 0.24/ metatarsus 0.13/ tarsus 0.22/ total 0.96; II—0.22/ 0.1/ 0.22/ 0.12/ 0.2/ 0.86; III—0.18/ 0.08/ 0.2/ 0.11/ 0.17/ 0.74; IV—0.36/ 0.11/ 0.31/ 0.19/ 0.21/ 1.18. Leg formula 4123. Leg I, spination absent; metatarsus narrowed at base ( Fig. 7E). Abdomenovoid, large sclerotized plate covering dorsal surface ( Figs. 6A, 8H); 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 narrow and suboval 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 ( Fig. 8H), and a line of the four epiandrous spigots.  Male palp:femur with three long setae, with median short and projected salient plates ( Fig. 8G); tibia strongly swollen, rounded posteriorly; cymbium small; bulbus pear-shaped, with conductor with elevated border in the retrolateral side, involving the base of the long and sinuous embolus, enlarged at apex, with acute and coiled basally laminar projection ( Figs 6B̄C, 8A–F).  Female( Paratype; HOL_020, Barroso, Minas Gerais, Brazil). Coloration pattern as in male, except legs orange ( Fig. 6D). Total length 1.11. Carapace as in male ( Fig. 9ĀB), 0.43 long, 0.37 wide. Clypeus and sternum as in male. Eyes as in male. Chelicerae as in male and with inconspicuous apophysis ( Fig. 9A, C). Endites and labium as in male. Leg measurements: I—femur 0.34/ patella 0.12/ tibia 0.26/ metatarsus 0.17/ tarsus 0.21/ total 1.1; II— 0.28/ 0.11/ 0.23/ 0.16/ 0.24/ 1.02; III—0.27/ 0.1/ 0.2/ 0.16/ 0.21/ 0.94; IV—0.38/ 0.11/ 0.33/ 0.21/ 0.28/ 1.31.   FIGURE 6.  Matta pititinha  sp. n., male IBSP 196141 ( A–C), female IBSP 196142 ( D–F) Ahabitus, dorsal view Bleft male palp, retrolateral view Csame, prolateral view Dhabitus, dorsal view Eabdomen, vulva, ventral view Fsame, dorsal view cleared. Scale bars: 0.5 mm (F).   FIGURE 7.  Matta pititinha  sp. n., male IBSP 196145 ( A–F), Acarapace, frontal view Bchelicerae, details, frontal view Csame, lateral view Dcarapace, lateral view Eleg I, retrolateral view Fsame, prolateral view.   FIGURE 8.  Matta pititinha  sp. n., male palp, IBSP 196145 ( A–F), Aprolateral view Bdetail, prolateral view Cretro-ventral view Ddetail, retro-ventral view Edetail, retrolateral view Fdetail, frontal view G tibiae, dorsal view H abdomen, lateral view.   FIGURE 9.  Matta pititinha  sp. n., male IBSP 196145 ( A–F), Acarapace, frontal view Bsame, lateral view Cchelicerae, frontal view Dpedipalp, distal area Eabdomen, lateral view Fvulva, ventral view. Leg formula 4123. Leg spination absent. Pedipalpal tarsus ending in acuminate, smooth pit ( Fig. 9D). Abdomenwith plates as in males ( Fig. 9E). Vulvae externally with ᴗ-shaped receptacle, visible by transparency ( Fig. 9F); narrow post genital plate and thin copulatory opening ( Fig. 6E). Internally with straight receptaculum and copulatory ducts; central process narrow, with half the length of the receptaculum ( Fig. 6F).  Natural history.  Matta pititinha sp. n.has morphological characteristics (ocular reduction/vestigial eyes) consistent with isolation to a subterranean environment, and we hypothesize that this species is a troglobite. Specimens were only found in the aphotic regions of caves among mixed lithological formations of iron and carbonate.   Distribution.Known from caves in the State of Minas Gerais, Brazil( Fig. 30B). 2234226667 2017-03-13 2017-03-16 2017-03-13 IBSP Eq. Spelayon Brazil -21.184444 Cave 21 -44.065277 Prados 10 411 IBSP 196141 1 1 Minas Gerais 2234226686 2017-03-13 2017-03-16 2017-03-13 IBSP Eq. Spelayon Brazil -21.185 Cave 21 -44.066387 10 411 IBSP 196142 1 1 Minas Gerais 2234226490 2017-09-19 2017-09-26 2017-09-19 SEM Brazil Cave 10 411 IBSP 196145 4 2 2 Minas Gerais 2234226603 [521,1432,690,715] 2014-07-22 2014-07-30 2014-07-22 IBSP Brazil -21.184444 Cave 21 -44.065277 10 411 IBSP 186367 1 1 Minas Gerais 2234226739 [151,1170,726,751] 2014-07-22 2014-07-30 2014-07-22 IBSP Brazil -21.184444 Cave 21 -44.065277 10 411 IBSP 186368 1 1 Minas Gerais 2234226547 2014-07-22 2014-07-30 2014-07-22 IBSP Brazil -21.184444 Cave 21 -44.065556 10 411 IBSP 186369 1 1 Minas Gerais 2234226704 2014-07-22 2014-07-30 2014-07-22 IBSP Brazil -21.18361 Cave 21 -44.06472 10 411 IBSP 186370 1 1 Minas Gerais 2234226738 2014-07-22 2014-07-30 2014-07-22 IBSP Brazil -21.182777 Cave 21 -44.065 10 411 IBSP 186371 1 1 Minas Gerais 2234226479 [260,904,834,859] 2017-09-19 2017-09-26 2017-09-19 IBSP Brazil Cave 10 411 IBSP 196143 2 1 1 Minas Gerais 2234226713 2017-09-19 2017-09-26 2017-09-19 IBSP Brazil Cave 10 411 IBSP 196144 1 1 Minas Gerais 2234226614 [448,1252,870,895] 2017-09-19 2017-09-26 2017-09-19 IBSP Brazil Cave 10 411 IBSP 196146 1 1 Minas Gerais 2234226747 2013-12-04 SERP Eq. Spelayon & M. T. M. Souza Brazil -19.045 Cave 21 -43.389168 Conceicao do Mato Dentro 10 411 IBSP 186379 1 1 Minas Gerais 2234226733 1931-08-02 SERP Brazil -19.183332 Cave 21 -43.26361 Morro do Pilar 10 411 IBSP 186380 1 1 Minas Gerais 2234226588 [260,1067,978,1003] SERP Brazil -19.035555 Cave 21 -43.38889 10 411 IBSP 186381 1 1 Minas Gerais 2234226536 2013-07 SERP Brazil -19.098612 Cave 21 -43.342777 10 411 IBSP 186382 1 1 Minas Gerais 2234226778 2013-07-06 SERP L. G. S. Soares Brazil -19.166111 Cave 21 -43.275276 Santo Antonio do Rio Abaixo 10 411 IBSP 186378 1 1 Minas Gerais