Discocyrtanus pertenuis (Mello-Leitão, 1935) Mello-Leitao, 1935

Kury, Adriano B. & Carvalho, Rafael N., 2016, Revalidation of the Brazilian genus Discocyrtanus, with description of two new species (Opiliones: Gonyleptidae: Pachylinae), Zootaxa 4111 (2), pp. 126-144 : 137-139

Discocyrtanus pertenuis (Mello-Leitão, 1935) comb. nov.

( Figs 1 a–b, 2d, 3j–l, 9)

Discocyrtus pertenuis Mello-Leitão, 1935b: 14 , fig. 6 [wrongly reported as fig. 5]; Kury 2003: 165. Discocyrtus pectinifemur Mello-Leitão, 1937: 290 , fig. 1; Kury 2003: 164. SYN. NOV.

Discocyrtus fimbriatus Mello-Leitão, 1939: 347 , fig. 3; Kury 2003: 163. SYN. NOV.

Discocyrtus canalsi Roewer, 1943: 21 , pl. 1, figs. 9, 9a; Kury 2003: 161. SYN. NOV.

Type data. Discocyrtus pertenuis : ♂ holotype ( IBSP 0 0 1, examined), Brazil, SP, “ Guayana”. Discocyrtus pectinifemur : ♂ holotype ( IBSP 42, lost); ♀ paratype ( MZSP 595), Brazil, SP, Cabrália. Discocyrtus fimbriatus : ♂ holotype ( IBSP 84 lost), Brazil, SP, “Santa Catarina”, without further locality data. Locality probably mistaken (see below). Discocyrtus canalsi : ♂ holotype ( SMF RII 5329/87, examined by photograph), Paraguay, without further locality data.

Records. BRAZIL: SP ( H. Soares 1945, as Discocyrtus pertenuis ). SP, Guaianaz ( B. Soares, 1945, as Discocyrtus pectinifemur ). SP, Porto Cabral ( B. Soares 1945). SP, Rio Claro ( B. Soares 1945; Matthiesen 1983, as Discocyrtus pectinifemur ).

Other material examined. BRAZIL: 5 ♂ 1 ♀ ( MNRJ 18962) GO, Jandaia, Fazenda Sr. João Batista Ferreira, 04.vi.2007, Chagas A., Giupponi, A., Kury A. & Pérez-González, A.; 2 ♂ 1 ♀ ( MNRJ 6138) GO, Nova São Simão, Vila Op. CEMIG, Kisteumacher, Feio, Caramaschi; 1 ♂ ( UFMG 5830) MG, Belo Horizonte, Estação Ecológica da UFMG, -19.87722, -43.97111, 14.xi.2009, Azevedo, G.H.F.; 1 ♂ ( UFMG 12616) MG, Belo Horizonte, Piratininga, -19.84611, -43.99416, 5.xi.2012, Santos, P.H.D. 2 ♂ 7 ♀ ( MNRJ 4512) MG, Uberlândia, 02.iv.2001, Vasconcelos, E. G.; 2 ♂ 2 ♀ (MNRJ-HS 1021) MS, Selvíria, Barragem de Ilha Solteira, Urubupungá, Divisa entre os estados de MS e SP, Margem direita do Rio Paraná, lado de S. Paulo; 1 ♂ 6 ♀ ( MNRJ 4737) PR, Paranavaí, Bosque Municipal, iv.2001, Bérnils, R.; 2 ♂ ( MNRJ 9066) SP, Botucatu, iv.2000, Wienskoski, E.; 3 ♂ 2 ♀ ( MNRJ 4698) SP, Botucatu, Wienskoski, E.; 1 ♂ 1 ♀ (MNRJ-HS 793) SP, Botucatu, iv.1892, Silva, A.; 1 ♂ (MNRJ-HS 1078) SP, Botucatu, iv.1982, Silva, A.; 3 ♂ 3 ♀ 2 juv. ( MNRJ 5709) SP, Piracicaba, x.1986, Rocha, L. S.; 5 ♂ 9 ♀ (MNRJ- HS 0561) SP, Rio Claro, Horto Florestal, ii.1947, O Schubart, identified by Helia Soares (1954) as “ D. fimbriatus ”. 1 ♂ ( MNRJ 2179) SP, São Carlos, Cerrado UFSCar, 5.vi.2009, Hortencia, L.; 1 ♂ 14 juv. ( MNRJ 4388) SP, São José do Rio Preto, 16.ii.2000, Ruiz, G. R. S.; 1 ♂ ( MNRJ 4389) SP, São José do Rio Preto, 25.iv.2000, Cardoso, A. B.; 2 ♀ ( MNRJ 4390) SP, São José do Rio Preto, 15.vi.2000, Tomiosso, T. C.; 1 ♀ ( MNRJ 4392) SP, São José do Rio Preto, 15.vi.2000, Abe, K. T.; 10 ♂ 10 ♀ (MNRJ-HS 451) SP, São Simão, 1962, Garre, M.; 1 ♂ ( MNRJ 11411) SP, Teodoro Sampaio, Fazenda Alcídia, tronco podre, 1.vi.1969, Lenko, K.; 1 ♂ 1 ♀ ( MNRJ 4383); SP, Vitória Brasil, 20.iv.2000, Carvalho, F. R.;

Distribution (new records with asterisk). BRAZIL: GO: *Jandaia; *Nova São Simão. MS: *Selvíria. MG: *Belo Horizonte; *Uberlândia. PR: *Paranavaí. SP: *Botucatu; Cabrália; Guaianaz; *Piracicaba; Porto Cabral; Rio Claro; *São Carlos; *São José do Rio Preto; *São Simão; *Teodoro Sampaio; *Vitória Brasil. Paraguay, without further locality data.

Etymology. From Latin pertenuis (extremely slight, very weak).

Diagnosis. Area II posterior border not invading space of area III (what occurs in the other Discocyrtanus ). Tr IV of ♂ distal apophysis prodorsal like a hook. Fe IV dorsal proximal with 9 spines (iIiIiIiii), different than D. goyazius which has all tiny spines and D. oliverioi comb. nov. and D. tocantinensis sp. nov. that do not have spines in this area. Fe IV proventral medial-distal row of 14 spines, the last 5 spatulate with acuminate extremity (different from the rounded found in D. oliverioi comb. nov. and D. tocantinensis sp. nov.).

Male dimorphism. Beta-males with all of main structures present on the alpha form, but with a reduction of the size of dorsal scutum, length of legs and reduction of armature. There is no difference in color between the two morphs. The legs III–IV are less curved and slender in comparison of alpha form and the apophysis of Cx IV reduced, without the developed apical pointed portion.

Remarks. Discocyrtus fimbriatus is known only by the original description of the male holotype from “Santa Catarina”, which is now lost. No further material has been reported of this species, and no Discocyrtanus is known south of Paraná State. The good drawing by Roger Arlé ( Mello-Leitão 1939, fig. 3) shows the structures typical of D. pertenuis comb. nov., such as the armature of Fe IV, the apophysis format of Cx IV and Tr IV, the pattern of spines on dorsal scutum and ocularium, although a little stouter, but we do not know how schematically those spines are represented. Therefore we consider this species to be a synonym of D. pertenuis comb. nov. and the record from Santa Catarina as doubtful. Discocyrtus canalsi is known only by the male holotype (SMF RII 5329/ 87), from Paraguay, but examination of the photo of this specimen (by Pinto-da-Rocha) makes clear that the armature of Fe IV, the apophysis format of Cx IV and Tr IV, the pattern of spines on dorsal scutum and ocularium are identical to those in the male holotype of Discocyrtus pertenuis and all beta-males of this species. Therefore we consider these species to be a synonym of D. pertenuis .

Figures

FIGURE 1. Discocyrtanus spp. Living specimens. a – b. Discocyrtanus pertenuis comb. nov., males and females, from Belo Horizonte, Brazil. c – e. Discocyrtanus bugre sp. nov., one female, two males, from Chapada dos Guimarães, Mato Grosso, Brazil. Photos a – b, courtesy Pedro Martins (UFMG). Photos c – e by A. B. Kury.