Oncosclera schubarti (BONETTO AND EZCURRA DE DRAGO, 1967 )

Tavares-Frigo, Maria da Conceição, Volkmer-Ribeiro, Cecília, Oliveira, Ana Elenice Zanini de & Machado, Vanessa de Souza, 2015, Freshwater sponges from the Pampa Biome, Brazil, with description of a new species of Oncosclera, Neotropical Biology and Conservation 10 (3), pp. 110-122 : 115-116

Oncosclera schubarti (BONETTO AND EZCURRA DE DRAGO, 1967)

( Figures 2E ; 3E )

Spongilla (Euspongilla) schubarti Bonetto and Ezcurra de Drago (1967):339 ; (1968):429; (1970):52, 53, 56; Ezcurra de Drago and Bonetto (1969):364-367; De Rosa-Barbosa, 1984:143; Batista and Volkmer-Ribeiro (2002):125.

Examined material: BRAZIL, Rio Grande do Sul: Alegrete, EPA of Ibirapuitã, Ibirapuitã River, Estância Sá Brito , 23.III.2011, M.C. Tavares-Frigo and M. Pairet Jr. leg., MCN-POR 8845 ; 07. VI.2011, MCN-POR 8915; 29.XI.2011, MCN- POR 8900 ; 27.III.2012, MCN- POR 8913 ; 05. VI.2012, MCN-POR 8932; 20.XI.2012, MCN-POR 8938; 22.I.2013, MCN-POR 8945; Ibirapuitã River , Estância Marona, 07. VI.2011, MCN-POR 8896; 29.XI.2011, MCN- POR 8902 ; 27.III.2012, MCN-POR 8909; 05. VI.2012, MCN-POR 8929; 22.I.2013, M. C. Tavares-Frigo, A. E.Z. Oliveira and M. Pairet Jr. leg., MCN-POR 8943. Santana do Livramento , Ibirapuitã river, Passo do Ferrão, 25.III.2011, M.C. Tavares-Frigo and M. Pairet Jr. leg., MCN-POR 8843; 02.XII.2011, MCN-POR 8897; 08. VI.2012, MCN-POR 8923.

Sponge encrusting the continuous rocky bed or loose stones of the Ibirapuitã River, occurring particularly in shady banks. It occurred in three stations ( Table 1). The specimens form permanent gemmuliferous crusts that are thin, hard, reticulated, hispid, dark brown in colour, not exceeding a few centimetres, with dark greyish to brownish colouring ( Figure 2E ). Dark gemmules adhered to the substrate, forming small clusters in the peripheral region of the crusts. The spicule set conforms to the original description and redescription of the species (Bonetto and Ezcurra de Drago, 1967; De Rosa-Barbosa, 1984; Batista and Volkmer-Ribeiro, 2002) ( Figure 3E ).

Remarks: O. schubarti has confirmed records in South America, from north to south of Brazil (Volkmer-Ribeiro et al., 2008; De Rosa-Barbosa, 1984) and Argentina (Bonetto and Ezcurra Drago, 1970; Ezcurra Drago and Bonetto, 1969).

Figures

Figure 2. Photographs of the living sponge species detected in the Environmental Protection Area (EPA) of Ibirapuitã, southern Brazil. A, Heteromeyenia insignis WELTNER (1895); B, Corvospongilla seckti BONETTO and EZCURRA DE DRAGO (1966); C, Corvoheteromeyenia australis (BONETTO and EZCURRA DE DRAGO, 1966); D, Oncosclera navicella (CARTER, 1881); E, Oncosclera schubarti (BONETTO and EZCURRA DE DRAGO, 1967); F, Oncosclera rosariae n.sp. Bar = 3 cm.

Figure 3. Camera lucida drawings of the spicular sets of sponge species sampled in the Environmental Protection Area (EPA) of Ibirapuitã, southern Brazil. A, Heteromeyenia insignis WELTNER (1895); B, Corvospongilla seckti BONETTO AND EZCURRA DE DRAGO (1966); C, Corvoheteromeyenia australis (BONETTO AND EZCURRA DE DRAGO, 1966); D, Oncosclera navicella (CARTER, 1881); E, Oncosclera schubarti (BONETTO AND EZCURRA DE DRAGO, 1967); F, Oncosclera rosariae n.sp. meg: megascleres; gem: gemmoscleres; gem-1: short gemmoscleres; gem-2: long gemmoscleres; mic: microscleres; mic-1: chaela microsclere; mic- 2: birotulated microsclere). Bar = 50 micrometers.