Cymadusa filosa Savigny, 1816

Andrade, Luiz F. & Senna, André R., 2017, Four new species of Cymadusa Savigny, 1816 (Amphipoda: Ampithoidae) and new records of C. filosa Savigny, 1816 from Brazilian coast, Zootaxa 4226 (3), pp. 359-389 : 384-385

Cymadusa filosa Savigny, 1816

Material examined. 49 individuals, 23 August 1983, municipality of São Sebastião, São Paulo state, Brazil, leg. Mendes, E., associated to algae, without depth information, MNRJ 10036 ; 11 individuals, 15 December 1998, Tartaruga Beach, municipality of Armação dos Búzios, Rio de Janeiro state, Brazil, associated to algae, without depth information, CRFFP 80 ; 1 individual, 1 April 1995, Prainha Beach, municipality of Arraial do Cabo, Rio de Janeiro state, Brazil, associated to Porifera, without depth information, CRFFP 81 ; 14 individuals, 8 November 1997, Espírito Santo state (20.706°S, 35.457°W), associated to rhodoliths, without depth information, CRFFP 82 ; 22 indiviuals, 16 February 1999, Caieira Beach, municipality of Florianópolis, Santa Catarina state, Brazil, associated to algae and Bryozoa, without depth information, CRFFP 83 .

Type locality. Mediterranean Sea.

Diagnosis. Antenna 1 with a 2-articulate accessory flagellum. Antenna 2 densely setose (male). Gnathopod 1 poorly setose; merus produced to form a long,acute anteroventral lobe; carpus elongated, narrow and subrectangular. Gnathopod 2 with densely setose margins, propodal palm with posterodistal defining tooth smalland acute, mid-palmar tooth absent; dactylus subequal to palm. (Modified from Peart, 2004)

Remarks. C. filosa was the first species of the genus described for Brazilian waters. Oliveira (1953) described Grubia sardenta that later was synonymized to C. filosa by Peart (2004). However, it is possible to observe some divergences between Oliveira’s and Peart’s illustrations, especially on the elongation of the carpus of gnathopod 1 of G. sardenta , which resembles more C. icapui sp. nov. The type-material used for the drawings by Oliveira is currently lost, making it impossible to check and compare the samples with the original illustrations. The second Cymadusa species recorded for Brazilian waters is C. peartae , described by Andrade & Senna (2013) with typematerial from Rio Grande do Norte and Bahia states, both in the northeastern area.Based on recent literature review of papers from many study areas, we found the following records for C. filosa for the Brazilian coast:

São Sebastião Channel, São Paulo state ( Amaral et al. 2003, Corte et al. 2012) ; Sepetiba Bay , Rio de Janeiro state ( Cardoso et al. 2011); Coqueiro Beach, municipality of Anchieta , Espírito Santo state ( Costa & Nalesso 2006); Sebastião Gomes Reef and Siriba Island , Bahia state ( Cunha et al. 2013); coast of Rio de Janeiro state ( Bate 1862, Dana 1853); Araruama Lagoon, Rio deJaneiro state ( Da Silva et al. 2005); municipality of Matinhos , Paraná state ( Dubiaski-Silva & Masunari 1995); municipality of Ubatuba , São Paulo state ( Tararam 1977, Tanaka & Leite 1998, Jacobucci & Leite 2006, Leite et al. 2007); municipality of Caraguatatuba , São Paulo state( Tanaka & Leite 1998, 2003); municipality of Lagoinha , São Paulo state ( Tanaka & Leite 2003); Vermelha Beach , Rio de Janeiro state ( Padua et al. 2013); Piedade Beach, municipality of Jaboatão dos Guararapes , Pernambuco state ( Santos & Soares 1999); Costa Beach, municipality of Vila Velha , Espírito Santo state ( Stofel et al. 2008); Poço Beach and Prainha Beach, municipality of Itanhaém , São Paulo state ( Wakabara et al. 1983).

Besides the literature review, collection materials were examined and specimens of C. filosa were found for the following locations(previously without records for this species): coast of Espírito Santo state (20.706°S, 35.457°W) ; municipality of São Sebastião, São Paulo state; Caieira Beach, municipality of Florianópolis , Santa Catarina state; Tartaruga Beach, municipality of Armação dos Búzios , Rio de Janeiro state; Prainha Beach, municipality of Arraial do Cabo , Rio de Janeiro state.We believe that the wide distribution of C. filosa in Brazilian coast could be explained by human dispersal, as reported by Peart (2004).