NEREIDIDAE, GONIADIDAE, GLYCERIDAE, ONUPHIDAE AND EUNICIDAE FROM INTERTIDAL SANDY BEACHES OF THE SÃO SEBASTIÃO CHANNEL, SÃO PAULO (BRAZIL)
Steiner, T. M.1 & Amaral, A. C. Z.2
1 USP, Pós-Graduação em Zoologia, Rua do Matão, Travessa 14, no 321, São Paulo, SP, 05508-900, Brazil
2 Universidade Estadual de Campinas - IB/Depto. de Zoologia, C.P. 6109, 13083-970, Campinas, SP, Brazil
The São Sebastião Channel is located between latitudes 45o19'W to 45o30'W and longitudes 23o41'S to 23o53.5'S. The channel is 25 km long, and is bordered to the east by São Sebastião Island and to the west by the mainland. The sandy beaches selected for study are characteristic of the different kinds of intertidal environments found along both sides of the Channel: muddy sand (Araçá, Barra Velha), fine to very fine sand (Enseada, Cigarras, Grande, Segredo, Barequeçaba), medium to coarse sand (Pontal da Cruz, Siriuba, Garapocaia) and gravelly sand (São Francisco, Engenho D'Água). The main objective of the work was to carry out a systematic study of the macrofaunal polychaetes from these intertidal sandy beaches. Of the species collected, the following were studied in detail and described where necessary: Nereididae - Perinereis anderssoni Kinberg, 1866, Platynereis dumerilii (Audouin & Milne Edwards, 1834), Neanthes bruaca Lana & Sovierzoski, 1987, Laeonereis acuta (Treadewell, 1923); Goniadidae - Goniada littorea Hartman, 1950, Glycinde multidens (Fritz Müller, 1858); Glyceridae - Hemipodus olivieri Orensanz & Gianuca, 1974, H. rotundus Nonato, 1981; Onuphidae - Diopatra cuprea (Bosc, 1802), Mooreonuphis nebulosa (Moore, 1911); and Eunicidae - Nematonereis hebes Verrill, 1900, Lysidice ninetta Audouin & Milne Edwards, 1833, Lysibranchia sp.n., Eunice (Nicidion) cariboea Grube, 1856, Marphysa sp.n. A, Marphysa sp.n. B. The two new species belonging to the genus Marphysa are very similar to M. depressa, but differ in the length and number of the branchial filaments, the start site of the hooded subacicular hooks and the shape of the pectinate setae. This is the first record of the genus Lysibranchia along the Brazilian coast. It differs from the currently sole species within the genus, Lysibranchia paucibranchiata Cantone, 1983, by the presence of branchiae along the entire body. Among the described species, L. acuta was the most abundant, followed by N. hebes, D. cuprea, Marphysa sp.n. A and Marphysa sp.n. B.