The reproductive cycle of Ophionereis reticulata, a common sediment-rocky shore-interface ophiuroid, was examined monthly from January 2002 to January 2003 at Praia Grande beach (São Sesbatião, state of São Paulo, Brazil). Mature individuals were found from January 2002 to April 2002 and from November 2002 to January 2003. Spawning was regcorded from January 2002 to March 2002 and from November 2002 to January 2003. Mature sperm is still present in April which could be involved in the fertilization of the last oocytes spawned in March and April. November and December marked the final point in the maturation process, with a high concentration of yolk and lipid nutrients in the oocytes. Ophionereis reticulata showed, for the period analyzed, a single spawning period, during spring and summer. © 2008 Balaban.512111118Boolootian, R.A., Reproductive physiology (1966) Physiology of Echinodermata, pp. 561-614. , R.A. Boolootian ed, Wiley-Interscience, New YorkBowmer, T., Reproduction in Amphiura filiformis (Echinodermata: Ophiuroidea): seasonality in gonad development (1982) Mar. Biol, 69, pp. 281-290Byrne, M., Ultrastructure of the ovary and oogenesis in the ovoviviparous ophiuroid Ophiolepis paucispina (Echinodermata) (1989) Biol. Bull, 176, pp. 79-95Byrne, M., Reproduction, development and population biology of the Caribbean ophiuroid Ophionereis olivacea, a protandric hermaphrodite that broods its young (1991) Mar. Biol, 111, pp. 387-399Dummont, C., Pearce, C.M., Stazicker, C., An, Y.X., Keddy, L., Can photoperiod manipulation affect gonad development of a boreo-artic echinoid (Strongylocentrotus droebachiensis) following exposure in the wild after the autumnal equinox? (2006) Mar. Biol, 149, pp. 365-378Falkner, I., Byrne, M., Reproduction of Ophiactis resiliens (Echinodermata : Ophiuroidea) in New South Wales with observations on recruitment (2003) Mar. Biol, 143, pp. 459-466Fell, H.B., Ophiuroid ecology (1966) Echinoderm Biology, pp. 129-143. , N. Millot ed, Academic Press, New YorkGage, J.D., Tyler, P.A., Growth and reproduction of the deep-sea brittlestar Ophiomusium lymani Wyville Thomson (1982) North American J. Fish. Man, 5, pp. 73-83Hendler, G., Ophiuroidea (1991) Reproduction of Marine Invertebrates, 6, pp. 355-483. , A.C. Giese, A.C. Pearse and V.B. Pearse eds, Boxwood Press, Pacific Grove, CAHendler, G., Account of Ophionereis diabloensis, a new species of brittle star, and of O. amphilogus, with information on their brooding reproduction and distribution (Echinodermata: Ophiuroidea: Ophionereididae) (2002) Proc. Biol. Soc. Wash, 115, pp. 57-74Hendler, G., Miller, J.E., Pawson, D.L., Kier, P.M., (1995) Sea Stars, Sea Urchins, and Allies: Echinoderms of Florida and the Caribbean, , Smithsonian Institution Press, WashingtonHendler, G., Tran, L.U., Reproductive biology of a deep-sea brittle star Amphiura carchara (Echinodermata: Ophiuroidea) (2001) Mar. Biol, 138, pp. 113-123McClintock, J.B., Hopkins, T., Marion, K., Watts, S., Schinner, G., Population structure, growth and reproductive biology of the gorgonocephalid brittlestar Asteroporpa annulata (1993) Bull. Mar. Sci, 52, pp. 925-936McClintock, J.B., Watts, A.S., The effects of photoperiod on gametogenesis in he tropical sea urchin Eucidaris tribuloides (Lamarck) (Echinodermata: Echinoidea) (1990) J. Exp. Mar. Biol. Ecol, 139, pp. 175-184Mladenov, P.V., Emson, R.H., Divide and broadcast: Sexual reproduction in the West Indian brittle star Ophiocomella ophiactoides and its relationship to fissiparity (1984) Mar. Biol, 81, pp. 273-282Morgan, R., Jangoux, M., Reproductive cycle and spawning induction in the gregarious brittle star Ophiotrix fragilis (Echinodermata) in the Oosterschelde (Netherlands) (2002) Invert. Reprod. Develop, 42, pp. 145-155Rumrill, S.S., Pearse, J.S., Contrasting reproductive periodicities among northeastern Pacific ophiuroids (1984) Echinodermata. Proc. 5th Internat. Echinoderm Conference, pp. 633-638. , B.F. Keegan and B.D.S. O'Connor eds, A.A. Balkema, RotterdamSelvakumaraswamy, P., Byrne, M., Reproductive cycle of two populations of Ophionereis schayeri (Ophiuroidea) in New South Wales (1995) Mar. Biol, 124, pp. 85-97Selvakumaraswamy, P., Byrne, M., Reproduction, spawning, and development of 5 ophiuroids from Australia and New Zealand (2000) Invert. Biol, 119, pp. 394-402Shpigel, M., McBride, S.C., Marciano, S., Lupatsch, I., The effect of photoperiod and temperature on the repro-duction of European sea urchin Paracentrotus lividus (2004) Aquaculture, 232, pp. 343-355Singletary, R., The biology and ecology of Amphioplus coniortodes, Ophionepthys limicola, and Micropholis gracillima (Ophiuroidea: Amphiuridae) (1980) Carib. J. Sci, 16, pp. 39-55Stewart, B.G., Mladenov, P.V., Reproductive periodicity in the euryalinid snake star Astrobrachion constrictum in a New Zealand fiord (1995) Mar. Biol, 123, pp. 543-553Tyler, P.A., Seasonal variation and ecology of gametogenesis in the genus Ophiura (Ophiuroidea: Echinodermata) from the Bristol Channel (1977) J. Exp. Mar. Biol. Ecol, 30, pp. 185-197Tyler, P.A., Gage, J.D., Reproduction and growth of the deep-sea brittlestar Ophiura ljungmani (Lyman) (1980) Oceanol. Acta, 3, pp. 177-185