A New Clingfish (Teleostei: Gobiesocidae) from the Mangroves of Costa Rica, with Notes on Its Ecology and Early Development

Abstract

Tomicodon abuelorum is described from the Gulf of Nicoya, Costa Rica. It is characterized by high numbers of fin rays, relatively forward placement of the dorsal fin, and the lack of a dermal flap on the anterior nostril. Adults and juveniles are common associates of Rhizophora prop roots, from which they feed on small molluscs and crustaceans at high tide. Postflexion larvae are often found attached to floating mangrove leaves, and may use them as a dispersal mechanism into mangrove root systems. Reproduction appears to be year-round. The development of the pigment pattern from the postflexion larva to adult is described. Tomicodon abuelorum most closely resembles T. prodomus from the Gulf of Guayaquil, Ecuador.