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| Common names: worm-goby (English), gobio-gusano (Espanol) |
Cerdale ionthas Jordan & Gilbert, 1882
Body short, stubby, eel-like, body height ~ 10% of SL; mouth strongly oblique, lower jaw projecting; with a V shaped notch on the side of each lower lip; 2 rows of teeth on each jaw, conical outer row, chisel-like inner row; gill opening tubular; dorsal fin spines of equal height and spacing XI-XIII, 31-34 (usually XII, 32-33), origin in front of level of pectoral fin tips; anal rays 27-31 (usually 29-31); pectoral rays 13-15 (usually 14); dorsal and anal fins unconnected to tail fin; scales separate to close-set and partly overlapping.
Overall whitish with a reticulation of heavy brown to blackish spotting and mottling, particularly on head.
Size: grows to 7.5 cm.
Habitat: occurs in very shallow water on rocky coasts, including tide pools.
Depth: 0-2 m.
Costa Rica to Ecuador.