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| Common names: pike-blenny (English), trambollín-lucio (Espanol) |
Chaenopsis deltarrhis Böhlke, 1957
Body very elongate; head long; no cirri on head; snout short and wide; large fish with a notch separating head and flattened nape; long mouth, usually reaching far behind eye, tip of lower jaw projecting; tongue short; no teeth at front of roof of mouth; dorsal fin XVIII-XX, 28-30, front half of fin very tall and sail-like in adult males; anal rays II, 32-36; pectoral rays 14; tail fin rounded, joined to dorsal and anal fins.
Light green or olive, white below, often with greenish midlateral stripe and/or with series of 8-10 dark bars; female with a black ocellated spot behind 4th dorsal spine near outer edge of fin; male without spot or ocellus on front of dorsal fin.
Size: attains 7.5 cm.
Inhabits worm tubes on sand-rubble bottoms.
Depth: 5-30 m.
Costa Rica to Colombia.