Oviparous. Eggs are demersal and adhesive , and are attached to the substrate via a filamentous, adhesive pad or pedestal . Larvae are planktonic, often found in shallow, coastal waters .
Dorsal spines (total): 12; Dorsal soft rays (total): 14 - 15; Anal spines: 2; Anal soft rays: 16 - 17; Vertebrae: 32 - 33. Dorsal fin XII.14 or 15, deeply notched between spinous and segmented-ray portions. Anal fin II,16 or 17. Pectoral fin 13 or 14 (rarely 14). Segmented caudal-fin rays 13. Vertebrae 10 + 22 or 23. Dentary incisor teeth which includes anterior canine teeth very similar in appearance with incisors, 43-51; posterior dentary canines 1 on each side. Lateral line lacking pairs of pores, terminating posteriorly at point between verticals from dorsal-fin spines 8 and 11. With cirrus on posterior rim of anterior nostril; absent on anterior rim. With bilateral pair of dark spots on the ventrolateral surface of the head in both males and females, and a dark, somewhat diffused, spot in the pectoral-fin axil. Lateral line generally extending slightly further posteriorly.: elongated; Cross section: oval.
Behavioural data for Ecsenius Isos is currently being reviewed.
Diet information for Ecsenius Isos is currently being compiled.
Oviparous, distinct pairing .
Marine; reef-associated; depth range 1 - 20 m . Tropical Central Pacific: New Hebrides (Vanuatu) and New Caledonia.
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