APOGONIDAE Apogon guamensis, 4.0 cm SL (from North Sulawesi, Indonesia; photo by Seishi Kimura) Apogon guamensis Valenciennes, 1832 Guam Cardinalfish D VII+I, 9; A II, 8; P1 13-14; LL 24. Body oblong, moderately deep and compressed; lateral line well developed, extending posteriorly to caudalfin base. Snout blunt. Posterior margin of preopercle serrated. No enlarged caninoid teeth on jaws. Base of anal fin subequal to base of second dorsal fin in length; caudal fin slightly emarginate. Color: body dark gray or gray brown dorsally, becoming pale gray ventrally, with broad darkened areas below dorsal fins; saddle-like blackish blotch on posterior part of caudal peduncle; some vague pale vertical bars on side of trunk; a wedge-shaped oblique black line from ventral margin of eye to corner of preopercle. Size: 10 cm SL. Distribution: Indo-Pacific. Remarks: inhabits rocky or coral reefs. Randall (2005) placed this species in genus Ostorhinchus, previously treated as subgenus of Apogon.