Acanthemblemaria rivasi lives in abandoned worm tubes in bottoms ranging from muddy rock to live massive corals.
Body elongate; short blunt head; very short blunt spines from snout back to join a rounded patch behind eyes, none on rear of nape; cirri on nostrils, over eyes (1 pair, unbranched), but not on nape; multiple rows of well-developed teeth on side of roof of mouth; dorsal fin XXI-XXII, 11-13, a notch between spiny and soft parts; anal fin II, 21-24; pelvics I (internal), 2-3, inserted before pectoral base; all fin rays unbranched; no lateral line; no scales.
Upper head and body greenish-brown; iris bright red, with an inner white ring; head tan above, blackish below, often densely speckled with tiny blue dots; sometimes a white stripe under eye along cheek; body with 3 rows of 5-10 dark spots (along top & bottom profiles, and central flank), alternating with 1-2 rows of white to pale blotches; a black spot between 1st 2 dorsal fin spines.
Source: Shorefishes of the Greater Caribbean online information
Classification: Biota > Animalia (Kingdom) > Chordata (Phylum) > Vertebrata (Subphylum) > Gnathostomata (Superclass) > Pisces (Superclass) > Actinopteri (Class) > Perciformes (Order) > Blennioidei (Suborder) > Chaenopsidae (Family) > Acanthemblemaria (Genus) > Acanthemblemaria rivasi (Species)