Serrasalmus rhombeus (Lacepède 1803; 41cm) is the extant redeye piranha, apredatory fish restricted to the Amazon River. Here it nests with Brycon (above). The lacrimal (tan) rims the ventral naris. The premaxilla has tall ascending processes. The quadrate and intertemporal are huge, anchoring huge jaw muscles for the large, sharp teeth. Medial skull openings, present here, are rare on fish. The maxilla has only one vestigial tooth. The torso is reduced in length, but taller. These fish travel in schools. Note the tiny second dorsal fin, indicating a close relationship to Salmo, the salmon. Serrasalmus skeleton images courtesy of ©Steve Huskey and used with permission.

Anoplogaster cornuta (Valenciennes 1833; 180 cm) is the extant common fangtooth, a deep sea relative of Clupea the herring in the LRT. Large teeth arm the jaw and prevent jaw closure. Propulision comes primarily from flapping the large pectoral fins. The skin is granular, absorbing most of the light that hits it. The species was named for the juveniles. Adults had a different name until 1955 when the two were shown to be the same. It feeds on fish, crustaceans and cephalopods. This fish is traditionally nested with pineconefish (= pineapplefish) like Monocentris.