FIGURE 5 in Review of Ancistrus (Siluriformes: Loricariidae) from the northwestern Guiana Shield, Orinoco Andes, and adjacent basins with description of six new species

FIGURE 5. Heads, dorsal view, of A. Ancistrus nudiceps AUM 35623, 140.2 mm SL and B. A. patronus, holotype, AUM 39876, 83.6 mm SL demonstrating differences in head shape and tentacle pattern. Ancistrus nudiceps has a longer, more spatulate snout with the point from the edge of medial snout plates to the end of the snout (turquoise line) much shorter than the distance from the edge of the medial snout plates to a line through the anterior margins of the orbits (yellow line, dashed line is the line that demarks the anterior borders of the orbits) while the two lengths are approximately equal in A. patronus. In addition, the anterior margin of the snout plates form a rough V in A. nudiceps and a U in A. patronus (solid white line). Scale = 1 cm. Photos by J.W. Armbruster.