FIGURE 1 in A new livebearing fish, Heterandria tuxtlaensis, from Lake Catemaco, Veracruz, Mexico (Cyprinodontiformes: Poeciliidae)

FIGURE 1. Radiograph negative of a male H. tuxtlaensis showing landmarks used for the body shape analysis. 1 — anterio-dorsal-most position on the snout; 2 — top of head where skull breaks away from the body outline; 3, 4 — origin and insertion of the dorsal fin, respectively; 5 — dorsal origin of the caudal fin (anterio-dorsal-most procurrent ray); 6 — middle of caudal fin base (between hypural plates); 7 — ventral origin of caudal fin (anterio-ventral-most procurrent ray; 8, 9 — insertion and origin of anal fin, respectively; 10 — anterior margin of pelvic fins; 11 — anterio-ventral corner of interoperculum; 12 — first branchiostegal ray at the body outline; 13 — center of orbit (eye position); 14 — junction between cranium and first vertebral centrum; 15 — vertebral centrum bearing third gonapophysis; 16 — reticular point of lower jaw