Extendia elasmus
Descended from G. extendum, G. elasmus is much larger at a maximum of 30.48 centimeters due to their method of eating requiring size. They are voracious predators, eating anything they can swallow. They have changing diets as they grow larger and larger eating a diet of F. foliumicroeus, S. sneali, and F. cenafolius as fry. The adult diet consists of F. foliumegaeus, N. bonii, young R. pupadarco, Young R. lunga, F. hardena, young A. aquatispika, Young R. unguladontus, M. bitentaculum, young M. conchyluna, young M. fungicomendenti, Young F. catagraphahumilis, young T. pelagicus, young T. therophagus, young D. chadensis, and young G. extendum.
G.elasmus reproduces much like its ancestor, two individuals find each other and then the female releases her eggs and the eggs are fertilized by the male. Then the eggs are buried under a layer of sand The fry go up to the surface to feast on planktons and then head downwards when they are too large to sustain themselves on plankton, once they reach around 3cm long. They also retain most of the coloration of their ancestor being a sandy brown on the body and having red and yellow fin tips in males and just being sandy brown in females and juveniles.
Unlike their ancestor G.elasmus is much more solitary only grouping to mate. Cannibalism of smaller individuals is also frequent due to how voracious they are and the unfortunate resemblance of young G. elasmus to G. extendum. Unlike G.extendum they hunt both near the seafloor and in the open water where their neck is also effective to catch prey before it can dart off into safety.
