There are eighteen extant species and subspecies in two genera:[2]
Genus Erpetoichthys
Reedfish, Erpetoichthys calabaricus Smith, 1865.
It is generally reported as grams produced per gram extant per day. A constant growth rate will therefore produce an exponential increase in biomass over time. An optimal or maximal growth rate is the maximum intrinsic growth rate of a given plant.
The cone shells of the genus Conus are a highly specialised predator with each of the more than 500 extant species each producing their own form of toxin, known as conotoxins, to target a variety of prey types (Olivera, 1997).
Extant fish in this genus primarily graze on aufwuchs--algae, small insects, crustaceans, worms, small invertebrates and detritus. Omnivorous, they should be fed greens along with the standard aquarium flakes, worms, etc.
However, the species is a synchronous protogynous hermaphrodite: juveniles begin as sexually undifferentiated, and upon maturity become females first. The largest individual in a group becomes male, as will the largest female if the extant male dies ...
 See also: Species, Fish, Water, Distribution, Color
  
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