Fishes . Fig. 897.—Pirate Perch, Apliredoderus sayanus (Gilliams). Illinois River. as in ordinary fishes. With age it moves forward by the pro-longation of the horizontal part of the intestine or rectumThe same peculiar position of the vent is found in the berycoidgenus Paratrachichthys. In the family AphredoderidcB but one species is kijo\,Aphredoderus say anus, the pirate-perch. It reaches a length .^. -m FiQ 398.—Everglade Pigmy Perch, Elassoma everghdei Jordan. Everglades of Florida of five inches and lives in sluggish lowland streams with muddybottom from New Jersey and Minnesota to Louis
Fishes . Fig. 897.—Pirate Perch, Apliredoderus sayanus (Gilliams). Illinois River. as in ordinary fishes. With age it moves forward by the pro-longation of the horizontal part of the intestine or rectumThe same peculiar position of the vent is found in the berycoidgenus Paratrachichthys. In the family AphredoderidcB but one species is kijo\,Aphredoderus say anus, the pirate-perch. It reaches a length .^. -m FiQ 398.—Everglade Pigmy Perch, Elassoma everghdei Jordan. Everglades of Florida of five inches and lives in sluggish lowland streams with muddybottom from New Jersey and Minnesota to Louisiana. It is Percoidea, or Perch-like Fishes 511 dull green in color and feeds on insects and worms. It has noeconomic value, although extremely interesting in its anatomyand relationship. Whether the Asiiieopidcv, fresh-water fishes of the AmericanEocene, and the Erismatopteridce, of the same deposits (see page450) are related to Aphredoderus or to Percopsis is still xincertain. The Pigmy Sunfishes: Elassomidse.—One of the most primitivegroups is that of Elassoinidcc, or pigmy sunfi-hes. These are cp-
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