Polypterides are among the most primitive of the ray-finned
fishes, or Actinopterygii, the dominant group of modern fishes. The
long, narrow body of a Polypterus is 10 inches to 3 ft long depending on the species
and is covered by thick, rhomboid scales made of an enamel-like substance
called ganoine. Such scales were also present in the earliest
ray-finned fishes (now extinct) and are quite different from those
of other living fishes. The dorsal fin of the bichir is split into a
row of small, saillike finlets that are erected when the animal is
agitated. Like the sharks and the rays, it has a pair of spiracles.
The bichir seems especially adapted to life in dry environments.
Instead of the swim bladder of most ray-finned fishes, it has a pair
of lungs, somewhat like those of the lungfishes, which enables it to
survive out of water for several hours. It also resembles the
lungfishes in having a pair of external gills when newly hatched.
The bichir is a bottom-dwelling fish, found in the Congo and in the freshwater
rivers and lakes of Africa. When these rivers overflow in late summer, bichirs
move out to spawn in the flood marshes. It is sometimes caught as a
food fish. In addition to the ten species and six subspeciesof Polypterus, the bichir
family also includes the ropefish,Erpetoichthys calabaricus, similar in
character and distribution, but with a longer, more eellike form.
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Bichirs are classified as follows
Taxonomic hierarchy
Kingdom Animalia -- Animal
Phylum Chordata -- chordates
Subphylum Vertebrata -- , vertebrates
Superclass Osteichthyes -- bony fishes
Class Actinopterygii -- ray-finned fishes, spiny rayed fishes
Subclass Chondrostei -- paddlefishes, sturgeons
Order Polypteriformes
Family Polypteridae -- bichirs, birchers, lobed-finned pike, reed fishes
Genus Polypterus
Species(example) Polypterus senegalus senegalus - gray bichir-Cuviers bichir
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Species and sizes
maximum known sizes often smaller in captivity
Upper Jaw Species-Upper jaw protrudes past lower jaw
P. palmas palmas ('palmas' bichir)- 13"
P. palmas polli ('marbled bichir)- 14"
P. palmas buettikoferi ('buettikoferi' bichir)- 13"
P. ornatipinnis ('ornate' bichir)- 27"
P. delhezi ('armoured' or 'delhez's' bichir)- 14"
P. senegalus senegalus ('Senegal' or 'Cuiver's' bichir)- 12"
P. senegalus meridionalis- 12"
P. retropinnis retropinnis ('retropinnis' bichir)- 14"
P. retropinnis lowei ('Lowe's' bichir)- 12"
P. weeksi ('week's' bichir)- 20"
P.teugelsi(new species not described yet)
Lower Jaw Species-Lower protrudes past upper jaw
P. endlicheri endlicheri ('saddled' or 'red' bichir)- 32", possibly more
P. endlicheri congicus ('giant' or 'congo' bichir)- 39"
P. lapradei ('Lapradei' bichir)- 24"
P. bichir bichir-30+ ''
P.ansorgii*
E. calabaricus ('Ropefish')- 15"-30"
Variations
There are variations of some of the above including
short bodied
longfinned
albinoism
leustic
albino bichirs have a pink/ white body with red eyes if they are a species with pronounced markings these are often yellowish in color
.Leustic (platinum) are silver/whitish bodies with black eyes.
*There are only 3 known examples to exist and they are in museums its possible
this species is extinct.-Anne