The New Encyclopędia Britannica: L-ZEncyclopędia Britannica, 1992 - 32 pages |
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Page 425
... toes on front feet . Order Rhachitomi Upper Mississippian through Lower Triassic ; worldwide dis- tribution ; intercentrum ( crescent - shaped structure of centrum ) not forming a complete ring , pleurocentra ( semicircular struc- tures ...
... toes on front feet . Order Rhachitomi Upper Mississippian through Lower Triassic ; worldwide dis- tribution ; intercentrum ( crescent - shaped structure of centrum ) not forming a complete ring , pleurocentra ( semicircular struc- tures ...
Page 428
... toes . Nervous system and sense organs . The nervous system is the simplest found in any four - legged animal . The generalized brain is rather small . The relatively large ce- rebrum ( collectively , the two large anterior lobes of the ...
... toes . Nervous system and sense organs . The nervous system is the simplest found in any four - legged animal . The generalized brain is rather small . The relatively large ce- rebrum ( collectively , the two large anterior lobes of the ...
Page 429
... toes ) ; external gills present ; Pliocene ( 2,500,000-7,000,000 years ago ) to present ; 1 species , native to Yugoslavia . Family Necturidae ( mud puppies ) Small to moderately large , to 45 cm ( about 12 ft ) , permanent- ly aquatic ...
... toes ) ; external gills present ; Pliocene ( 2,500,000-7,000,000 years ago ) to present ; 1 species , native to Yugoslavia . Family Necturidae ( mud puppies ) Small to moderately large , to 45 cm ( about 12 ft ) , permanent- ly aquatic ...
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