. . . "Systematic position and variability of the Devonian nautiloids Hercoceras and Ptenoceras from the Prague Basin (Czech Republic)."@en . . "P(DE06P04OMG009), P(GA205/05/0875)" . "The Devonian nautiloids Hercoceras Barrande, 1865 and Ptenoceras Hyatt, 1894 are closely related and should be classified within the single oncocerid family of Hercoceratidae Hyatt, 1884, which has priority before the family Ptenoceratidae Teichert, 1939. This is supported particularly by the similarity of their embryonic shell and by the character and ontogeny of ventrolateral outgrowths. The intraspecific variability of shells in Hercoceras mirum Barrande, 1865 (Lower Devonian, Prague Basin, Czech Republic) is striking and unusual among nautiloids. The variability in Ptenoceras alatum (Barrande, 1865) is also high, demonstrating fluent transitions between individual morphotypes. Therefore, the other two species of this genus described from the Pragian Stage of the Prague Basin, Ptenoceras modicum (Barrande, 1877) and Ptenoceras barrandei Zhuravleva, 1974 should be assigned to the single species Ptenoceras alatum."@en . "Bulletin of Geosciences" . . "Systematic position and variability of the Devonian nautiloids Hercoceras and Ptenoceras from the Prague Basin (Czech Republic)."@en . . . "1" . . "Turek, Vojt\u011Bch" . "Systematika a variabilita devonsk\u00FDch nautiloid\u016F Hercoceras a Ptenoceras z Pra\u017Esk\u00E9 p\u00E1nve (\u010Cesk\u00E1 republika)"@cs . "10"^^ . "454056" . . "RIV/00023272:_____/07:#0000334!RIV08-MK0-00023272" . . "1;10" . "The Devonian nautiloids Hercoceras Barrande, 1865 and Ptenoceras Hyatt, 1894 are closely related and should be classified within the single oncocerid family of Hercoceratidae Hyatt, 1884, which has priority before the family Ptenoceratidae Teichert, 1939. This is supported particularly by the similarity of their embryonic shell and by the character and ontogeny of ventrolateral outgrowths. The intraspecific variability of shells in Hercoceras mirum Barrande, 1865 (Lower Devonian, Prague Basin, Czech Republic) is striking and unusual among nautiloids. The variability in Ptenoceras alatum (Barrande, 1865) is also high, demonstrating fluent transitions between individual morphotypes. Therefore, the other two species of this genus described from the Pragian Stage of the Prague Basin, Ptenoceras modicum (Barrande, 1877) and Ptenoceras barrandei Zhuravleva, 1974 should be assigned to the single species Ptenoceras alatum." . . "RIV/00023272:_____/07:#0000334" . "[E371E72F1EA3]" . "Systematic position and variability of the Devonian nautiloids Hercoceras and Ptenoceras from the Prague Basin (Czech Republic)." . "Systematic position and variability of the Devonian nautiloids Hercoceras and Ptenoceras from the Prague Basin (Czech Republic)." . "1"^^ . . "Systematika a variabilita devonsk\u00FDch nautiloid\u016F Hercoceras a Ptenoceras z Pra\u017Esk\u00E9 p\u00E1nve (\u010Cesk\u00E1 republika)"@cs . "Cephalopoda; Nautiloidea; taxonomy; variability; Barrandian; Lower Devonian"@en . . . "1214-1119" . "CZ - \u010Cesk\u00E1 republika" . "Devon\u0161t\u00ED nautiloidi Hercoceras Barrande, 1865 a Ptenoceras Hyatt, 1894 jsou bl\u00EDzce p\u0159\u00EDbuzn\u00ED a m\u011Bli by b\u00FDt \u0159azeni do jedn\u00E9 \u010Deledi Hercoceratidae Hyatt, 1884, kter\u00E1 m\u00E1 prioritu p\u0159ed \u010Deled\u00ED Ptenoceratidae Teicher, 1939. To je podpo\u0159eno zejm\u00E9na podobnost\u00ED jejich embryon\u00E1ln\u00EDch schr\u00E1nek a charakterem a ontogenez\u00ED ventrolater\u00E1ln\u00EDch v\u00FDr\u016Fstk\u016F. Vnitrodruhov\u00E1 variabilita schr\u00E1nky druhu Hercoceras mirum Barrande, 1865 (spodn\u00ED devon, Pra\u017Esk\u00E1 p\u00E1nev, \u010Cesk\u00E1 Republika) je pozoruhodn\u00E1 a neobvykl\u00E1 mezi nautiloidy. Variabilita u druhu Ptenoceras alatum (Barrande, 1865) je tak\u00E9 vysok\u00E1 a je demonstrov\u00E1na plynul\u00FDm p\u0159echodem mezi jednotliv\u00FDmi morfotypy. Proto by dva dal\u0161\u00ED druhy tohoto rodu, popsan\u00E9 z Pragu Pra\u017Esk\u00E9 p\u00E1nve, Ptenoceras modicum (Barrande, 1877) a Ptenoceras barrandei Zhuravleva, 1974 m\u011Bly b\u00FDt za\u0159azeni do jedin\u00E9ho druhu Ptenoceras alatum."@cs . . . . . "82" . "1"^^ . .