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・ Polygonum sawatchense
・ Polygonum shastense
・ Polygonum spergulariiforme
・ Polygonum striatulum
・ Polygonum tenue
・ Polygonum utahense
・ Polygonus
・ Polygoon (newsreel)
・ Polygraff
・ PolyGram
・ Polygram (geometry)
・ PolyGram Filmed Entertainment
・ PolyGram Polska
・ Polygrammate
・ Polygrammate hebraeicum
Polygrammoceras
・ Polygrammodes
・ Polygrammodes atricosta
・ Polygrammodes auropurpuralis
・ Polygrammodes baeuscalis
・ Polygrammodes biangulalis
・ Polygrammodes citrinalis
・ Polygrammodes compositalis
・ Polygrammodes croesus
・ Polygrammodes cuneatalis
・ Polygrammodes cyamon
・ Polygrammodes delicata
・ Polygrammodes dubialis
・ Polygrammodes eaclealis
・ Polygrammodes effusalis


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Polygrammoceras : ウィキペディア英語版
Polygrammoceras

''Polygrammoceras'' is an orthoconic nautiloid that lived during the period from the middle Ordovician to the early Devonian in what is now North America and Eurasia.
The Polygrammoceras shell bears longitudinal ribs or striae separated by narrow grooves or flat shallow inner areas. As common for orthocerids sutures are straight and transverse. The siphuncle is between the center and the venter, and is empty of organic deposits with segments expanded into the chambers.
==''References''==

* Sweet, Walter C. 1964. Nautiloidea-Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc of America, and Univ Kansas Press.
*( Polygrammoceras Paleobio db )


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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