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・ Cyrtodactylus phongnhakebangensis
・ Cyrtodactylus quadrivirgatus
・ Cyrtodactylus ramboda
・ Cyrtodactylus rubidus
・ Cyrtodactylus soba
・ Cyrtodactylus stoliczkai
・ Cyrtodactylus subsolanus
・ Cyrtodactylus thirakhupti
・ Cyrtodactylus walli
・ Cyrtodactylus yangbayensis
・ Cyrtodesmidae
・ Cyrtodesmus depressus
・ Cyrtodesmus humerosus
・ Cyrtodesmus lobatus
・ Cyrtogomphoceras
Cyrtogomphoceratidae
・ Cyrtogonone
・ Cyrtogrammus
・ Cyrtograptus
・ Cyrtojana trilineata
・ Cyrtolabulus
・ Cyrtolaus
・ Cyrtometopus
・ Cyrtomium
・ Cyrtomium falcatum
・ Cyrtomoscelis
・ Cyrtomostoma gigas
・ Cyrtonaias
・ Cyrtonellida
・ Cyrtoneritimorpha


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

The Cyrtogomphoceratidae is a family in the cephalopod order Discosorida that comprises genera commonly with compressed, endogastrically curved shells. Siphuncles lie close to the ventral side, segments are broadly inflated, connecting rings thick and apically expanded thick bullettes. Chambers are short, separated by shallow, dish shaped septa. Apertures are generally simple.
The Cyrtogomphoceratidae are derived from the discosorid family Reudemannoceratidae, probably from ''Reudemannoceras'', through the ancestral genus ''Ulrichoceras'', and have a range from the Middle Ordovician to the Lower Silurian.
The family includes the following genera.
:
*''Cyrtogomphoceras''

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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