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Ptychoparia
''Ptychoparia'' is a genus of ptychopariid trilobites, and is the type genus of the family Ptychopariidae, and the order Ptychopariida. Fossils of the various species are found in Middle Cambrian-aged marine strata of Eurasia and North America, about 513 ± 0.3 to 499 ± 1.7 million years ago. Description Like all Ptychopariidae, the Anatomical terms of location#Dorsal and ventral, dorsal exoskeleton in ''Ptychoparia'' has an inverse egg-shaped outline. The central raised axis, that is defined by a furrow, is moderately convex and narrow, at its widest about ⅛ of the maximum width of the headshield (or Trilobite#Cephalon, cephalon). The part of the axis in the cephalon, called glabella, tapers forward, is rounded-Leaf shape, truncate at its front, is inserted by for pairs of furrows that do not contact across the midline, and one at the back that defines the occipital ring. The fourth pair of lateral furrows curve strongly inward until parallel with the midline. A border is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychopariidae
Ptychopariidae is a family of trilobites, containing the following genera: *'' Achlysopsis'' *'' Altikolia'' *'' Altitudella'' *'' Amecephalites'' *'' Asthenopsis'' *'' Austinvillia'' *'' Balangcunaspis'' *''Bashania'' *'' Bathyholcus'' *'' Bathyocos'' *'' Billingsaspis'' *'' Binodaspis'' *''Blairella'' – see '' Neoblairella'' *'' Bolaspidina'' *'' Brunswickia'' *'' Bulkuraspis'' *'' Caborcella'' *'' Callidaspina'' *'' Callidaspis'' *'' Cathayanella'' *'' Champlainia'' *'' Chengshanaspis'' *'' Chinghisicus'' *'' Chunghwaella'' *'' Conopolus'' *'' Dananzhuangia'' *'' Deltina'' *'' Douposiella'' *'' Elrathina'' *'' Entsyna'' *'' Eodouposiella'' *'' Eokochaspis'' *'' Eosoptychoparia'' *'' Eospencia'' *'' Eurostina'' *'' Finecrestia'' *'' Gaotanaspis'' *'' Gaphuraspis'' *'' Gedongaspis'' *'' Gunnia'' *'' Hadrocephalites'' *'' Hadrokraspedon'' *'' Hamptonella'' *'' Hejinaspis'' *'' Hemicricometopus'' *'' Hewenia'' *'' Holasaphus'' *'' Horbusonia'' *'' Illtydaspis'' *'' Jangudasp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
