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Elkia
''Elkia'' is an extinct genus of trilobite in the order Asaphida Asaphida is a large, morphologically diverse order of trilobites found in marine strata dated from the Middle Cambrian until their extinction during the Silurian. Asaphida contains six superfamilies (Anomocaroidea, Asaphoidea, Cyclopygoidea, Di .... References Dikelocephalidae Asaphida genera Articles created by Qbugbot {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dikelocephalidae
Dikelocephalidae is a family (biology), family of trilobites, that lived during the Upper Cambrian. Relatively large eyes close to the Trilobite#Cephalon, glabella, is a shared characteristic. The following genera have been assigned to this family: *''Berkeia'' *''Blandicephalus'' *''Briscoia'' *''Camaraspoides'' *''Dikelocephalus'' *''Elkia'' *''Goumenzia'' *''Hoytaspis'' *''Iranella'' *''Kasachstanaspis'' *''Monocheilus'' *''Olimus'' *''Osceolia'' *''Parabriscoia'' *''Patalolaspis'' *''Princetonella'' *''Pterocephalops'' *''Randicephalus'' *''Stigmacephalus'' *''Taebaeksaukia'' *''Walcottaspis'' References Dikelocephalidae, Dikelocephaloidea Trilobite families Cambrian first appearances Cambrian extinctions {{asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asaphida
Asaphida is a large, morphologically diverse order of trilobites found in marine strata dated from the Middle Cambrian until their extinction during the Silurian. Asaphida contains six superfamilies (Anomocaroidea, Asaphoidea, Cyclopygoidea, Dikelocephaloidea, Remopleuridoidea and Trinucleioidea), but no suborders. Asaphids comprise some 20% of described fossil trilobites. In 2020, the superfamily Trinucleioidea was proposed to be raised to an order ( Trinucleida) and removed from Asaphida. Morphology The Asaphids generally have cephalon (head) and pygidium (tail) parts similar in size, and most species have a prominent median ventral suture. Heads are often flat, and carapace furrows in the head area are often faint or not visible. Thoracic segments typically number 5 - 12, though some species have as few as two and some as many as 30. They also generally have a wide doublure, or rim, that surrounds the cephalon. This causes some specimens to be described as having a chara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |