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Ammagnostidae
Ammagnostidae is a family of trilobites in the suborder Agnostina, small, eyeless, isopygous trilobites with a thorax consisting of 2 segments only. Four genera have been assigned to it: ;''Ammagnostus'' Öpik, 1967 *'' Ammagnostus psammius'' Öpik, 1967 ( Type) *'' Ammagnostus bassus'' (Öpik, 1967) *'' Ammagnostus bella'' Guo & Luo, 1996 *'' Ammagnostus beltensis'' (Lochman, 1944) *'' Ammagnostus cryptus'' *'' Ammagnostus cylindratus'' Guo & Luo, 1996 *'' Ammagnostus duibianensis'' Lu & Lin, 1989 *'' Ammagnostus histus'' *'' Ammagnostus hunanensis'' *'' Ammagnostus integriceps'' Öpik, 1967 *'' Ammagnostus laiwuensis'' (Lorenz, 1906) *'' Ammagnostus mitis'' Öpik, 1967 *'' Ammagnostus sinensis'' Peng, 1987 *'' Ammagnostus wangcunensis'' Peng & Robison ;''Hadragnostus'' Öpik, 1967 *'' Hadragnostus las'' Öpik, 1967 ( Type) *'' Hadragnostus edax'' Fortey & Rushton, 1976 *'' Hadragnostus helixensis'' Jago & Cooper, 2005 *'' Hadragnostus modestus'' (Lochman, 1944) ;''Kormagnostu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agnostida
Agnostida is an order of arthropod which have classically been seen as a group of highly modified trilobites, though some recent research has doubted this placement. Regardless, they appear to be close relatives as part of the Artiopoda. They are present in the Lower Cambrian fossil record along with trilobites from the Redlichiida, Corynexochida, and Ptychopariida orders, and were highly diverse throughout the Cambrian. Agnostidan diversity severely declined during the Cambrian-Ordovician transition, and the last agnostidans went extinct in the Late Ordovician. Systematics The Agnostida are divided into two suborders — Agnostina and Eodiscina — which are then subdivided into a number of families. As a group, agnostids are isopygous, meaning their pygidium is similar in size and shape to their cephalon. Most agnostid species were eyeless. The systematic position of the order Agnostida within the class Trilobita remains uncertain, and there has been continuing deb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
