Haikoucaris

	Haikoucaris ''Haikoucaris'' is a genus of megacheiran arthropod that contains the single species ''Haikoucaris ercaiensis''. It was discovered in the Cambrian Chengjiang biota of China. Morphology ''Haikoucaris'' measured about 38 mm in body length. The elongated body compose of a semicircular head shield, 13 trunk tergites and presumely a short, spine-like telson. The head possess a pair of unstalked eyes, a pair well-developed great appendages, as well as 3 more appendage pairs of unknown detail. Each of the great appendage consists of a 2-segmented peduncle and a 3-segmented claw. Each of the trunk segment possess a pair of biramus appendages that each comprising a leaf-shaped exopod and a possibly 7-segmented endopod. Paleoecology ''Haikoucaris'' may have been a predator, with its great appendages and exopod suggested to be used for hunting and swimming respectively. Taxonomy Within megacheirans, ''Haikoucaris'' is generally accepted to be a member of the clade Cheiromorpha alongs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Megacheira Megacheira ("great hands") is an extinct class of predatory arthropods that possessed a pair of great appendages, hence the class name as well as the common name "great appendage arthropods". Their taxonomic position is controversial, with studies either considering them stem-group euarthropods, or stem-group chelicerates. Most of them were found in marine environments throughout the world from the lower to middle Cambrian. Megacheirans were important components of several faunas, including the Burgess, Wheeler and Maotianshan Shales Lagerstatten. Homology of great appendages The homology between megacheiran great appendages and cephalic appendages of other arthropods had been discussed for decades. There is controversy over whether they are homologous to both dinocaridid (radiodonts and gilled lobopodians) frontal appendages, the frontalmost appendages of ''Isoxys'' and chelicerates' chelicerae. Based on neuroanatomical evidences, many studies support their homology to ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Megacheira Megacheira ("great hands") is an extinct class of predatory arthropods that possessed a pair of great appendages, hence the class name as well as the common name "great appendage arthropods". Their taxonomic position is controversial, with studies either considering them stem-group euarthropods, or stem-group chelicerates. Most of them were found in marine environments throughout the world from the lower to middle Cambrian. Megacheirans were important components of several faunas, including the Burgess, Wheeler and Maotianshan Shales Lagerstatten. Homology of great appendages The homology between megacheiran great appendages and cephalic appendages of other arthropods had been discussed for decades. There is controversy over whether they are homologous to both dinocaridid (radiodonts and gilled lobopodians) frontal appendages, the frontalmost appendages of ''Isoxys'' and chelicerates' chelicerae. Based on neuroanatomical evidences, many studies support their homology to ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Leanchoiliidae Megacheira ("great hands") is an extinct class of predatory arthropods that possessed a pair of great appendages, hence the class name as well as the common name "great appendage arthropods". Their taxonomic position is controversial, with studies either considering them stem-group euarthropods, or stem-group chelicerates. Most of them were found in marine environments throughout the world from the lower to middle Cambrian. Megacheirans were important components of several faunas, including the Burgess, Wheeler and Maotianshan Shales Lagerstatten. Homology of great appendages The homology between megacheiran great appendages and cephalic appendages of other arthropods had been discussed for decades. There is controversy over whether they are homologous to both dinocaridid (radiodonts and gilled lobopodians) frontal appendages, the frontalmost appendages of ''Isoxys'' and chelicerates' chelicerae. Based on neuroanatomical evidences, many studies support their homology to c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	List Of Chengjiang Biota Species By Phylum This is a list of fossils found at Maotianshan Shales, whose most famous assemblage of organisms are referred to as the Chengjiang biota. Phylum Arthropod, Arthropoda 80 species, not counting Dinocarida, Nektaspida and Trilobita * ''Acanthomeridion, Acanthomeridion serratum'' * ''Alalcomenaeus'' * ''Almenia, Almenia spinosa'' * ''Apiocephalus, Apiocephalus elegans'' * ''Branchiocaris, Branchiocaris yunnanensis'' * ''Canadaspis, Canadaspis laevigata'' * ''Chengjiangocaris, Chengjiangocaris longiformis'' * ''Chuandianella, Chuandianella ovata'' * ''Cindarella, Cindarella eucalla'' * ''Clypecaris, Clypecaris pteroidea'' * ''Combinivalvula, Combinivalvula chengjiangensis'' * ''Comptaluta inflata'' * ''Comptaluta leshanensis'' * ''Cyathocepalus, Cyathocepalus bispinosus'' * ''Dianchia, Dianchia mirabilis'' * ''Diplopyge'' ''D. forcipatus'' ''D. minutus'' * ''Dongshanocaris, Dongshanocaris foliiformis'' * ''Ercaia, Ercaia minuscula'' * ''Ercaicunia, Ercaicunia multinodos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Great Appendage Great appendages are claw-like appendages which attach to the heads of the "great appendage arthropods", a name usually refers to Megacheira, a class of extinct arthropod characterized by a pair of "short-great appendages" bearing in front of the animal's head. In general, megacheiran's great appendage have 6 segments, with the two proximal segments forming a peduncle and the four finger-like distal segments forming a claw, both connected by an elbow joint. Great appendages have been interpreted as raptorial limbs involved in predation, with those of some genera such as ''Yohoia'' being structurally comparable to the raptorial maxillipeds of mantis shrimp. The great appendages of leanchoilid megacheirans such as ''Leanchoilia'' and ''Yawunik'' have elongated flagella, suggesting a sensory role alongside predatory function. Radiodonta, Radiodont's frontal appendages have controversial relationships to those of the megacheirans. They have been suggested to be Homology (biology), ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]