Misszhouia is a genus of small to average sized (up to 6 centimetres (2.4 in) long)[1] marine arthropods within the Naraoiidae family, that lived during the early Cambrian period. The only species presently known is Misszhouia longicaudata (the genus is monotypic) and the holotype was discovered in 1984.
Misszhouia was named after "Miss Zhou" (Zhou Guiqin), to honour her for her skilled preparation of Chengjiang fossils.[2]
Description
Misszhouia longicaudata is almost flat (dorso-ventrally). The upper (or dorsal) side of the body consists of a non-calcified headshield (cephalon) and tailshield (pygidium) without body segments between. The body is narrowed at the articulation between cephalon and pygidium. The long many-segmented antennae are directed forward. There are no eyes. The gut has a relatively small diameter, and there are four pairs of relatively small digestive sacs (or caeca) in the cephalon only, and no branches towards the edge of the cephalon (unlike Naraoia). There are 25 limb pairs[1] with two branches on a common base, like Naraoia and trilobites. The outer branch (or exopod) has many parallel long fine flattened side branches (setae) that probably functioned as gills with a large surface area. This exopod is attached along the whole length of the base segment (coxa) and at least the proximal part of the first segment of the inner branch (endopod). The shaft of the exopod tapers gently towards its tip. The endopod is composed of seven podomeres including a terminal claw.[2]
Differences from Naraoia
The sister genus Naraoia differ from Misszhouia longicaudata in having the following characteristics:
A large, ramifying anterior pair of digestive branches (or diverticula) almost reaching the cephalon edges.
Misszhouia has been collected from the Lower Cambrian (late Atdabanian) of China (Yu'anshan Member of the Heilinpu Formation at Maotia’shan, the classic Chengjiang locality).[2] It has also been found in the Niutitang Formation.[3]
Ecology
All Naraoids were probably marine bottom dwellers. Misszhouia probably lived as a predator or scavenger. This can be deduced from the robust and spiny basal segments of the legs, which resemble the gnathobases of trilobites. These were likely used for chewing. Such carnivorous behaviour is confirmed by the relatively small digestive system, that indicates high nutrition value food.[2]
Taxonomy
Misszhouia longicaudata was formerly considered a member of the genus Naraoia, originally known as "Naraoia longicaudata", until separated in 1997.[2][4]
References
^ abRamsköld, Lars; Chen, Jun-yuan; Edgecombe, Gregory D. & Zhou, Gui-qing (1996). "Preservational folds simulating tergite junctions in tegopeltid and naraoiid arthropods" (PDF). Lethaia. 29 (1): 15–20. doi:10.1111/j.1502-3931.1996.tb01832.x. ISSN 0024-1164.
^ abcdefChen, Jun-Yuan; Edgecombe, Gregory D. & Ramsköld, Lars (1997). "Morphological and ecological disparity in naraoiids (Arthropoda) from the Early Cambrian Chengjiang Fauna, China" (PDF). Records of the Australian Museum. 49 (1): 1–24. doi:10.3853/j.0067-1975.49.1997.249. ISSN 0067-1975.
^. The Taxonomicon. Archived from the original on 3 March 2016.
External links
Misszhouia longicaudata The Virtual Fossil Museum
January 31, 2023
misszhouia, genus, small, average, sized, centimetres, long, marine, arthropods, within, naraoiidae, family, that, lived, during, early, cambrian, period, only, species, presently, known, longicaudata, genus, monotypic, holotype, discovered, 1984, temporal, ra. Misszhouia is a genus of small to average sized up to 6 centimetres 2 4 in long 1 marine arthropods within the Naraoiidae family that lived during the early Cambrian period The only species presently known is Misszhouia longicaudata the genus is monotypic and the holotype was discovered in 1984 MisszhouiaTemporal range Atdabanian PreꞒ Ꞓ O S D C P T J K Pg N M longicaudata fossilScientific classificationKingdom AnimaliaPhylum ArthropodaOrder NektaspidaFamily NaraoiidaeGenus MisszhouiaSpecies M longicaudataBinomial name Misszhouia longicaudata Zhang amp Hou 1985 SynonymsNaraoia longicaudata Zhang amp Hou 1985 Contents 1 Etymology 2 Description 2 1 Differences from Naraoia 3 Distribution 4 Ecology 5 Taxonomy 6 References 7 External linksEtymology EditMisszhouia was named after Miss Zhou Zhou Guiqin to honour her for her skilled preparation of Chengjiang fossils 2 Description EditMisszhouia longicaudata is almost flat dorso ventrally The upper or dorsal side of the body consists of a non calcified headshield cephalon and tailshield pygidium without body segments between The body is narrowed at the articulation between cephalon and pygidium The long many segmented antennae are directed forward There are no eyes The gut has a relatively small diameter and there are four pairs of relatively small digestive sacs or caeca in the cephalon only and no branches towards the edge of the cephalon unlike Naraoia There are 25 limb pairs 1 with two branches on a common base like Naraoia and trilobites The outer branch or exopod has many parallel long fine flattened side branches setae that probably functioned as gills with a large surface area This exopod is attached along the whole length of the base segment coxa and at least the proximal part of the first segment of the inner branch endopod The shaft of the exopod tapers gently towards its tip The endopod is composed of seven podomeres including a terminal claw 2 Differences from Naraoia Edit The sister genus Naraoia differ from Misszhouia longicaudata in having the following characteristics A large ramifying anterior pair of digestive branches or diverticula almost reaching the cephalon edges A bloated mud filled gut Laterally deflected antennae 2 Distribution EditMisszhouia has been collected from the Lower Cambrian late Atdabanian of China Yu anshan Member of the Heilinpu Formation at Maotia shan the classic Chengjiang locality 2 It has also been found in the Niutitang Formation 3 Ecology EditAll Naraoids were probably marine bottom dwellers Misszhouia probably lived as a predator or scavenger This can be deduced from the robust and spiny basal segments of the legs which resemble the gnathobases of trilobites These were likely used for chewing Such carnivorous behaviour is confirmed by the relatively small digestive system that indicates high nutrition value food 2 Taxonomy EditMisszhouia longicaudata was formerly considered a member of the genus Naraoia originally known as Naraoia longicaudata until separated in 1997 2 4 References Edit a b Ramskold Lars Chen Jun yuan Edgecombe Gregory D amp Zhou Gui qing 1996 Preservational folds simulating tergite junctions in tegopeltid and naraoiid arthropods PDF Lethaia 29 1 15 20 doi 10 1111 j 1502 3931 1996 tb01832 x ISSN 0024 1164 a b c d e f Chen Jun Yuan Edgecombe Gregory D amp Ramskold Lars 1997 Morphological and ecological disparity in naraoiids Arthropoda from the Early Cambrian Chengjiang Fauna China PDF Records of the Australian Museum 49 1 1 24 doi 10 3853 j 0067 1975 49 1997 249 ISSN 0067 1975 Steiner Michael Zhu Maoyuan Zhao Yuanlong amp Erdtmann Bernd Dietrich 2005 Lower Cambrian Burgess Shale type fossil associations of South China Palaeogeography Palaeoclimatology Palaeoecology 220 1 2 129 152 doi 10 1016 j palaeo 2003 06 001 Genus Misszhouia Hierarchy The Taxonomicon Archived from the original on 3 March 2016 External links EditMisszhouia longicaudata The Virtual Fossil Museum Retrieved from https en wikipedia org w index php title Misszhouia amp oldid 1102894177, wikipedia, wiki, book, books, library,
