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Genus of extinct arthropods
counts of which differ between species (Isoxys curvirostratus has 14, while Isoxys auritus has 11). In Isoxys curvirostratus the endopods (the inner,
Isoxys
Phylum of invertebrates with jointed exoskeletons
April 2023). "Three-dimensional morphology of the biramous appendages in Isoxys from the early Cambrian of South China, and its implications for early euarthropod
Arthropod
Extinct order of arthropods
Australia. Isoxys? giganteus is known from the Early Ordovician (Tremadocian) Fezouata Formation of Morocco. If its identification as a species of Isoxys is correct
Isoxyida
Extinct genus of bivalved arthropod
Burgess Shale Collantes, Luis; Pates, Stephen. "Isoxys carbonelli and the palaeoenvironmental disparity of Isoxys during Cambrian Stage 3". Historical Biology
Surusicaris
Extinct genus of stem group arthropod
and Huo, 1990). Synonyms include Isoxys bispinata (Zhang et al., 2018) (not to be confused with Isoxys bispinatus) Isoxys sp. (Sun et al. 2021) (for the
Sunella
Extinct genus of Cambrian arthropod
XDBZ102. The paratype specimen, NWUS92-310, had previously been referred to Isoxys auritus. Both specimens were found in the Helinpu Formation in Yunnan, China
Erratus
Genus of Sunellid arthropod
1666/06-031R.1. Collantes, Luis; Pates, Stephen. "Isoxys carbonelli and the palaeoenvironmental disparity of Isoxys during Cambrian Stage 3". Historical Biology
Jinningella
Geological formation in South Australia
Konservat-Lagerstätte, and includes faunal elements such as Anomalocaris, Tuzoia, Isoxys, and Wronascolex, in common with other Burgess-Shale-type assemblages, notably
Emu_Bay_Shale
Extinct genus of arrow worm
Kiisortoqia, Pauloterminus, Isoxys and so on. Some specimens with gut contents suggest it prey on the small and abundant arthropod Isoxys volucris. Timorebestia
Timorebestia
Genus of extinct arthropod
Radiodonta Opabinia regalis Surusicaris elegans Isoxys spp. Nereocaris spp. Chuandianella ovata Megacheira Fuxianhuiida Hymenocarina Odaraia alata Pectocarididae
Cassicaris
Extinct order of arthropods
Vannier, Jean (2013-09-16). "The affinities of the cosmopolitan arthropod Isoxys and its implications for the origin of arthropods". Lethaia. 46 (4): 540–550
Hymenocarina
Extinct genus of Cambrian radiodont
Ecological reconstruction of Anomalocaris hunting Isoxys, with Anomalocaris swimming posture in the background upper left with frontal appendages outstreched
Anomalocaris
Clade of arthropods
Diagram of primitive deuteropod Isoxys curvirostratus showing upward-curling grasping first appendage as well as two branched (biramous) limbs consisting
Deuteropoda
Orders of aquatic crustaceans sharing a common name
lived in marine environments, where no extant clam shrimp inhabit today. Isoxys J. Webb (1979). "A reappraisal of the palaeoecology of conchostracans (Crustacea:
Clam_shrimp
Extinct class of arthropods
are homologous to the frontal appendages of stem-group arthropods like Isoxys and radiodonts. This identity is disputed, with other authors suggesting
Megacheira
Geological formation in China
764663. Liu, S.; Peng, J.; Wen, R.; Liang, B. (2018-06-30). "New data for Isoxys of the Balang Fauna (Cambrian Stage 4), South China". Bulletin of Geosciences:
Balang_Formation
Extinct genus of arthropods
opposed to other arthropods that have upward curling frontal appendages like Isoxys), with a prominent "elbow", and elongate upward facing endite spines on
Occacaris
Island in South Australia
are preserved three-dimensionally in calcium phosphate in the arthropods Isoxys and Oestokerkus, as in related species from the Burgess Shale. Pleistocene
Kangaroo_Island
Fossil flora and fauna of the Burgess Shale
Restoration of the nektonic environment of the site, showing a pair of Anomalocaris canadensis hunting a school of Isoxys acutangulus.
Paleobiota of the Burgess Shale
Paleobiota_of_the_Burgess_Shale
Geologic formation in British Columbia, Canada
this case the Eldon Escarpment. The soft-bodied biota preserved includes Isoxys, an eldonioid, a polychaete, a hemichordate, vendotaenids and Naraoia, alongside
Duchesnay_Formation
Extinct stem-arthropod species found in Cambrian fossil deposits
A.; Vannier, Jean (2013). "The affinities of the cosmopolitan arthropod Isoxys and its implications for the origin of arthropods". Lethaia. 46 (4): 540–550
Opabinia
Extinct genus of arthropods
Australia. Collantes, Luis; Pates, Stephen. "Isoxys carbonelli and the palaeoenvironmental disparity of Isoxys during Cambrian Stage 3". Historical Biology
Caudicaella
Geological formation in Morocco
Ordovician Fezouata Shale suggests the post Cambrian survival and gigantism of Isoxys (Isoxyda, Isoxyidae)". Historical Biology: An International Journal of Paleobiology:
Fezouata_Formation
Cambrian Lagerstätte in northern Greenland
Undersoegelse 132:51-63 M. Williams, D. J. Siveter, and J. S. Peel. 1996. Isoxys (arthropoda) from the Early Cambrian Sirius Passet Lagerstaette, North Greenland
Buen_Formation
Ordovician Fezouata Shale suggests the post Cambrian survival and gigantism of Isoxys (Isoxyda, Isoxyidae)". Historical Biology: An International Journal of Paleobiology:
2026 in arthropod paleontology
2026_in_arthropod_paleontology
Extinct order of basal arthropods
A.; Vannier, Jean (2013). "The affinities of the cosmopolitan arthropod Isoxys and its implications for the origin of arthropods". Lethaia. 46 (4): 540–550
Radiodonta
Extinct genus of nectocaridid
presence of various specimens (including the holotype) with the carapaces of Isoxys in various positions within their digestive tract. It would have used its
Nektognathus
Genus of fossil arthropod
A.; Vannier, Jean (2013). "The affinities of the cosmopolitan arthropod Isoxys and its implications for the origin of arthropods". Lethaia. 46 (4): 540–550
Kylinxia
Cambrian Lagerstätte in Greenland
to Squamacula. Siriocaris S. trollae A possible member of Lamellipedia Isoxys I. volucris, I. sp An Isoxyid arthropod Kiisortoqia K. soperi A basal arthropod
Sirius_Passet
Family of arthropods
Collantes, Luis; Pates, Stephen (2025). "Isoxys carbonelli and the palaeoenvironmental disparity of Isoxys during Cambrian Stage 3". Historical Biology
Sunellidae
Extinct genus of arthropods
ancestrally raptorial frontalmost appendages of other arthropods (e.g. Kylinxia, Isoxys). Cladogram after Losso et al. 2025: Stein, Martin; Budd, Graham E; Peel
Kuamaia
Pates (2025) revise the holotype of Isoxys carbonelli and confirm placement of this species within the genus Isoxys. Nielsen et al. (2025) study changes
2025 in arthropod paleontology
2025_in_arthropod_paleontology
differentiation in Isoxys was higher than previously considered, that the trunk of I. curvirostratus was not arthrodized, and that Isoxys was one of the earliest
2023 in arthropod paleontology
2023_in_arthropod_paleontology
List of paleobiota
retifera T. tylodensa Multiple carapaces Known from all around the world Isoxys I. wudingensis I. minor Multiple carapaces Wide distribution, one of the
List of Guanshan Biota species
List_of_Guanshan_Biota_species
Geologic formation in Utah notable for trilobite fossils
Dicranocaris guntherorum - possible habeliid? Emeraldella brocki - vicissicaudatan Isoxys Leanchoilia superlata - megacheiran Megachelicerax - chelicerate Mollisonia
Wheeler_Shale
(December 2009). "Soft-Part Preservation in two Species of the Arthropod Isoxys from the Middle Cambrian Burgess Shale of British Columbia, Canada". Acta
List_of_Cambrian_arthropods
2023). "Ontogeny and brooding strategy of the early Cambrian arthropod Isoxys minor from the Qingjiang biota". Frontiers in Ecology and Evolution. 11
Qingjiang_biota
Cambrian arthropod
Paleontology portal Arthropods portal Burgessia Hymenocaris Odaraia Perspicaris Isoxys Yohoia Leptostraca Phyllocarida History of the Burgess Shale Stephen Formation
Waptia
Member of the Langston Formation in Idaho and Utah, United States
the Spence Shale: Anomalocaris Canadaspis Caryosyntrips Dioxycaris Hurdia Isoxys Leanchoilia Meristosoma Mollisonia Sidneyia Tuzoia Utahcaris Waptia Yohoia
Spence_Shale
Reconstruction of Isoxys curvirostratus
Paleobiota of the Maotianshan Shales
Paleobiota_of_the_Maotianshan_Shales
Fossil locality of the Burgess Shale
on its frontal appendages, giving them an almost claw-like appearance. Isoxys Arthropoda Order Isoxyida A very common bivalved arthropod that occupied
Tulip_Beds
Extinct genus of arthropod
uncertain due to the lack of soft tissue remains, a close relationship with Isoxys was proposed based on similarities of their carapaces. However soft tissues
Tuzoia
A specimen of Isoxys sp. from the Balang Formation
List_of_lagerstätten
Chasmataspidida; a new genus for "Kasibelinurus" yueya Lamsdell, Xue & Selden (2013). Isoxys mackenziensis Sp. nov Valid Kimmig & Pratt Cambrian (Drumian) Rockslide
2015 in arthropod paleontology
2015_in_arthropod_paleontology
Palaeontology 41(6):1201-1213 M. Williams, D. J. Siveter, and J. S. Peel. 1996. Isoxys (arthropoda) from the Early Cambrian Sirius Passet Lagerstaette, North Greenland
List of fossiliferous stratigraphic units in Greenland
List_of_fossiliferous_stratigraphic_units_in_Greenland
Marine arthropod
Longquania bispinosa, Guangweicaris spinatus; Leanchoilia illecebrosa, Isoxys minor and I. wudingensis. Cambrian explosion Phytophilaspis Liu, Q.; Luo
Panlongia
confirm the presence of dimorphism in a large sample of individuals of Isoxys volucris from the Cambrian Sirius Passet Lagerstätte (Greenland), which
2017 in arthropod paleontology
2017_in_arthropod_paleontology
carapace shape variation and hydrodynamic performance of members of the genus Isoxys is published by Pates et al. (2021), who argue that members of this genus
2021 in arthropod paleontology
2021_in_arthropod_paleontology
S2CID 131950272. Shuai Liu; Jin Peng; Rongqin Wen; Boyan Liang (2018). "New data for Isoxys of the Balang Fauna (Cambrian Stage 4), South China". Bulletin of Geosciences
2018 in arthropod paleontology
2018_in_arthropod_paleontology
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