Emeraldella is a genus of arthropod known from the Middle Cambrian of North America. The type species E. brocki was described in 1912 from the Burgess Shale.[1] 21 specimens of Emeraldella are known from the Greater Phyllopod bed, where they comprise < 0.1% of the community.[2] A re-study on the species was done in 2012.[3] A second species E. brutoni is known from the Wheeler Shale, which was described in 2011.[4] An additional specimen of E. brutoni was described in 2019, which revealed more of the anatomy.[5] It has been placed as a basal member of the clade Vicissicaudata within Artiopoda, a group of arthropods containing trilobites and their relatives.[5]
Caudal flaps are present on the terminal tergite, alongside an elongated spine.[3]
Emeraldella brockiedit
E. brocki is at least 60 mm in length, it possesses 12 tergites in the trunk section, with an extended telson. The attenula are long and can reach the length of the body, and are composed of more than 80 segments. Ocular structures appear to be absent in this species.[3]
Emeraldella brutoniedit
E. brutoni is up to 50 mm in length, possesses 10 trunk tergites and a clear ocellii. Unlike E. brocki, its antennae are not preserved well enough to estimate the true length.[5]
Referencesedit
^"II.—Cambrian Geology and Palæontology. No. 6: Middle Cambrian Beanchiopoda, Malacostraca, Trilobita, and Merostomata. By C. D. Walcott. Smithsonian Miscellaneous Collections, vol. lvii, No. 6 (publication 2051), 1912". Geological Magazine. 9 (8): 376–377. August 1912. Bibcode:1912GeoM....9..376.. doi:10.1017/s0016756800115006. ISSN 0016-7568.
^Caron, Jean-Bernard; Jackson, Donald A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS. 21 (5): 451–65. Bibcode:2006Palai..21..451C. doi:10.2110/palo.2003.P05-070R. JSTOR 20173022. S2CID 53646959.
^ abcStein, Martin; Selden, Paul A. (June 2012). "A restudy of the Burgess Shale (Cambrian) arthropod Emeraldella brocki and reassessment of its affinities". Journal of Systematic Palaeontology. 10 (2): 361–383. doi:10.1080/14772019.2011.566634. ISSN 1477-2019. S2CID 55018927.
^"A new Cambrian arthropod, Emeraldella brutoni, from Utah". Paleontological Contributions. 2011-09-29. doi:10.17161/PC.1808.8086. hdl:1808/8086. ISSN 1946-0279.
^ abcLerosey-Aubril, Rudy; Ortega-Hernández, Javier (2019-10-31). "Appendicular anatomy of the artiopod Emeraldella brutoni from the middle Cambrian (Drumian) of western Utah". PeerJ. 7: e7945. doi:10.7717/peerj.7945. ISSN 2167-8359. PMC6825744. PMID 31687274.
External linksedit
. Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011. Archived from the original on 2020-11-12. Retrieved 2023-01-21.
"Emeraldella, Cambrian Problematic Soft-bodied Fossil". fossilmuseum.net. from the original on 2021-11-29.
May 03, 2024
emeraldella, genus, arthropod, known, from, middle, cambrian, north, america, type, species, brocki, described, 1912, from, burgess, shale, specimens, known, from, greater, phyllopod, where, they, comprise, community, study, species, done, 2012, second, specie. Emeraldella is a genus of arthropod known from the Middle Cambrian of North America The type species E brocki was described in 1912 from the Burgess Shale 1 21 specimens of Emeraldella are known from the Greater Phyllopod bed where they comprise lt 0 1 of the community 2 A re study on the species was done in 2012 3 A second species E brutoni is known from the Wheeler Shale which was described in 2011 4 An additional specimen of E brutoni was described in 2019 which revealed more of the anatomy 5 It has been placed as a basal member of the clade Vicissicaudata within Artiopoda a group of arthropods containing trilobites and their relatives 5 EmeraldellaTemporal range Burgess Shale Drumian PreꞒ Ꞓ O S D C P T J K Pg N Emeraldella brocki Emeraldella brutoni Scientific classification Domain Eukaryota Kingdom Animalia Phylum Arthropoda unranked Artiopoda unranked Vicissicaudata Genus EmeraldellaWalcott 1912 Type species Emeraldella brockiWalcott 1912 Other species Emeraldella brutoni Stein Church amp Robison 2011 Reconstruction of Emeraldella brutoni Contents 1 Description 1 1 Emeraldella brocki 1 2 Emeraldella brutoni 2 References 3 External linksDescription editCaudal flaps are present on the terminal tergite alongside an elongated spine 3 Emeraldella brocki edit E brocki is at least 60 mm in length it possesses 12 tergites in the trunk section with an extended telson The attenula are long and can reach the length of the body and are composed of more than 80 segments Ocular structures appear to be absent in this species 3 Emeraldella brutoni edit E brutoni is up to 50 mm in length possesses 10 trunk tergites and a clear ocellii Unlike E brocki its antennae are not preserved well enough to estimate the true length 5 References edit II Cambrian Geology and Palaeontology No 6 Middle Cambrian Beanchiopoda Malacostraca Trilobita and Merostomata By C D Walcott Smithsonian Miscellaneous Collections vol lvii No 6 publication 2051 1912 Geological Magazine 9 8 376 377 August 1912 Bibcode 1912GeoM 9 376 doi 10 1017 s0016756800115006 ISSN 0016 7568 Caron Jean Bernard Jackson Donald A October 2006 Taphonomy of the Greater Phyllopod Bed community Burgess Shale PALAIOS 21 5 451 65 Bibcode 2006Palai 21 451C doi 10 2110 palo 2003 P05 070R JSTOR 20173022 S2CID 53646959 a b c Stein Martin Selden Paul A June 2012 A restudy of the Burgess Shale Cambrian arthropod Emeraldella brocki and reassessment of its affinities Journal of Systematic Palaeontology 10 2 361 383 doi 10 1080 14772019 2011 566634 ISSN 1477 2019 S2CID 55018927 A new Cambrian arthropod Emeraldella brutoni from Utah Paleontological Contributions 2011 09 29 doi 10 17161 PC 1808 8086 hdl 1808 8086 ISSN 1946 0279 a b c Lerosey Aubril Rudy Ortega Hernandez Javier 2019 10 31 Appendicular anatomy of the artiopod Emeraldella brutoni from the middle Cambrian Drumian of western Utah PeerJ 7 e7945 doi 10 7717 peerj 7945 ISSN 2167 8359 PMC 6825744 PMID 31687274 External links edit Emeraldella brocki Burgess Shale Fossil Gallery Virtual Museum of Canada 2011 Archived from the original on 2020 11 12 Retrieved 2023 01 21 Emeraldella Cambrian Problematic Soft bodied Fossil fossilmuseum net Archived from the original on 2021 11 29 Retrieved from https en wikipedia org w index php title Emeraldella amp oldid 1212184427, wikipedia, wiki, book, books, library,
