Anderella

Anderella is a genus of synziphosurine,^[1] a paraphyletic group of fossil chelicerate arthropods.^[2][3] Anderella was regarded as part of the clade Prosomapoda.^{[2][4][5][6][3]} Fossils of the single and type species, A. parva, have been discovered in deposits of the Carboniferous period in Montana, in the United States.^[7][2] Anderella is the first^[1] and so far (as of 2020) the only Carboniferous synziphosurine being described, making it the youngest member of synziphosurines.^[3] Anderella is also one of the few synziphosurine genera with fossil showing evidence of appendages, but the details are obscure due to their poor preservation.^[1][3]

Anderella Temporal range: Mississippian PreꞒ Ꞓ O S D C P T J K Pg N
Reconstruction of Anderella parva
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Clade:	Euchelicerata
Clade:	Prosomapoda (?)
Genus:	†Anderella Moore, McKenzie & Lieberman, 2007
Type species
†Anderella parva Moore, McKenzie & Lieberman, 2007

The prosoma of Anderella possess a suboval carapace slightly longer than the externally 10-segmented opisthosoma (excluding telson).^[1] A row of axial nodes run through the opisthosomal tergites.^[1] The last 3 opisthosomal segments (which forming the postabdomen) are longer and lacking pleurae (lateral extensions).^[1]

References

1. Moore, Rachel A.; McKENZIE, Scott C.; Lieberman, Bruce S. (2007). "A Carboniferous Synziphosurine (Xiphosura) from the Bear Gulch Limestone, Montana, USA". Palaeontology. 50 (4): 1013–1019. doi:10.1111/j.1475-4983.2007.00685.x. S2CID 59449700.
2. Lamsdell, James C. (2013). "Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura". Zoological Journal of the Linnean Society. 167 (1): 1–27. doi:10.1111/j.1096-3642.2012.00874.x. ISSN 0024-4082.
3. Bicknell, Russell D. C.; Pates, Stephen (2020). "Pictorial Atlas of Fossil and Extant Horseshoe Crabs, With Focus on Xiphosurida". Frontiers in Earth Science. 8: 98. Bibcode:2020FrEaS...8...98B. doi:10.3389/feart.2020.00098. ISSN 2296-6463.
4. Selden, Paul A.; Lamsdell, James C.; Qi, Liu (2015). "An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China". Zoologica Scripta. 44 (6): 645–652. doi:10.1111/zsc.12124. ISSN 0300-3256. S2CID 55264483.
5. Lamsdell, James C.; Briggs, Derek E. G.; Liu, Huaibao P.; Witzke, Brian J.; McKay, Robert M. (2015). "A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa (USA) reveals the ground plan of eurypterids and chasmataspidids". The Science of Nature. 102 (9–10): 63. Bibcode:2015SciNa.102...63L. doi:10.1007/s00114-015-1312-5. ISSN 0028-1042. PMID 26391849. S2CID 8153035.
6. Bicknell, Russell D. C.; Lustri, Lorenzo; Brougham, Tom (2019-12-01). "Revision of "Bellinurus" carteri (Chelicerata: Xiphosura) from the Late Devonian of Pennsylvania, USA". Comptes Rendus Palevol. 18 (8): 967–976. doi:10.1016/j.crpv.2019.08.002. ISSN 1631-0683.
7. Dunlop, J. A.; Penney, D.; Jekel, D. (2018). "A summary list of fossil spiders and their relatives" (PDF). World Spider Catalog. Natural History Museum Bern. pp. 1–296.