:en:Anderella

{{Short description|Extinct genus of chelicerate}}

{{Automatic taxobox

| name = Anderella

| fossil_range = {{fossil range|Mississippian}}

| image = 20200924 Anderella parva.png

| image_caption = Reconstruction of Anderella parva

| display_parents = 2

| taxon = Anderella

| authority = Moore, McKenzie & Lieberman, 2007

| type_species = †Anderella parva

| type_species_authority = Moore, McKenzie & Lieberman, 2007

| synonyms =

}}

Anderella is a genus of synziphosurine,{{Cite journal|last1=Moore|first1=Rachel A.|last2=McKENZIE|first2=Scott C.|last3=Lieberman|first3=Bruce S.|title=A Carboniferous Synziphosurine (Xiphosura) from the Bear Gulch Limestone, Montana, USA|date=2007|journal=Palaeontology|language=en|volume=50|issue=4|pages=1013–1019|doi=10.1111/j.1475-4983.2007.00685.x|s2cid=59449700 |doi-access=free}} a paraphyletic group of fossil chelicerate arthropods.{{Cite journal|last1=Bicknell|first1=Russell D. C.|last2=Pates|first2=Stephen|date=2020|title=Pictorial Atlas of Fossil and Extant Horseshoe Crabs, With Focus on Xiphosurida|journal=Frontiers in Earth Science|language=en|volume=8|page=98|doi=10.3389/feart.2020.00098|bibcode=2020FrEaS...8...98B|issn=2296-6463|doi-access=free}} Anderella was regarded as part of the clade Prosomapoda.{{Cite journal|last1=Selden|first1=Paul A.|last2=Lamsdell|first2=James C.|last3=Qi|first3=Liu|title=An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China|url=https://www.academia.edu/14633144|journal=Zoologica Scripta|year=2015 |language=en|volume=44|issue=6|pages=645–652|doi=10.1111/zsc.12124 |s2cid=55264483 |issn=0300-3256|doi-access=free}}{{Cite journal|last1=Lamsdell|first1=James C.|last2=Briggs|first2=Derek E. G.|last3=Liu|first3=Huaibao P.|last4=Witzke|first4=Brian J.|last5=McKay|first5=Robert M.|date=2015|title=A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa (USA) reveals the ground plan of eurypterids and chasmataspidids|url=https://www.researchgate.net/publication/282127302|journal=The Science of Nature|language=en|volume=102|issue=9–10|pages=63|doi=10.1007/s00114-015-1312-5|pmid=26391849|bibcode=2015SciNa.102...63L|s2cid=8153035|issn=0028-1042}}{{Cite journal|last1=Bicknell|first1=Russell D. C.|last2=Lustri|first2=Lorenzo|last3=Brougham|first3=Tom|date=2019-12-01|title=Revision of "Bellinurus" carteri (Chelicerata: Xiphosura) from the Late Devonian of Pennsylvania, USA|journal=Comptes Rendus Palevol|language=en|volume=18|issue=8|pages=967–976|doi=10.1016/j.crpv.2019.08.002|issn=1631-0683|doi-access=}} Fossils of the single and type species, A. parva, have been discovered in deposits of the Carboniferous period in Montana, in the United States.{{cite book|chapter-url=http://www.wsc.nmbe.ch/resources/fossils/Fossils19.0.pdf|title=World Spider Catalog|last1=Dunlop|first1=J. A.|last2=Penney|first2=D.|last3=Jekel|first3=D.|publisher=Natural History Museum Bern|year=2018|chapter=A summary list of fossil spiders and their relatives|pages=1–296}}{{cite journal|last=Lamsdell|first=James C.|year=2013|title=Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura|journal=Zoological Journal of the Linnean Society|volume=167|issue=1|pages=1–27|doi=10.1111/j.1096-3642.2012.00874.x|issn=0024-4082|doi-access=free}} Anderella is the first and so far (as of 2020) the only Carboniferous synziphosurine being described, making it the youngest member of synziphosurines. 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.

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