Legrandella

{{Short description|Extinct genus of chelicerate}}

{{Automatic taxobox

| name = Legrandella

| fossil_range = {{fossil range|Devonian}}

| image = 20200815 Legrandella lombardii.png

| image_caption = Reconstruction of Legrandella lombardii

| image2 = Feart-08-00098-g005.jpg

| image2_caption = Fossils of L. lombardii, holotype (A–C, E, F) and plastoparatype (D)

| display_parents = 2

| taxon = Legrandella

| authority = Eldredge, 1974

| type_species = †Legrandella lombardii

| type_species_authority = Eldredge, 1974

| synonyms =

}}

Legrandella is a genus of synziphosurine,{{Cite journal|last1=Eldredge|first1=Niles|last2=Smith|first2=LeGrande|date=1974|title=Revision of the suborder Synziphosurina (Chelicerata, Merostomata) : with remarks on merostome phylogeny. American Museum novitates ; no. 2543|hdl=2246/2745|url=http://digitallibrary.amnh.org/handle/2246/2745|language=en-US}} 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}} Legrandella 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, L. lombardii, have been discovered in deposits of the Devonian period in Cochabamba, Bolivia.{{cite book|chapter-url=http://www.wsc.nmbe.ch/resources/fossils/Fossils20.5.pdf|title=World Spider Catalog|last1=Dunlop|first1=J. A.|last2=Penney|first2=D.|last3=Jekel|first3=D.|publisher=Natural History Museum Bern|year=2020|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}}

The prosoma of Legrandella covered by a vaulted carapace with anterior projection, blunt genal cornua (posterolateral corners), humped cardiac lobe and pairs of radiated grooves. Alongside Pseudoniscus roosevelti, Legrandella lombardii is one of the few synziphosurine species that confirmed to have lateral compound eyes.{{Cite journal|last1=Bicknell|first1=Russell D. C.|last2=Amati|first2=Lisa|last3=Ortega-Hernández|first3=Javier|date=2019-11-14|title=New insights into the evolution of lateral compound eyes in Palaeozoic horseshoe crabs|url=https://www.researchgate.net/publication/335016132|journal=Zoological Journal of the Linnean Society|language=en|volume=187|issue=4|pages=1061–1077|doi=10.1093/zoolinnean/zlz065|issn=0024-4082}} The eyes are slit-like, located just below the ophthalmic ridges on each side of the carapace. The opisthosoma is externally 11-segmented, subdivided into a 8-segmented preabdomen and 3-segmented postabdomen. Tergite of the 1st preabdomimal segment is a reduced microtergite while the remaining 7 tergite possess axial nodes and spine-like tergopleurae (lateral extension). each of the postabdominal segment is cylindrical and bore reduced tergopleurae. The telson is triangular in cross section, but the distal region is yet to be discovered.