{{Italic title}} {{Automatic_taxobox | image = Nevadella perfecta USNM PAL 60081.jpg | image_caption = Callavia | fossil_range = {{fossil range|Atdabanian}} | taxon = Callavia | authority = Matthew, 1897<ref name='Lieberman 1998'>{{cite journal|last1=Lieberman |first1=B.S. |year=1998 |title=Cladistic analysis of the Early Cambrian olenelloid trilobites |journal=Journal of Paleontology |volume=72 |issue=1 |pages=59–78 |doi=10.1017/S0022336000024021 |bibcode=1998JPal...72...59L |s2cid=86307339 }}</ref><ref name=Lieberman2001>{{cite journal|last= Lieberman|first= B.S.|year= 2001|title= Phylogenetic analysis of the ''Olenellina'' Walcott, 1890 (Trilobita, Cambrian)|journal= Journal of Paleontology|volume= 75|number= 1|pages= 96–115|url= http://www.bioone.org/doi/full/10.1666/0022-3360%282001%29075%3C0096%APAOTOW%3E2.0.CO%3B2|doi=10.1666/0022-3360(2001)075<0096:PAOTOW>2.0.CO;2|url-access= subscription}}</ref>| subdivision_ranks = Species | subdivision = *'''''C. broeggeri''''' <small>Walcott, 1890</small><ref name='Collantes et. al.'/> *'''''C. callavei''''' <small>Raw ''in'' Walcott, 1910</small><ref name='Lieberman2001'/> *'''''C. choffati''''' <small>Collantes et. al., 2021</small><ref name='Collantes et. al.'/> | synonyms = *''Callavia crosbyi''- synonym of ''C. broeggeri'' *''Nevadia crosbyi''- synonym of ''C. broeggeri'' *''Olenellus (Holmia) broegeri''- synonym of ''C. broeggeri'' *''Olenellus (Mesonacis) broegeri''- synonym of ''C. broeggeri'' *''Paradoxides choffati''- synonym of ''C. choffati'' *''Callavia hastata''- synonym of ''C. callavei'' *''Callavia? lotzei''- synonym of ''C. choffati''
}} '''''Callavia''''' is an extinct genus of trilobite arthropods. '''''Callavia''''' lived during the late Atdabanian stage, which lasted from 530 to 524 million years ago during the early part of the Cambrian Period<ref name="Sepkoski">{{cite journal|last=Sepkoski |first=Jack |author-link=Jack Sepkoski |title=A compendium of fossil marine animal genera (Trilobita entry) |journal=Bulletins of American Paleontology |volume=363 |pages=1–560 |year=2002 |url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class |access-date=2008-01-12 |url-status=dead |archive-url=https://web.archive.org/web/20060905162524/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class |archive-date=2006-09-05 }}</ref> in what are today Canada and the United States.
== Taxonomy == The position of ''Callavia'' in relation to other Olenellina has shifted repeatedly over time. Initially it was assigned to the Holmiinae by Pierre Hupé, and was later moved back and forth to the Callaviinae.<ref name= 'Palmer&Repina'>{{citation|last1=Palmer|first1=A.R.|last2=Repina|first2=L.N.|year=1993|title=Through a Glass Darkly: Taxonomy, Phylogeny and Biostratigraphy of the Olenellina|journal=The University of Kansas Paleontological Contributions|volume=3|pages=1–35|url=http://kuscholarworks.ku.edu/dspace/handle/1808/3760}}</ref> Lieberman, however, argues ''Callavia'' is a basal member of the Judomioidea.<ref name=Lieberman2001/>
'''Reassigned Species'''<ref name= "Collantes et. al.">{{cite journal|last1=Collantes|first1=Luis|last2=Pereira|first2=Sofia|last3=Mayoral|first3=Eduardo|last4=Liñán|first4=Eladio|last5=Gozalo|first5=Rodolfo|year=2021|title=On ''Callavia'' (Trilobita) from the Cambrian Series 2 of Iberia with systematic status of the genus|journal=Journal of Paleontology|volume=95|number=6|pages=1226–1240|url=https://www.researchgate.net/publication/353261555_On_Callavia_Trilobita_from_the_Cambrian_Series_2_of_Iberia_with_systematic_status_of_the_genus}}</ref> * ''C. bicensis'' = ''Elliptocephala walcotti'' * ''C. breviloba'' = ''Olenellina sp. indet.'' * ''C. brevioculata'' = ''Nevadella cartlandi'' * ''C. burri'' = ''Nevadia burri'' * ''C. cartlandi'' = ''Nevadella cartlandi'' * ''C. cobboldi'' = ''Nevadella cartlandi'' * ''C. eucharis'' = ''Nevadella eucharis'' * ''C.? nevadensis'' = ''Olenellus nevadensis'' * ''C. perfecta'' = ''Nevadella perfecta''
== Distribution == ''C. broeggeri'' is known from the Lower Cambrian of Newfoundland (Brigus Formation, Branchian Series, Conception Bay), Nova Scotia (between Docters Brook and Malignant Brook, northernmost Antigonish Highlands), Canada, and Massachusetts, USA (Weymouth Formation, Pearl street, North Weymouth, and probably Hoppin Hill Reservoir, North Attleboro). ''C. choffati'' is known from the Iberian Peninsula in the Elvas Municipality in Portugal and in several localities in the Huelva Province, Spain.<ref name='Collantes et. al.'/> ''C. callavei'' is found in the Comley Limestone in Shropshire, England.
== Ecology == ''C. broeggeri'' occurs together with the bracihiopods ''Sunnaginia imbricata'' and ''Eccentrotheca kanesia'', and the agnostid ''Serrodiscus bellimarginatus''.<ref>{{Cite journal|last= Landing|first= E.|year= 1995|title= Upper Placentian-Branchian series of mainland Nova Scotia (middle-upper Lower Cambrian) faunas, paleoenvironments, and stratigraphic revision|journal= Journal of Paleontology|volume= 69|number= 3|pages= 475–495|jstor= 1306322|doi= 10.1017/S0022336000034879|bibcode= 1995JPal...69..475L|s2cid= 133094242}}</ref><ref>[https://paleobiodb.org/classic/displayCollResults?collection_no=9350 Paleobiology Database]</ref>
==See also== *''Nevadella''
== References == {{Reflist|30em}}
{{Taxonbar|from=Q26183}}
Category:Olenellina Category:Cambrian trilobites Category:Fossils of Canada Category:Fossils of the United States Category:Monotypic trilobite genera Category:Paleontology in Newfoundland and Labrador Category:Paleontology in Nova Scotia Category:Paleozoic life of Nova Scotia Category:Redlichiida genera