This list of the Mesozoic life of Wyoming contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Wyoming and are between 252.17 and 66 million years of age.

A

†Abielites †Abielites angusticarpus Acipenser †Acipenser eruciferus †Acutostrea †Acutostrea plumosa †Adocus †Agathaumas – type locality for genus †Agathaumas sylvestris – type locality for species †Agerostrea †Agerostrea mesenterica †Agialopous – type locality for genus †Agialopous wyomingensis – type locality for species †Albanerpeton †Albanerpeton galaktion †Albanerpeton nexuosus – type locality for species †Albertosaurus – or unidentified comparable form †Alethesaurus – type locality for genus †Alethesaurus quadratus – type locality for species †Allacodon †Allacodon lentus – type locality for species †Allacodon pumilis – type locality for species †Allognathosuchus †Allosaurus – type locality for genus †Allosaurus fragilis – type locality for species †Allosaurus jimmadseni †Alostera †Alostera saskatchewanensis – type locality for species †Alphadon †Alphadon attaragos – type locality for species †Alphadon halleyi †Alphadon marshi †Alphadon sahnii †Altacreodus †Altacreodus magnus †Alzadites †Alzadites westonensis – type locality for species †Amblotherium – type locality for genus †Amblotherium gracilis – type locality for species †Amborellites – type locality for genus †Amborellites wyomingensis – type locality for species Amia †Amia fragosa †Amia uintaensis †Amphicoelias †Amphicoelias brontodiplodocus – type locality for species †Amphidon – type locality for genus †Amphidon superstes – type locality for species †Anaklinoceras †Anaklinoceras mortoni †Anaschisma – type locality for genus †Anaschisma brachygnatha – type locality for species †Anaschisma browni – type locality for species †Anceptophyllum – type locality for genus †Anceptophyllum pulcrum – type locality for species †Anchura – tentative report †Ancorichnus †Andromeda †Andromeda grayana †Anemia †Anemia fremonti †Anemia subcretacea †Angistorhinus – type locality for genus †Angistorhinus aeolamnis – type locality for species †Angistorhinus gracilis – type locality for species †Angistorhinus grandis – type locality for species †Angistorhinus maximus – type locality for species †Anisoceras †Anisomyon †Anisomyon borealis †Anisomyon centrale †Anisomyon patelliformis †Anisomyon subovatus – or unidentified related form †Anisomyon subovulatus †Ankistrorhynchus †Ankistrorhynchus washakiensis – type locality for species †Ankylosaurus †Ankylosaurus magniventris †Anomalofusus – tentative report Anomia †Anomia tellinoides Anona †Anona robusta – tentative report †Anthrotaxopsis †Anthrotaxopsis tenuicaulis Antrimpos †Apatodonosaurus †Apatodonosaurus grayi †Apatosaurinae †Apatosaurinae – type locality for genus – informal †Apatosaurus †Apatosaurus louisae †Apatosaurus minimus †Apeibopsis – tentative report †Apeibopsis discolor †Aploconodon – type locality for genus †Aploconodon comoensis – type locality for species Aporrhais †Aporrhais biangulata †Aquilina – type locality for genus †Aquilina grossidentata – type locality for species Aralia †Aralia veatchii †Araliaephyllum †Araliaephyllum artocarpoides Araucaria †Araucarites †Araucarites cuneatus – type locality for species †Araucarites longifolia †Araucarites wyomingensis – type locality for species Arca – report made of unidentified related form or using admittedly obsolete nomenclature †Arcellites †Arcellites disciformis †Archaeotriakis †Archaeotriakis ornatus – type locality for species †Archaeotriakis rochelleae †Archaeotrigon – type locality for genus †Archaeotrigon brevimaxillus – type locality for species †Arcticoceras †Arenicolites †Aristolochites †Aristolochites brittoni †Ascarinites – type locality for genus †Ascarinites communis – type locality for species Aspideretes †Aspideretoides †Aspideretoides foveatus – or unidentified comparable form †Asplenites †Asplenites tenellum †Asplenium †Asplenium haguei †Asplenium neomexicanum †Asplenium occidentale †Astandes †Astandes densatus †Astarta †Astarta packardi Astarte †Astarte gregaria †Astarte livingstonensis †Astarte meeki †Astarte morion †Athrotaxopsis †Athrotaxopsis tenuicaulis † Atira – tentative report †Atira nebrascensis †Atokatheridium – or unidentified comparable form †Aublysodon †Aublysodon mirandus †Austrotindaria †Austrotindaria antiqua †Austrotindaria canalensis †Austrotindaria svalbardensis †Avernalia – type locality for genus †Avernalia solida – type locality for species

B

†Baculites †Baculites asper †Baculites asperiformis †Baculites baculus †Baculites clinolobatus †Baculites cobbani †Baculites codyensis †Baculites crickmayi †Baculites elaisi †Baculites eliasi †Baculites gilberti †Baculites grandis †Baculites gregoryensis †Baculites haresi †Baculites jenseni – or unidentified comparable form †Baculites mariasensis †Baculites mclearni †Baculites obtusus †Baculites perplexus †Baculites reesidei †Baculites rugosus †Baculites scotti †Baena †Baena hatcheri – type locality for species †Baena hayi – type locality for species †Baena marshi – type locality for species †Baieropsis †Baieropsis adiantifolia †Baieropsis pluripartita †Baptanodon †Baptanodon discus †Baptanodon reedi – type locality for species †Baptanodon robustus – type locality for species Barbatia – tentative report †Barosaurus †Barosaurus lentus †Basilemys †Basilemys sinuosa †Batodon †Batodon tenuis – type locality for species †Belonostomus †Belonostomus longirostris Berenicea Bombur †Borealosuchus †Borealosuchus sternbergii – type locality for species †Boremys †Borissiakoceras †Borissiakoceras orbiculatum Botula †Botula ripleyana Brachaelurus †Brachaelurus bighornensis – type locality for species †Brachiosaurus †Brachybrachium – type locality for genus †Brachybrachium brevipes – type locality for species †Brachychampsa †Brachychampsa montana †Brachyphyllum †Brachyphyllum crassum †Brontopodus – or unidentified comparable form †Brontopodus birdi †Brontosaurus – type locality for genus †Brontosaurus excelsus – type locality for species †Brontosaurus parvus – type locality for species †Brontosaurus yahnahpin – type locality for species †Bryceomys †Bullopsis †Bullopsis cretacea – or unidentified related form

C

†Cadoceras Callista †Callista deweyi †Callista peplucida †Calycoceras †Calycoceras canitaurinum †Camarasaurus – type locality for genus †Camarasaurus grandis – type locality for species †Camarasaurus lentus – type locality for species †Camborygma Campeloma †Camptomus †Camptomus amplus – type locality for species †Camptonectes †Camptonectes bellistriatus †Camptonectes distans – or unidentified comparable form †Camptonectes platessiformis †Camptonectes stygius †Camptosaurus †Camptosaurus dispar – type locality for species † Canna †Canna magnifolia – tentative report †Capillirhynchia †Capillirhynchia gallatinensis – type locality for species Cardium sp. †Carpites †Carpites lancensis †Carpites verrucosus †Carpites walcotti †Carpolithus †Carpolithus barrensis – type locality for species †Carpolithus fasciculatus †Carpolithus foenarius – type locality for species †Carpolithus montiumnigrorum – type locality for species †Carpolithus virginiensis †Carthaginites †Carthaginites aquilonius – type locality for species †Cataceramus †Cataceramus tenuilineatus †Cedrobaena †Cedrobaena brinkman †Celastrophyllum †Celastrophyllum gyminaefolium †Celastrus – tentative report †Celastrus taurinensis †Cemeterius – type locality for genus †Cemeterius monstrosus – type locality for species †Centrophoroides †Centrophoroides worlandensis – type locality for species †Cephalotaxopsis †Cephalotaxopsis magnifolia †Ceramornis – type locality for genus †Ceramornis major – type locality for species †Ceratodus †Ceratodus frazieri †Ceratodus guentheri †Ceratosaurus Cercidiphyllum †Cercidiphyllum arcticum †Cercidiphyllum ellipticum †Cercomya †Cercomya punctata †Ceritella Cerithium – tentative report †Chamops – type locality for genus †Chamops segnis – type locality for species †Champsosaurus †Champsosaurus natator †Chelonipus – or unidentified comparable form Chiloscyllium †Chiloscyllium missouriense †Chirotherium †Chirotherium barthii Chlamys †Chlamys nebrascensis †Chondroceras †Cimexomys †Cimexomys minor †Cimolestes †Cimolestes incisus – type locality for species †Cimolestes stirtoni – type locality for species †Cimolodon †Cimolodon nitidus – type locality for species †Cimolodon peregrinus – type locality for species †Cimolomys †Cimolomys clarki †Cimolomys gracilis – type locality for species †Cimolomys parvus – type locality for species †Cimolopteryx †Cimolopteryx maxima – type locality for species †Cimolopteryx rara Cinnamomum †Cinnamomum hesperium †Cissitis †Cissitis rocklandensis Cissus †Cissus lobato-crenata – tentative report †Cladoceramus †Cladoceramus undulatoplicatus – or unidentified related form Cladophlebis †Cladophlebis parva †Cladophlebis readi – type locality for species †Cladophlebis readii †Cladophlebis wyomingensis – type locality for species †Claraia †Claraia clarai †Claraia mulleri †Claraia stachei †Clemensodon – type locality for genus †Clemensodon megaloba – type locality for species †Clioscaphites †Clioscaphites saxitonianus †Clioscaphites vermiformis †Coahuilites †Coahuilites sheltoni †Coelostylina †Coelosuchus – type locality for genus †Coelosuchus reedii – type locality for species †Coelurus – type locality for genus †Coelurus fragilis – type locality for species †Collignoniceras †Collignoniceras woollgari †Colpodontosaurus – type locality for genus †Colpodontosaurus cracens – type locality for species †Comobatrachus – type locality for genus †Comobatrachus aenigmaticus – type locality for species †Comodactylus – type locality for genus †Comodactylus ostromi – type locality for species †Comodon – type locality for genus †Comodon gidleyi – type locality for species †Comonecturoides – type locality for genus †Comonecturoides marshi – type locality for species †Comotherium – type locality for genus †Comotherium richi – type locality for species †Compsemys †Compsemys victa †Confusionella †Confusionella loczyi – type locality for species †Coniophis – type locality for genus †Coniophis precedens – type locality for species †Coniopteris – tentative report †Contogenys – or unidentified comparable form †Corax †Corbicella – tentative report Corbula †Corbula crassimarginata †Corbula kanabensis †Corbula munda †Coriops †Coriops amnicolus †Cornophyllum †Cornophyllum wardii †Corosaurus †Corosaurus alcovensis Cossmannea Crassatella †Crassatella evansi †Crassidenticulum †Crassidenticulum aquilae – type locality for species †Crassidenticulum decurrens Crenella †Cretorectolobus †Cretorectolobus olsoni †Cryptometoicoceras – type locality for genus †Cryptometoicoceras mite – type locality for species †Cryptorhytis †Cryptorhytis cheyennensis †Ctenacodon – type locality for genus †Ctenacodon laticeps – type locality for species †Ctenacodon scindens – type locality for species †Ctenacodon serratus – type locality for species †Cteniogenys – type locality for genus †Cteniogenys antiquus – type locality for species †Ctenostreon †Ctenostreon gikshanensis – or unidentified comparable form Cucullaea †Cucullaea haguei †Cucullaea shumardi †Cunningtoniceras Cuspidaria †Cuspidaria variablis †Cycadeospermum †Cycadeospermum rotundatum †Cyclurus †Cyclurus fragosus †Cylindricum †Cymbophora †Cymbophora canonensis – or unidentified comparable form †Cymbophora formosa †Cymbophora holmesi †Cyperacites †Czekanowskia †Czekanowskia nervosa

D