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

A

†Abyssochrysos – tentative report

†Abyssochrysos giganteum – type locality for species

†Acaeniotyle

†Acaeniotyle umbilicata – or unidentified related form

†Acanthoceras

†Acanthoceras rhotomagense – or unidentified related form

†Acanthoceras roguense – or unidentified related form

†Acanthoceras sherborni – or unidentified comparable form

†Acanthocircus

†Acanthocircus aculeatus

†Acanthocircus carinatus – or unidentified related form

†Acanthocircus dendroacanthos

†Acanthocircus dicranocanthos

†Acanthocircus meyerhofforum

†Acanthocircus multidentatus

†Acanthocircus polymorphus

†Acanthocircus suboblongus

†Acanthocircus trizonalis

Acanthosphaera – tentative report

†Acanthosphaera lucida

†Acastea

†Acastea acer

†Acastea bipes

†Acastea dura

†Acastea incontraria

†Acastea remusa

†Acastea tenuis

Acesta

Acharax

†Acharax stantoni

Acila

†Acila demessa

†Acila princeps

†Acrioceras

†Acrioceras hamlini

†Acrioceras vespertinum

†Acrodus

†Acrodus wempliae – type locality for species

†Acteon

†Acteon inornatus

†Acteon politus

†Acteon sullivanae

†Acteonella

†Acteonella oviformis

†Acteonina

†Acteonina berryessensis – type locality for species

†Acteonina californica

†Acteonina columnaris

†Acusten

†Acusten ordinarius

†Adelodonax

†Adelodonax altus

†Aechmella

†Agnomyax

†Agnomyax monilifer

†Aguileria – or unidentified comparable form

†Alarimella

†Alarimella anae – type locality for species

†Alarimella veta

†Aletopelta – type locality for genus

†Aletopelta coombsi – type locality for species

†Alievium

†Alievium antiquum

Amauropsis

†Amauropsis pseudoalveata

†Ambercyclus

†Ambercyclus dilleri

†Ambercyclus morganensis

†Amphidonte

†Amphidonte parasitica

†Ampullina

†Ampullina avellana

†Ampullina concipio

†Ampullina mona

†Ampullina oviformis

†Ampullina packardi

†Ampullina stantoni

Amuletum

†Anagaudryceras

†Anagaudryceras mikobokense

†Anagaudryceras sacya – or unidentified comparable form

†Anahamulina

†Anahamulina wilcoxensis

†Anarhynchia

†Anarhynchia gabbi – or unidentified comparable form

†Anasibirites

†Anasibirites desertorum

†Anasibirites kingianus – type locality for species

†Anasibirites lindgreni

†Anatomites

†Anatomites adalberti

†Anatomites damesi

†Anatomites edgari

†Anatomites externiplicatus

†Anatomites intermittens

†Anatomites konnincki

†Anatomites mendenhalli

†Anatomites obsoletus – type locality for species

†Anatomites shastensis – type locality for species

†Anatomites subintermittens – type locality for species

†Anatropites

†Anatropites hauchecornei

†Anchura

†Anchura ainikta – type locality for species

†Anchura baptos – type locality for species

†Anchura californica

†Anchura callosa

†Anchura condoniana

†Anchura falciformis

†Anchura gibbera

†Anchura halberdopsis – type locality for species

†Anchura phaba – type locality for species

†Anglonautilus

†Anglonautilus catarinae

†Angulobracchia

†Angulobracchia bulbosa

†Angulobracchia jasperensis

†Angulobracchia ozvoldovae

†Angulobracchia purisimaensis

†Anisoceras

†Anisoceras draconum

†Anisomyon

†Anisomyon meeki

†Anomalina

†Anomalina pseudopopillosa

†Anomia

†Anomia – type locality for species A – informal

†Anomia jalama

†Anomia lineata

†Anoplophora – tentative report

†Anoplophora shastensis – type locality for species

†Anthonya

†Anthonya cultriformis

†Aphaea

†Aphaea ignota

†Aphanoptyxis

†Aphanoptyxis andersoni

†Aphanoptyxis californica – type locality for species

†Aphrodina

†Aphrodina varians

†Aphrosaurus

†Aphrosaurus furlongi

Aporrhais

List of the Mesozoic life of California