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Psilichthys Temporal range: Lower Cretaceous Aptian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Chondrostei?
Family:	†Coccolepidae?
Genus:	†Psilichthys Hall, 1900
Type species
†Psilichthys selwyni Hall, 1900

Psilichthys is an extinct genus of prehistoric bony fish from Eumeralla Formation, the Lower Cretaceous epoch of what is now Victoria, Australia, known from single species P. selwyni. This is the first Mesozoic fossil vertebrate named from Victoria.^[1]

Classification

Due to the only known fossil of Psilichthys is incomplete holotype specimen, its classification is discussed for years. It was originally described as a possibly palaeoniscid or chondrosteid.^[2] It has also previously been referred to the family Birgeriidae. Waldman (1971) denied interpretation as chondrosteid, considering the character that lacked scales which used to classify it as acipenseriform, is misidentification and it preserved some of scales. Waldman suggested that is likely to be a palaeoniscid that belongs to Coccolepidae, although due to preservation it is tentative.^[3] It is not belong to birgeriid considering differences from Birgeria.^[3]^[4] However, if identification as acipenseriform is true, it would be the only member of that group known from the southern hemisphere.^[5]^[6]

References

^ Poropat, Stephen F.; Martin, Sarah K.; Tosolini, Anne-Marie P.; Wagstaff, Barbara E.; Bean, Lynne B.; Kear, Benjamin P.; Vickers-Rich, Patricia; Rich, Thomas H. (2018-04-03). "Early Cretaceous polar biotas of Victoria, southeastern Australia—an overview of research to date". Alcheringa: An Australasian Journal of Palaeontology. 42 (2): 157–229. Bibcode:2018Alch...42..157P. doi:10.1080/03115518.2018.1453085. ISSN 0311-5518. S2CID 133845914.
^ Hall, T. S. (1899). "A new genus and new species of fish from the Mesozoic rocks of Victoria". Proceedings of the Royal Society of Victoria. 12 (2): 147–151.
^ ^a ^b Waldman, M., 1971, A re-examination of Psilichthys selwyni Hall, from the Lower Cretaceous of Victoria: Proceedings of the Royal Society of Victoria 84:263–265
^ Romano, C. & Brinkmann, W. (2009). "Reappraisal of the lower actinopterygian Birgeria stensioei ALDINGER, 1931 (Osteichthyes; Birgeriidae) from the Middle Triassic of Monte San Giorgio (Switzerland) and Besano (Italy)". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 252: 17–31. doi:10.1127/0077-7749/2009/0252-0017.
^ Hilton, Eric J.; Forey, Peter L. (2009). "Redescription of †Chondrosteus acipenseroidesEgerton, 1858 (Acipenseriformes, †Chondrosteidae) from the lower Lias of Lyme Regis (Dorset, England), with comments on the early evolution of sturgeons and paddlefishes". Journal of Systematic Palaeontology. 7 (4): 427–453. Bibcode:2009JSPal...7..427H. doi:10.1017/s1477201909002740. ISSN 1477-2019. S2CID 86821521.
^ Berrell, Rodney W.; Boisvert, Catherine; Trinajstic, Kate; Siversson, Mikael; Alvarado-Ortega, Jesús; Cavin, Lionel; Salisbury, Steven W.; Kemp, Anne (2020-03-03). "A review of Australia's Mesozoic fishes". Alcheringa: An Australasian Journal of Palaeontology. 44 (2): 286–311. Bibcode:2020Alch...44..286B. doi:10.1080/03115518.2019.1701078. ISSN 0311-5518. S2CID 216172108.

Actinopterygian genera

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclass: Osteichthyes

Gnathostomata

see Gnathostomata
Actinopterygii	see below↓

Actinopterygii

†Austelliscus †Cheirolepis †Cuneognathus †Dialipina? †Kentuckia †Krasnoyarichthys †Ligulalepis? †Limnomis †Meemannia †Moythomasia †Naxilepis? †Orvikuina? †Osorioichthys †Palaeoneiros †Pickeringius †Raynerius †Stegotrachelus †Tegeolepis †Terenolepis?
†Howqualepididae	Donnrosenia Howqualepis
†Mimiidae	Gogosardina Mimipiscis
Post-Devonian taxa	see below↓

Post-Devonian taxa

†Adroichthys
†Aetheretmon
†Agecephalichthys
†Amblypterina
†Ambodipia
†Aneurolepis
†Angatubichthys
†Apateolepis
†Arratiaichthys
†Asarotus
†Australichthys
†Avonichthys
†Beagiascus
†Belichthys
†Bethesdaichthys
†Birgeria
†Bishofia
†Bluefieldius
†Blourugia
†Boreolepis
†Brachydegma
†Brachypareion
†Brazilichthys
†Burguklia
†Carbonilepis
†Caruichthys
†Centrolepis
†Charleuxia
†Chichia
†Coccocephalus
†Concentrilepis
†Cornuboniscus
†Cosmolepis
†Cosmoptychius
†Cretolepis
†Cylindrichthys
†Daqingshaniscus
†Disichthys
†Dmitrevichthys
†Drydenius
†Duwaichthys
†Dwykia
†Elpisopholis
†Ganolepis
†Gardinerichthys
†Gardinerpiscis
†Gondwanichthys
†Grandfieldia
†Guaymayenia
†Guntherichthys
†Gyrolepidoides
†Huanghelepis
†Hyllingea
†Illiniichthys
†Inichthys
†Irajapintoseidon
†Itararichthys
†Kalops
†Kansasiella
†Karaunguria
†Kazanichthys
†Kelliaichthys
†Kenderlichthys
†Khantausia
†Kompasia
†Kutaichthys
†Lambeia
†Lanarkichthys
†Lawrenciella
†Leptogenichthys
†Letovichthys
†Lineagruan
†Luederia
†Mansfieldiscus
†Megapteriscus
†Melanecta
†Mesembrioniscus
†Mesonichthys
†Mesopoma
†Ministrella
†Monesedeiphus
†Muensterichthys
†Myriolepis
†Nematoptychius
†Neuburgella
†Notacmon
†Novogonatodus
†Nozamichthys
†Oxypteriscus
†Pacorichthys
†Palaeobergia
†Paphosiscus
†Paradrydenius
†Paralogoniscus
†Peleichthys
†Piratata
†Phanerorhynchus
†Phanerosteon
†Praolepis
†Protamblyptera
†Pseudohaplolepis
†Psilichthys
†Pteroniscus
†Rastrolepis
†Reticulolepis
†Roslerichthys
†Rubidus
†Samarichthys
†Santosichthys
†Sceletophorus
†Schizolepis
†Senekichthys
†Sinkiangichthys
†Sinoniscus
†Sixtelia
†Sphaerolepis
†Spinofacia
†Strepheoschema
†Sundayichthys
†Tanypterichthys
†Tanyrhinichthys
†Tienshaniscus
†Trachelacanthus
†Trawdenia
†Turgoniscus
†Ufalepis
†Urosthenes
†Usclasichthys?
†Uydenia
†Uydenichthys
†Varialepis
†Wayaobulepis
†Westlepis
†Whiteichthys
†Willomorichthys
†Woodichthys
†Xingshikous
†Yogoniscus
†Yaomoshania
†Zhongweilepis

†Acrolepidae

Acrolepis
Acropholis
Challaia
Kasanilepis
Namaichthys
Plegmolepis
Progyrolepis?
Watsonichthys

†Aeduellidae

Aeduella
Bourbonnella
Decazella
Neslovicella
Platysella
Puertollanichthys
Schafeevus
Spinarichthys
Westollia

†Aesopichthyidae

Aesopichthys
Proceramala

†Amblypteridae

Amblypterus
Daphnaechelus
Korutichthys?
Lawnia
Paramblypterus
Tchekardichthys
Tholonosteon
Tholonotus

†Bobasatraniiformes

Dorypterus
Bobasatraniidae	Bobasatrania Ebenaqua Ecrinesomus?

†Canobiidae

Canobius
Schaefferius

†Discordichthyidae

Discordichthys
Geryonichthys
Mamulichthys
Mutovinia

†Eigiliidae

Eigilia
Strelnia

†Elonichthyidae

Alilepis
Elonichthys
Palaeostrugia?
Meisenheimichthys
Rhabdolepis?

†Eurynotiformes

Mesolepis Paramesolepis Proteurynotus Wardichthys
Amphicentridae	Amphicentrum Cheirodopsis Eurynotus
Styracopteridae	Benedenius Fouldenia Styracopterus