Several new taxa of fossil molluscs were described during the year 2025, which also saw other significant discoveries and events related to molluscan paleontology.
Ammonites NameNoveltyStatusAuthorsAgeType localityLocationNotesImageAcuticlymeniaGen. et sp. novValidBeckerDevonian (Famennian)Achguig FormationA member of the family Rectoclymeniidae. The type species is A. tafilensis.Anapachydiscus haegertiSp. novValidMcLachlanLate Cretaceous (Campanian)Northumberland Formation()A member of the family Pachydiscidae.Argolites nodosusSp. novValidVörös in Vörös et al.Middle Triassic (Ladinian)Buchenstein FormationA member of Ceratitoidea belonging to the family Danubitidae.Arpadites bercsenyiiSp. novValidVörös in Vörös et al.Middle Triassic (Ladinian)Buchenstein FormationA member of Ceratitoidea belonging to the family Danubitidae.Bajocia paiardiniiSp. novChandler & CrestaMiddle Jurassic (Bajocian)A member of the family Stephanoceratidae.Beudanticeras vineiSp. novValidDay in Jell & CookBeulia langeiSp. novValidBeckerDevonianA member of the family Hoeveliidae.Boreophylloceras subtileSp. novValidIgolnikovEarly Cretaceous()Bouleiceras goyiSp. novPaviaEarly Jurassic (Toarcian)Uanei FormationBouleiceras lanceolatumSp. novPaviaEarly Jurassic (Toarcian)Uanei FormationCostaclymenia constrictaSp. novValidBeckerDevonian (Famennian)Achguig FormationA member of the family Costaclymeniidae.Cravenoceras ulytauenseSp. novValidNikolaevaCarboniferousCyrtoclymenia riemkensisSp. novValidBeckerDevonianA member of the family Cyrtoclymeniidae.Cyrtoclymenia variseptataSp. novValidBeckerDevonian (Famennian)Achguig FormationA member of the family Cyrtoclymeniidae.Cyrtoclymenia vermillionensisSp. novValidBeckerDevonianA member of the family Cyrtoclymeniidae.Demarezites quiroziiSp. novValidAlanis-Pavón et al.PermianLas Delicias FormationA member of the family Cyclolobidae.Desmoceras (Pseudouhligella) sanrikucumSp. novValidMatsukawa & ShibataEarly CretaceousHiraiga FormationDesmoceras (Pseudouhligella) trigonumSp. novValidYoshinaga, Shigeta & MaedaEarly Cretaceous (Albian)Enokuchi FormationDouvilleiceras bifurcatumSp. novValidMatsukawa & ShibataEarly CretaceousHiraiga FormationEckhardites atmensisSp. novValidMitta in Mitta, Zenina & MeleshinMiddle Jurassic (Bathonian)A member of the family Cardioceratidae. Published online in 2026, but the issue date is listed as December 2025.Ephamulina monotuberculataSp. novValidMatsukawa & ShibataEarly Cretaceous (Aptian)Hiraiga FormationA member of the family Anisoceratidae.EteohemimicrocerasGen. et comb. novValidMeister et al.Early Jurassic (Sinemurian)A member of the family Eoderoceratidae. The type species is "Microceras" serpentinum Trueman & Williams (1927); genus also includes "Ammonites" subplanicosta Oppel (1856), "Ammonites" vitreus Simpson (1855), "Bifericeras" juengsti Guérin-Franiatte & Hoffmann (1984) and "Ammonites" lohbergensis Emerson (1870).Eubostrychoceras perplexumSp. novValidAibaLate Cretaceous (Santonian)Haborogawa FormationA member of the family Nostoceratidae.Goniatites amarensisSp. novValidKorn & EbbighausenCarboniferous (Viséan)A member of the family Goniatitidae.HerbigitesGen. et sp. novBeckerDevonian (Givetian)A member of Pharciceratoidea. The type species is H. mdourensis.HourqueigellaGen. et comb. novFrauEarly Cretaceous (Aptian)A member of the family Acrioceratidae; a new genus for "Anisoceras" carcitanense Matheron (1880).Hybonoticeras neumayriSp. novValidGrigoreLate Jurassic (Kimmeridgian)A member of the family Aspidoceratidae.Hybopeltoceras oloriziSp. novSarti et al.Late Jurassic (Tithonian)Bugarone FormationA member of the family Aspidoceratidae.Idiohamites pacificumSp. novValidMatsukawa & ShibataEarly CretaceousHiraiga FormationA member of the family Anisoceratidae.ItierellaGen. et sp. novValidPictet, Hugon & PierangeliniEarly Cretaceous (Valanginian)Grand Essert FormationA member of the family Neocomitidae. The type species is I. melognensis.JaenicerasGen. et comb. novValidParent, Ramos-Agustino & García-AlacidLate Jurassic (Tithonian)A member of the family Ataxioceratidae. The type species is "Perisphinctes" ponti Fallot & Termier (1923); genus also includes "Djurjuriceras" anularium Olóriz (1978) and "Djurjuriceras" armonicum Olóriz (1978).JurienellaGen. et comb. novValidPictet & BulotEarly Cretaceous (Hauterivian)A member of the family Neocomitidae. The type species is "Breistrofferella" peyroulensis Atrops, Autran & Reboulet (1996).KatrabocaitesGen. et comb. et sp. novValidVörös in Vörös et al.Middle Triassic (Ladinian)?A member of the family Trachyceratidae. The type species is "Anolcites" laczkoi Diener (1899); genus also includes new species K. montisregis.LanceoclymeniaGen. et comb. et sp. et nom. novValidBeckerDevonianA member of the family Rectoclymeniidae. The type species is "Clymenia" subflexuosa Münster (1840); genus also includes L. dziki (a replacement name for Cyrtoclymenia acuta Czarnocki, 1989) and a new species L. kaufmanni.Lechites (Lechites) komoriiSp. novValidMatsukawa & ShibataEarly CretaceousHiraiga FormationA member of the family Baculitidae.LimoclymeniaGen. et comb. novValidBeckerDevonianA member of the family Cymaclymeniidae. The type species is "Cyrtoclymenia" tetragona Schmidt (1924).LineaclymeniaGen. et comb. novValidBeckerDevonianA member of the family Cyrtoclymeniidae. The type species is "Protactoclymenia" cara Nikolaeva & Bogoslovsky (2005).MartiniclymeniaGen. et sp. novValidBeckerDevonian (Famennian)Achguig FormationA member of the family Platyclymeniidae. The type species is M. tenens.Menabites (Delawarella) landmaniSp. novValidSealey & LucasLate Cretaceous (Campanian)Mancos Shale()A member of the family Collignoniceratidae.MereocerasGen. et comb. et sp. novValidKornCarboniferous (Bashkirian)A member of Schistoceratoidea. Genus includes "Paralegoceras" percostatum Schmidt (1955) and a new species M. cantabricum.Merocanites consequiusSp. novValidKornCarboniferous (Viséan)Zrigat FormationA member of the family Prolecanitidae.NummoclymeniaGen. et sp. novValidBeckerDevonianA member of the family Cyrtoclymeniidae. The type species is N. planata.Orientosirenites insolitusSp. novValidKonstantinovLate Triassic (Carnian)()A member of the family Sirenitidae.OufranocerasGen. et sp. novBeckerDevonian (Givetian)A member of the family Taouzitidae. The type species is O. perliratum.Owenites golozuboviSp. novValidZakharov et al.Early Triassic (Olenekian)()Paracheloniceras kazuoiSp. novValidMatsukawa & ShibataEarly CretaceousHiraiga FormationA member of the family Douvilleiceratidae.ParacyrtoclymeniaGen. et comb. et sp. novValidBeckerDevonianA member of the family Cyrtoclymeniidae. The type species is "Cyrtoclymenia" strigata House (1962); genus also includes P. campanulata (Richter, 1848), as well as new species P. hagenensis.ParadamesitesGen. et comb. et sp. novValidNishimura & MaedaLate Cretaceous (Turonian–Campanian)()A member of Desmoceratinae. The type species is "Ammonites" sugata Forbes (1846); genus also includes new species P. rectus, as well as P. compactus (Hoepen, 1921), P. rabei (Collignon, 1961), P. tsianalokyensis (Collignon, 1961).ParadicostellaGen. et sp. novValidPictet, Hugon & PierangeliniEarly Cretaceous (Valanginian)Grand Essert FormationA member of the family Neocomitidae. The type species is P. hautevillelompnesensis.ParanolcitesGen. et sp. novValidVörös in Vörös et al.Middle Triassic (Ladinian)Buchenstein FormationA member of the family Trachyceratidae. The type species is P. budaii.Phyllopachyceras iwatenseSp. novValidMatsukawa & ShibataEarly Cretaceous (Aptian)Miyako GroupPinteritesGen. et comb. novValidVörös in Vörös et al.Middle Triassic (Ladinian)Esino LimestoneA member of the family Trachyceratidae. The type species is "Trachyceras" laricum Mojsisovics (1882).PlicoclymeniaGen. et comb. novValidBeckerDevonianA member of the family Cyrtoclymeniidae. The type species is "Clymenia" cincta Münster (1839); genus also includes "Clymenia" plicata Münster (1839), "Clymenia" fasciata Phillips (1841) and a new species P. cadiconica.Preflorianites lelikoviSp. novValidZakharov et al.Early Triassic (Olenekian)()ProrsiclymeniaGen. et comb. novValidBeckerDevonianA member of the family Cyrtoclymeniidae. The type species is "Clymenia" involuta Wedekind (1908); genus also includes P. crassa (Wedekind, 1914).Protactoclymenia franconicaSp. novValidBeckerDevonianA member of the family Cyrtoclymeniidae.ProtopharcicerasGen. et comb. novBeckerDevonian (Givetian)A member of Pharciceratoidea. The type species is "Pharciceras" bidentatum Petter (1959).PseudolithancylusGen. et sp. novValidMatsukawa & ShibataEarly CretaceousHiraiga FormationA member of the family Ancyloceratidae. The type species is P. tohokuense.Puzosia (Puzosia) shimizuiSp. novValidMatsukawa & ShibataEarly CretaceousMiyako GroupRectoclymenia intercostataSp. novValidBeckerDevonianA member of the family Rectoclymeniidae.RhenoclymeniaGen. et comb. novValidBeckerDevonianA member of the family Cyrtoclymeniidae. The type species is "Clymenia" phillipsi Wedekind (1908).SanctaclymeniaGen. et comb. et sp. novValidBeckerDevonianA member of the family Cymaclymeniidae. The type species is "Rectoclymenia" retrusa Czarnocki (1989); genus also includes new species S. extrema.SchmidtoclymeniaGen. et comb. novValidBeckerDevonianA new genus for "Cyrtoclymenia" acuta Schmidt (1924).SigmoclymeniaGen. et comb. et sp. novValidBeckerDevonian (Famennian)A member of the family Cymaclymeniidae. The type species is "Falciclymenia" mirabilis Nikolaeva & Bogoslovsky (2005); genus also includes "F." falcifera Brügge (1973) and "F." cyrtostriata Kullmann (1960), as well as new species S. brueggei Becker (2025).XenoglyphiocerasGen. et sp. novValidKornCarboniferous (Viséan)Zrigat FormationA member of the family Ferganoceratidae. The type species is X. eidos.Yakutosirenites selivanovaeSp. novValidKonstantinovLate Triassic (Carnian)()A member of the family Sirenitidae.
Ammonite research * A study on factors influencing the spatial distribution of ammonites in the aftermath of the Permian–Triassic extinction event is published by Guenser et al. (2025). Đaković, Mrdak & Gawlick (2025) describe three assemblages of Anisian ammonoids from the Komarani and Bulog formations (Montenegro), including fossils of Ptychites rugifer, Megaphyllites obolus, Parakellnerites rothpletzi, Apleuroceras decrescens, Proteusites labiatus, Tropigastrites lahontanus, Proarcestes pannonicus, Proarcestes subtridentinus and Aristoptychites sp. extending known geographical ranges of these taxa. Guo et al. (2025) study the evolution of complexity of ammonoid sututres, providing evidence of morphological similarity of sutures lasting longer in earlier-occurring ammonite groups than in later-occurring ones. Description and study on the biostratigraphy of the ammonite assemblage from the Jurassic strata from Sierra de Reyes (Mendoza Province, Argentina) is published by Riccardi, Gulisano & Gutierrez-Pleimling (2025). A study on the biostratigraphy of the ammonite faunas from the Aalenian Achdorf Formation (Germany) is published by Dietze et al. (2025). A study on the composition of the Middle Jurassic ammonite fauna from the Shal Formation (Iran) is published by Majidifard & Wilmsen (2025). A study on the morphology and growth of Rehmannia richei is published by Douas Bengoudira et al. (2025). An ammonite specimen belonging to the genus Rehmannia, preserving paired Praetriaptychus aptychi within its body chamber and likely close to their original position, is described from the Jurassic (probably Callovian) strata from Quintanas de Hormiguera (Palencia, Spain) by Martínez, Ureta & García-Frank (2025). Jantschke et al. (2025) report the discovery of a diverse ammonite assemblage from the Oxfordian strata of the Sengenthal Formation (Germany).