PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Clydoniceratinae

Cephalopoda - Ammonoida - Stephanoceratidae

Taxonomy

Clydoniceratidae was named by Buckman (1924). Its type is Clydoniceras.

It was reranked as the subfamily Clydoniceratinae by Enay and Mangold (2021).

It was assigned to Stephanocerataceae by Arkell (1952), Arkell et al. (1957); and to Stephanoceratidae by Enay and Mangold (2021).

Subtaxa

Bramkampia, Clydomphalites, Clydoniceras (syn. Harpoceratidarum, Benedictites) (type genus), Dhrumaites, Micromphalites, Pseudoclydoniceras, Thambites, Thamboceras

Year	Name and author
1924	Clydoniceratidae Buckman
1952	Thamboceratidae Arkell p. 278
1952	Clydoniceratidae Arkell p. 282
1957	Thamboceratidae Arkell et al. p. 290
1957	Clydoniceratidae Arkell et al. p. 291
2021	Clydoniceratinae Enay and Mangold

Age range: base of the Late/Upper Bajocian to the top of the Early/Lower Callovian or 168.60000 to 161.50000 Ma

Collections (89 total)

Time interval	Ma	Country or state	Original ID and collection number
Bajocian	170.9 - 168.2	Saudi Arabia	Thamboceras sp. (48136)
Bajocian	170.9 - 168.2	Egypt	Thamboceras mirum (170870)
Bajocian - Early/Lower Bathonian	170.9 - 165.3	Saudi Arabia	Clydoniceras avus, Thambites planus (45303)
Late/Upper Bajocian	168.6 - 168.2	Saudi Arabia	Clydoniceras avus, Thambites planus, Thambites oxynotus, Clydoniceras pseudodiscus (141338) Thambites planus (141477 141490 141492 141558) Thamboceras mirabile (184524 184525 184553)
Bathonian	168.2 - 165.3	India (Gujarat)	Micromphalites sp. (46470)
Bathonian	168.2 - 165.3	Saudi Arabia	Clydoniceras avus, Clydoniceras sp., Thambites planus, Thambites oxynotus, Clydoniceras pseudodiscus (48369) Clydoniceras avus, Thambites sp., Thambites planus, Thambites oxynotus, Clydoniceras pseudodiscus (48299) Clydoniceras sp., Dhrumaites sp., Micromphalites sp. (48485) Dhrumaites cardioceratoides (45516 45519) Dhrumaites sp. (48333 48484) Micromphalites busqueti (48452) Micromphalites busqueti, Micromphalites elegans, Micromphalites intermedius, Micromphalites clydocromphalus (48454) Micromphalites clydocromphalus (48316) Micromphalites elegans, Micromphalites vertebralis, Micromphalites intermedius, Micromphalites clydocromphalus (48455) Micromphalites pustuliferus, Micromphalites clydocromphalus (45467) Micromphalites pustuliferus, Micromphalites vertebralis, Micromphalites clydocromphalus (45464) Micromphalites sp. (48450) Micromphalites sp., Clydoniceras pseudodiscus, Micromphalites clydocromphalus (48448) Micromphalites sp., Micromphalites busqueti, Micromphalites clydocromphalus (48451) Micromphalites vertebralis, Micromphalites clydocromphalus (48307) Thambites planus (48297) Thambites planus, Clydoniceras pseudodiscus (48339) Thambites planus, Thambites oxynotus, Clydoniceras pseudodiscus (48302)
Bathonian	168.2 - 165.3	Egypt	Stringoceras pustuliferum (171221 171242)
Early/Lower Bathonian	168.2 - 165.3	Iran	Delecticeras crassum (37566)
Early/Lower Bathonian	168.2 - 165.3	Saudi Arabia	Clydoniceras pseudodiscus (184576 184579) Dhrumaites sp. (141395) Micromphalites busqueti (141353) Micromphalites clydocromphalus (141481 141565) Micromphalites elegans, Micromphalites vertebralis, Micromphalites intermedius, Micromphalites clydocromphalus (141341) Micromphalites sp. (141351 141417) Micromphalites sp., Clydoniceras pseudodiscus, Micromphalites clydocromphalus (141418) Micromphalites sp., Micromphalites busqueti, Micromphalites clydocromphalus (141352) Micromphalites vertebralis (141480) Thambites oxynotus, Clydoniceras pseudodiscus (184566) Thambites oxynotus, Thambites avus (184565) Thambites planus (184527 184528 184529 184567 184568) Thambites planus, Bramkampia steinekei (184530) Thambites sp. (184557 184558)
Late/Upper Bathonian	168.2 - 165.3	Uzbekistan	Clydoniceras delectum (187358 187359) Clydoniceras discus (187355 187356 187357)
Late/Upper Bathonian	168.2 - 165.3	Saudi Arabia	Dhrumaites cardioceratoides (184546 184547) Dhrumaites sp. (184559)
Late/Upper Bathonian	168.2 - 165.3	Madagascar (Boeny)	Micromphalites hourcqi (234082)
Late/Upper Bathonian	168.2 - 165.3	Egypt	Stringoceras pustuliferum (171207)
Late/Upper Bathonian	168.2 - 165.3	Madagascar (Toliara)	Micromphalites golenkoi (234077)
Late/Upper Bathonian	168.2 - 165.3	France	Clydoniceras discus (174437)
Late/Upper Bathonian	168.2 - 165.3	Madagascar ( Atsimo-Andrefana)	Delecticeras anjohense (234083)
Late/Upper Bathonian	168.2 - 165.3	Turkmenistan	Clydoniceras discus (187354)
Late/Upper Bathonian	168.2 - 165.3	Switzerland	Clydoniceras discus (193321 193323)
Middle Bathonian	168.2 - 165.3	Madagascar (Toamasina)	Micromphalites saintoursi (234065) Micromphalites saintoursi, Clydoniceras madagascariense (234064)
Middle Bathonian	168.2 - 165.3	Saudi Arabia	Micromphalites busqueti (184569) Micromphalites busqueti, Micromphalites clydocromphalus (184545) Micromphalites busqueti, Micromphalites elegans, Micromphalites clydocromphalus (184535 184538) Micromphalites busqueti, Micromphalites elegans, Micromphalites vertebralis, Micromphalites intermedius, Micromphalites clydocromphalus (184536) Micromphalites clydocromphalus (184580) Micromphalites elegans, Micromphalites intermedius, Micromphalites clydocromphalus (184534) Micromphalites pustuliferus (184581) Micromphalites sp. (184537)
Callovian	165.3 - 161.5	Saudi Arabia	Clydoniceras sp. (47890) Pseudoclydoniceras sp. (47895)
Early/Lower Callovian	165.3 - 161.5	Madagascar (Mahajanga)	Pseudoclydoniceras besairiei (234109)
Early/Lower Callovian	165.3 - 161.5	Madagascar	Dhrumaites sp. (98130)
Late/Upper Callovian	165.3 - 161.5	Saudi Arabia	Pseudoclydoniceras sp. (141411)