Clymeniida is an order of ammonoid cephalods from the Upper Devonian characterized by having an unusual dorsal siphuncle. They measured about 4 cm (1.6 in) in diameter and are restricted to Europe, North Africa, and possibly Australia.
Clymeniids produced a variety of shells ranging from smooth to ribbed and spinose and from evolute with all whorls exposed to strongly involute with the last whorl covering the previous. Some were even triangular as viewed from the side (along the axis of coiling). With the exception of the first few chambers, all have a siphuncle that runs along the dorsal margin, along the inside of the coils, opposite that of most ammonoids.
The siphuncle starts off ventrally, like that in other ammonoids, but after the first few septa migrates to a definite and stable dorsal position. Septal necks are retrosiphonate, characteristic of their nautlloid ancestors, and are commonly very long, forming an almost continuous siphunclular tube. Septa, characteristic of ammonoids, are convex toward the front.
Miller, Furnish, and Schindewolf, 1957, in Part L of the Treatise on Invertebrate Paleontology included three superfamilies in the Clymeniida, the Gonioclymeniaceae, Clymeniaceae, and Parawocklumeriaceae. The Gonoclymeniaceae unites five families, the Clymeniaceae three. The Parawocklumeraceae was established for a single family, the Parawocklumeriidae.
Saunders, Work, and Nikoleava, 1999, divided the Clymeniida into two suborders, the Gonioclymeniina and the Clymeniina. The Gonioclymeniina includes the Sellaclymeniaceae with 7 families and 20 genera, the Gonioclyemniacea, containing a single family with six genera, and the Parawocklumeraceae, also containing a single family, but with only three genera. The Clymeniina combines five families with a total of 36 genera into a single superfamily, the Clymeniaceae.
GONIAT Website gives two suborders which fall into the Clymeniida. They are the Clymeniina with four superfamilies and Gonioclymeniina, established for a single superfamily. In contrast, Dieter Korn, 2006 divided the Clymeniida into the Clymeniina with superfamilies and families, and Cyrtoclymenia, named by him in 2002. with superfamilies and families. Shevyrev, 2006 on the other hand divided the Clymeniida into the Clymeniina and Gonioclymeniina, as with GONIAT and Saunders, Work, and Nikolaeva
Clymeniida
Suborder Clymeniina Hyatt, 1884Superfamily Clymeniaceae Edwards, 1849Family Clymeniidae Edwards, 1849Genus Aktuboclymenia Bogoslovsky, 1979Genus Clymenia Münster, 1834Family Kosmoclymeniidae Korn and Price, 1987Subfamily Kosmoclymeniinae Korn and Price, 1987Genus Kosmoclymenia Schindewolf, 1949Genus Linguaclymenia Korn and Price, 1987Genus Lissoclymenia Korn and Price, 1987Genus Muessenbiaergia Korn and Price, 1987Subfamily Rodeckiinae Korn 2002Genus Franconiclymenia Korn and Price, 1987Genus Protoxyclymenia Schindewolf, 1923Genus Rodeckia Korn, 2002Superfamily Gonioclymeniaceae Hyatt, 1884Family Costaclymeniidae Ruzhencev, 1957Genus Costaclymenia Schindewolf, 1920Genus Endosiphonites Ansted, 1838Family Gonioclymeniidae Hyatt, 1884Genus Finiclymenia Price and Korn 1989Genus Gonioclymenia Sepkoski, Jr., 2002Genus Kalloclymenia Wedekind, 1914Genus Leviclymenia Korn, 2002Genus Mesoclymenia Bogoslovsky, 1981Family Sellaclymeniidae Schindewolf, 1923Genus Sellaclymenia Sepkoski, Jr., 2002Family Sphenoclymeniidae Korn, 1992Genus Medioclymenia Korn, 2002Genus Sphenoclymenia Schindewolf, 1920Superfamily Platyclymeniaceae Wedekind, 1914Family Glatziellidae Schindewolf, 1928Genus Glatziella Renz, 1914Genus Liroclymenia Czarnocki, 1989Genus Postglatziella Schindewolf, 1937Genus Soliclymenia Schindewolf, 1937Family Piriclymeniidae Korn, 1992Genus Ornatoclymenia Bogoslovsky, 1979Genus Piriclymenia Schindewolf, 1937Genus Sulcoclymenia Schindewolf, 1923Family Platyclymeniidae Wedekind, 1914Subfamily Nodosoclymeniinae Korn, 2002Genus Czarnoclymenia Korn, 1999Genus Nodosoclymenia Czarnocki, 1989Genus Stenoclymenia Lange, 1929Subfamily Platyclymeniinae Wedekind, 1914Genus Fasciclymenia Korn and Price, 1987Genus Platyclymenia Sepkoski, Jr., 2002Genus Progonioclymenia Schindewolf, 1937Genus Spinoclymenia Bogoslovsky, 1962Genus Trigonoclymenia Schindewolf, 1934Genus Varioclymenia Wedekind, 1908Subfamily Pleuroclymeniinae Korn, 2002Genus Borisiclymenia Korn, 2002Genus Nanoclymenia Korn, 2002Genus Pleuroclymenia Schindewolf, 1934Genus Trochoclymenia Schindewolf, 1926Superfamily Wocklumeriaceae Schindewolf, 1937Family Parawocklumeriidae Schindewolf, 1937Genus Kamptoclymenia Schindewolf, 1937Genus Parawocklumeria Schindewolf, 1926Genus Tardewocklumeria Becker, 2000Genus Triaclymenia Schindewolf, 1937Family Wocklumeriidae Schindewolf, 1937Genus Epiwocklumeria Schindewolf, 1937Genus Kielcensia Czarnocki, 1989Genus Synwocklumeria Librovitch, 1957Genus Wocklumeria Wedekind, 1918Suborder Cyrtoclymeniina Korn, 2002Superfamily Biloclymeniaceae Bogoslovsky, 1955Family Biloclymeniidae Bogoslovsky, 1955Genus Biloclymenia Schindewolf, 1923Genus Dimeroclymenia Czarnocki, 1989Genus Kiaclymenia Bogoslovsky, 1965Genus Rhiphaeoclymenia Bogoslovsky, 1965Family Pachyclymeniidae Korn, 1992Genus Pachyclymenia Schindewolf, 1937Genus Uraloclymenia Bogoslovsky, 1977Superfamily Cyrtoclymeniaceae Hyatt, 1884Family Carinoclymeniidae Bogoslovsky, 1975Genus Acriclymenia Bogoslovsky, 1975Genus Carinoclymenia Bogoslovsky, 1965Genus Karaclymenia Bogoslovsky, 1983Genus Pinacoclymenia Bogoslovsky, 1975Family Cymaclymeniidae Hyatt 1884Subfamily Cymaclymeniinae Hyatt, 1884Genus Cymaclymenia Sepkoski, Jr., 2002Genus Laganoclymenia Bogoslovsky, 1979Genus Procymaclymenia Korn, 2002Genus Rodachia Korn, 2002Subfamily Genuclymeniinae Korn, 2002Genus Flexiclymenia Czarnocki, 1989Genus Genuclymenia Wedekind, 1908Genus Siekluckia Czarnocki, 1989Family Cyrtoclymeniidae Hyatt, 1884Genus Cyrtoclymenia Sepkoski, Jr., 2002Genus Hexaclymenia Schindewolf, 1923Genus Praeflexiclymenia Czarnocki, 1989Genus Pricella Korn, 1991Genus Protactoclymenia Wedekind, 1908Family Rectoclymeniidae Schindewolf, 1923Genus Cteroclymenia Bogoslovsky, 1979Genus Falciclymenia Schindewolf, 1923Genus Karadzharia Korn, 2002Genus Rectoclymenia Wedekind, 1908Suborder Incertae sedisGenus BorkiniaGenus GyroclymeniaGenus KazakhoclymeniaGenus MiroclymeniaGenus Schizoclymenia