Cyrtocycloceras urbanum, from Sweet (1964).

Belongs within: Michelinoceratida.

The Middle Silurian Paraphragmitidae were orthoconic or cyrtoconic orthocerid cephalopods with a distinctly annulated shell.

Characters (from Sweet 1964): Annulated orthocones, cyrtocones and brevicones; siphuncle empty, subcentral, suborthochoanitic.

    |--Paraphragmites Flower 1943 S64
    |    `--*P. ascoceroides Flower 1943 S64
    |--Calocyrtoceras Foerste 1936 S64
    |    `--*C. cognatum (Barrande 1866) [=Cyrtoceras cognatum] S64
    |--Cyrtocycloceras Foerste 1936 S64
    |    `--*C. urbanum (Barrande 1866) [=Cyrtoceras urbanum] S64
    |--Gaspocyrtoceras Foerste 1936 S64
    |    |--*G. cooperi Foerste 1936 S64
    |    `--G. telleri Foerste 1936 P68
    `--Lyecoceras Mutvei 1957 S64
         |--*L. gotlandense Mutvei 1957 S64
         `--L. longistriatum S64

*Type species of generic name indicated


[P68] Purnell, L. R. 1968. Catalog of the Type Specimens of Invertebrate Fossils. Part I: Paleozoic Cephalopoda. United States National Museum Bulletin 262: 1-198.

[S64] Sweet, W. C. 1964. Nautiloidea – Orthocerida. In Treatise on Invertebrate Paleontology pt. K. Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea (R. C. Moore, ed.) pp. K216-K261. The Geological Society of America and the University of Kansas Press.

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