Dowlingoceras gracile, with cross-section, from Sweet (1964).

Belongs within: Oncoceratidae.

The Diestoceratidae were a family of cyrtoconic oncocerids from the Middle to Upper Ordovician with a characteristic cross-section.

Characters (from Sweet 1964): Compressed, straight to slightly endogastric brevicones. Siphuncle marginal, cyrtochoanitic with discrete, irregular actinosiphonate deposits.

    |--Danoceras Troedsson 1926 [incl. Hyperoceras Foerste 1928] S64
    |    `--*D. ravni Troedsson 1926 S64
    |--Dowlingoceras Foerste 1928 S64
    |    `--*D. gracile (Whiteaves 1892) [=Poterioceras gracile] S64
    |--Lyckholmoceras Teichert 1930 S64
    |    `--*L. estoniae Teichert 1930 S64
    |--Suttonoceras Miller & Youngquist 1947 S64
    |    `--*S. rossorum Miller & Youngquist 1947 S64
    `--Diestoceras Foerste 1924 S64
         |--*D. indianense (Miller & Faber 1894) [=Gomphoceras indianense] S64
         |--D. curtum Foerste 1935 P68
         |--D. fremontense Foerste 1935 P68
         |--D. kirki Foerste 1935 P68
         |--D. landerense P68
         |--D. magister Foerste 1935 P68
         |--D. occidentale Foerste 1935 P68
         |--D. schucherti Foerste 1928 P68
         |--D. shideleri Foerste 1924 P68
         `--D. walcotti Foerste 1935 P68

*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 – Oncocerida. In Treatise on Invertebrate Paleontology pt. K. Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea (R. C. Moore, ed.) pp. K277-K319. The Geological Society of America and the University of Kansas Press.

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