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Temporal range: late Early Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Orthocerida
Family: Troedssonellidae
Genus: Glenisteroceras
Flower, 1957

Glenesteroceras, which is of questionable validity[citation needed], is based on a single specimen from the Lower Ordovician of New York state, described by Rousseau Flower, 1957.

Glenestoceras is described as being a weakly annulate orthocone with a circular cross section and large central siphuncle with slightly divergent necks, thick connecting rings, and expanded segments. Description is based on an incomplete immature phragmocone with a 5mm cross section.


  • Walter A Sweet, 1964. Nautiloidea - Orthocerida, Treatise on Invertebrate Paleontology, Part K, incl Nautiloidea. Geological Society of America and University of Kansas Press.