actinosiphonate
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English[edit]
Etymology[edit]
Adjective[edit]
actinosiphonate (not comparable)
- (paleontology) Having vertical lamellae on the siphuncle, hypothesized to be either outgrowths of the connecting ring, or the result of gerontic secretions.
- 1935 August 23, R. H. Flower, K. E. Caster, “The Stratigraphy and Paleontology of Northwestern Pennsylvania. Part II: Paleontology. Section A: The Cephalopod Fauna of the Conewango Series of the Upper Devonian in New York and Pennsylvania”, in Bulletins of American Paleontology, volume 22, number 75, Ithaca, NY, page 225:
- Cyrtochoanitic orthoceracones or slightly curved cyrtoceracones in which the septal necks are longer than the brims, and in which the connecting ring does not attain the adoral septum. Deposits within the siphuncle, if present, limited to a continuous lamellose lining, exhibiting neither actinosiphonate nor annulosiphonate structure.