Definition of Genus spirula
1. Noun. Genus of small cephalopods with many-chambered spiral shells resembling those of the extinct belemnites.
Group relationships: Family Spirulidae, Spirulidae
Member holonyms: Spirula, Spirula Peronii
Lexicographical Neighbors of Genus Spirula
Literary usage of Genus spirula
Below you will find example usage of this term as found in modern and/or classical literature:
1. A Conchological Manual by George Brettingham Sowerby (1852)
"The genus Spirula, also placed in this family, does not by any means agree with Lamarck's definitions, " the last whorl continuing in a straight line. ..."
2. The Genera of Recent Mollusca: Arranged According to Their Organization by Henry Adams, Arthur Adams (1858)
"Genus SPIRULA, Lamarck. Fins two, small, caudal, on the side of the extremity of the back. Eyes large. Cups of sessile arms in six longitudinal rows; ..."
3. The Animal Kingdom Arranged in Conformity with Its Organization by Georges Cuvier, Pierre André Latreille (1831)
"... but it has shorter arms—it forms the genus, SPIRULA, Lam. In the hind part of the body, which is that of a Sepia, is an interior shell, which, ..."
4. The Analyst: A Quarterly Journal of Science, Literature, Natural History by William Holl, Neville Wood, Edward Mammatt (1839)
"... but which seems, as far as can be told, to belong to this genus Spirula. Both are spiral shells, with the whorls of the spine not close to each other, ..."
5. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"... genus Spirula the internal skeleton (<•, fig. 3} has thn form of a calcareous and nacreous tube, coiled up into a flat spiral, the coils of which are ..."