The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda
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Abstract
Knightoconus, a new genus of the Hypseloconidae (Mollusca: Monoplacophora) from rocks of early Franconian age in Antarctica, is multiseptate. The multiple septa are a criticàl feature to be expected in a form ancestral to cephalopods. Fossil cephalopods, however, invariably have a siphuncle as well as septa; some gastropods, some hyolithids, and some monoplacophorans also have septa but lack a siphuncle. Therefore, only the siphuncle can be considered a unique and particularly significant feature of the cephalopod shell. Hypothetical reconstructions of molluscan anatomy support the notion that cephalopods may have been derived directly from a hypseloconid having a high, slightly curved, multiseptate, bilaterally symmetrical shell, by the subsequent development of a siphuncle.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda |
| Series title | Lethaia |
| DOI | 10.1111/j.1502-3931.1973.tb01199.x |
| Volume | 6 |
| Issue | 3 |
| Year Published | 1973 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 35 p. |
| First page | 275 |
| Last page | 309 |
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