Life association of shell and operculum of Middle Ordovician gastropod Maclurites

Citation
Dm. Rohr et El. Yochelson, Life association of shell and operculum of Middle Ordovician gastropod Maclurites, J PALEONTOL, 73(6), 1999, pp. 1078-1080
Citations number
17
Categorie Soggetti
Earth Sciences
Journal title
JOURNAL OF PALEONTOLOGY
ISSN journal
00223360 → ACNP
Volume
73
Issue
6
Year of publication
1999
Pages
1078 - 1080
Database
ISI
SICI code
0022-3360(199911)73:6<1078:LAOSAO>2.0.ZU;2-B
Abstract
The only two known life associations of the shelf and operculum of Maclurit es Le Sueur, 1818, are described for the first time, Maclurites cf. magnus Le Sueur, 1818, from the Middle Ordovician of Alaska demonstrates that the operculum fits slightly inside the aperture, and when closed, the operculum extends down below the base of the shell and may have acted as an anchor. The operculum of Maclurites bigsbyi (Hall, 1861), from the Middle Ordovicia n of Wisconsin, is illustrated for the first time and is confirmed to be di stinct from Maclurina logani (Salter, 1859).