Morphology and arrangement of meromes in Ischadites dixonensis, an Ordovician Receptaculitid

Title Variants

Alternative: Meromes in Ischadites

Related Titles

Series: Fieldiana, Geology, v. 39, no. 2

Series: Publication (Field Museum of Natural History), 1283

By

Fisher, Daniel C.

Nitecki, Matthew H. , joint author

Type

Book

Material

Published material

Publication info

Chicago, Field Museum of Natural History, 1978

Notes

Caption title.

"May 26, 1978."

Ischadites dixonensis (Miller and Gurley, 1896), from the Ordovician Galena Group of Illinois, is the oldest described North American ischaditid. The holotype is exceptionally well preserved and provides information on merome head morphology, articulation, and arrangement on the surface of the thallus. Meromes occur in whorls and form an equal number of dextral and sinistral parastichies. Each parastichy begins either at one of the heads surrounding the basal pole or at a triangulum, and extends to the margin of a clearly demarcated apical lacuna. The unusually complete morphological characterization that is now available for I. dixonensis will play an important role in discussions of receptaculitid morphogenesis and orientation.

Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-).

Subjects

Illinois , Ischadites dixenensis , Ordovician , Paleobotany

Language

English

Identifiers

DOI: https://doi.org/10.5962/bhl.title.3293
LCCN: https://lccn.loc.gov/78050557
OCLC: 4082028
Wikidata: https://www.wikidata.org/entity/Q51506870