Title
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
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