Early evolution of the Cretaceous serial planktic Foraminifera (late Albian-Cenomanian)

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doi: 10.2113/gsjfr.39.4.335
Author(s): Georgescu, Marius D.; Huber, Brian T.
Author Affiliation(s): Primary:
University of Calgary, Department of Geoscience, Calgary, AB, Canada
Other:
Smithsonian Institution National Museum of Natural History, United States
Volume Title: Journal of Foraminiferal Research
Source: Journal of Foraminiferal Research, 39(4), p.335-360. Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States. ISSN: 0096-1191 CODEN: JFARAH
Note: In English. Includes appendix. 85 refs.; illus., incl. 2 tables, 7 plates
Summary: The classification of the late Albian-Cenomanian biserial planktic foraminiferal family Heterohelicidae Cushman, 1927, is reevaluated. This group underwent a period of relatively slow evolutionary change during the late Albian-early Cenomanian followed by rapid evolution in the middle Cenomanian. Three new heterohelicid genera and species in the late Albian-early Turonian are described: Protoheterohelix obscura, Planoheterohelix postmoremani, and Globoheterohelix paraglobulosa. Two reassigned species are also emended: Protoheterohelix washitensis (Tappan) and Planoheterohelix moremani (Cushman). Reassessment of the taxonomic significance of morphological features of the heterohelicid test leads to the conclusion that the most important characters in their taxonomy are test architecture, symmetry/asymmetry of the periapertural structures, nature of periapertural structures, relative size difference of the proloculus and second chamber, test ornamentation, and pore size. Most heterohelicid taxa of the late Albian-Cenomanian display microperforate test walls. Heterohelix Ehrenberg, 1843, which evolved in the early Turonian, is a distinct lineage.
Year of Publication: 2009
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Albian; Atlantic Coastal Plain; Atlantic Ocean; Biologic evolution; Blake Nose; Blake Plateau; Caribbean Sea; Cenomanian; Cretaceous; DSDP Site 150; DSDP Site 463; DSDP Site 511; DSDP Site 95; Deep Sea Drilling Project; Foraminifera; Globigerinacea; Globoheterohelix paraglobulosa; Gulf of Mexico; Heterohelicidae; IPOD; Invertebrata; Leg 10; Leg 15; Leg 171B; Leg 174AX; Leg 62; Leg 71; Lower Cretaceous; Mesozoic; Microfossils; Mid-Pacific Mountains; Morphology; New taxa; North Atlantic; North Pacific; Northwest Pacific; ODP Site 1049; ODP Site 1050; ODP Site 1052; Ocean Drilling Program; Pacific Ocean; Planktonic taxa; Planoheterohelix postmoremani; Protista; Protoheterohelix obscura; Rotaliina; SEM data; South Atlantic; Taxonomy; United States; Upper Albian; Upper Cretaceous; Venezuelan Basin; West Pacific
Coordinates: N143041 N143041 W0692121 W0692121
S510017 S510017 W0465818 W0465818
N383000 N401500 W0740000 W0753500
N212101 N212101 E1744004 E1744004
Record ID: 2010007869
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research, Reference includes data from GeoScienceWorld, Alexandria, VA, United States