Worldwide morphological variability in mid-Pliocene menardellid globorotalids

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doi: 10.1016/j.marmicro.2015.09.001
Author(s): Mary, Yannick; Knappertsbusch, Michael
Author Affiliation(s): Primary:
Natural History Museum Basel, Basel, Switzerland
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, Vol.121, p.1-15. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. 84 refs.; illus., incl. 2 tables, sketch maps
Summary: Proper species concepts of planktonic foraminifera are essential for paleo-environmental studies. Although subtle but key differences indicate the existence of sibling species, the quantitative morphological variability of foraminifera tests remains still poorly documented. We present morphological analyses of over 7500 oriented specimens of the subgenus Menardella (globorotalid foraminifera) at a time-slice at 3.2 Ma (Mid-Pliocene). Size, frequency distribution and linear test measurements were collected with an automated device, the robot AMOR. We performed morphometric investigations in a total of 19 samples distributed worldwide. Among formally established menardellid morpho-species, eight different morphotypes are recognized. The geographic variation in morphotype abundance allows for the recognition of five menardellid provinces among the tropical Atlantic, Indian and Pacific Ocean. Results suggest that during the Mid-Pliocene, the formal morpho-species Globorotalia (Menardella) menardii is in fact composed of two distinct morphotypes, which differ in size range, morphological variability and biogeography. Morphological characterization of the morpho-species Globorotalia (M.) multicamerata reveals the occurrence of three distinct morphotypes, which may represent an adaptation to their vertical distribution in the water column. Abstract Copyright (2015) Elsevier, B.V.
Year of Publication: 2015
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Arabian Sea; Atlantic Ocean; Biogeography; Biometry; Cape Basin; Cape Verde Rise; Caribbean Sea; Carnegie Ridge; Ceara Rise; Cenozoic; Cocos Ridge; Colombian Basin; Coral Sea; DSDP Site 502; DSDP Site 503; DSDP Site 532; Deep Sea Drilling Project; East Pacific; Equatorial Atlantic; Equatorial Pacific; Exmouth Plateau; Foraminifera; Globigerinacea; Globorotalia; Globorotaliidae; IPOD; Indian Ocean; Integrated Ocean Drilling Program; Invertebrata; Lau Basin; Leg 108; Leg 115; Leg 117; Leg 121; Leg 122; Leg 130; Leg 133; Leg 135; Leg 138; Leg 154; Leg 165; Leg 166; Leg 175; Leg 184; Leg 202; Leg 68; Leg 75; Menardella; Microfossils; Middle Pliocene; Morphology; Nazca Ridge; Neogene; Ninetyeast Ridge; North Atlantic; North Pacific; Northeast Pacific; Northwest Pacific; ODP Site 1006; ODP Site 1082; ODP Site 1143; ODP Site 1148; ODP Site 1236; ODP Site 1238; ODP Site 1241; ODP Site 659; ODP Site 661; ODP Site 667; ODP Site 707; ODP Site 716; ODP Site 721; ODP Site 728; ODP Site 757; ODP Site 758; ODP Site 763; ODP Site 806; ODP Site 807; ODP Site 823; ODP Site 834; ODP Site 835; ODP Site 846; ODP Site 852; ODP Site 925; ODP Site 926; ODP Site 999; Ocean Drilling Program; Ontong Java Plateau; Pacific Ocean; Planktonic taxa; Pliocene; Populations; Protista; Rotaliina; Sierra Leone Rise; South Atlantic; South China Sea; South Pacific; Southeast Pacific; Southwest Pacific; Straits of Florida; Tertiary; Tests; Walvis Ridge; West Pacific
Coordinates: N040303 N040303 W0953813 W0953813
N001906 N033626 E1592142 E1563728
S073244 S073243 E0590101 E0590100
N092143 N092143 E1131707 E1131707
Record ID: 2016037620
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands