Cretaceous evolution of the genus Adercotryma (Foraminifera) in the deep Pacific

Author(s): Alegret, Laia; Thomas, Ellen
Author Affiliation(s): Primary:
Universidad de Zaragoza, Departamento de Ciencias de la Tierra (Paleontología), Saragossa, Spain
Yale University, United States
Volume Title: Micropaleontology
Source: Micropaleontology, 55(1), p.49-60. Publisher: American Museum of Natural History, New York, NY, United States. ISSN: 0026-2803 CODEN: MCPLAI
Note: In English. NSF Grant OCE-720049. 62 refs.; illus., incl. 3 plates, sketch map
Summary: Adercotryma glomeratum is one of the most geographically and bathymetrically widespread species of recent deep-sea benthic foraminifera, but the evolutionary history of this distinct agglutinated species is poorly known. In addition to one or two recent species probably closely related to A. glomeratum, the Eocene-Oligocene species Adercotryma agterbergi has been described, but we suggest that this species be assigned to the genus Ammogloborotalia. A very rare, unnamed species has been described from the Campanian in the western Pacific Ocean, and it has been speculated that the genus originated at about that time in the western Pacific, possibly from the ancester Ammogloborotalia gyroidinaeformis. We describe the Maastrichtian occurrence of a previously unknown species, which we named Adercotryma kuhnti. This species occurs in the Maastrichtian Abathomphalus mayaroensis planktonic foraminiferal Zone, Micula prinsii nannofossil zone CC26, in the lower bathyal to abyssal ODP Site 1210 (DP Leg 198, Shatsky Rise, northwest Pacific Ocean), where it constitutes up to 14.7% of the benethic foraminiferal assemblages. We looked for the species in coeval material from many locations in and around the Atlantic Ocean, and DSDP Site 465 in the Pacific (Hess Rise), but did not find it. The occurrence as a geographically restricted species agrees with speculation of a Cretaceous origin of the genus in the western Pacific, and evolution as a deep-sea species rather than migration from shallow waters.
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; Adercotryma kuhnti; Ammosphaeroidinidae; Atlantic Ocean; Cretaceous; DSDP Site 129; DSDP Site 196; DSDP Site 198; DSDP Site 465; Deep Sea Drilling Project; East Mediterranean; Foraminifera; Haplophragmiacea; Hess Rise; IPOD; Invertebrata; Leg 113; Leg 13; Leg 198; Leg 20; Leg 208; Leg 62; Maestrichtian; Maud Rise; Mediterranean Sea; Mesozoic; Microfossils; Morphology; New taxa; North Pacific; Northwest Pacific; ODP Site 1210; ODP Site 1262; ODP Site 690; Ocean Drilling Program; Pacific Ocean; Protista; SEM data; Senonian; Shatsky Rise; South Atlantic; Southern Ocean; Strabo Trench; Taxonomy; Upper Cretaceous; Walvis Ridge; Weddell Sea; West Pacific
Coordinates: N321300 N321300 E1581600 E1581600
N334914 N334914 E1785508 E1785508
N300832 N300832 W0760644 W0760644
S650938 S650937 E0011218 E0011218
Record ID: 2010025516
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