New data on the stratigraphic distribution of the nannofossil genus Catinaster and on evolutionary relationships among its species

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doi: 10.1144/jmpaleo2013-002
Author(s): Ciummelli, Marina; Raffi, Isabella
Author Affiliation(s): Primary:
Universita Gabriele d'Annunzio di Chieti-Pescara, Dipartimento di Ingegneria e Geologia, Chieti Scalo, Italy
Volume Title: Journal of Micropalaeontology
Source: Journal of Micropalaeontology, 32(2), p.197-205. Publisher: British Micropalaeontological Society, London, United Kingdom. ISSN: 0262-821X
Note: In English. 24 refs.; illus., incl. 1 plate, sketch map
Summary: Examination of Upper Miocene-Lower Pliocene sediments at IODP Site U1338, in the Eastern Equatorial Pacific, provided new data on the distribution range of the calcareous nannofossil genus Catinaster. In addition to the the well-known occurrence of Catinaster coalitus and Catinaster calyculus in the early Late Miocene, we document Catinaster mexicanus in both the mid-late Miocene and the Early Pliocene. We confirm its taxonomic validity, rejecting previous interpretations of Pliocene C. mexicanus specimens as the result of dissolution of Discoaster altus. Instead, the Pliocene appearance of C. mexicanus seems to originate from the D. altus lineage. The short interval of occurrence (c. 50 ka) in the Late Miocene may document a preliminary evolutionary emergence of C. mexicanus that lacks any relationship with the other Catinaster species. Clear ancestor species to validate its independent origin from Discoaster are, however, missing. In the stratigraphic intervals where Catinaster species are found, their co-occurrence with Discoaster species bearing a prominent star-shaped boss on one side is noteworthy. This suggests that Catinaster and Discoaster at times developed a common morphological feature (a stellate structure, with or without hexaradiate symmetry), possibly under recurrent changes in climatic/environmental conditions. The data presented on C. mexicanus suggest a wider geographical distribution than previously thought, extending from the tropical Pacific to the Gulf of Mexico, equatorial Atlantic and tropical Indian oceans.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 09 Paleontology, Paleobotany; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Biogeography; Biologic evolution; Biostratigraphy; Catinaster; Ceara Rise; Cenozoic; Discoaster; Discoasteridae; East Pacific; Equatorial Atlantic; Equatorial Pacific; Expedition 321; Expeditions 320/321; Guatemala Basin; IODP Site U1338; Integrated Ocean Drilling Program; Leg 138; Leg 154; Lower Pliocene; Microfossils; Miocene; Morphology; Nannofossils; Neogene; North Atlantic; North Pacific; Northeast Pacific; ODP Site 845; ODP Site 926; Ocean Drilling Program; Pacific Ocean; Plantae; Pliocene; Taxonomy; Tertiary; Upper Miocene
Coordinates: N093455 N093500 W0943522 W0943527
N034309 N034309 W0425430 W0425430
N023028 N023028 W1175811 W1175811
Record ID: 2013077588
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom