Molecular Phylogeny of Common Cibicidids and Related Rotaliida (Foraminifera) Based on Small Subunit Rdna Sequences

Abstract

To infer the phylogenetic relationships of cibicidids, we obtained small subunit ribosomal DNA (SSU rDNA) sequences of six common cibicidid morphospecies. In view of our results, the placement of cibicidids in different superfamilies, the distinction between planoconvex Cibicides and biconvex Cibicidoides, and the erection of genera such as Fontbotia and Lobatula are unjustified. Moreover, the superfamily Planorbulinacea, in which cibicidids are often placed, is polyphyletic and coiling mode cannot be used as a major taxonomic criterion. Our data suggest that all cibicidids examined here could be classified in one unique family, the Cibicididae, that includes Melonis, Hanzawaia,

Deglacial carbon cycle changes observed in a compilation of 127 benthic <i>δ</i><sup>13</sup>C time series (20–6 ka)

“…Measurements of δ 13 C from the calcite tests of epibenthic foraminifera Cibicides wuellerstorfi and related species (Schweizer et al, 2009) are commonly used to trace the spatial distribution of nutrients and deep water masses as well as changes in ocean carbon cycling (e.g., Curry et al, 1988;Duplessy et al, 1988;Curry and Oppo, 2005;Schmittner et al, 2017). Benthic δ 13 C is also slightly influenced (< 15 %) by changes in carbonate ion concentration of sea water .…”

The Paleocene–Eocene Thermal Maximum at DSDP Site 277, Campbell Plateau, southern Pacific Ocean

“…For the δ 18 O values of Cibicides (i.e. Cibicidoides; see Schweizer et al, 2009) and Stensioina, we apply an isotopic correction factor of +0.28 ‰ (Katz et al, 2003). Paleotemperatures for both benthic and planktic taxa were calculated from δ 18 O using the equation of Kim and O'Neil (1997): Zachos et al, 1994), assuming ice-free conditions for the Paleocene-Eocene transition.…”

Neogene Benthic Foraminifera from the southern Bering Sea (IODP Expedition 323)

“…Revets (1996). This species is assigned to the genus Cibicidoides in this study following the results of molecular phyogenetic studies by Schweizer (2006) and Schweizer et al (2009Schweizer et al ( , 2011.…”