Unlocking the biomineralization style and affinity of Paleozoic fusulinid foraminifera - PubMed (original) (raw)

Unlocking the biomineralization style and affinity of Paleozoic fusulinid foraminifera

Zofia Dubicka et al. Sci Rep. 2017.

Abstract

Fusulinids are the most diverse, abundant and geographically widespread Paleozoic foraminifera which are widely considered to possess a "homogeneously microgranular" test microstructure composed of subangular grains of several micrometers in size. However, this texture appears to be a diagenetic artifact. Here we describe well-preserved Devonian calcareous fusulinids (Nanicella) from the Holy Cross Mountains (HCM) in central Poland. Foraminifera from Poland in which the primary nature of tests have not been masked by diagenesis are composed of low magnesium calcite spherical grains up to about 100 nanometers in diameter, identical to those observed in Recent and fossil hyaline foraminifera (Rotaliida, Globothalamea). These data call the paradigm of microgranular test microstructure of Foraminifera into question, and suggest a possible phylogenetic relationship between globothalamids and some fusulinids.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Figure 1

FESEM images (a–e) illustrating wall structure details in nanoscale of Recent Cibicides (b,d), Cretaceous Pseudouvigerina (e) and Devonian Nanicella (a,c). Optical microscopy (f,h) and cathodoluminescence images (g,i) of Recent Cibicides (h,i) and well-preserved Devonian Nanicella (f,g).

Figure 2

SEM images illustrating wall structure details in microscale of Recent Nodosaria (Lagenida) (a), Triloculina (Miliolida) (b) and Cibicides (Rotaliida) (d) as well as Devonian Nanicella (c).

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Unlocking the biomineralization style and affinity of Paleozoic fusulinid foraminifera - PubMed (original) (raw)