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Current identification/main database link: Alicantina Soldan et al. 2018
Original Description
Description. Trochospiral test, with moderate coiling axis; equatorial periphery moderately elongate to subcircular and the internal spire tends to increase in height; peripheral margin broadly rounded; in spiral view 4–6 (rarely 7) globular chambers in the last whorl increase gradually in size as added; spiral sutures slightly curved to straight, depressed; in umbilical view chambers subtriangular with strongly depressed, straight sutures; umbilicus deep and medium sized, aperture wide generally intraumbilical, tending to extend extraumbilically; aperture a distinct low to moderately high arch.
Etymology:
Extra details from original publication
Discussion. The illustrations, even if only in one view, presented by Colom in 1954 to support the erection of Globigerina lozanoi cover the entire spectrum of the genus Alicantina. In particular, the morphotypes with 4–4½ chambers are close to the species A. prolata (Bolli), morphotypes with up to 6–7 chambers in last whorl typify Colom’s species lozanoi, while some drawings illustrate transitional forms in between the two. Colom (1954) described the species lozanoi as having a smooth surface, but it is finely reticulate in comparison with the associated muricate species Acarinina aspensis (see above). Colom’s specification anticipates Berggren et al. (2006a) description about the presence of a non-spinose, dutertrei-type, irregularly cancellate wall texture in the new genus Alicantina. There are discrete evolutionary changes in the Alicantina lineage: increase in the total number of chambers of the last whorl (4–6) and in the umbilical diameter as well as the tendency to increase the height of the spire (Fig. 9.8). Alicantina prolata appears in Zone E4 and gave rise to Alicantina lozanoi in the early Eocene.
Phylogenetic relationship. Blow (1979) recognized that the origin of the lozanoi group is unknown. In addition, this author suggested that the taxon lozanoi gave rise to Guembelitriodes nuttalli ( = Globigerinoides higginsi) by increasing the spire height but Berggren et al. (2006a) demonstrated through detailed SEM images that the latter belongs to a different lineage as it displays a spinose wall texture. Alicantina n. gen. evolved in the early Eocene presumably from a parasubbotinid-like taxon possessing a non-spinose wall texture and left no descendants.
Stratigraphic range. Upper part of Zone E4 (mid early Eocene) to Zone E10 (middle Eocene).
Geographic distribution. Cosmopolitan, common in mid to low latitudes (see Fig. 1).
Editors' Notes
Colom, G. (1954). Estudio de las biozonas con foraminiferos del Terciario de Alicante. Boletin del Instituto Geologico y Minero de Espana. 66: 1-279. gs Soldan, D., Petrizzo, M. R. & Premoli Silva, I. (2018). Alicantina, a new Eocene planktonic foraminiferal genus for the lozanoi group. Journal of Foraminiferal Research. 38(1): 41-52. gsReferences:
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Alicantina compiled by the pforams@mikrotax project team viewed: 10-12-2023
Short stable page link: https://mikrotax.org/pforams/index.php?id=132674 Go to Archive.is to create a permanent copy of this page - citation notes |
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