Catalog - Globigerina siakensis Catalog - Globigerina siakensis

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina siakensis LeRoy 1939

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: pf_cat -> G -> Globigerina -> Globigerina siakensis
Other pages this level: << < G. rugosa, G. rustica, G. sabina, G. sacculifera, G. sakitoensis, G. sallentina, G. santamariaensis, G. sastrii, G. scabrosa, G. scalena, G. schachdagica, G. scobinata, G. seminolensis, G. seminulina, G. semivera, G. siakensis, G. simulans, G. siphonifera, G. soldadoensis, G. soldadoensis angulosa, G. spinuloinflata, G. spiralis, G. spirata, G. stainforthi, G. stainforthi Hofker, G. steiningeri, G. stonei, G. subcorpulenta, G. subcretacea, G. subcretacea Chapman, G. subdigitata> >>

Globigerina siakensis

Citation: Globigerina siakensis LeRoy 1939
taxonomic rank: species
Type specimens: No. P. S. 1075 a.
Type sample (& lithostrat): Transitional Zone Sand and Clay Series
Type age (chronostrat): Neogene, Miocene (?)
Type locality: Locality Ho-528, 5 km. N. 33° E. from kampong Aliantan, Tapoeng Kiri area, Rokan-Tapanoeli Region (approximately between north latitudes 0° 30' and 1°50' and east longitudes 99°40' and 101°30' ), Central Sumatra, Netherlands Indies; auger hole sample, depth 3 meters
Type repository: Bandung; Deposited in the collections of the Geological Museum at Bandoeag, Java;

Current identification/main database link: Paragloborotalia siakensis (LeRoy, 1939)

Original Description

Test medium, periphery well rounded, strongly lobulate, closely coiled in early stage, dorsally rather flat but more convex ventrally; chambers distinct, five to six in last whorl, inflated, particularly last two or three, arranged in a flattened spiral fashion; sutures distinct, depressed, straight, radial both ventrally and dorsally; aperture a large opening at base of last chamber, opens ventrally and extends into umbilical region, a distinct lip projects from the upper part.

Diameter 0.4 mm.; thickness 0.28 mm.

Extra details from original publication
This species is present in great abundance throughout the Central Sumatran Tertiary. It is well developed in the Telisa


Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

Leckie, R. M. et al. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Paragloborotalia and Parasubbotina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 5): 125-178. gs

LeRoy, L. W. (1939). Some small foraminifera ostracoda and otoliths from the Neogene (Miocene) of the Rokan-Tapanoeli area, central Sumatra,. Natuurkunde Tijdschrift voor Nederlandsch-Indië. 99(6): 215-296. gs


Globigerina siakensis compiled by the pforams@mikrotax project team viewed: 2-3-2024

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