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.
Linked specimens: USNM-26782
Current identification/main database link: Hantkenina australis Finlay 1939
A fully satisfactory description of this species cannot yet be given, as no well preserved, unbroken examples have yet been found. Though it occurs at a number of localities, it is generally so rare and fragile that a composite description must be drawn up from a number of specimens. The genus is, however, of such interest and importance that the record is made in spite of this.
The species is best described by a comparison with H. alabamensis, the genotype, which it most nearly resembles. It has similarly compressed chambers but the sutural gutters are deeper and more marked. No examples have been seen with other than five chambers. The spine, as in alabamensis, is directly adjacent to the next suture (not as in mexicana and its allies quite distant from it); it is of about the same relative legth when unbroken (as long as or longer than the distance from its base to the umbilicus) but instead of being practically straight as in alabamensis, it usually has a decided backward curve. A notable difference is that the succeeding chamber begins at the base of the spine at the same level as the previous one and does not start some distance up the spine, as is usual in alabamensis. The aperture is similar to that figured by Cushman (1924, Proc. U. S. Nat. Mus., vol. 66, art. 30, p. 3) but is narrower and the basal wings are distinctly less spread, diverging at less than 90°, instead of considerably more.
Size: Paratype measures 0.6 mm. in diameter (without spines) and 0.3 mm. in thickness. The type will be figured later.
Extra details from original publication
Five damaged but uniform specimens were found showing some perfect spines and highly polished surface, minutely but distinctly perforate.
The Eocene species recorded from Mexico by Nuttall (1930) have little similarity to the New Zealand form, with the possible exception of H. longispina, but this has a little more open umbilicus, a lobulate periphery and a spine, though of similar length, not quite adjacent to the following suture.
Cushman, J.A., (1924). A new genus of Eocene foraminifera. Proceedings of the United States National Museum, 66(2567): 1-4. Finlay, H.J., (1939). New Zealand foraminifera: Key species in stratigraphy - no. 2. Transactions of the Royal Society of New Zealand, 69(1): 89-128. Nuttall, W.L.F., (1930). Eocene Foraminifera from Mexico. Journal of Paleontology, 4: 271-293.
Cushman, J.A., (1924). A new genus of Eocene foraminifera. Proceedings of the United States National Museum, 66(2567): 1-4.
Finlay, H.J., (1939). New Zealand foraminifera: Key species in stratigraphy - no. 2. Transactions of the Royal Society of New Zealand, 69(1): 89-128.
Nuttall, W.L.F., (1930). Eocene Foraminifera from Mexico. Journal of Paleontology, 4: 271-293.
Hantkenina australis compiled by the pforams@mikrotax project team viewed: 22-7-2018
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