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Globanomalina australiformis
Taxonomy
Globorotalia australiformis was named by Jenkins (1966). It is not extant.
It was recombined as Planorotalites australiformis by Tjalsma (1977); it was recombined as Globanomalina australiformis by Olsson et al. (1999).
It was recombined as Planorotalites australiformis by Tjalsma (1977); it was recombined as Globanomalina australiformis by Olsson et al. (1999).
Synonymy list
| Year | Name and author |
|---|---|
| 1966 | Globorotalia australiformis Jenkins p. 1112 |
| 1977 | Planorotalites australiformis Tjalsma p. 500 |
| 1999 | Globanomalina australiformis Olsson et al. |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Globanomalina australiformis Jenkins 1966
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. G. Jenkins 1966 | Test free, sinistrally coiled, small, low trochospiral, biconvex, equatorial periphery quadrilobate; axial periphery rounded in the first 3 chambers of the final whorl, but angled with an incipient keel in the final chamber. Wall calcareous, finely perforate, surface smooth. Chambers compressed, 13 chambers in about 2!- whorls, with 5 chambers in the first whorl and 4 in the last, increasing fairly rapidly in size; proloculus diameter about 0'01 - 0'02 mm. Sutures recurved on spiral side and nearly radial on the umbilical side; slightly depressed on both sides. Umbilicus small, open. Aperture a low arch, interiomarginal, extraumbilical-umbilical. Maximum diameter 0'26 mm. | |
| R. Tjalsma 1977 | Globorotalia australiformis Jenkins, 1965. N.Z.J. Geol. Geophys., v. 8, p. 112, fig. 11, no. 92-96Our specimens match Jenkins' species except for the last chamber which lacks the incipient keel. Throughout its range at Site 329 it shows a morphologic intergradation into Planorotalites planoconica (Subbotina) to which it may be related (see Plate 2, Figures 5, 6). Typical specimens though have less chambers in the last whorl (4 in- stead of 5-5Vi), the chambers are more inflated than P. planoconica and the axial periphery is less acute (compare Plate 2, Figures 7-10 with Figures 1-3).
P. australiformis was reported from New Zealand to replace P. pseudomenardii in the upper Paleocene and to range well into the lower Eocene. At Site 329 it occurs frequently from the top of Section 3, Core 33 to the top of Core 32. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Loeblich and Tappan 1984, Kiessling 2004 | |||||
Collections
No collection or age range data are available