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Helvetoglobotruncana
Taxonomy
Helvetoglobotruncana was named by Reiss (1957). It was considered unknown by Loeblich and Tappan (1988).
It was assigned to Helvetoglobotruncaninae by Reiss (1957) and Loeblich and Tappan (1988).
It was assigned to Helvetoglobotruncaninae by Reiss (1957) and Loeblich and Tappan (1988).
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Helvetoglobotruncana Reiss |
| 1988 | Helvetoglobotruncana Loeblich and Tappan |
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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.
G. †Helvetoglobotruncana Reiss 1957
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Loeblich and H. Tappan 1988 | Test flatly trochospiral; chambers globular, slightly to strongly flattened on the dorsal side; keel dorsal, not necessarily peripheral (sub-peripheral keel) at the margin of the flattened part of the chamber-wall with r dorso-septal branches and never dichotomic; keels granular to subspinose; cameral aperture umbilical, extending slightly into a partly interiomarginal position; labial apertures interiomarginal-umbilical-sutural (latter part often reduced through partial fusion of the lips); lips very slightly, if at all arched lengthwise, covering partly the umbilical cavity. |