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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. |
Measurements
No measurements are available
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Source: subo = suborder, o = order | |||||
References: Loeblich and Tappan 1984, Kiessling 2004 |
Age range: base of the Middle Turonian to the top of the Turonian or 93.50000 to 89.80000 Ma
Collections (12 total)
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Late/Upper Cenomanian - Late/Upper Turonian | Tanzania (Lindi) | H. helvetica (179874) | |
Turonian | United Kingdom | H. helvetica (57534 57535) | |
Early/Lower Turonian | Tanzania (Lindi) | H. helvetica (179875) | |
Early/Lower Turonian - Late/Upper Turonian | Tanzania (Lindi) | H. helvetica, H. praehelvetica (179314) | |
Early/Lower Turonian - Middle Turonian | Egypt | H. helvetica, H. praehelvetica (138419) H. praehelvetica (138418) | |
Early/Lower Turonian - Middle Turonian | Tanzania (Lindi) | H. helvetica (179313) H. helvetica, H. praehelvetica (179309 179312) H. praehelvetica (179882) | |
Middle Turonian | Poland | H. helvetica (97983) |