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Palliseria longwelli
Taxonomy
Mitrospira longwelli was named by Kirk (1930). Its type specimen is USNM 80840, a shell, and it is a 3D body fossil. Its type locality is Outcrops just west of summit on Alamo road south of Sheep Playa, which is in a Whiterockian carbonate limestone in the Antelope Valley Formation of Nevada. It is the type species of Mitrospira.
It was recombined as Palliseria longwelli by Runnegar (1981).
It was recombined as Palliseria longwelli by Runnegar (1981).
Synonymy list
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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.
†Palliseria longwelli Kirk 1930
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Diagnosis
Reference | Diagnosis | |
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E. Kirk 1930 | The genus as known is characterized by individuals of large size. The lower side of the shell is produced into a fairly high spire, while the upper side shows a wide umbilicus. The relative height of the spire is variable, due to greater or less overlap of the whorls on those preceding. The umbilicus is wide and open, the tubular cavity extending to the apex of the spire. The upper free margin of the whorls next the umbilicus is subangular. As shown by the growth lines and a fairly perfect aperture, this keel marks the apex of a deep reentrant notch. The keel is then considered the probable equivalent of the notch keel of the typical Pleurotomarids. An interesting feature of the genus is a progressive filling of the living chamber by secondary deposits of lime. This is noted in the description of the species and shows clearly in the section figured. The deposit is closely comparable with the secondary filling of the older camerae of certain cephalopods. |