A paedomorphic dwarf species, Gauthieria pumilio sp. nov. (Echinoidea: Phymosomatidae), from the Campanian (Late Cretaceous) of Hannover, Germany: A paedomorphic dwarf species, Gauthieria pumilio sp. nov

A new phymosomatoid species, Gauthieria pumilio sp. nov., from lower Campanian (Late Cretaceous) deposits in the vicinity of Hannover, Germany, is described. This species is very close in its overall appearance (i.e. tuberculation and ambulacral plating pattern) to a few other species: Gauthieria ra...

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Bibliographic Details
Published in:Paläontologische Zeitschrift 2024, Vol.98 (4), p.593-601
Main Author: Schlüter, Nils
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Paleontology
Research Paper
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Summary:A new phymosomatoid species, Gauthieria pumilio sp. nov., from lower Campanian (Late Cretaceous) deposits in the vicinity of Hannover, Germany, is described. This species is very close in its overall appearance (i.e. tuberculation and ambulacral plating pattern) to a few other species: Gauthieria radiata and the juvenile stages of the Santonian Gauthieria spatulifera and the Maastrichtian Gauthieria princeps , with which Gauthieria pumilio sp. nov. is accordingly closely related. However, it deviates from its relatives by a significantly smaller test diameter. Accordingly it is deviating from the general increase in size during the evolutionary lineage leading from the Turonian G. radiata via G. spatulifera to the Maastrichtian G. princeps. This lineage exemplified Cope's Rule through increasing test size. However, G. pumilio sp. nov. challenges this pattern with its dwarfing phenomenon, exhibiting a test diameter 
ISSN:0031-0220
1867-6812
DOI:10.1007/s12542-024-00702-z