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Follicucullus
An aberrant bi-apical Follicucullus (Albaillellaria) from the late Guadalupian (Middle Permian), with the possible oldest evidence of double malformation in radiolarians
Phylogenetic model of Follicucullus lineages (Albaillellaria, Radiolaria) based on high-resolution biostratigraphy of the Permian Bancheng Formation, Guangxi, South China
Follicucullus, new radiolarian genus from the Guadalupian (Permian) Lamar Limestone of the Delaware Basin
figures 1–21. Guadalupian radiolarians from the Xiaodong town, south Guang...
Measurements of shell sizes of bi-apical Follicucullus specimen and Foll...
figures 1–26. Guadalupian radiolarians from the Xiaodong Town, southern Gu...
Prior models of the “ Follicucullus ” lineages recognized in Follicucullida...
Bi-apical Follicucullus from a chert block (sample IT15102608) at Awano, ...
Composite stratigraphic range and deduced phylogeny of Follicucullus spec...
FIGURE 2. Graphic log showing lithology, percent Follicucullus and radiol...
Verifiability of genus-level classification under quantification and parsimony theories: a case study of follicucullid radiolarians
Abstract: The Permian Period is one of the most varied times, not only in oceanic environments, but also for the evolution of the radiolarian assemblages. Permian radiolarians have been extensively studied, and great progress has been achieved recently in their biostratigraphy. Seventeen Permian radiolarian zones are summarized here. Among these, seven zones are assigned to the latest Carboniferous–early Permian, namely (in ascending order): the Pseudoalbaillella bulbosa Assemblage Zone, the Pseudoalbaillella u-forma – Pseudoalbaillella elegans Assemblage Zone, the Pseudoalbaillella lomentaria – Pseudoalbaillella sakmarensis Assemblage Zone, the Pseudoalbaillella rhombothoracata Interval Zone, the Albaillella xiaodongensis Assemblage Zone, the Albaillella sinuata Abundance Zone and the Pseudoalbaillella ishigai Abundance Zone. Five zones are attributed to the middle Permian, including the Pseudoalbaillella globosa Interval Zone, the Follicucullus monacanthus Interval Zone, the Follicucullus porrectus Interval Zone, the Follicucullus scholasticus Interval Zone and the Follicucullus charveti Interval Zone. Five zones belong to the middle Permian–late Permian, including the Albaillella cavitata Interval Zone, the Albaillella levis Interval Zone, the Albaillella excelsa Interval Zone, the Albaillella triangularis Interval Zone and the Albaillella yaoi Abundance Zone. These Permian radiolarian biozones and their correlations with conondont zones or other chronostratigraphic schemes are discussed. The phylogenetic model of radiolarians through the Permian Period is also revised.