Clavatipollenites (Walker and Walker, 1984) COUPER
publication ID |
https://doi.org/ 10.37520/fi.2022.016 |
DOI |
https://doi.org/10.5281/zenodo.13917132 |
persistent identifier |
https://treatment.plazi.org/id/03FD87F2-FFEB-FFF9-FCD6-F942C751F919 |
treatment provided by |
Felipe |
scientific name |
Clavatipollenites |
status |
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Stamens with Asteropollis- or Clavatipollenites - type pollen sp. 1
Text-fig. 16a–c View Text-fig
Description and remarks. The material consists of a single tetrasporangiate stamen with Asteropollisor Clavatipollenites - type pollen in situ ( Text-fig. 16a–c View Text-fig ). The filament is lacking, and the anther was probably sessile or almost sessile. The anther is elongate elliptical, about 1 mm long and 0.3 mm broad. None of the grains shows the aperture clearly exposed, which creates the uncertainty about their generic assignment, but the grains were probably monoaperturate. Pollen is circular in equatorial view, about 17–20 µm in diameter ( Text-fig. 16b View Text-fig ). The exine is semitectate-reticulate with a homobrochate reticulum (Textfig. 16b, c). Lumina are irregular and up to about 0.9 µm in diameter. Muri are narrow, about 0.3 µm wide, ornamented with minute verrucae arranged in one row, or sometimes in two longitudinal rows, separated by a line of fine perforations ( Text-fig. 16c View Text-fig ). Columellae are short, about 0.4 µm, and widely spaced ( Text-fig. 16c View Text-fig ). Orbicules are tiny, spherical with a verrucate to spiny surface ornamentation ( Text-fig. 16c View Text-fig ).
Affinity and other occurrences. The pollen wall is closely similar to that of pollen in situ in Proencistemon portugallicus , and also pollen in situ in the unnamed stamens and inflorescence fragments with Clavatipollenites- and Asteropollis - type pollen. The pollen is typically chloranthoid, but is distinct from all other chloranthoid pollen from Catefica, as well as from chloranthoid pollen recorded from other mesofossil floras from Portugal, in the line of fine perforations on top of the muri. The distinctiveness of this feature would support the recognition of a separate species, but the lack of information on the aperture configuration precludes closer comparison with pollen of extant Chloranthaceae and also the relevant genera of fossil pollen.
Affinity |
Harvard University - Arnold Arboretum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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