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Elaterocolpites pentarhetus (elaterate)

Cycadopsida - Gnetales

Taxonomy
Elaterocolpites pentarhetus was named by Srivastava (1984). It is not extant. It is considered to be a form taxon.

Synonymy list
YearName and author
1984Elaterocolpites pentarhetus Srivastava

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RankNameAuthor
kingdomPlantae
subkingdomEmbryophyta
phylumCycadophytaBessey 1907
classCycadopsidaBrongniart 1843
RankNameAuthor
orderGnetalesFries 1891
genusElaterocolpitesJardiné and Magloire 1965
speciespentarhetus

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.

Diagnosis
ReferenceDiagnosis
S. K. Srivastava 1984Pollen pentacolpate, radiosymmetric with a body and five equatorial elaters; body ellipsoidal, prolate, polar areas somewhat flatly rounded, with five equatorial elaters and five colpi. Elaters five, long, bases broad, tapering towards apices, apices blunt and rounded; elaters are solid and made of sexine only. Colpi long, gaping, covered with the colpi-membrane which is an extension of the outer layer of the exine, each colpus situated between two elaters or at the base of each elater. Exine thin (1pm thick), compressed, pertectate, thickens (1.2 pm) in the areas where elaters arise, nexine very thin, more or less smooth, at x 5000, slight undulations visible, sexine two-layered, outer layer thin, thickens at the site of elaters, extends on colpi as a membrane; inner layer baculate, bacules short, reduced to granulose shape and size, height c. 0.4 pm, width c. 0.2 pm, larger in elater-bearing areas, absent in colpus-areas. Tectum in lower magnifications smooth, at x 3000 to x 5000 magnification finely punctate, randomly in certain areas, punctae diameter about 0.2 pm, exine surface on elaters smooth, except in corroded areas. Supratectal processes none.