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Jensensispermum

Taxonomy

Species
J. redmondi (type species)

Synonymy list
YearName and author
1966Jensensispermum Chandler p. 151
1975Jensensispermum Blazer

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RankNameAuthor
kingdomPlantae
subkingdomEmbryophyta
RankNameAuthor
phylumCycadophytaBessey 1907
genusJensensispermum

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.

G. †Jensensispermum Chandler 1966
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Jensensispermum redmondi Chandler 1966
Diagnosis
ReferenceDiagnosis
M. E. J. Chandler 1966Infructescence and fruit (if any) unknown. Seeds subovoid to subglobular, germinating by splitting at micropylar end. Integument probably pulpy. Funicle passing from hilum to chalaza through shallow hilar cavity. Hilar scar at inner end of cavity, large, gibbous, at right angles to longer axis of seed. Chalaza large, occupying approximately half of the seed connected at one end with hilar scar, penetrating into endosperm but later retracting and releasing it. Endosperm occupying other half of seed, turgid, at first hemispherical, later sometimes becoming conical by contraction, bearing a median navel-like embryo-scar.
Measurements
No measurements are available
No ecological data are available

Age range: base of the Kimmeridgian to the top of the Tithonian or 157.30000 to 145.00000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Jurassic163.5 - 145.0USA (Wyoming) J. sp. (62561)
Kimmeridgian - Tithonian157.3 - 145.0USA (Colorado) J. redmondii (11611)
Kimmeridgian - Tithonian157.3 - 145.0USA (Utah) J. redmondi (221973)