Basic info | Taxonomic history | Classification | Included Taxa |
Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Jensensispermum
Taxonomy
Jensensispermum was named by Chandler (1966). Its type is Jensensispermum redmondi.
It was assigned to Cycadophyta by Chandler (1966) and Blazer (1975).
It was assigned to Cycadophyta by Chandler (1966) and Blazer (1975).
Species
J. redmondi (type species)
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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
Reference | Diagnosis | |
---|---|---|
M. E. J. Chandler 1966 | Infructescence 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 |
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Late/Upper Jurassic | USA (Wyoming) | J. sp. (62561) | |
Kimmeridgian - Tithonian | USA (Colorado) | J. redmondii (11611) | |
Kimmeridgian - Tithonian | USA (Utah) | J. redmondi (221973) |