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Cruciptera simsonii
Taxonomy
Tetrapteris simsonii was named by Brown (1940). It is a compression fossil. Its type locality is UCMP 3904, West Branch Creek, which is in an Eocene terrestrial siliciclastic in the Clarno Formation of Oregon.
It was recombined as Cruciptera simsonii by Manchester (1991).
It was recombined as Cruciptera simsonii by Manchester (1991).
Synonymy list
| Year | Name and author |
|---|---|
| 1940 | Tetrapteris simsonii Brown p. 352 |
| 1991 | Cruciptera simsonii Manchester |
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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.
†Cruciptera simsonii Brown 1940
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R.W. Brown 1940 | A 4-winged samara resembling a propeller, one of the wings of which is shorter and narrower than the other three. Venation of the wings subparallel to flaring near the apex. | |
| S. R. Manchester 1991 | Samaras typically with 4 elongate wings radiating in a plane surrounding a globose nutlet; diameter of fruits including wings 22.0-41.5 mm. Pedicel thin (ca.0.4 mm), up to 6 mm long, aligned with the axis of symmetry. Wings free from one another, attached in a plane about the equator of the nutlet; wings narrow, elongate (3 or more times longer than wide), spatulate to parallel sided, entire-margined, bluntly rounded to pointed at the apices, 11-17 mm long, 2.5-4.6 mm wide. Wing venation subparallel, somewhat spreading distally, without cross veins, occasionally anastamosing, 15-20 veins across at the widest point of the wing, veins terminating at the margin without forming loops. Nutlet smooth, globose except for a conical apical projection, 3.6-5.0 mm in equatorial diam.; 3.4-4.5 mm high. Four sepals arranged in a whorl an the apical 1/3 of the nutlet, sepals 2.0 mm long, 0.8 mm wide, with rounded apices, and in at least some specimens appear to alternate in position with the wings. A pair of long stylar arms arising from the apex of the nutlet, extending 3.2-4.3 mm, orientation of the stylar arms not evident. Nutlet unilocular; base of he locule divided into 4 lobes by thick primary and secondary septa. Secondary septum incomplete, extending ca.1/3 of the distance from base to apex of the fruit. Primary septum complete except for an aperture in the apical 1/3 of the nutlet, containing a pair of prominent vascular bundles. Nutshell 0.2-0.3 mm thick. Two lacunae situated near the periphery of the primary septum, more or less circular in cross section. Plane of dehiscence dividing the nutlet into 2 halves along the plane of the secondary septum. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||
Age range: base of the Ypresian to the top of the Middle Eocene or 56.00000 to 37.71000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ypresian | USA (Washington) | Cruciptera simsonii (147822) | |
| Middle Eocene | USA (Oregon) | Cruciptera simsonii (21220) Tetrapteris simsonii, Cruciptera simsonii (type locality: 31676) |