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Acer stonebergae
Taxonomy
Acer stonebergae was named by Wolfe and Tanai (1987). Its type specimen is PDMA 19840MC 1001, a seed/fruit (Samara), and it is a compression fossil. Its type locality is One Mile Creek, north of Princeton, which is in a Ypresian lacustrine horizon in the Allenby Formation of Canada.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Acer stonebergae Wolfe and Tanai |
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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.
†Acer stonebergae Wolfe and Tanai 1987
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Wolfe and T. Tanai 1987 | Fruits samaroid; nutlet at basal end; nutlet 1.2 cm long, 0,6 to 0.8 cm wide, oval, slightly inflated; nutlet with indistinct flanges and a coarse reticulum of veins: attachment angle 20° to 30°, nutlet angle 10° to 20°; veins on nutlet obscure; proximal margin of nutlet either not or only slightly expanded beyond proximal margin of wing. Wing 4.0 cm long, 1.4 cm wide; proximal margin curved, distal margin broadly convex;
proximal margin with 10 prominent veins that originate equally spaced along apical margin of nutlet; wing veins diverging from proximal margin at angles of 30° to 50°, dichotomizing 2 to 4 times, few anastomoses or vein lets. |