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Alkastrobus peltatus
Taxonomy
Alkastrobus peltatus was named by Del Fueyo and Archangelsky (2005) [Holotype. LIL Pb 2562 (Fig. 1E).]. It is considered to be a form taxon. Its type specimen is Pollen cones, an other (Pollen cones), and it is a 3D body fossil. Its type locality is Estancia La Magdalena, which is in an Aptian fluvial-lacustrine conglomerate/sandstone in the Anfiteatro de Ticó Formation of Argentina. It is the type species of Alkastrobus.
Synonymy list
| Year | Name and author |
|---|---|
| 2005 | Alkastrobus peltatus Del Fueyo and Archangelsky figs. Fig. 1 - 5 |
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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.
†Alkastrobus peltatus Del Fueyo and Archangelsky 2005
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. M. Del Fueyo and S. Archangelsky 2005 | Pollen cones cylindrical, elliptical, sessile, up to 10 mm long and 5 mm wide. Microsporophylls spirally arranged on a central axis 0.5 mm wide; peltate with a pedicel 0.9 mm long and a distal rhomboidal head of 1!1.2 mm. Abaxial to the head and parallel to the pedicel, more than six elongate pollen sacs are attached. Microsporophyll tissues consist of: epidermis of the sporophyll head; exothecium, one parietal layer and the peritapetal membrane of the microsporangium. Ubisch bodies present. Cyclusphaera Elsik pollen embedded in the peritapetal membrane, shape discoid, 50e 58 mm in diameter, two polar apertures and equatorial thickening present. Exine apparently laevigate under LM but showing granules and spines under SEM. Pollen wall with a sculptured sexine and a lamellate nexine; fully developed in the equatorial areas, thinning towards the apertures. Outer part of the sexine with loosely disposed granules that gradually fuse towards the nexine as irregularly aligned vermiform elements. Nexine composed of at least eight parallel, wavy lamellae. |
Measurements
No measurements are available
No ecological data are available