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Retrophyllum spiralifolium

Coniferales - Podocarpaceae

Taxonomy
Retrophyllum spiralifolium was named by Wilf et al. (2017). It is considered to be a form taxon. Its type specimen is MPEF-Pb 8911, a multi organs (Sterile axis, cuticle, leaves, fertile axis), and it is a compression fossil.

Synonymy list
YearName and author
2017Retrophyllum spiralifolium Wilf et al. p. 7 figs. 32-47

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RankNameAuthor
kingdomPlantae
phylumSpermatophyta
phylumPinophyta
orderConiferales
RankNameAuthor
familyPodocarpaceaeEndlicher 1847
genusRetrophyllumPage 1989
speciesspiralifolium

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.

†Retrophyllum spiralifolium Wilf et al. 2017
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Diagnosis
ReferenceDiagnosis
P. Wilf et al. 2017Foliage with conspicuous central longitudinalband of thickened tissue and obscure midvein not separating rowsof stomata. Lateral resin canals present. Principal leaves decurrentand extensively clasping twig, free portions either distichous and pectinate, with full heterofacial flattening, or spirally deployed withnegligible to slight basal twisting, frequently broken off to leave spi-rally arranged stubs of clasping portions. Leaf apices acuminate tomarkedly acuminate. Terminal bud protected by reduced, modifiedleaves. Reduced foliage also including ovoid and narrow forms onseparate shoot segments and narrow miniature leaves abruptly orgradually interspersed with principal leaves along shoots. Pollencones pedicellate, long-cylindrical, in axils of narrow reducedleaves, distichously grouped on a common peduncle.
Measurements
No measurements are available
No ecological data are available

Age range: base of the Ypresian to the top of the Lutetian or 56.00000 to 41.03000 Ma

Collections (9 total)


Time interval Ma Country or state Original ID and collection number
Ypresian56.0 - 48.07Argentina (Chubut) Podocarpaceae TY008 (133045 133046 133055 133056 133063 133064) Podocarpaceae TY008, Podocarpaceae TY176 (133047) Podocarpaceae TY176 (133054)
Lutetian48.07 - 41.03Argentina (Rio Negro) Retrophyllum spiralifolium (157776)