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Sagenopteris trapialensis
Sagenopteris trapialensis Elgor., Escapa, Cúneo J. Syst. Palaeontol., 2019, (10.1080/14772019.2018.1535456): 3. 24 Jan 2019
- Name
- Sagenopteris trapialensis
- Rank
- Species
- Generic Name
- [Genus] Sagenopteris
- Authors (Pub.)
- Elgorriaga A.
Escapa I. H.
Cúneo N. R.
- Publication
- Southern Hemisphere Caytoniales: vegetative and reproductive remains from the Lonco Trapial Formation (Lower Jurassic), Patagonia [2019/1]
- Journal
- Journal of Systematic Palaeontology
- Annee/Jahrgang
- 2019
- Issue
- 10.1080/14772019.2018.1535456
- Page number
- 3
- Year
- 2019
- Fossil Status
- foliage
- Stratigraphy
- Lower Jurassic
- Strat. comment
- Lonco Trapial Formation: Pliensbachian–Toarcian
- Location
- Taquetrén B locality, Chubut Province, Patagonia
- Paleoregion
- Gondwana (S America)
Data for Holotypus
- Repository
- Museo Paleontologico Egidio Feruglio, Trelew, Argentina
- Repository Number
- MPEF-Pb 2713a, b (Taquetrén B)
Data for Paratypus
- Repository
- Museo Paleontologico Egidio Feruglio, Trelew, Argentina
- Repository Number
- MPEF-Pb 1864, 2034 (Taquetrén A) and
MPEF-Pb 2854, 2855, 2877, 6608, 6623, 9506–9508,
9510–9512, 9514–9518, 9541 (Taquetrén B)
- Diagnosis
- Compound petiolate leaves bearing four leaflets,
up to 58mm long and 18mm wide, with an average
length/width (L/W) ratio of 2.5:1. The central pair
of leaflets is nearly symmetrical, elliptic to obovate,
emerging at 20–45; the lateral pair is smaller, asymmetrical,
oblong to ovate, with an emergence angle of
75–90. Both types of leaflets have rounded apexes,
straight to slightly undulate margins, occasionally with
up to two lateral lobes. Petioles slender, with straight
margins gently tapering upwards. Leaflets with a strong
midrib, visible up to three- to four-fifths of leaflet
length. Secondary veins emerging from midrib at c.
9–19, dichotomizing and anastomosing frequently
forming obliquely oriented areolae with a L/W ratio of
8.5–11:1. Leaflets with anastomoses of Z, X, H and
compound types, dichotomies simple. Bud- and scalelike
leaves small, the former having a broad petiole with
curved margins, clasping base and leaflets with diffuse
venation; scale-like leaves with tapering upwards
petioles with a broad base.