Gastonispermum antiquum

Name

Gastonispermum antiquum

Rank

Species

Generic Name

[Genus] Gastonispermum

Authors (Pub.)

Friis E. M. Crane P. R. Pedersen K. R.  

Publication

The Early Cretaceous mesofossil flora of Torres Vedras (NE of Forte da Forca), Portugal: a palaeofloristic analysis of an early angiosperm community [2019/11]

Journal

Fossil Imprint

Volume

75

Issue

2

Page number

175

Year

2019

Fossil Status

seeds

Stratigraphy

Barremian

Strat. comment

Lower member of the Almargem Formation

Location

Torres Vedras, NE of Forte de Forca, Portugal (39°06′13″ N, 9°14′47″ W).

Paleoregion

Eurasia (Europe)

Data for Holotypus

Repository

Naturhistoriska riksmuseet, Stockholm, Sweden

Repository Number

S136736

Num

Text-fig. 14b

Pub.

The Early Cretaceous mesofossil flora of Torres Vedras (NE of Forte da Forca), Portugal: a palaeofloristic analysis of an early angiosperm community [2019/11]

Data for Paratypus

Repository

Naturhistoriska riksmuseet, Stockholm, Sweden

Repository Number

S136737, S136738, S170085 (Torres Vedras sample 43); S136680, S136681, S174629 (Torres Vedras sample 298).

Diagnosis

Isolated seeds occurring singly. Seeds small, anatropous, bitegmic and exotestal. Seed surface smooth without longitudinal ridges. Course of raphe seen as a slightly raised rounded ridge. Hilum and micropyle separated by a narrow zone of sclerenchyma. Hilar scar small, slightly raised without a hilar rim. Micropyle formed by the inner integument (tegmen) and marked on the seed surface by a Y-shaped slit through the outer integument (testa) adjacent to the hilar scar. Exotesta of palisade-shaped sclerenchyma cells; mesotesta/endotesta of thin-walled parenchyma cells. Palisade-shaped cells of exotesta with evenly thickened anticlinal walls and a straight lumen. Anticlinal walls of palisade-shaped sclerenchyma strongly undulate toward the inside and toward the outside, resulting in stellate-undulate facets and a jigsaw puzzle-like pattern on the seed surface. Tegmen thin.