Acitheca machadoi

Name

Acitheca machadoi

Rank

Species

Generic Name

[Genus] Acitheca

Authors (Pub.)

Correia P. Pereira S. Šimůnek Z. Sá A. A. Pereira Z.  

Publication

A new species of Acitheca (Psaroniaceae, Marattiales) with exceptionally and three-dimensionally preserved sporangia from the Buçaco Carboniferous Basin, western central Portugal [2024/12]

Journal

Review of Palaeobotany and Palynology

Annee/Jahrgang

2025

Volume

334

Issue

105274

Page number

4

Year

2024

Fossil Status

foliage (fertile)

Stratigraphy

Gzhelian

Strat. comment

Monsarros Formation

Location

Road M608 (coordinates 40◦26′28.1"N 8◦22’41.4"W), from Vale da Mó to Vale de Boi, Anadia, Buçaco Carboniferous Basin, western central Portugal

Paleoregion

Laurussia (Iberida)

Data for Holotypus

Repository

Museu de Geologia Fernando Real, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal

Repository Number

MGUTAD-1133

Num

I: 1

Pub.

A new species of Acitheca (Psaroniaceae, Marattiales) with exceptionally and three-dimensionally preserved sporangia from the Buçaco Carboniferous Basin, western central Portugal [2024/12]

Diagnosis

Relatively narrow and long fertile pinnules, bearing at least 13 synangia arranged on lamina in two rows flanking the midvein and near the pinnule margins. Bilaterally symmetrical and sessile synangia, composed of four elongate (fusiform type) and very small sporangia, with longitudinal striations. Longitudinally dehisced, straight to slightly curved and sclerified-like sporangia, with a triangular pyramid-like shape in the upper part, becoming distally acute; sporangium attached to pinnule lamina by a rounded to hexagonal-like attachment base; spherical spores. Sterile pinnules lingulate with prominent basiscopic lobe; simple to once bifurcate lateral veins; about 40 veins per cm at the pinnule margin.