Sonapteris barthelii Pšenička, Bek et R.Rössler

Plant Fossil Names Registry Number: PFN000013


Authors: J. Pšenička, J. Bek & R. Rößler

Rank: species

Genus: Sonapteris Pšenička, Bek et R.Rössler

Reference: Pšenička, J., Bek, J. & Rößler, R. (2005): Two new species of Sonapteris gen. nov. (Botryopteridaceae) based on compressions from the Upper Carboniferous (Bolsovian-Westphalian D) of the Pilsen Basin, Bohemian Massif. – Review of Palaeobotany and Palynology 136: 111–142.

Page of description: 115

Illustrations or figures: pls I–VI

Name is type for

Sonapteris Pšenička, Bek et R.Rössler 2005


Holotype F 0503, West Bohemian Museum in Pilsen, Plzeň, Czech Republic
Figures: pls I–VI

Original diagnosis/description

More than 1500 sporangia tightly packed in globose-ovate fertile organs. Fertile organs alternate, 15 mm in diameter and attached to secondary pinna rachis 2.4 mm wide. Uniseriate, multicellular trichomes 2 mm long, covering all order of rachises. Epidermal cells of secondary pinna rachis polygonal and 25–50 μm in diameter. Penultimate rachises 0.4 mm wide, alternate on central rachis of sporangium mass. Ultimate rachises vary from 0.2 to 0.3 mm. Sporangia solitary placed at the end of ultimate rachises. Sporangia ovoid, 470 (560) 695 μm long, 354 (450) 541 μm wide. Apical part of sporangium (just closely above lateral annulus) consists of small thin-walled polygonal cells. The annulus is horizontally elongated, and consists of thick-walled cells. Dehiscence area consisting of a four-seriate band of thinwalled cells. Thin-walled cells of the sporangium wall are polygonal, sometimes elongated.
Spores trilete, triangular to subtriangular, 33 (38.2) 43 μm in diameter, sides concave to straight. Rays of the trilete mark one-half of the radius. Finely scabrate, microspinate to microgranulate laevigate exine 1 μm thick.


In honour of Prof. Manfred Barthel from the Museum für Naturkunde, Berlin, a famous palaeobotanist and friend.


the Upper Carboniferous (Bolsovian), Whetstone Horizon of the Kladno Formation, Radnice Member


Czech Republic
Brandýsek locality (near Nýřany) of the Pilsen Basin

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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