Back
Cymastrobus irvingii
Cymastrobus irvingii Evreïnoff, Mey.-Berth., Decombeix, R. Lebrun, Steem., Taffor. Palaeont. Electr., 20(3.47A): 3. 14 Sep 2017
- Name
- Cymastrobus irvingii
- Rank
- Species
- Generic Name
- [Genus] Cymastrobus
- Authors (Pub.)
- Evreïnoff M.
Meyer-Berthaud B.
Decombeix A.-L.
Lebrun R.
Steemans P.
Tafforeau P.
- Publication
- A new Late Devonian isoetalean lycopsid from New South Wales, Australia: Cymastrobus irvingii gen. et sp. nov. [2017/9]
- Journal
- Palaeontologia Electronica
- Volume
- 20
- Issue
- 3.47A
- Page number
- 3
- Year
- 2017
- Fossil Status
- cones
- Stratigraphy
- Famennian
- Location
- left bank of the Manilla River, upstream from the Connors Creek crossing, Mandowa Mudstone, Barraba, New England, New South Wales, Australia
- Paleoregion
- Gondwana (Australia)
Data for Holotypus
- Repository
- National Museum of Victoria, Melbourne, Australia
- Repository Number
- NMVP 161998
- Diagnosis
- Large bisporangiate cone that may exceed 8 cm long and 5 cm wide. Cone axis narrow, about 10% the width of the cone, containing a ring of primary xylem showing a corrugated outline with an almost continuous band of exarch protoxylem; sporophyll traces departing from the bays of the primary xylem cylinder. Sporophyll-sporangium units arranged helically, about 8-10 per gyre. Sporophylls comprised of a long, narrow pedicel widening distally but without alations, and a delicate distal lamina oriented perpendicularly to the pedicel; pedicels showing an abaxial keel and a distal heel, the latter forming hexagonal shields protecting the sporangia externally. Megasporangia and microsporangia in distinct parts of the cones; megasporangia proximal, enclosing a large number of megaspores. Casts of megaspore central body up to 500 μm in diameter, showing numerous
small circular pores arranged in several rows around the trilete mark, smooth elsewhere. Casts of microspore central body less than 100 μm in
diameter, showing one small pore between the rays of the trilete mark.