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A photo-album by Carles Martín-Closas

Charophyte thalli from the Uppermost Barremian of Las Hoyas (Cuenca, Spain)

Macrofossils

Clavatoraxis robustus MARTIN-CLOSAS et DIEGUEZ 1998

Apex of large thallus showing main axis covered with granules (spine-cell rosettes) and three closely packed whorls of branchlets.

Clavatoraxis robustus 150KB © Carles Martín-Closas

Clavatoraxis diaz-romerali MARTIN-CLOSAS et DIEGUEZ 1998

Fragment of delicate thallus showing disperse spine-cell rosettes scattered upon the surface. Species named after Mr. Armando Diaz-Romeral from Cuenca, who kindly lent these fossils for study.

Clavatoraxis diax-romerali 68KB © Carles Martín-Closas

Charaxis spicatus 76KB © Carles Martín-Closas

Charaxis spicatus MARTIN-CLOSAS et DIEGUEZ 1998

Apex of thallus showing five nodes bearing long unicellular branchlets.

Paleonitella vermicularis 75KB © Carles Martín-Closas

Paleonitella vermicularis MARTIN-CLOSAS et DIEGUEZ 1998

Fragment of filamentous ecorticate thallus with nodes bearing small unicellular branchlets.

 

Thin sections

Clavatoraxis robustus MARTIN-CLOSAS et DIEGUEZ 1998

Deep tangential section trough internode showing cortical cells covered by spine-cell rosettes. These are interpreted to be an adaptation against herbivores. Width of internode 2,3 mm.

Clavatoraxis robustus 71KB © Carles Martín-Closas

Clavatoraxis diaz-romerali MARTIN-CLOSAS et DIEGUEZ 1998

Longitudianl section trough phylloid showing whorls of spine-cell rosettes. Width of section 0,8 mm.

Clavatoraxis diax-romerali 52KB © Carles Martín-Closas

Charaxis spicatus 193KB © Carles Martín-Closas

Charaxis spicatus MARTIN-CLOSAS et DIEGUEZ 1998

Slightly oblique section through internodes showing cortication. Main diameter of section 1,8 mm.

Charaxis spicatus 196KB © Carles Martín-Closas

Charaxis spicatus MARTIN-CLOSAS et DIEGUEZ 1998

Longitudinal section through apex of thallus. Total length of section 7 mm.

 

Fragments of Charophyte thalli from the Lower Cretaceous of the Maestrat basin (Castelló, Spain)

Clavatoraxis sp.

Fragment of thallus showing spirally arranged spine-cell rosettes and cortication. Diameter of thallus ca 0,4 mm. Berriasian of Els Mangraners section.

Clavatoraxis sp. 36KB © Carles Martín-Closas

Clavatoraxis sp.

Fragment of phylloid showing spine cell rosettes arranged in whorls. Total length of fragment ca 1 mm. Berriasian of Els Mangraners section.

Clavatoraxis sp. 24KB © Carles Martín-Closas

"Munieria"-type thalli 45KB © Carles Martín-Closas

"Munieria"-type thalli

Lateral view of internodes showing interdigitation of cortical cells in the central area. Total length of largest fragment 1,4 mm. Lower Barremian of Barranc de l'Escresola.

"Munieria"-type thalli 36KB © Carles Martín-Closas

"Munieria"-type thalli

Transversal sections trough internode (above) and node (below) showing external crenulation corresponding to cortical cells. Nodal cells are visible below. Diameter 0,4 mm. Lower Barremian of Barranc de l'Escresola.

References

  • Martín-Closas, C. and Diéguez C. (1998): Charophytes from the Lower Cretaceous of the Iberian Ranges (Spain), Paleontology, 41(6): 1133-1152.

  • Martín-Closas, C. (1999): Epiphytic overgrowth of charophyte thalli by stromatolite-like structures and fungi in the Lower Cretaceous of the Iberian Ranges (Spain). Australian Journal of Botany, 47: 305-313.

  • Martín-Closas C. (2000): Els caròfits del Juràssic superior i el Cretaci inferior de la Península Ibèrica. Arxius de les Seccions de Ciències, 125. Institut d'Estudis Catalans, Barcelona, 304p. (In Catalan with abridged version in English).


Carles Martín-Closas
 
Departament d’Estratigrafia i Paleontologia,
Facultat de Geologia,
Universitat de Barcelona,
Z,.U. Pedralbes,
SP-08071 Barcelona
Catalunya, Spain
 
Email: cmartin@natura.geo.ub.es
URLs: http://www.ub.es/dpep/3lin17-3.htm
http://www.ub.es/dpep/3lin18-3.htm

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