Agathoxylon santacruzense Kloster et Gnaed.

Plant Fossil Names Registry Number: PFN000203


Authors: A. C. Kloster & S. C. Gnaedinger

Rank: species

Reference: Kloster, A. C. & Gnaedinger, S. C. (2018): Coniferous wood of Agathoxylon from the La Matilde Formation, (Middle Jurassic), Santa Cruz, Argentina. – Journal of Paleontology 92(4): 546–567.

Page of description: 557

Illustrations or figures: figs 7, 8


Holotype CTES-PB 12012, CTES-PMP 2433 a, b, c, Universidad Nacional de Nordeste “Dr. Rafael Herbst”, Corrientes, Argentina
Figures: figs 7, 8

Note: Paratype: CTES-PB 12013, CTES-PMP 2434 a, b, c.

Repository as: Paleobotany Section, Universidad Nacional de Nordeste, “Dr. Rafael Herbst”.

Original diagnosis/description

Wood type (tracheid radial pitting) is araucarian (100% of the contiguous pits are araucarioid). Pits are araucarioid, uniseriate, flattened, and circular; alternate biseriate, circular, and hexagonal; uniseriate, partially biseriate, alternate, circular, hexagonal-flattened; and opposite circular, hexagonal-flattened in a pair or several pairs (japonicum type); and triseriate and bitriseriate, alternate circular and hexagonal. Cross-fields are araucarioid, with 2–14, 20 pits, circular, with elliptical or sometimes circular apertures, whose frequency range is 6–8 pits, arranged in disordered groups or crown-shaped or some in two or four horizontal rows. The rays are homogeneous, mostly uniseriate, and the height in number of cells is 1–16, 20.


In reference to Santa Cruz province, Argentina, where the analyzed wood was found.


Jurassic, Middle Jurassic
La Matilde Formation


Santa Cruz Province

Plant fossil remain

fossil wood


Use comments to notify PFNR administrators of mistakes or incomplete information relevant to this record.