Abstract
Two new genera of late Pleistocene Mimosoideae from Argentina are described. The fossils were recovered from the Arroyo Feliciano Formation in the upper Río Gualeguay Basin, eastern Argentina. The anatomical features suggest a relationship with Cylicodiscus Harms for the first one and Abarema Pittier and Hydrochorea Barneby and J.W. Grimes for the second. Cylicodiscuxylon paragabunensis gen. nov. and sp. nov. is characterised by diffuse-porous wood, solitary vessels, in radial multiples and in clusters; alternate and vestured intervessel pits; vasicentric, aliform, lozenge-aliform and confluent axial parenchyma, strands of 5–11 cells, prismatic crystals in chains in chambered axial parenchyma cells; 1–3 (4) seriate rays and homocellular, vessel-ray parenchyma pits similar in size and shape to intervessel pits, and non-septate fibres. Abaremaxylon hydrochorea gen. nov. and sp. nov. has the following diagnostic features: diffuse-porous wood, solitary vessels, in radial multiples and in clusters; alternate and vestured intervessel pits; vasicentric, aliform and unilateral aliform, confluent axial parenchyma, strands of 4–16 cells; prismatic crystals in chains in chambered axial parenchyma cells; exclusively uniseriate and homocellular rays, and non-septate fibres. The fossils described herein represent the first report of legume woods from the Río Gualeguay Basin. The record of Cylicodiscuxylon in southern South America supports the existence of an old relationship with the African flora and Abaremaxylon reinforces the idea that Neotropical flora was widespread in the past. The analysis of fossil plants suggests that they grew under warm and humid to semi-arid climatic conditions.
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Claims 9
Claim · model-written summary
Two new genera of late Pleistocene Mimosoideae from Argentina were described.
- Taxon
- Mimosoideaemimosoid cladee0
- Outcome
- Two new generae0
- Setting
- from Argentinae0
Verbatim
e0“Two new genera of late Pleistocene Mimosoideae from Argentina are described”
Claim · model-written summary
Cylicodiscuxylon paragabunensis gen. nov. and sp. nov. has diffuse-porous wood.
Verbatim
e1“Cylicodiscuxylon paragabunensis gen. nov. and sp. nov. is characterised by diffuse-porous wood, solitary vessels, in radial multiples and in clusters”
Claim · model-written summary
Abaremaxylon hydrochorea gen. nov. and sp. nov. has diffuse-porous wood.
Verbatim
e2“Abaremaxylon hydrochorea gen. nov. and sp. nov. has the following diagnostic features: diffuse-porous wood”
Claim · model-written summary
The fossils represent the first report of legume woods from the Río Gualeguay Basin.
Verbatim
e3“The fossils described herein represent the first report of legume woods from the Río Gualeguay Basin”
Claim · model-written summary
The record of Cylicodiscuxylon in southern South America supports an old relationship with the African flora.
Verbatim
e4“The record of Cylicodiscuxylon in southern South America supports the existence of an old relationship with the African flora”
Claim · model-written summary
Abaremaxylon reinforces the idea that Neotropical flora was widespread in the past.
Verbatim
e5“Abaremaxylon reinforces the idea that Neotropical flora was widespread in the past”
Claim · model-written summary
The fossil plants suggest that they grew under warm and humid to semi-arid climatic conditions.
Verbatim
e6“The analysis of fossil plants suggests that they grew under warm and humid to semi-arid climatic conditions”
Claim · model-written summary
The anatomical features suggest a relationship with Cylicodiscus Harms for the first genus.
- Taxon
- Mimosoideaemimosoid cladee0
- Outcome
- a relationship with Cylicodiscus Harmse7
- Qualifier
- for the first onee7
Verbatim
e0“Two new genera of late Pleistocene Mimosoideae from Argentina are described”
e7“The anatomical features suggest a relationship with Cylicodiscus Harms for the first one and Abarema Pittier and Hydrochorea Barneby and J.W. Grimes for the second”
Claim · model-written summary
The anatomical features suggest a relationship with Abarema Pittier and Hydrochorea Barneby and J.W. Grimes for the second genus.
- Taxon
- Mimosoideaemimosoid cladee0
- Outcome
- Abarema Pittier and Hydrochorea Barneby and J.W. Grimese7
- Qualifier
- for the seconde7
Verbatim
e0“Two new genera of late Pleistocene Mimosoideae from Argentina are described”
e7“The anatomical features suggest a relationship with Cylicodiscus Harms for the first one and Abarema Pittier and Hydrochorea Barneby and J.W. Grimes for the second”