The Fossil Record of Freshwater Micro-Algae Pediastrum Meyen (Chlorophyceae) in Southern South America

2005 ◽  
Vol 34 (4) ◽  
pp. 433-444 ◽  
Author(s):  
María del C. Zamaloa ◽  
Guillermo Tell
Keyword(s):  
South America ◽  
Fossil Record ◽  
Southern South America

A Panorpoid (Insecta: Mecoptera) from the Lower Eocene of Patagonia, Argentina

2009 ◽  
Vol 83 (6) ◽  
pp. 994-997 ◽  
Author(s):  
Julián F. Petrulevičius
Keyword(s):  
South America ◽  
Southern Hemisphere ◽  
Lower Cretaceous ◽  
Fossil Record ◽  
Uneven Distribution ◽  
Fossil Insects ◽  
Lower Eocene ◽  
Southern South America ◽  
Stem Group ◽  
Recent Species

The order Mecoptera is represented on all continents, albeit with an uneven distribution. Mecoptera includes about 34 families (Labandeira, 1994, p. 34), only four of them, until now, represented in South America: Permochoristidae Tillyard, 1917 (†) (Pinto, 1972); Bittacidae Handlirsch, 1906 [and stem-group “Neorthophlebinae” (†)] (Petrulevičius, 2001a, 2003, 2007); Nannochoristidae Tillyard, 1917; and Eomeropidae Cockerell, 1909. The two latter families have a present relict distribution in southern South America but without fossil record, obviously an artifact due to few studies of fossil insects in the subcontinent. The diversity of recent Bittacidae is high in South America with respect to other continents. Thirty-five percent of recent genera of Bittacidae come from South America, and 80% of these genera are endemic (extracted from Penny, 1997). Bittacidae is well represented in the fossil record, with species from the Jurassic of Patagonia (Petrulevičius, 2007), Lower Cretaceous of Brazil (Petrulevičius and Martins-Neto, 2001), to the late Paleocene of Argentina (Petrulevičius, 1998, 1999, 2001b, 2003). This contribution reports a specimen belonging to the Panorpoidea, a group with no recent species in South America and very few species in the entire Southern Hemisphere.

The santonian through paleogene record of Proteaceae in the southern South America - Antarctic peninsula region

1998 ◽  
Vol 11 (4) ◽  
pp. 373 ◽  
Author(s):  
Rosemary A. Askin ◽  
Alicia M. Baldoni
Keyword(s):  
South America ◽  
Antarctic Peninsula ◽  
Late Cretaceous ◽  
Fossil Record ◽  
Type Species ◽  
Pollen Record ◽  
South American ◽  
Southern South America ◽  
Nothofagus Forest ◽  
The Antarctic

Proteaceous plants were an important component of the high-latitude Late Cretaceous–Paleogene podocarpaceous conifer and Nothofagus forest vegetation growing in high-rainfall temperate conditions. In the southern South America–Antarctic Peninsula region the fossil record of the Proteaceae comprises pollen, leaves, fruits and wood with affinities to the extant subfamilies Grevilleoideae, Proteoideae, and possibly Carnarvonioideae and Persoonioideae. The oldest reported occurrences of Proteaceae in this region are in the middle–late Santonian of the Antarctic Peninsula and include pollen of Proteacidites subscabratus Couper, with the addition in the Campanian of other species of Proteacidites and Propylipollis, Cranwellipollis spp. and Peninsulapollis spp. Diversity of proteaceous pollen increased through the Campanian and Maastrichtian, reflecting the spread of Proteaceae along the Antarctic Peninsula and into South America. Both endemic species and species derived from the Australian region are represented. Compared to coeval Australian assemblages, however, proteaceous diversity remained relatively low. Interestingly, Beauprea-type species (Beaupreaidites spp., Peninsulapollis spp.) are common and varied in the Antarctic Peninsula from Campanian into the Eocene, yet the South American pollen record does not include these forms, except for rare Peninsulapollis gillii. Possibly drier conditions may have discouraged northward migration of this group. South American fossil proteaceous taxa are primarily related to Grevilleoideae, a trend that continues into the modern flora on that continent.

First fossil record of Calyceraceae (Asterales): Pollen evidence from southern South America

2010 ◽  
Vol 158 (3-4) ◽  
pp. 236-239 ◽  
Author(s):  
Luis Palazzesi ◽  
Viviana Barreda ◽  
María Cristina Tellería
Keyword(s):  
South America ◽  
Fossil Record ◽  
Southern South America

A new species of Fitzroya (Cupressaceae) from oligocene sediments in north-western Tasmania

1996 ◽  
Vol 9 (6) ◽  
pp. 867 ◽  
Author(s):  
RS Hill ◽  
SS Whang
Keyword(s):  
New Species ◽  
South America ◽  
Fossil Record ◽  
Leaf Shape ◽  
Fossil Species ◽  
Southern South America ◽  
Plant Associations ◽  
Fossil Records ◽  
North Western ◽  
A New Species

Vegetative twigs from Oligocene sediments in north-western Tasmania are assigned to a new fossil species of Fitzroya, F. tasmanensis. These twigs differ from extant F. cupressoides in leaf shape and stomatal orientation and morphology. This is the first fossil record of Fitzroya from outside the current range of the genus (South America). Previous fossil records of Fitzroya from South America are almost certainly erroneous. These fossils occur in sediments with leaves and cupules of Nothofagus subgenus Nothofagus, which is also restricted to South America today. This suggests that some current plant associations in southern South America provide good analogues for vegetation in Oligocene Tasmania.

The genus Swiftopecten Hertlein, 1936, (Bivalvia: Pectinidae) in the Tertiary of southern South America

1995 ◽  
Vol 69 (6) ◽  
pp. 1054-1059 ◽  
Author(s):  
Claudia J. Del Río
Keyword(s):  
New Species ◽  
South America ◽  
Fossil Record ◽  
Late Eocene ◽  
South American ◽  
Sedimentary Sequence ◽  
American Continent ◽  
Antarctic Region ◽  
Southern South America ◽  
South American Continent

The presence of Swiftopecten Hertlein, 1936, in Patagonia (Argentina), a region situated in the southeastern extreme of the South American continent, is the oldest and southernmost fossil record of the genus. Furthermore, its occurrence during the Late Eocene in the circum-Antarctic region suggests that its origin was in the Southern Hemisphere; it has been known from Japan and the eastern Pacific, ranging from Miocene to Holocene (Moore, 1984). Swiftopecten iheringii new species, from the Late Eocene-Early Miocene sedimentary sequence of Patagonia, is described and illustrated.

First Quaternary fossil record of Polyplacophorans from southern South America

Geobios ◽  
2009 ◽  
Vol 42 (3) ◽  
pp. 265-271 ◽  
Author(s):  
Sandra Gordillo ◽  
Enrico Schwabe
Keyword(s):  
South America ◽  
Fossil Record ◽  
Southern South America
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