Abstract of Palaeobotanist-61(1) - Birbal Sahni Institute of ...

The Palaeobotanist 61(2012): 67-74
0031-0174/2012 $2.00
New evidence of plant-insect interactions in the
Lower Permian from Western Gondwana
E.R.S. PINHEIRO * , G.P. TYBUSCH AND ROBERTO IANNUZZI
Laboratório de Paleobotânica, Departamento de Paleontologia e Estratigrafia, Instituto de
Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, prédio 43127/
213, CEP 91509-900, Porto Alegre, Rio Grande do Sul, Brasil.
*
Corresponding author: esther.pinheiro@ufrgs.br
(Received 23 March, 2011; revised version accepted 23 December, 2011)
ABSTRACT
Pinheiro ERS, Tybusch GP & Iannuzzi R 2012. New evidence of plant-insect interactions in the Lower P ermian
from Western Gondwana. The Palaeobotanist 61(1): 67-74.
A new record of insect damages-containing glossopterid leaves is recovered from the Rio da Estiva outcrop,
Itaiópolis country, northernmost Santa Catarina State, southern Brazil. The plant fossil-bearing strata are situated,
stratigraphically, from the basal to middle part of the Rio Bonito Formation, a unit of the Lower Permian sequence of the
Paraná Basin. This plant assemblage is characterized as “pure Glossopteris Flora”, and contains remains of glossopterid
leaves (Glossopteris spp. and Gangamopteris sp.), seeds (Samaropsis sp. and Cordaicarpus sp.) and fructification (Ottokaria
sp.). We analyzed 102 samples, of which only ten showed evidence of insect damages. Three types of leaf feeding traces
are observed: leaf margin feeding traces, hole feeding traces and trench feeding traces. The damages occurred in leaves of
Glossopteris sp., Glossopteris communis, Glossopteris occidentalis and Gangamopteris obovata. The evidence of
consumption of foliar tissues indicated that glossopterids hosted a functional feeding group of predominantly chewing and
sucking type of insects. The differences found in the patterns and frequencies of consumption in different localities of
equivalent ages suggested that herbivory was more intensive in some plant communities than in others. Besides this, the
present study expanded geographically the distribution of records of plant-insect interactions in “Glossopteris flora”
through the central portion of the eastern rim of Paraná Basin.
Key-words—Glossopteris flora, Herbivory, Rio Bonito Formation, Paraná Basin, Early Permian.
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