Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
2007 The Authors. Journal compilation 2007 The Norwegian Academy of Science and Letters Zoologica Scripta, 36, 4, July 2007, pp337352 337 Arnedo, M. A., Agnarsson, I. & Gillespie, R. G. (2007). Molecular insights into the phylo-
 

Summary:  2007 The Authors. Journal compilation 2007 The Norwegian Academy of Science and Letters Zoologica Scripta, 36, 4, July 2007, pp337352 337
Arnedo, M. A., Agnarsson, I. & Gillespie, R. G. (2007). Molecular insights into the phylo-
genetic structure of the spider genus Theridion (Araneae, Theridiidae) and the origin of the
Hawaiian Theridion-like fauna. -- Zoologica Scripta, 36, 337352.
The Hawaiian happy face spider (Theridion grallator Simon, 1900), named for a remarkable
abdominal colour pattern resembling a smiling face, has served as a model organism for under-
standing the generation of genetic diversity. Theridion grallator is one of 11 endemic Hawaiian
species of the genus reported to date. Asserting the origin of island endemics informs on the
evolutionary context of diversification, and how diversity has arisen on the islands. Studies on
the genus Theridion in Hawaii, as elsewhere, have long been hampered by its large size (> 600
species) and poor definition. Here we report results of phylogenetic analyses based on DNA
sequences of five genes conducted on five diverse species of Hawaiian Theridion, along with
the most intensive sampling of Theridiinae analysed to date. Results indicate that the Hawai-
ian Islands were colonised by two independent Theridiinae lineages, one of which originated
in the Americas. Both lineages have undergone local diversification in the archipelago and
have convergently evolved similar bizarre morphs. Our findings confirm para- or polyphyletic
status of the largest Theridiinae genera: Theridion, Achaearanea and Chrysso. Convergent
simplification of the palpal organ has occurred in the Hawaiian Islands and in two continental
lineages. The results confirm the convergent evolution of social behaviour and web structure,
both already documented within the Theridiidae. Greater understanding of phylogenetic

  

Source: Agnarsson, Ingi - Department of Biology, Universidad de Puerto Rico

 

Collections: Biology and Medicine