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The evolutionary expansion of the Spirurida

A G Chabaud¹, O Bain

¹Laboratoire de Biologie Parasitaire, Protistologie et Hélminthologie, Paris, France.

International Journal for Parasitology

|December 1, 1994

Summary

The origins of nematode superfamilies (Spirurida) are complex, with evidence suggesting ancient radiation and host-driven expansion. This study traces evolutionary pathways using morphology and distribution data.

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Area of Science:

Zoology
Evolutionary Biology
Parasitology

Background:

The Spirurida order comprises 12 superfamilies with diverse host and geographic distributions.
Understanding their evolutionary history is crucial for comprehending nematode diversification.

Purpose of the Study:

To investigate the phylogenetic origins of the 12 Spirurida superfamilies.
To elucidate the evolutionary relationships and radiation patterns within the Spirurida.

Main Methods:

Comparative morphology analysis.
Examination of host and geographic distribution data.
Phylogenetic inference based on available evidence.

Main Results:

The Spirurida exhibit a complex evolutionary history, with origins traced to Seuratoidea and Cosmocercoidea (Ascaridida).
Radiation likely occurred in the Secondary or early Tertiary eras, followed by expansion via host capture.
Specific family origins were proposed, including Seuratidae giving rise to several superfamilies and Filarioidea having multiple origins.

Conclusions:

The Spirurida represent an ancient nematode radiation with complex ancestral relationships.
Host-parasite interactions played a significant role in their evolutionary expansion.
Tissue parasitism evolved secondarily in various spirurid lineages.

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