Phylogeny of embiopterans (Insecta)

Area of Science:

• Entomology
• Systematics
• Phylogenetics

Background:

• Embiopterans, or webspinners, represent a unique order of insects with complex evolutionary histories.
• Previous systematic studies have faced challenges in resolving the relationships between embiopteran families and genera.

Purpose of the Study:

• To conduct a comprehensive cladistic analysis of Embioptera using morphological and molecular data.
• To re-evaluate the monophyly of embiopteran families and the relationships between genera.
• To identify novel morphological characters for improved phylogenetic resolution.

Main Methods:

• Cladistic analysis of 157 embiopteran species and 186 morphological characters.
• Molecular phylogenetic analysis of 22 taxa using 16S, 18S, 28S rDNA, and COI genes.
• Inclusion of species from all known families, except Andesembiidae.

Main Results:

• Monophyly supported for Australembiidae, Oligotomidae, Teratembiidae, and Anisembiidae.
• Notoligotomidae found to be paraphyletic and nested within Archembiidae (also paraphyletic).
• Morphological evidence strongly supports a clade including Embia, Cleomia, Macrembia, Dihybocercus, and Australembiidae.
• Newly described Anisembiidae genera often appear paraphyletic or polyphyletic.
• Ovipositor, cephalic, and leg structures provide significant phylogenetic information, often overlooked in classical approaches.

Conclusions:

• The study refines the understanding of embiopteran family monophyly and intergeneric relationships.
• Morphological characters, particularly ovipositor and cephalic/leg structures, are critical for resolving embiopteran phylogeny.
• The classification of several embiopteran families and genera requires revision based on the presented evidence.