Article · Wikipedia archive · Last revised Jul 7, 2026

Synocheta

Synocheta is a major monophyletic section of small, often frail-appearing isopods in the suborder Oniscidea. It is currently considered closely related to the smaller section Microcheta, which together form the clade Monospermophora, although some workers consider it to be closer to the much larger section Crinocheta. All three sections form the monophyletic supersection Orthogonopoda, which contains the vast majority of the diversity within Oniscidea.

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Synocheta
Trichoniscus tabulae
Iuiuniscus iuiuensis
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Clade: Pancrustacea
Class: Malacostraca
Order: Isopoda
Suborder: Oniscidea
Parvorder: Orthogonopoda
Section: Synocheta
Legrand, 1946

Synocheta is a major monophyletic section of small, often frail-appearing isopods in the suborder Oniscidea. It is currently considered closely related to the smaller section Microcheta, which together form the clade Monospermophora, although some workers consider it to be closer to the much larger section Crinocheta.1 All three sections form the monophyletic supersection Orthogonopoda, which contains the vast majority of the diversity within Oniscidea.1

Description

The section Synocheta is mainly defined by the fusion of the ejaculatory ducts in the male genital apophysis, resulting in a single spermatophore being produced.1 In Microcheta, a single spermatophore is also produced but the ducts remain separate, while in Crinocheta two spermatophores are produced from distantly-placed ducts.1 In addition, many members of Synocheta generally have 3 or less ommatidia, and the pleopod protopod remoter muscles M9, M11 and M13 have 2 strands instead of 3.2

Taxonomy

There are 5-6 families in Synocheta split between 2 superfamilies, Styloniscoidea and Trichoniscoidea. The family Buddelundiellidae is often placed as a subfamily of the family Trichoniscidae,2 although some authors dispute this and raise it to family level.1

This section includes the following families:1

References

References

  1. Tabacaru, Ionel; Giurginca, Andrei (2019). "Contributions to the study of the Trichoniscidae (Isopoda, Oniscidea). I. Definition and taxonomic position". Travaux de l'Institut de Spéologie "Émile Racovitza". 58: 47–63 – via ResearchGate.
  2. Schmidt, Christian (2008). "Phylogeny of the Terrestrial Isopoda (Oniscidea): a Review". Arthropod Systematics & Phylogeny. 66 (2): 191–226. doi:10.3897/asp.66.e31684.