Crinocheta

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Crinocheta
Armadillidium vulgare 001.jpg
Armadillidium vulgare
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Isopoda
Suborder: Oniscidea
Parvorder: Orthogonopoda
Section: Crinocheta
Legrand, 1946

Crinocheta is a clade of woodlice that includes the majority of described land-dwelling isopods (Oniscidae). [1] Crinocheta is regarded as monophyletic and the sister group of the clade Synocheta. [2] Some researchers refer to the group of the clades Crinocheta, Synocheta, and Microcheta as Orthogonopoda. [2] [3] [4]

Contents

Description

The plesiomorphic form of Crinocheta has two transverse lines present on the cephalothorax (linea frontalis or the linea supraantennalis), a "marginal line" that can be found on the vertex of the head (linea marginalis) and is a "runner" morphotype. Some families have lost the linea frontalis and/or the linea supraantennalis but all members have retained the linea marginalis. [1]

Crinocheta have a large number of ommatidia compared to other Oniscidae clades. Some reports claim up to 200 ommatidia can be present in some genera but many dispute this claim and maximum of 80. The majority of species have no more than 30 ommatidia. [1]

The second antennae of this clade appear to be made of only five articles because the basal-most article is fused with the head capsule. The distal end of these antennae also bare a tuft that acts as a sensory organ. [1]

In almost all Crinocheta the legs of the first thoracic segment have a distal end with a brush for cleaning the antennae.

Many Crinocheta can conglobate but not all. [1]

Etymology

This clade was first introduced by Jean-Jacques Legrand in 1946 [1] . The origin of the name Crinocheta is not certain but it may refer to the forked penes present in this group. [5]

Families

There are currently 31 families that are considered part of this clade. [6]

*These families' places in this clade have been occasionally disputed. [1]

References

  1. 1 2 3 4 5 6 7 Schmidt, Christian (2002). "Contribution to the phylogenetic system of the Crinocheta (Crustacea, Isopoda). Part 1. (Olibrinidae to Scyphacidae s. str.)". Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologische Reihe. 78 (2): 275–352.
  2. 1 2 "The monophyly and the classification of the terrestrial isopods (Crustacea, Isopoda, Oniscidea)". ResearchGate. Archived from the original on 2022-04-27. Retrieved 2026-01-21.
  3. ↑ "WoRMS - World Register of Marine Species - Out of scope". www.marinespecies.org. Retrieved 2026-01-21.
  4. ↑ Tabacaru, Ionel; Danielopol, Dan (1996). "Phylogénie des isopodes terrestres". Acad. Sci. Paris sér. III, Sciences de la Vie, Évolution. 319: 71–80.
  5. ↑ "American Isopod and Myriapod Group - Crinocheta". www.americanisopodsmyriapods.com. Retrieved 2026-01-21.
  6. ↑ "WoRMS - World Register of Marine Species - Out of scope". www.marinespecies.org. Retrieved 2026-01-21.
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