Belongs within: Oniscidea.
The Synocheta are a clade of small slaters restricted to damp habitats. Some species have become aquatic cave-dwellers. Males of this group have the genital ducts fusing within the penis, so that they penis bears only a single opening. The pleopodal musculature is stronger in members of the superfamily Trichoniscoidea than in Styloniscoidea.
Synapomorphies (Schmidt 2008): Male genital ducts distally fused; eyes with at most 3 ommatidia; remotor muscles of pleopod protopodites M9, 11 and 13 composed of 2 strands each.
<==SynochetaMD01
|--StyloniscoideaMD01
| |--SchoebliidaeMD01
| |--TitaniidaeMD01
| |--TunanoniscidaeMD01
| `--Styloniscidae [Patagoniscidae]MD01
| |--Notoniscus [Notoniscinae]Va73
| | `--N. tasmanicus (Chilton 1915)Va73
| |--Styloniscus Dana 1852 [Styloniscinae]Va73
| | |--S. (Styloniscus)Va73
| | | |--S. (S.) australiensis Vandel 1973Va73
| | | | |--S. a. australiensisVa73
| | | | `--S. a. cavernicolus Vandel 1973Va73
| | | |--S. (S.) otakensis (Chilton 1901) [=Trichoniscus otakensis]Va73
| | | |--S. (S.) squarrosus Green 1961Va73
| | | |--S. (S.) thomsoni (Chilton 1901) [=Trichoniscus thomsoni]Va73
| | | `--S. (S.) verrucosus (Budde-Lund 1906) [=Trichoniscus verrucosus]Va73
| | `--S. (Euroniscus Vandel 1973)Va73
| | `--S. (*E.) commensalis (Chilton 1910)Va73
| `--Clavigeroniscus mussauiH83
`--Trichoniscoidea [Endophora]MD01
|--BuddelundiellidaeMD01
`--TrichoniscidaeMD01
| i. s.: Cantabroniscus Vandel 1965S86
| `--C. primitivus Vandel 1965S86
| Scotoniscus Racovitza 1908S86
| `--S. macromelos Racovitza 1908S86
| Bureschia Verhoeff 1926S86
| `--B. bulgarica Verhoeff 1926S86
| Typhlotricholigioides Rioja 1953S86
| `--T. aquaticus Rioja 1953S86
| Brackenridgia Eigenmann & Ulrich 1902S86 [incl. ProtrichoniscusM90]
| |--B. bridgesi (van Name 1942)S86
| |--B. cavernarumM90
| |--B. heroldiM90
| `--B. reddelliM90
| Titanethes Schioedte 1849S86
| |--T. (Titanethes)S86
| | |--T. (T.) albus Schioedte 1849S86
| | |--T. (T.) biseriatus Verhoeff 1900S86
| | `--T. (T.) dahli Verhoeff 1926S86
| `--T. (Cyphonethes Verhoeff 1926)S86
| `--T. (C.) hercegovinensis Verhoeff 1900S86
| Alpioniscus Racovitza 1908S86
| | i. s.: A. feneriensisVu73
| | A. kratochvili Frankenberger 1939UO05
| |--A. (Illyrionethes Verhoeff 1927)S86
| | |--A. (I.) balthasariPN02
| | |--A. (I.) bosniensis Frankenberger 1939S86
| | `--A. (I.) heroldii Verhoeff 1931S86
| `--A. (Macedonethes Buturović 1955)S86
| `--A. (M.) skopjensis Buturović 1955S86
| Hyloniscus ripariusM90
| Haplophthalmus danicusM90
| Trichoniscoides Sars 1899M90, S86
| |--T. mixtus Racovitza 1908S86
| `--T. sarsiM90
| Amerigoniscus payneiM90
| Titana mirabilisN55
`--TrichoniscinaeH47
|--Cordioniscus stebbingiH47, M90
|--Oregoniscus Hatch 1947H47
| `--*O. nearcticus [=Trichoniscus nearcticus]H47
|--MiktoniscusH47
| |--M. halophilusM90
| `--M. medcofiH47
|--AndroniscusH47
| |--A. dentigerM90
| `--A. subterraneusVu73
`--Trichoniscus Brandt 1833BWW93
|--T. elisabethaeD37
|--T. flavescens Lucas 1846E12
|--T. provisoriusM90
|--T. pusillus [incl. T. demivirgo]M90
`--T. pygmaeusM90
*Type species of generic name indicated
References
[BWW93] Briggs, D. E. G., M. J. Weedon & M. A. Whyte. 1993. Arthropoda (Crustacea excluding Ostracoda). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 321–342. Chapman & Hall: London.
[D37] Dobzhansky, T. 1937. Genetics and the Origin of Species. Columbia University Press: New York.
[E12] Evenhuis, N. L. 2012. Publication and dating of the Exploration Scientifique de l’Algérie: Histoire Naturelle des Animaux Articulés (1846–1849) by Pierre Hippolyte Lucas. Zootaxa 3448: 1–61.
[H83] Hammen, L. van der. 1983. Contribution to the knowledge of the soil-fauna of New Guinea. Zoologische Verhandelingen 206: 1–36.
[H47] Hatch, M. H. 1947. The Chelifera and Isopoda of Washington and adjacent regions. University of Washington Publications in Biology 10 (5): 155–274.
[MD01] Martin, J. W., & G. E. Davis. 2001. An updated classification of the Recent Crustacea. Natural History Museum Los Angeles County, Science Series 39: 1–124.
[M90] Muchmore, W. B. 1990. Terrestrial Isopoda. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 805–817. John Wiley & Sones: New York.
[N55] Noirot, C. 1955. Termites du centre et du sud-ouest de l’Angola récoltés par A. de Barros Machado. Diamang Publicações Culturais 27: 139–150.
[PN02] Poggi, R., G. Nonveiller, A. Colla, D. Pavićević & T. Rađa. 2001–2002. Thaumastocephalini, a new tribe of Pselaphinae for Thaumastocephalus folliculipalpus n. gen., n. sp., an interesting new troglobious species from central Dalmatia (Croatia) (Coleoptera, Staphylinidae, Pselaphinae). Annali del Museo Civico di Storia Naturale “Giacomo Doria” 94: 1–20.
Schmidt, C. 2008. Phylogeny of the terrestrial Isopoda (Oniscidea): a review. Arthropod Systematics and Phylogeny 66 (2): 191–226.
[S86] Sket, B. 1986. Isopoda: Oniscidea. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 482–485. E. J. Brill/Dr W. Backhuys: Leiden.
[UO05] Ubick, D., & R. Ozimec. 2005. On the harvestman genus Lola Kratochvíl (Opiliones: Laniatores). Natura Croatica 14 (3): 161–174.
[Va73] Vandel, A. 1973. Les isopodes terrestres de l’Australie. Étude systématique et biogéographique. Mémoires du Muséum National d’Histoire Naturelle, Série A, Zoologie 82: 1–171.
[Vu73] Vuilleumier, F. 1973. Insular biogeography in continental regions. II. Cave faunas from Tessin, southern Switzerland. Systematic Zoology 22 (1): 64–76.