Higher Classification: > Kingdom Animalia > Subkingdom Eumetazoa > Phylum Nematoda > Class Chromadorea > Subclass Chromadoria > Order Monhysterida > Suborder Monhysterina > Superfamily Sphaerolaimoidea > Family Xyalidae > Genus Theristus

Theristus problematicus (Allgén, 1927) Wieser, 1956

Rank: Species
Taxon Status: accepted

Relationships towards this taxon

Genus group names

*Theristus*	Bastian, 1865	accepted genus name
*Penzancia*	de Man, 1889	synonym
*Theristus (Penzancia)*	de Man, 1889	synonym

Species group names

*Monhystera problematica*	Allgén, 1927	synonym

Literature

basis of record	Coomans, A. V. (1989). Overzicht van de vrijlevende nematofauna van België (Nematoda). [The freeliving nematofauna of Belgium: a review.]. In Wouters, K.; Baert, L. (Ed.): Invertebraten van België = Invertébrés de Belgique: Verhandelingen van het Symposium "Invertebraten van België" = Comptes rendus du Symposium "Invertébrés de Belgique" = Proceedings of the Symposium "Invertebrates of Belgium". Brussel, 25-26 november 1988. Koninklijk Belgisch Instituut voor Natuurwetenschappen: Brussel, Belgium. 43-56.
additional source	Vanreusel, A. (1990). Ecology of the free-living marine nematodes from the Voordelta (Southern Bight of the North Sea). I. Species composition and structure of the nematode communities. Cah. Biol. mar. 31: 439-462.
additional source	Leduc, D.; Gwyther, J. (2008). Description of new species of Setosabatieria and Desmolaimus (Nematoda: Monhysterida) and a checklist of New Zealand free-living marine nematode species. New Zealand Journal of Marine and Freshwater Research. 42(3): 339-362.
additional source	Yeates, G. W. (2010). Phylum Nematoda: roundworms, eelworms. in: Gordon, D.P. (Ed.) (2010). New Zealand inventory of biodiversity: 2. Kingdom Animalia: Chaetognatha, Ecdysozoa, Ichnofossils. pp. 480-493.
new combination reference	Wieser, W. (1956). Free-living marine nematodes III. Axonolaimoidea and Monhysteroidea. Acta Univ Lund N. F. Avd. 2. Bd 52. Nr 13: 1-115.

Genbank

Taxonomy

NeMys

Citation

Nemys eds. (2025). Nemys: World Database of Nematodes. Theristus problematicus (Allgén, 1927) Wieser, 1956. Via: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvantidis, C.; Appeltans, W. (2011) European Register of Marine Species, Accessed through PESI at http://www.eu-nomen.eu/portal/taxon.php?GUID=urn:lsid:marinespecies.org:taxname:153451