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

Theristus gracilis (de Man, 1876) Filipjev, 1918

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

*Monohystera gracilis*	de Man, 1876	synonym

Literature

basis of record	De Smet, G.; Vincx, M.; Vanreusel, A.; Vanhove, S.; Vanaverbeke, J.; Steyaert, M. (2001). Nematoda - free living. In: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50. 161-174.
additional source	Various Authors (2000). Nematode filing cabinet of the Marine Biology Section Ugent - in combination with the NemasLan Ms-Access database (published on CD-Rom, 2000)
additional source	Kreis, H. A. (1929). Freilebende marine Nematoden von der Nordwest-Küste Frankreichs (Trébeurden Côtes du Nord). Capita Zoologica. II, 7: 1-98.
new combination reference	Filipjev, I. N. (1918). Free-living marine nematodes of the Sevastopol area. Transactions of the Zoological Laboratory and the Sevastopol Biological Station of the Russian Academy of Sciences. Series II No 4 (Issue I & II) (Translated from Russian).
ecology source	de Man, J. G. (1876). Contribution à la connaissance des Nématodes marins du Golf de Naples. Tijdschrift der Nederlandsche Dierkundige Vereeniging. 3: 88-118.

Genbank

Taxonomy

NeMys

Citation

Nemys eds. (2025). Nemys: World Database of Nematodes. Theristus gracilis (de Man, 1876) Filipjev, 1918. 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:121612