NOMEN: Monostomata Huxley 1875 [T.H. Huxley. On the classification of the animal kingdom. – The Journal of the Linnaean Society. Zoology, 1875, 12 (59): 199-226]
ORIGINAL LISTED MEMBERSHIP (Huxley 1875): Rotifera + Turbellaria + Trematoda + Nematoidea + Annelida (Hirudinea + Oligochaeta + Polychaeta) + Cnidaria (Hydrozoa + Actinozoa) + Ctenophora + Arthropoda + Brachiopoda + Enteropneusta + Chaetognatha + Mollusca + Echinodermata + Chordata (Tunicata + Vertebrata)
JUNIOR CIRCUMSCRIPTIONAL SYNONYMS:
= Eumetazoa Bitschli 1910
= Neuromyaria Lameere
1927
= Gastraeozoa Nielsen 1985
= Neuralia Nielsen 2008
NON-MONOSEMANTIC CIRCUMSCRIPTIONAL SYNONYM (distinctly without Placozoa):
= Gastraeozoa Nielsen 1985
TYPIFIED NAME IN BASIC FORMAT: Araneus/fg
(sine
Spongia; incl. Fasciola, Tubipora)
TYPIFIED
NAMES IN USE:
MODERN
STATUS: 
the valid, the oldest name of a generally
accepted, holophyletic taxon.
Systematic position of Monostomata:
| Metazoa
Haeckel 1874
Porifera Grant 1836 (= Polystomata Huxley 1875) Placozoa Grell 1971 Orthonectida Giard 1877 Rhombozoa Van Beneden 1882 Monostomata Huxley 1875 |
COMMENT. Originally (Huxley 1875) Cestoidea and Acanthocephala were not included into Monostomata: they were placed to a taxon Agastreae which was opposed to Gasterae (= Porifera + Monostomata). However, the author noted that the taxon Agastreae was establishes only provisionally, and "probable as it may be that these are Gastraea with aborted digestive cavities"; he also wrote that Cestoidea are "closely allied with the Trematoda". Thus, estimating the admissible membership of the name Monostomata, we must not regard Cestoidea and Acanthocephala as belonging to the originally excluded membership, and, thus, the name Monostomata can be applied for a taxon which includes Cestoidea and Acanthocephala.