NOMEN: Haemataria Haeckel 1874: 50 [E. Haeckel. Die Gastrea-Theorie, die phylogenetische Classification des Tierreichs und die Homologie der Keimblatter. - Jenaische Zeitschrift fur Naturwissenschaft, 1874, 8: 1-55]
ORIGINAL LISTED MEMBERSHIP (Haeckel 1874): Nemathelminthes + Bryozoa + Tunicata + Rhynchocoela + Gephyrea + Rotatoria + Annelida + Brachiopoda + Otocardia + Echinoderma + Arthropoda + Vertebrata
OBJECTIVE SYNONYM:
= Pentablasteria Haeckel
1874
JUNIOR
CIRCUMSCRIPTIONAL SYNONYMS:
= Coelomaria
Haeckel
1896
= Eubilateria Ax 1989
TYPIFIED NAME(S): Araneus/fg
(sine Fasciola, Medusa; incl. Gordius, Ascaris, Rotifer,
Lineus)
[f: Aranei Clerck (1757) 1758; g: Araneus Clerck (1757) 1758 (ICZN
Direction 104, 1959; Opinion 2224, 2009)]
TYPIFIED
NAMES IN USE: -
MODERN
STATUS: the valid, the oldest name for a taxon which is most probaly
holophyletic. 
COMMENT. Originally (Haeckel 1874), the name "Haemataria" was connected with a statement that these animals primarily have a body cavity filled with liquid (either blood or coelomic liquid); the other name - "Pentablasteria" was connected with a statement that they primarily have 5 embryonic cell layers. Probably, the both characters are wrong, being not initial for this taxon. But holophyly of this taxon is supported by a real autapomorphy - initial presence of anus. The name Haemataria is the oldest one and, thus, should be used as valid one, in spite of the fact that id does not reflect true character.