Hymenocarina

Hymenocarina; Temporal range:
	Diagram of Waptia
	Fossil of Canadaspis perfecta
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Mandibulata
Order:	†Hymenocarina; Størmer, 1944
Genera
	Balhuticaris; Canadaspis; Ercaicunia; Fibulacaris; Jugatacaris; Nereocaris; Odaraia; Pakucaris; Perspicaris; Plenocaris; Synophalos; Xiazhuangocaris; Pectocaris; Clypecaris; Vermontcaris; ?Forfexicaris; ?Occacaris; ?Yunnanocaris; ?Erjiecaris; ?Pseudoarctolepis; Tuzoiidae Tuzoia; Duplapex; ; Protocarididae Tokummia; Branchiocaris; Protocaris; Loricicaris; ; Waptiidae Waptia; Pauloterminus; Synophalos?; ;
Synonyms
	Canadaspidida Novozhilov in Orlov, 1960

Hymenocarina is an order of extinct arthropods known from the Cambrian. They possess bivalved carapaces, typically with exposed posteriors. Members of the group are morphologically diverse and had a variety of ecologies, including as filter feeders and as predators. Recent research has generally considered them to be stem or crown group members of Mandibulata, due to the presence of mandibles in some species.

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[1]

Hymenocarina Temporal range:

Diagram of Waptia

Fossil of Canadaspis perfecta
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Mandibulata
Order:	†Hymenocarina Størmer, 1944
Genera
Balhuticaris Canadaspis Ercaicunia Fibulacaris Jugatacaris^[1] Nereocaris^[1] Odaraia Pakucaris Perspicaris Plenocaris^[1] Synophalos Xiazhuangocaris Pectocaris Clypecaris Vermontcaris ?Forfexicaris^[1] ?Occacaris^[1] ?Yunnanocaris^[1] ?Erjiecaris ?Pseudoarctolepis Tuzoiidae Tuzoia Duplapex Protocarididae Tokummia Branchiocaris Protocaris Loricicaris Waptiidae Waptia Pauloterminus Synophalos?
Synonyms
Canadaspidida Novozhilov in Orlov, 1960