Xenocarida

Xenocarida (from the Greek for strange shrimp) is a proposed clade inside the subphylum Crustacea that comprises two classes that were discovered in the 20th century: Remipedia and Cephalocarida. Both groups are marine hermaphrodites.^[1][2] The clade was recovered as the sister groups to Hexapoda (including insects).^[3]

Xenocarida
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	Allotriocarida
Clade:	Xenocarida Regier et al., 2010
Classes
Cephalocarida Remipedia

However, other studies do not recover Xenocarida as a monophyletic group^[4][5] and variously find Branchiopoda or Remipedia as the hexapod sister group^[6][7][4][5]