Family Axiidae Huxley, 1879

AXiidae HuXley, 1879: 785 .— Poore & Collins 2009: 222 (diagnosis, synonymy).—Poore 2017: 364–365 (synonymy). Calocarididae Ortmann, 1891: 47 .

EiconaXiidae Sakai & Ohta, 2005: 69 .

EiconaXiopsididae Sakai, 2011: 289 –291.

NeoaXiidae Sakai, 2017: 504 . Syn. nov.

Remarks. We follow the family diagnosis of Poore & Collins (2009) and synonymy of Poore (2017) rather than those of Sakai (2011). The synonymy of Neoaxiidae Sakai, 2017 is justified in the discussion of the species Guyanacaris caespitosa (Squires, 1979), below.