Cyclaspis triplicata Calman 1907

Diagnosis. Female. Carapace without pitting or reticulation, with 3 oblique ridges on the carapace, joining ventrally and continuing to the anterior margin of the carapace, ventral to the antennal notch, with a tubercle at the midpoint of the pseudorostral suture acting as the origin of the anteriormost oblique ridge; 0.7 times as high as long; eyelobe with lenses; antennal notch present; anteroventral corner acute. Pereonite 1 visible laterally. Pereonite 2 expanded dorsally, not as tooth, overhanging pereonite 3. Pleon with lateral articulating pegs. Uropod peduncles longer than pleonite 6; endopod subequal to exopod; endopod with single stout medial seta; exopod with few plumose setae medially. Male. Carapace less arched than in female, 3 oblique ridges present but do not join ventrally, with tubercle at origin of pseudorostral suture acting as origin of anteriormost ridge. Pereonite 1 not visible. Pereonite 2 produced dorsally as anteriorly directed blunt tooth. Uropod endopod with plumose setae proximally and short stout setae distally.

Remarks. This species is unique in the New Zealand fauna in having 3 oblique ridges on the carapace, as denoted in the name triplicata . The most similar species is C. argus; however, C. argus has only 2 oblique ridges, both posterior to the origin of the pseudorostral suture. In comparison, C. triplicata has 3 oblique ridges, the anterior most ridge ventral to the pseudorostral suture.