Calverteca, Godfrey & Feldmann & Schweitzer, 2024

Genus Calverteca gen. nov.

zoobank.org/ A6694AAB-B375-4290-8E31-F54D6E63EC39

Type species. Calverteca osbornei new species (based on a body impression preserved in CMM-V-11695), by original designation.

Etymology. The genus name is derived from the Calvert Formation, from which it was collected, and the ending -eca, as in some of the genera in the family. The gender is feminine.

Diagnosis. Small size, about 17 mm long and ca. 10 mm wide at pereonite 6. Cephalon missing, apparently positioned in advance of pereonite 1 and not enveloped by it. Pereonites increase in width from pereonite 1 to 6 and narrowing to pereonite 7. Pereonite 1 longest; length of pereonites 2- 7 increasing posteriorly. Coxal plates exposed laterally on pereonites 5-7. Pleon markedly narrower than pereon. Pleonites 1-5 equally long and decreasing in width posteriorly. Pleotelson broad anteriorly and broken and missing posteriorly. Pleopods long, blade-like.

Remarks. This is the first notice of a member of Cymothoidae in the fossil record (Smit et al., 2014). Members of Cirolanidae , in the same infraorder, have a fossil record ranging from the Early Jurassic to Holocene (Poore and Bruce, 2012; Maguire et al., 2018; Schram and Koenemann, 2021). Members of the same superfamily, Cymothooidea , are known from the Late Jurassic to Holocene (Schram and Koenemann, 2021).