Clausophyidae Totton, 1965

Grossmann, Mary Matilda & Lindsay, Dhugal John, 2017, A new species of clausophyid calycophoran siphonophore (Cnidaria: Hydrozoa), Kephyes hiulcus sp. nov., widely distributed throughout the world's oceans, Zootaxa 4250 (1), pp. 43-54 : 44

Family Clausophyidae Totton, 1965

Diagnosis. Calycophorae with dissimilar nectophores, typically two, both possessing a somatocyst and with anterior nectophore partially apposed to and partially linearly adjoined to the elongate posterior one; atypically only anterior one developed (genus Heteropyramis ). Nectophore(s) either with longitudinal ridges or smooth; mouthplate absent in anterior nectophore (except in Clausophyes laetmata ), present or absent in posterior nectophore; somatocyst in both nectophores typically simple, swollen, and reaching anterior end of nectophore. Cormidia with bracts, except in genera Clausophyes (eudoxids not developed) and Crystallophyes (produces a unique sexual stage termed the fuseudoxid); bract with phyllocyst variously shaped, with two fine basal branches (bracteal canals) extending down into neck-shield.