A dichotomous key to the genera of the Marine Heterotardigrades (Tardigrada) Author Fontoura, Paulo Author Bartels, Paul J. Author Jørgensen, Aslak Author Kristensen, Reinhardt Møbjerg Author Hansen, Jesper Guldberg text Zootaxa 2017 4294 1 1 45 journal article 32663 10.11646/zootaxa.4294.1.1 4e098c30-d7f2-49d2-9d71-4a2815d76e06 1175-5326 831540 F7EC0547-6984-4C85-B1BF-010C049D0F2D 1.7 STYGARCTIDAE Schulz, 1951 (emended by Hansen et al . 2012 ) Arthrotardigrada with dorsal cuticle forming five dorsal plates (one cephalic plate; three body plates – segmental plates I, II and III – and one caudal plate – segmental plate IV). Dorsal plates sometimes absent. Intersegmental dorsal plates and ventral plates may be present. Head subdivided into lobes; complete set of cephalic cirri and two pairs of clavae. Stylet supports always absent. Legs non-digitate with four, three or two claws. Claws with or without dorsal spurs or long dorsal filaments34; claws attached with dorsal basal membrane. Leg sense organs present only on the fourth pair of legs, as bulb-shaped papillae. Seminal receptacles formed as cuticular pouches with short straight ducts or with long sinuous ducts close to the female gonopore. Selected literature for further information: A key to the Stygarctidae can be found in Morone De Lucia et al. (1984).