Genus description from Thulin 1928: “Krallen vom ersten Typus. Placoidenreihen des Schlundkopfes verhältnismässig lang, jede aus drei Macroplacoiden zusammengesetzt. Mundröhre nicht besonders eng, beinahe gerade. Körperoberfläche glatt.”
Translated: Claws of the first [Microhysibius] type. Placoid rows of the pharynx relatively long, each composed of three macroplacoids. Buccal tube not particularly narrow, almost straight. Body surface smooth.
Genus description from Pilato 1998: “Microhypsibiidae; cephalic elliptical organ absent; buccal tube rigid; ventral lamina absent; apophyses for the insertion of the stylet muscles asymmetrical with respect to the frontal plane; ventral apophysis in the shape of a ridge with an evident ‘blunt hook’; dorsal apophysis split into two portions: the anterior in shape of ‘semilunar hook’; the caudal portion is a little, short, thickening. Both the dorsal and ventral apophyses with two very slender caudal processes pointing posteriorly and laterally. Peribuccal lamellae and peribuccal papulae absent (?); pharyngeal apophyses and placoids present; the two branches of the furcae of the stylets have thickened, swollen and rounded apices. Lunulae absent in the known species. Smooth eggs laid in the exuviae.”
Citations:
Pilato G. 1998. Microhypsibiidae, new family of eutardigrades, and description of the new genus Fractonotus (Tardigrada). Spixiana. 21 (2): 129-134.
Thulin G. 1928. Über die phylogenie und das system der tardigraden. Zoologisches Institut, Lund.
