MICROHYPSIBIIDAE Pilato, 1998, Pilato, 1998

Pilato, Giovanni & Binda, Maria Grazia, 2010, Definition of families, subfamilies, genera and subgenera of the Eutardigrada, and keys to their identification, Zootaxa 2404, pp. 1-54: 43

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http://doi.org/ 10.5281/zenodo.194138

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Minute eutardigrades without cephalic papillae. A paired elliptical organ may be present on the head ( Fig. 6 View FIGURE 6 ). Diploclaws asymmetrically arranged with respect to the median plane of the legs (conventionally described as: 2121). The claws, of the Microhypsibius   type, have a narrow basal section continuous with the primary branch; the secondary branch is rigidly joined to the primary branch at a distance from the base of the claw ( Figs. 1 View FIGURE 1 C, 24 A). The bucco-pharyngeal apparatus in the known genera has a rigid tube, without ventral lamina, but asymmetrical with respect to the frontal plane due to the differences in the shape between the dorsal and the ventral apophyses for the insertion of the stylet muscles ( Fig. 24 View FIGURE 24 B –D). Both these apophyses have two very thin caudal processes pointing backwards and sideways. Peribuccal lamellae, and probably also peribuccal papulae, absent in the known species.

Composition: Only two genera are ascribed to the family: Fractonotus   and Microhypsibius   .