Rehbachiella is roughly 1.7 mm long, with three pairs of cephalic appendages with curved spines pointing towards the mouth and eight to nine pairs of postmandibular appendages roughly identical to each other except for size and exopod length, together forming a filter apparatus. Unusually,
Rehbachiella had over 30 larval stages and the most developed specimens found are still seemingly immature. Its thin carapace covers all limb-bearing segments, however there are five limbless segments extending past it, the most posterior bearing a furca alongside two protrusions that resemble undeveloped appendages.
Rehbachiella has two compound eyes similar to its larval stages, as well as a large labrum. As many of its traits resemble those of Branchiopoda, it is tentatively placed as a stem-group branchiopod and may be a member of stem-
Anostraca alongside
Lepidocaris. == Etymology ==