Type species. Winlundia filistoma Newell, 1984.
Adults. In female and male GP and AP fused. Female GA with three pairs of pgs, genital sclerites with two pairs of sgs (Newell 1984: fig. 526). Ovipositor at rest slightly extending beyond GO. Number and shape of internal gac and genital spines not known. Male GA with 10–20 pairs of slender pgs, genital sclerites with three to five pairs of small sgs (Newell 1984: figs 540, 545). Epimeral pores not mentioned in the descriptions.
Juveniles. Deutonymph with GP and AP separated. GP with two pairs of pgs, two pairs of minute sgs and two pairs of internal gac (Newell 1984: figs 536, 537). Any other nymphal stage and larva not known.
Remarks. Two species are described, both are from South America, extracted from shallow water sandy deposits (Newell 1984).