Native
FWL: 8.0-10.5 mm (males); 9.0-12.0 mm (females)
Adults are brown to blackish gray with indistinct markings. A conspicuous white dot is present on the distaldistal:
farthest from body, distant from point of attachment
one-third of the forewing. Males lack a forewing costal foldforewing costal fold:
a flap or fold at the base of the forewing that contains specialized sex scales
and have distinctive sex scaling on the dorsaldorsal:
upper, to the top, on the back 
surface of the abdomen. The hindwing is brown.
Male genitalia are characterized by the absence of an uncusuncus:
a sclerotized process which is fused to the posterodorsal margin of tergum IX
, a large but undifferentiated cuculluscucullus:
the distal portion of the male valva
, and a short row of about 25-30 deciduous cornuticornuti:
spines used to anchor the male vesica in the female bursa during copulation 
in the vesica. Female genitalia are characterized by a cestumcestum:
a long, bandlike sclerotization of the wall of the ductus bursae
in the ductus bursaeductus bursae:
a membranous tube connecting the ostium bursae to the corpus bursae
that is closer to the ductus seminalis than the ostiumostium:
see ostium bursae 
and two large, horn-like signasigna:
plural of "signum"
in the corpus bursaecorpus bursae:
a dilated membranous sac at the anterior end of the bursa copulatrix
.
Although not described, larvae are assumed to be similar to other species in the Cryptophlebia-Ecdytolopha group, with an enlarged L-pinaculum on the prothoraxprothorax:
the most anterior thoracic segment
that extends beneath (and usually beyond) the spiracle.
Males can be separated from those of Gymnandrosoma aurantianum by sex scaling on the dorsaldorsal:
upper, to the top, on the back surface of the abdomen and differences in genitalia. Two other species of Gymnandrosoma, G. linaresensis and G. cryptotortanum, have similar scale structures on the abdomen, but these species only occur in Mexico.
Little is known regarding the life cycle of this species. Collection records suggest multiple generations per year. In the midwestern U.S., adults are present in May through September. In Florida and southern locations, adults may be present year-round.
Larvae of Gymnandrosoma punctidiscanum have been recorded feeding on locust and red oak.
| Host plant | Host plant family | Reference(s) |
| Robinia sp. | Fabaceae | Prentice 1966Prentice 1966: Prentice, R. M. 1966. Vol. 4. Microlepidoptera. In : Forest Lepidoptera of Canada recorded by the Forest Insect Survey. Dept. For. Canada Publ. 1142: 543-840. |
| Quercus rubra | Fagaceae | Adamski & Brown 2001 |
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Gymnandrosoma punctidiscanum is distributed from Massachusetts and southern Ontario west to Wisconsin and south to Florida and Texas.
