Moths of North Carolina
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150 NC Records

Apoda biguttata Packard, 1864 - Shagreened Slug Moth

Taxonomy
Superfamily: Zygaenoidea Family: LimacodidaeP3 Number: 660027.00 MONA Number: 4669.00
Comments: This is one of five members of the genus that occur in North America, three of which occur in North Carolina. This species was formerly placed in the genus Cochlidion.
Identification
Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)Online Photographs: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLDTechnical Description, Adults: Forbes (1923)Technical Description, Immature Stages: Dyar, 1897b; Wagner (2005)                                                                                 
Adult Markings: In this species the antennae are brown and the head, palps, and thorax vary from creamy white to light brown. The distal half of the forewing is occupied by a broad "Y" shaped mark that is filled with brown to brownish gray scales and margined on all sides with a wide whitish line. The proximal half of the forewing is light brown with a diffuse longitudinal cream-colored streak that extends from the base of the middle of the wing to the Y-shaped mark described above. The other conspicuous marks are a chestnut-colored, tear-dropped shaped mark at the apex and a similarly-colored spot at the anal angle that is smaller and more rounded, and nested within the "V" of the "Y" shaped mark. Individuals often rest with the abdomen raised and curled forward above the wings. The abdomen is brown with whitish stripes along the sides that match those of the Y-shaped mark on the forewing. Together, they appear to act as disruptive coloration that breaks up the outline of the body. Apoda biguttata is most similar in appearance to the dark form of A. y-inversum, but the "Y" on that species is dark brown and bordered by dark lines. The length from the tip of head to the apex of forewing at rest averages 12 mm (n = 7).
Wingspan: 25-30 mm (Forbes, 1923)
Adult Structural Features: In this species the antenna of the male is simple and the palps barely reach the vertex. In both sexes the costa of the forewing is nearly straight, the apex is square rather than rounded, and there are four spurs on each hind tibia (Forbes, 1923).
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: The slug-like larvae feed on several taxa of deciduous hardwoods, particularly oaks. Dyar (1897b) noted that females in New York lay their eggs singly on the lower branches of oaks. The eggs hatch in 7-8 days, and there are six or seven instars. The younger instars skeletonize the undersides of leaves in patches, while the older larvae consume the entire leaf. Many populations appear to be univoltine, with the final instar spinning a tough, brownish, rounded cocoon with a texture that resembles cardboard. Overwintering occurs on the ground in the cocoon, and presumably in the prepupal stage, with the adult emerging after the spring leaf-out from a lid-like structure on the cocoon.

The later instars have smooth, pale bluish-green to whitish-green bodies. The dorsolateral region has a broad, yellowish, longitudinal line that is edged with dark green on the inner margin, and extends the entire length of the body. The posterior end bears a short, squared-off tail (Dyar, 1897b; Wagner, 2005). The fully grown larvae are 9.5-12 mm in length.
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants.
Distribution in North Carolina
Distribution: Apoda biguttata occurs throughout much of the eastern US and adjacent regions of southern Canada (Ontario; Quebec; New Brunswick; Nova Scotia). In the US the range extends from Maine southward to Florida, and westward to central Texas, central Oklahoma, Missouri, Iowa and Minnesota. This species occurs statewide in North Carolina from the barrier islands to the higher elevations in the Blue Ridge.
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

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