Moths of North Carolina
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View PDFGeometridae Members: 31 NC Records

Idaea ostentaria (Walker, 1861) - Showy Wave Moth



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Taxonomy
Superfamily: Geometroidea Family: GeometridaeSubfamily: SterrhinaeTribe: SterrhiniP3 Number: 910530.00 MONA Number: 7121.00
Comments: One of thirty species in this genus that occur in North America north of Mexico (Pohl et al., 2016). Thirteen have been recorded in North Carolina.
Identification
Field Guide Descriptions: Online Photographs: MPG, BugGuide, iNaturalist, Google, BAMONATechnical Description, Adults: The only published account we were able to find was Walker's original description (Walker, 1861).                                                                                  
Adult Markings: As described by Walker (1861, as Acidalia ostentaria), this species has a grayish white ground color, speckled with black. As in several other members of the Sterrhini, the head is blacksh except for inter-antennal bar. The wings are "hardly elongated", with the forewings "rectangular at the tips: and the "hind part of the exterior border rather oblique". Both the antemedian and postmedian lines are irregular, black, and very distinct, while the median and subterminal lines are usually indistinct; the postmedian, in particular is often represented by a series of black points that are sometimes connected to form a more continuous, if heavily accented line. The discal dots are also black, somewhat pointed, and fairly large. A series of cinerous (ashy gray) lunules runs along the margins of the wings (forming a broken adterminal line), with a series of black marginal points situated in between the lunules and located closer to the margin. Several other members of the Sterrhini are similar in size and color, with Lobocleta ossularia probably the most likely to be confused with ostentaria in our area, with its whitish-gray ground color and an undulating postmedian line composed of separate points. Ossularia, however, has a more elongated and pointed forewing and typically does not have the alternating marginal rows of lunules and dots that are characteristic of ostentaria. Ossularia also often has a diffuse gray median line that is usually missing or poorly developed in ostentaria.
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: Larvae do not appear to have been described
Distribution in North Carolina
Distribution: Appears to be restricted to the southern half of the Coastal Plain in North Carolina, including the Fall-line Sandhills
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)

Click on graph to enlarge
Flight Comments: Probably bivoltine in North Carolina, flying in the late spring and again in late summer
Habitats and Life History
Habitats: Kons and Borth (2006) consider this species to be a specialist on xeric oak-pine scrub in Florida, which is consistent with our observation of this species: virtually all North Carolina records come from Coastal Fringe Sandhills or Xeric Sandhill Scrub communities, including some of the most xeric sand barrens we have sampled in the state.
Larval Host Plants: Host plants appear to be unknown (Heppner, 2007).
Observation Methods: Appears to come well to blacklights
Wikipedia
See also Habitat Account for Xeric-Mesic Sand Barrens and Glades
Status in North Carolina
Natural Heritage Program Status: SR
Natural Heritage Program Ranks: GNR S2S3
State Protection: Listed as Significantly Rare by the Natural Heritage Program. That designation, however, does not confer any legal protection, although permits are required to collect it on state parks and other public lands.
Comments: Although this species does not appear to be hard to collect in the right habitat, North Carolina records come from fewer that 10 sites, all located within the southern part of the Coastal Plain. Ostentaria seems to be a strong habitat specialist, occurring almost solely within fairly large tracts of Xeric Sandhill Scrub or similar dry-xeric sandhill communities. Although too dry and sandy to have been cultivated much in the past, sandridge habitats continue to be converted to tree farms, golf courses, or developments. The coastal sand ridges where most of our records come from are particularly threatened due to waterfront development and are also vulnerable to the effects of sea-level rise.

 Photo Gallery for Idaea ostentaria - Showy Wave Moth

Photos: 1

Recorded by: Bo Sullivan on 2016-06-02
Carteret Co.
Comment: wingspan = 18 mm; forewing length = 9 mm