Delta Geometrid at Melba, ACT
Identification history
| Isturgia penthearia | 31 Jan 2021 | donhe | ||
| Isturgia penthearia | 31 Jan 2021 | ibaird | ||
| Unidentified | 25 Jan 2021 | kasiaaus |
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8 comments
kasiaaus
wrote:
25 Jan 2021
I think this might be Epidesmia perfabricata. The colour matches better and the hind wings on this one showed no orange.
ibaird
wrote:
25 Jan 2021
I considered E perfabricata too, but I wasn't convinced given the shape and position of the main forewing line, which seemed to me to match E. chilonaria better.
kasiaaus
wrote:
26 Jan 2021
I wonder if you could have another look (I added two more photos that you may not have seen). The third photo shows a bit of the underwing and there is no orange. It was also quite a fresh moth and not a worn one.
ibaird
wrote:
26 Jan 2021
This is a male judging by the antennae. Referring to the underwing pattern for E. chilonaria given by Moths of Victoria on their supporting disc (Part 4), there is orange on the top side of the hindwing but not on the bottom side of the hindwing. There is also orange on the underside of the forewing and a conspicuous black blotch provided the plain hindwiing is not obscuring the yellow forewing underside. On the underside of the forewing the entire wing is not yellow, the wing near the costa and almost a third of forewing towards the tip remains plain. Similarly, the entire top side of the hindwing is not yellow the trailing edges are plain and a large are toward the tornus of the hindwing (normally exposed when the moth is at rest) also remains plain. I think its entirely plausible that the yellow of the hindwings for E. chilonaria is invisible in your photos because it is obscured by overlapping forewings or hindwings. Also there are clear dots along the forewing mainline topside in E. perfabricata and along its forewing hindmargin which appear to be absent here. Nevertheless, to attract a third moderator's opinion on this identification I will add the ID of Epidesmia (genus) to reflect the uncertainty.
donhe
wrote:
26 Jan 2021
The hindwing tornal area of E. chilonaria is brown, and consistent with your 3rd photo.
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Nearby sightings
Location information
- Coordinates 149.050443-35.209015
- Altitude 498.2m
- Places Melba, ACT
Sighting information
- 1 - 3 Abundance
- 17 Jan 2021 01:16 AM Recorded on
- kasiaaus Recorded by
Additional information
- 25mm to 50mm Animal size
Species information
- Isturgia penthearia Scientific name
- Delta Geometrid Common name
- Not Sensitive
- Local native
- Non-Invasive
- Up to 626.76m Recorded at altitude
- Machine learning
- External link More information
Record quality
- Overall Fit for scientific/research use
- Images or audio
- More than one media file
- Confirmed by an expert moderator
- Nearby sighting(s) of same species
- GPS evidence of location
- Description
- Additional attributes
