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HelenCross
wrote:
12 Sep 2024
Thanks for the interesting discussion about sawfly larvae!
Perga sp. (genus)
samreid007
wrote:
12 Sep 2024
Let me know @MichaelMulvaney if you want me to have a pass through all the sawfly larvae ID's and classify them on a more conservative basis (e.g. Perga affinis and dorsalis go to Perga sp., other ones go to subfamily, etc). And sorry I haven't been doing much identification work lately! I'll try and get back into it.
Perga sp. (genus)
MichaelMulvaney
wrote:
12 Sep 2024
Thanks Sam
I think we will leave the black larvae with white hairs as Perga and I will check that others are ID to Perginae
Cheers Michael Mulvaney
I think we will leave the black larvae with white hairs as Perga and I will check that others are ID to Perginae
Cheers Michael Mulvaney
Perga sp. (genus)
samreid007
wrote:
11 Sep 2024
Hi @MichaelMulvaney, sawfly large in Perginae are definitely hard to get to species / genus as there are very few peer reviewed studies that have looked at them. As such, lot's of the information out there is anecdotal. However, that said, there are a few things that would make me lean towards Perga for this sighting (probably affinis or dorsalis).
1. Based on some searches a few years ago, the Perginae that are most commonly recorded in the ACT and nearby are Perga affinis, Perga dorsalis, Pergagrapta polita, Pergagrapta spinolae, Pseudoperga guerinii, and Pseudoperga lewisii. Fewer records exist for Cerealces scutellata, Xyloperga forsiusi, Pergagrapta latreilliid, Pergagrapta turneri, Pseudoperga ferruginea.
2. The record is from July, and the larvae are mid to late instar - this would fit with Perga affinis as the larval stages occur over autumn and winter. It could also fit with Perga dorsalis, as it can be found as larvae all year (however, the late instar stages are more often in spring and summer). I think most other Pergagrapta and Pseudoperga that occur around here are generally late instar in spring, summer, and early autumn.
3. The colour of the body, prolegs, and uropod (tail) is right or Perga affinis or dorsalis, as are the robust short and white bristles (hairs). As far as I know, the other common Perginae around here don't look like that.
Based on the above, I'd say Perga affinis or dorsalis. However, @NKingsford makes some very good points. It would be great to have an entomologist look through our sawfly larvae records and identify any issues. I wouldn't be surprised if they recommended ID-ing to only genus or subfamily.
1. Based on some searches a few years ago, the Perginae that are most commonly recorded in the ACT and nearby are Perga affinis, Perga dorsalis, Pergagrapta polita, Pergagrapta spinolae, Pseudoperga guerinii, and Pseudoperga lewisii. Fewer records exist for Cerealces scutellata, Xyloperga forsiusi, Pergagrapta latreilliid, Pergagrapta turneri, Pseudoperga ferruginea.
2. The record is from July, and the larvae are mid to late instar - this would fit with Perga affinis as the larval stages occur over autumn and winter. It could also fit with Perga dorsalis, as it can be found as larvae all year (however, the late instar stages are more often in spring and summer). I think most other Pergagrapta and Pseudoperga that occur around here are generally late instar in spring, summer, and early autumn.
3. The colour of the body, prolegs, and uropod (tail) is right or Perga affinis or dorsalis, as are the robust short and white bristles (hairs). As far as I know, the other common Perginae around here don't look like that.
Based on the above, I'd say Perga affinis or dorsalis. However, @NKingsford makes some very good points. It would be great to have an entomologist look through our sawfly larvae records and identify any issues. I wouldn't be surprised if they recommended ID-ing to only genus or subfamily.
Perga sp. (genus)
Land area
194.43
ha
ha
Survey effort
2.15
sightings per ha
sightings per ha
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