Hyalarcta nigrescens

Ribbed Case Moth at Ainslie, ACT

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Identification history

Hyalarcta nigrescens	2 Apr 2023	ibaird
Hyalarcta nigrescens	2 Apr 2023	donhe
Lepidoptera unclassified IMMATURE moth	2 Apr 2023	Hejor1

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8 comments

Hejor1 wrote:

2 Apr 2023

@donhe the pinched/diamond/conical shape held firm despite collection, transport, humidity, and the first part of dissection, plus the black and brown specs were pretty symmetrically placed and held fast like they were woven or set in place. It didn’t have the smooth curve like the ribbed case moth cases I’ve seen before and was smaller too.

Hejor1 wrote:

2 Apr 2023

Added another pic of the case

RogerF wrote:

3 Apr 2023

2 different species here.male h.nigrescens with ribbed case and Crypto with sclerotised head shield to close case of crass

donhe wrote:

3 Apr 2023

@Hejor1 : Are we to understand that the black thing with the round brown head in photos 1,2, and 3, came out of the H. nigrescens case shown in photo4? Is the net background the same in both photos 1 and 4, i.e. are photos 1,2, and 3 are at much higher magnification than photos 4 and 5? The black thing does not look much like that in Andy's photo shown in
http://lepidoptera.butterflyhouse.com.au/psyc/nigrescens.html

Hejor1 wrote:

3 Apr 2023

@donhe @RogerF - these are the same organism. The grid is 1mm squares in photos 1-4. I collected the case and waited 4 weeks but it didn’t hatch so I pulled it apart. All specimens taken apart were done one at a time on a clean surface so no intermingling.

Hejor1 wrote:

3 Apr 2023

@RogerF and @donhe i can’t find any ribbed case moth cases which have the shape in this one - they all have a smooth curve.

donhe wrote:

3 Apr 2023

The conical decorated case is typical of early instars of H. nigrescens, see
http://lepidoptera.butterflyhouse.com.au/psyc/nigrescens.html

Hejor1 wrote:

5 Apr 2023

@donhe got it! Good to know!

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