Journal archives for August 2022

August 29, 2022

Notes on Sicya crocearia & Sicya macularia

I'm trying to figure out what distinguishes Sicya crocearia from Sicya macularia. It seems that there may not be any visual cues that clearly distinguish the two species in their adult forms.

Online Reference Comparison

Sicya crocearia

Usual online references:

Sicya macularia

Usual online references:

Notes

  • A quick glance at two DNA barcode, one for each species. They were identical.
  • Between the two sets in the C.P. Gillette Museum's collection where images are available, there might be a small difference: Among the specimens labelled S. crocearia the following features appear unique to the set, although not present in all examples:
  • 1. Forewing: Sharper discontinuity in the terminal band, where it transitions from reddish brown to yellow perpendicular to the length of the wing.
  • 2. Forewing: The terminal band widens more at the costa.
  • 3. Forewing: Inner reddish brown band widens more at the inner edge.
  • (Only the 3rd feature seems consistent with the MPG photos.)

References

Pohl 2018

Suggests that S. crocearia might not be a distinct species:

Sicya Guenée, 1857

crocearia Packard, 1873 (Sicya)

NOTE: This taxon may not be sufficiently distinct from S. macularia to warrant status as a separate species, but it is retained here pending further work.

VNHS Blog

The problem with Sicya is that there seems no general agreement as to whether S. macularia and S. crocearia are truly separate species, or whether they should be lumped as one. Jeremy Tatum writes: Unlike the case for iridopsis, I have no opinion one way or the other. In looking at published pictures of aduilts [sic] and larvae, I see conflicting evidence. In the adults, there seems to be no consistent reliable feature for telling one from the other, so I would say they are all one species. On the other hand, there seem to be two distinct caterpillars, suggesting that they are separate species. I’ll label Jochen’s moth with an either/or.

Sicya macularia/crocearia (Lep.: Geometridae) Jochen Möhr

Source: "July 16 evening" (blog post), Victoria Natural History Society, Victoria, British Columbia.

LepIndex

Original Descriptions


Sicya macularia Harris 1850

Ennomos macularia, 1850

  • forewings: rust-brown costal spot near the shoulders
  • a transverse row of spots near the base
  • a stigmatical dot
  • three little spots near the tip
  • a very large lozenge-shaped spot at the anal angle, of the same brown color
  • the large spot being bordered before and behind with darker brown


Sicya crocearia Packard 1873

Posted on August 29, 2022 05:38 by murphyslab murphyslab | 0 comments | Leave a comment

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