View Full Version : Is Prosotas pia pia present in Singapore ?

08-May-2013, 12:34 AM
Prosotas nora & pia are 2 very similar species.

In C&P4 the key states that in pia the HW submarginal markings are narrower & tending to fade out.
This means there is a great deal of variation in the degree of fade of the submarginal markings.

Typically images of pia shows the submarginal markings almost washed out like this example from Fraser's Hill, but this may not always be the case.

The fade is difficult to judge as nora also tend to have the submarginal markings looking faded.
Fade is best noted by comparing the degree of blackness of the markings with the dark striae of the adjacent postdiscal bands on both wings.
Typically the submarginal markings on the HW are sharper.

Here is a nora pair.
Note the female have strong markings.
The male have the FW submg. markings looking a bit faded (partly due to wear), but on the HW the markings are as dark as the dark striae.

Here is another pair from Singapore.
Note the pristine female have totally washed-out submarginal markings. This has to be Prosotas pia.
The male have more fade comparing with the dark striae than the nora male above.

Finally a male taken by Federick in CCA 2009.
This shows considerable fade of the submarginal markings on both wings by comparing with the dark striae of the postdiscal bands.

TL Seow:cheers:

21-Apr-2020, 07:43 PM
I've always wondered why all these so-called "nora" show such inconsistencies in markings (beyond individual variation).

Now that i've spent some time looking through most of the iNat records, here's two more that i find particularly intriguing:

This one (https://www.inaturalist.org/observations/10239620) i'm pretty sure is pia because of the faded out submarginals and also the general appearance of the striae looks too different from any nora. That said, it doesn't quite match the female pia above

This other one (https://www.inaturalist.org/observations/30588995) might also be pia. It's in pristine condition and the submarginals look different from the more worn-out examples of nora that have been posted before

22-Apr-2020, 01:18 AM
Still too difficult to be certain without someone setting a series of pia specimens for comparison.

TL Seow: Cheers.