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Siamese Peninsula Pit Viper
   
   

Family : VIPERIDAE
Species :  Popeia fucata
Maximum Size : 86 cm

The 'Siamese Peninsula Pit Viper' Popeia fucata was first acknowledged as a separate species in 2004, prior to which it was considered a variant of Pope's Pit Viper (formerly Trimeresurus popeiorum). 

There is significant local variation in patterning. A dual stripe (white over red) generally extends along each flank (i.e. a dorsolateral stripe), though in some specimens the red stripe may be absent and in others both stripes may be absent.

Red-over-white postorbital stripes (i.e. those immediately behind the eye) occur in many specimens, but in others this feature too may be entirely absent. (In some populations this  feature may occur exclusively in males, though this is not certain).

Regular, dark banding may occur over the back, but this is generally very faint. The tail is reddish brown, sometimes banded, and the belly pale green. Iris colour may vary from orange-red to yellow to green.

The scales of this species are matte - note the lack of reflected light under flash photography.

Grismer et al (2006) graphically illustrated the variation in patterning of this species on Pulau Langkawi, Peninsular Malaysia.

This stunning pit viper occurs in southern Thailand and Peninsular Malaysia, with an apparent stronghold on Pulau Langkawi.
 

Figs 1 and 2 : Adult specimen found resting on a sapling in lowland forest at Datai Bay, Pulau Langkawi, northern Peninsular Malaysia. Note the well-developed red and white stripes behind the eye and along the flanks, and faint brown banding across the body.

Fig 3 : Specimen from Fraser's Hill, Peninsular Malaysia at 1000 metres elevation, with lateral red and white stripes but no facial markings.

Fig 4 : Adult specimen from Gunung Tiong, Endau-Rompin, southern Peninsular Malaysia at an elevation of around 600-700 metres. Note the absence of any form of stripe or banding, except possibly for a faint pale dorsolateral stripe.  Photo thanks to Goh Si Guim.

Fig 5 : Specimen from Gunung Belumut, Johor, southern Peninsular Malaysia (elevation unknown). This snake (which appears to be digesting a meal) has a white ventrolateral stripe and a reddish-brown, banded tail. This may represent the southernmost record of the species to date. Photo thanks to Joseph Lim.


References :

Grismer, L., Youmans, T., Wood, P., Ponce, A., Wright, S., Jones, B., Johnson, R., Sanders, K., Gower, D., Yaakob, N., Lim, K. P. 2006. Checklist of the herpetofauna of Pulau Langkawi, Malaysia with comments on taxonomy. Hamadryad Vol 30. Nos. 1 & 2, pp. 61-74.

 

Fig 1
 
Fig 2
 
Fig 3
 
Fig 4
 
ゥ  Goh Si Guim
Fig 5
 
ゥ  Joseph Lim