Varanus rainerguentheri was described in 2007 (Ziegler, Böhme & Schmitz) from a live animal as well as a museum specimen originally identified as Varanus indicus. With the description of this species and the absence of any reliable specimens of indicus from Halmahera, the presence of Varanus indicus s. str. on this island needs to be reconfirmed.
Rainer Günther’s monitor inhabits saltwater environments including coastal areas, mangroves, and Nypa palm swamps (Weijola 2010).
Background color: Greyish-black
Dorsal pattern: Blackish ocelli with yellow centers, arranged in transverse rows
Tail pattern: Transverse rows of ocelli as on the dorsum; banded towards the tip
Throat/ventral pattern: Ventral surface cream to greyish; throat unpatterned; ventral surface possessing faint bands (Note: Due to questions regarding the origin of the holotype, there is still debate as to exactly what constitutes Varanus rainerguentheri; see Weijola 2010. The description given here is that of the holotype as given in the species’ description)
Post-ocular stripe: Present, though this feature varies widely among individuals (Weijola 2010)
Tongue color: Pink with a dark grey tip
Currently known to occur throughout Halmahera as well as on Morotai, Ternate, Tidore, Gebe, Bacan, Kasiruta, and Obi (Weijola 2010). Its range has recently been expanded to include Buru (Somma & Koch 2012) and is likely even more widespread in the Moluccas.
Originally recognized as an unknown indicus-type animal, an examination of similar museum specimens (Somma & Koch 2012) has identified these specimens as likely juvenile rainerguentheri. No information available concerning specific locality. Photos courtesy of Firdaus Karim.
Note barred throat which necessarily distinguishes it from Varanus indicus sensu stricto. This specimen is also pictured in Somma & Koch 2012.
Note a strong resemblance to the photograph of a suspected juvenile Varanus rainerguentheri which appears in Ziegler et al 2007.
Somma, M. & A. Koch (2012): New morphological and distributional data of Varanus rainerguentheri Ziegler, Böhme & Schmitz, 2007 (Squamata: Varanidae), an endemic and little-known monitor lizard species of the Moluccas, Indonesia. Salamandra 48: 207-212.
Weijola, V. S. A. (2010): Geographical distribution and habitat use of monitor lizards of the north Moluccas. Biawak 4 (1): 7-23. (http://www.varanidae.org/Vol4_No1.pdf)
Ziegler, T., Böhme, W. & A. Schmitz (2007): A new species of the Varanus indicus group (Squamata, Varanidae) from Halmahera Island, Moluccas: morphological and molecular evidence. Mitt. Mus. Nat.kd Berlin, Zool. Reihe 83 (2007) Supplement, 109-119.