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Ptyctolaemus collicristatus SCHULTE & VINDUM, 2004

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Higher TaxaAgamidae (Draconinae), Sauria, Iguania, Squamata (lizards)
Common Names 
SynonymPtyctolaemus collicristatus SCHULTE & VINDUM in SCHULTE, VINDUM, WIN, THIN, LWIN & SHEIN 2004
Ptyctolaemus gularis — SHREVE 1940: 24
Ptyctolaemus collicristatus — MANTHEY 2010 
DistributionW Myanmar (Chin Hills, Burma)

Type locality: Myanmar, Chin state, Min Dat district, Min Dat township, 21° 22’ 20.1’’ N, 93° 58’ 34.6’’ E, 1.482 m elevation.  
TypesHolotype: CAS 227489 
DiagnosisDIAGNOSIS AND COMPARISONS. The only clear character that distinguishes the genus Ptyctolaemus from other genera of the subfamily Draconinae (sensu Macey et al. 2000) or Group V agamids (sensu Moody 1980) of mainland southeast Asia is that the males of P. gularis have longitudinal gular folds on either side of the midline with the posterior portion of the folds curving medially on each side of the throat. However, these folds are only evident when the gular pouch is in a relaxed position (as in preserved specimens). The folds are formed when the gular pouch is relaxed in an accordion-like fashion, the folds become more pronounced because the scales within the folds are darkly pigmented.
The only other southeast Asian species with gular folds is Mantheyus phuwuanensis, however it has rounded “U”-shaped folds encompassing the gular sac. M. phuwuanensis also differs from Ptyctolaemus and all other draconines by the presence of femoral pores (Ananjeva and Stuart 2001).

Ptyctolaemus collicristatus can be distinguished from P. gularis by having a more prominent nuchal crest comprised of larger, flattened, triangular, scales, consisting of fewer scales in adult males (15–16 versus 17–30 scales); a shorter tail, with an average TailL:SVL ratio of 1.99 versus 2.24; stouter and shorter limbs; and more heterogeneity among dorsal and lateral scales [from SCHULTE et al. 2004].

SEXUAL DIMORPHISM. The main external morphological difference between males and females is the distinct gular pouch in males whereas in females the pouch is absent, although faint gular folds are still present. Males also have a more developed, higher, nuchal crest (SCHULTE et al. 2004). 
EtymologyNamed after Latin “collum” meaning neck and “cristatus” meaning crested, referring to the nuchal crest. 
  • ANANJEVA, N. B. & STUART. B.L. 2001. The agamid lizard Ptyctolaemus phuwuanensis MANTHEY AND NABHITABHATA, 1991 from Thailand and Laos represents a new genus. Russ. J. Herpetol. 8 (3): 165-170 - get paper here
  • Manthey U 2010. Agamid Lizards of Southern Asia. Draconinae 2 -Leiolepidinae. Edition Chimaira, Terralog 7b, Frankfurt, 168 pp.
  • Moody,S.M. 1980. Phylogenetic and historical biogeographical relationships of the genera in the family Agamidae (Reptilia: Lacertilia). PhD thesis, Univ. Michigan, Ann Arbor, 373 pp.
  • Schulte II, J. A., J. V. Vindum, H. Win, T. Thin, K. S. Lwin & A.K. Shein 2004. Phylogenetic relationships of the genus Ptyctolaemus (Squamata: Agamidae), with a description of a new species from Chin Hills of Western Myanmar. Proc. Cal. Acad. Sci., 55(12): 222-247 - get paper here
  • Shreve,B. 1940. Reptiles and amphibians from Burma with descriptions of three new skinks. Proc. New England zool. Club 18: 17-26
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