Friday, April 6, 2018

[Herpetology • 2018] Species Delimitation in the Gehyra nana (Squamata: Gekkonidae) Complex: Cryptic and Divergent Morphological Evolution in the Australian Monsoonal Tropics, with the Description of Four New Species

(B) G. nana  Storr, 1978

(upper & C) G. paranana & (D) G. pseudopunctata 
Doughty, Bourke, Tedeschi, Pratt, Oliver, Palmer & Moritz, 2018. 


Recent advances in molecular genetic techniques and increased fine scale sampling in the Australian Monsoonal Tropics (AMT) have provided new impetus to reassess species boundaries in the Gehyra nana species complex, a clade of small-bodied, saxicolous geckos which are widely distributed across northern Australia. A recent phylogenomic analysis revealed eight deeply divergent lineages that occur as a series of overlapping distributions across the AMT and which, as a whole, are paraphyletic with four previously described species. Several of these lineages currently included in G. nana are phenotypically distinct, while others are highly conservative morphologically. Here we use an integrated approach to explore species delimitation in this complex. We redefine G. nana as a widespread taxon with complex genetic structure across the Kimberley of Western Australia and Top End of the Northern Territory, including a lineage with mtDNA introgressed from the larger-bodied G. multiporosa. We describe four new species with more restricted distributions within the G. nana complex. The new species are phylogenetically divergent and morphologically diagnosable, and include the relatively cryptic G. paranana sp. nov. from the western Northern Territory, the large-bodied G. pseudopunctata sp. nov. from the southern Kimberley ranges, G. granulum sp. nov., a small-bodied form with granules on the proximal lamellae from the north-west and southern Kimberley ranges and the small-bodied G. pluraporosa sp. nov. restricted to the northern Kimberley. Our revision largely stabilises the taxonomy of the G. nana complex, although further analyses of species limits among the remaining mostly parapatric lineages of G. nana sensu stricto are warranted.

Keywords: Reptilia, Australian Monsoonal Tropics, cryptic speciation, gecko, Gehyra granulum sp. nov., Gehyra multiporosaGehyra paranana sp. nov., Gehyra pluraporosa sp. nov., Gehyra pseudopunctata sp. nov., Kimberley, lizard, Northern Territory, Top End, Western Australia

FIGURE 5. Photos in life of the species described herein.
 A) Gehyra nana (lineage nana2) (NTM R37597) from Bradshaw Field Training Area, NT (S. Mahony), B) G. nana (nanamulti) (WAM R174051) from Drysdale River National Park, WA (R.J. Ellis), C) G. paranana sp. nov. (NTM R37601) from Bradshaw Field Training Area, NT (S. Mahony), D) G. pseudopunctata sp. nov. (not collected) from near Halls Ck, WA (S. Zozaya),  

Gehyra paranana 
photo: Stephen Mahony ‏

Paul Doughty, Gayleen Bourke, Leonardo G. Tedeschi, Renae C. Pratt, Paul M. Oliver, Russell A. Palmer and Craig Moritz. 2018. Species Delimitation in the Gehyra nana (Squamata: Gekkonidae) Complex: Cryptic and Divergent Morphological Evolution in the Australian Monsoonal Tropics, with the Description of Four New Species. Zootaxa. 4403(2); 201–244. DOI:  10.11646/zootaxa.4403.2.1