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| Luperosaurus alvarezi Meneses & Brown, 2026 Luperosaurus cumingii Gray, 1845 |
Abstract
We describe a new species of Luperosaurus based on two specimens collected on Sibuyan Island, Romblon Province, central Philippines. The new species is phenotypically similar to L. cumingii (southern Luzon), L. angliit (northern Luzon), L. corfieldi (from Panay and Negros islands), and L. macgregori (the Babuyan and Batanes island groups), but differs from these closely related congeners and all other known Luperosaurus by a combination of discrete morphological characters. Extensive molecular divergence from all closely related species for which genetic data are available supports the new species as a distinct lineage. Its distribution is geographically isolated from congeners, restricted to a permanently isolated deep-water island. The new species’ extremely limited geographic range contributes to the recognition of the remaining forests of the central Philippine Romblon Island Group as a fundamental conservation priority for the archipelago.
Squamata Oppel, 1811
Gekkonidae Gray, 1825
Luperosaurus Gray, 1845
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| Photos in life of Luperosaurus alvarezi sp. nov. (holotype and paratype) and Luperosaurus cumingii. Adult specimens of Luperosaurus alvarezi sp. nov. (left to right: holotype: PNM 9866: adult male; SVL 66.1 mm and paratype: UPLB-MNH-Z-NS 4622 (CGM 989); adult female; SVL 78.3 mm) from Mt. Guiting-Guiting Natural Park, Romblon Province, Sibuyan Island. Adult female L . cumingii (TNHC 61910; SVL 75.2 mm) from Mt. Malinao, Albay Province, Bicol Peninsula, Luzon Island. Note differences: L. cumingii has prominent spinose ventrolateral tail tubercles and heterogeneous nuchal and body tubercles (bottom left image). Photographs were taken by Camila G. Meneses and Rafe M. Brown. |
Luperosaurus alvarezi sp. nov.
Diagnosis. Luperosaurus alvarezi sp. nov. is diagnosed from congeners by possession of the following combination of characters: (1) bright yellow superciliaries and circumorbitals (Fig. 4); (2) light gray iris (Fig. 4); (3) precloacofemorals 22,22 (Fig. 5B; Fig. S1); (4) five scales contacting nostrils (Figs. 6A, 6B, 6D); (5) Head length/width 1.4,1.5; (6) presence of few, enlarged, flat to convex ornamental scales on margin of anterior forelimb expansion; (7) presence of elliptical, small, and oblique auricular opening; (8) dorsal body tubercles absent; (9) ventrolateral body tubercles absent; (10) presence of few, flat, and enlarged scales on caudal edges of tail whorls; (11) longitudinal midventrals 108, 110; (12) anterior hindlimbs expansions reduced to moderate folds. The condition of five scales contacting the nostrils, head length-to-width ratio, absence of dorsal and ventrolateral body tubercles, and presence of a few flat, enlarged scales on the caudal edges of tail whorls are shared among congeners but are diagnostic for Luperosaurus alvarezi sp. nov. in combination with other characters, distinguishing it from the morphologically similar L. corfieldi and L. cumingii, with which it shares certain intermediate external similarities. Table 1 presents a summary of the distribution of diagnostic character states among Philippine Luperosaurus.
Etymology: We are pleased to name the new species after our dear friend, frequent field companion and collaborator, the late James Alvarez (1991–2018), who lost his life while conducting bat research in the Philippines’ highest mountain, Mt. Apo, on December 8, 2018. We derived the specific epithet, a patronym, in the genitive singular, in recognition to Mr. Alvarez’s scientific contributions and demonstrated personal commitment to furthering knowledge of the natural history of Philippine chiropterans—in particular, the ecology and diversity of bats in Sibuyan Island.
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| Microhabitat of Luperosaurus alvarezi sp. nov. on Sibuyan Island, Philippines. (A) Habitat characteristics of the type locality of Luperosaurus alvarezi sp. nov. at Mt. Guiting-Guiting Natural Park, Sibuyan Island, Philippines, and (B) Appearance of the microhabitat of the new species of Fringed Forest Gecko, Luperosaurus alvarezi sp. nov., on the Gaong River. Photographs were taken by Camila G. Meneses. |
Camila G. Meneses and Rafe M. Brown. 2026. A New Species of fringed Forest Gecko, Genus Luperosaurus (Squamata: Gekkonidae), from Sibuyan Island, Central Philippines. PeerJ. 14:e20504. DOI: doi.org/10.7717/peerj.20504 [March 4, 2026]
