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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Common NamesE: Romblon Province Gecko 
SynonymPseudogekko isapa SILER, DAVIS, DIESMOS, GUINTO, WHITSETT & BROWN 2016 
DistributionPhilippines (Sibuyan Island)

Type locality: Mt. Guiting-Guiting Natural Park, Municipality of Magdiwang, Barangay Talaba, Romblon Province, Sibuyan Island, Philippines (12.401873°N, 122.539747°E; WGS 84; 479 m elevation).  
Reproductionoviparous (manual imputation, fide Zimin et al. 2022) 
TypesHolotype: PNM 9816 (ACD Field No. 8920), adult male, collected at 21:30 hrs in 2014, by ACD and party. Paratype. One adult female (CAS 139713) collected on 22 May 1972, on a small vine in secondary forest, from Dubduban Barrio, Municipality of San Agustin, Romblon Province, Tablas Island, Philippines (12.58332°N, 122.1°E; WGS 84; ~17 m elev.), by L. C. Alcala and party. 
DiagnosisDiagnosis: Pseudogekko isapa sp. nov. can be distinguished from congeners by the following combination of characters: (1) body elongate (SVL 62.1, 63.4 mm), (2) axilla–groin distance long (32.1, 33.0 mm), (3) relative head length long (19% SVL), (4) relative snout length long (62, 64% head length), (5) Finger-III scansors 13, (6) Toe-IV scansors 17, (7) paravertebrals 240, 246, (8) ventral scales 135, 141, (9) supralabials 20, 21, (10) infralabials 17, 19, (11) circumorbitals 50, 54, (12) precloacal pores 15 in males, none in females, (13) femoral pores absent, (14) conspicuous head spotting present, (15) conspicuous dorsolateral spotting absent, (16) body striping absent, and (17) interorbital banding present (Tables 1, 2; Fig. 2).

Comparisons. Characters distinguishing Pseudogekko isapa sp. nov. from all other species of the Pseudogekko compresicorpus Complex sensu Siler et al. (2014b) are summarized in Tables 1, 2. Pseudogekko isapa sp. nov. most closely resembles P. compresicorpus; however, it differs from this species by having a longer snout–vent length (SVL 62.1–63.4 mm versus 54.9–59.7 mm), wider body width (midbody width 8.5–8.9 mm versus 5.4–6.7 mm), greater relative head length (head length 19% SVL versus 16–18%), fewer Finger-III (13 versus 15–17) and Toe-IV (17 versus 18 or 19) scansors, more (17–19 versus 13–16), more circumorbitals (50–54 versus 39–45), more paravertebrals (240–246 versus 226–234), more ventrals (135–141 versus 127–130), and more enlarged precloacal pore-bearing scales (15 versus 10–14; Fig. 2).
From the remaining members of the P. compresicorpus Complex, P. isapa sp. nov. can be distinguished from P. pungkaypinit by having a smaller body size (SVL 62.1–63.4 mm versus 66.6–76.8 mm), smaller axilla–groin distance (32.1–33.0 mm versus 37.2–41.2), longer relative snout length (62–64% head length versus 54–60%), fewer Finger-III scansors (13 versus 15–17), fewer paravertebrals (240–246 versus 265–280), fewer enlarged pore-bearing precloacals (15 versus 17–20), and the absence (versus presence) of body striping; and from P. chavacano and P. ditoy by having a larger body size (SVL 62.1–63.4 mm versus 54.7–55.9 [P. chavacano] or 49.4– 52.6 [P. ditoy]), larger axilla–groin distance (32.1–33.0 mm versus 26.7–30.0 [P. chavacano] or 25.1–29.7 [P. ditoy]), longer relative snout length (62–64% head length versus 55–58% [P. chavacano] or 57–59% [P. ditoy]), fewer Finger-III scansors (13 versus 15 or 16 [P. chavacano] or 14 or 15 [P. ditoy]) and enlarged pore-bearing precloacals (15 versus 16 [P. chavacano] or 18 [P. ditoy]), and more circumorbitals (50–54 versus 46 [P. chavacano] or 40–43 [P. ditoy]), paravertebrals (240–246 versus 195–197 [P. chavacano] or 180–185 [P. ditoy]), and ventrals (135–141 versus 122 or 123 [P. chavacano] or 111–118 [P. ditoy]; Tables 1, 2).
Pseudogekko isapa sp. nov. can be distinguished from members of the P. brevipes Complex (P. brevipes, P. atiorum), by having a larger body size (SVL 62.1–63.4 mm versus 41.1–52.5 [P. atiorum] or 34.5–42.4 [P. brevipes]), more supralabials (20 or 21 versus 15–17 [P. atiorum] or 13 or 14 [P. brevipes]), infralabials (17–19 versus 12–15 [P. atiorum] or 14 or 15 [P. brevipes]), circumorbitals (50–54 versus 35–38 [P. atiorum] or 33–35 [P. brevipes]), and ventrals (135–141 versus 119–129 [P. atiorum] or 96–117 [P. brevipes]).
From P. smaragdinus, P. isapa sp. nov. can be distinguished by having fewer Finger-III scansors (13 versus 15– 18) and lacking pore-bearing femorals (15 versus 32–41), more supralabials (20 or 21 versus 16–19), circumorbitals (50–54 versus 33–35), and ventrals scales (135–141 versus 124–130), a tendency towards having fewer Toe-IV scansors (17 versus 16–22), a tendancy towards having more infralabials (17 or 19 versus 14–17), and by the presence of brownish tan (versus yellow to orange [undisturbed] or neon green [disturbed]) body coloration, and absence (versus presence) of enlarged femoral pore-bearing scales in males. 
EtymologyWe derive the new species epithet from the Tagalog (Filipino) phrase isa pa, meaning “another” or “one more” in reference to our surprise at the discovery of yet another distinctive new species of Pseudogekko immediately following our review of the genus (Siler et al. 2014a), including what we thought was a comprehensive review of the P. compresicorpus (Siler et al. 2014b) and P. brevipes complexes (Davis et al. 2015a). 
  • BROWN, RAFE M.; CAMILA G. MENESES, PERRY L. WOOD, JR., JASON B. FERNANDEZ, MICHAEL A. CUESTA, MICHAEL A. CLORES, CLAIRE TRACY, MATT BUEHLER, AND CAMERON D. SILER 2020. Unexpected Discovery of Another New Species of Philippine False Gecko (Gekkonidae; Pseudogekko) from the Bicol Peninsula of Luzon Island. Herpetologica 76 (3): - get paper here
  • Meneses CG, Siler CD, Alviola PA, Gonzalez JCT, Balatibat JB, Natividad CA, Brown RM 2022. Amphibian and reptile diversity along a ridge-to-reef elevational gradient on a small isolated oceanic island of the central Philippines. Check List 18(5): 941-948 - get paper here
  • Meneses, C. G., Siler, C. D., Gonzalez, J. C. T., Wood Jr, P. L., & Brown, R. M. 2020. Molecular phylogenetic estimates of evolutionary affinities and the first reports of phenotypic variation in two secretive, endemic reptiles from the Romblon Island Group, central Philippines. Philippine Journal of Systematic Biology 14 (2): 1-20 - get paper here
  • Siler, Cameron D.; DREW R. DAVIS, ARVIN C. DIESMOS, FAITH GUINTO, COLLIN WHITSETT, RAFE M. BROWN 2016. A new species of Pseudogekko (Squamata: Gekkonidae) from the Romblon Island Group, Central Philippines. Zootaxa 4139 (2): 248–260 - get paper here
  • Zimin, A., Zimin, S. V., Shine, R., Avila, L., Bauer, A., Böhm, M., Brown, R., Barki, G., de Oliveira Caetano, G. H., Castro Herrera, F., Chapple, D. G., Chirio, L., Colli, G. R., Doan, T. M., Glaw, F., Grismer, L. L., Itescu, Y., Kraus, F., LeBreton 2022. A global analysis of viviparity in squamates highlights its prevalence in cold climates. Global Ecology and Biogeography, 00, 1–16 - get paper here
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