Published September 3, 2020. Updated September 2, 2026. Open access. Peer-reviewed.

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Speckled Lightbulb-Lizard (Riama meleagris)

Reptiles of Ecuador | Sauria | Gymnophthalmidae | Riama meleagris

English common names: Speckled Lightbulb-Lizard, Brown Lightbulb-Lizard.

Spanish common names: Lagartija minadora manchada.

Recognition: ♂♂ 18.9 cmMaximum distance from the snout to the tip of the tail. Snout–vent length=8.5 cm. ♀♀ 15.2 cmMaximum distance from the snout to the tip of the tail. Snout–vent length=7.5 cm..^1,2 Lightbulb-lizards (Riama) are easily distinguished from other sympatric lizards by their fossorial habits and extremely reduced extremities, where the fore- and hind limbs are too short to meet when adpressed against the body.³ Riama meleagris differs from its congeners by possessing entirely smooth (rather than keeled or striated) dorsal scales combined with a diagnostic color pattern consisting of a blackish dorsum covered in numerous small, white speckles.¹ It is one of only two species of Riama known to inhabit the slopes of Tungurahua Volcano; it is readily distinguished from the co-occurring R. balneator by its incomplete series of superciliary scales, whereas R. balneator possesses a complete series.¹ Adult males of R. meleagris are markedly more robust than females, have broader heads, and a higher concentration of bright yellowish spots (Fig. 1).¹

Variation among individuals of Riama meleagris

Figure 1: Individuals of Riama meleagris from the northern slope of Tungurahua Volcano () and Mucubí (), Tungurahua province, Ecuador.

Natural history: Riama meleagris is a rarely observed, secretive fossorial lizard that nevertheless can attain high localized population densities within specialized microhabitats. It inhabits pristine to heavily modified high-evergreen montane forests and humid highland shrublands, frequently persisting in agricultural mosaic environments that blend active crop fields (such as maize, potato, and naranjilla), pastures, and fragmented patches of native vegetation.² Speckled Lightbulb-Lizards spend the majority of their lives within subterranean galleries in friable soils or concealed beneath boulders, decaying logs, and leaf debris.² When disturbed or unearthed, individuals rapidly seek refuge in soil crevices or beneath rocks; if captured or handled, they readily employ caudal autotomy to shed the tail.

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Conservation: Endangered Considered to be facing a high risk of extinction in the near future..⁴ Riama meleagris is here proposed for reassessment and elevation to this threat category—rather than its previous designation of Near Threatened⁵—because the species is known from fewer than 10 fragmented populations spanning an estimated extent of occurrence of approximately 587 km² that has lost nearly 86.8% of its original natural vegetation cover.⁶ Habitat loss and degradation within its range continue unabated due to expanding agricultural frontiers, livestock grazing, and rapid rural-urban development. Furthermore, catastrophic natural events, specifically major volcanic eruptions and pyroclastic events from the active Tungurahua Volcano, pose an acute, ongoing extinction threat to the localized populations persisting along its slopes.⁵

Distribution: Riama meleagris is endemic to an area of approximately 587 km² in the Amazonian slopes of the Andes along the upper Pastaza river watershed in central Ecuador (Fig. 2).

Figure 2: Distribution of Riama meleagris in Ecuador. See Appendix 1 for a complete list of the presence localities included in the map.

Etymology: The generic name Riama does not appear to be a reference to any feature of this group of lizards, but a matter of personal taste. John Edward Gray usually selected girls’ names to use on reptiles.^7–10 The specific epithet meleagris is a Greek word meaning “guinea fowl.” It probably refers to the speckled color pattern characteristic to males of this species.¹

Where to observe: Riama meleagris is rarely encountered during routine visual searches unless field researchers actively target its subterranean microhabitats by methodically overturning large rocks, decaying logs, and agricultural debris, or by excavating loose, friable soils along the borders between active pastures and remnants of montane forest. Prime locations for observing this elusive species include the rural surroundings of Mucubí and El Triunfo in Tungurahua province, where targeted microhabitat searches can yield encounter rates of approximately 4–12 individuals per full day of field effort.

Acknowledgments: This account was published with the support of Secretaría Nacional de Educación Superior Ciencia y Tecnología (programa INEDITA; project: Respuestas a la crisis de biodiversidad: la descripción de especies como herramienta de conservación; No 00110378), Programa de las Naciones Unidas (PNUD), and Universidad San Francisco de Quito (USFQ).

Author: Alejandro Arteaga^aAffiliation: Fundación Khamai, Reserva Arlequín, Ecoruta Paseo del Quinde km 56, Santa Rosa de Mindo, Pichincha 171202, Ecuador.

Academic reviewer: Jeffrey D Camper^bAffiliation: Department of Biology, Francis Marion University, Florence, USA.

Photographer: Jose Vieira^cAffiliation: Tropical Herping (TH), Quito, Ecuador.^,^dAffiliation: ExSitu, Quito, Ecuador.

How to cite? Arteaga A (2026) Speckled Lightbulb-Lizard (Riama meleagris). In: Arteaga A, Bustamante L, Vieira J (Eds) Reptiles of Ecuador: Life in the middle of the world. Available from: www.reptilesofecuador.com. https://doi.org/10.47051/VXYO9446

Literature cited:

Kizirian DA (1996) A review of Ecuadorian Proctoporus (Squamata: Gymnophthalmidae) with descriptions of nine new species. Herpetological Monographs 10: 85–155. https://doi.org/10.2307/1466981
Field notes, Reptiles of Ecuador book project.
Doan TM, Castoe TA (2005) Phylogenetic taxonomy of the Cercosaurini (Squamata: Gymnophthalmidae), with new genera for species of Neusticurus and Proctoporus. Zoological Journal of the Linnean Society 143: 405–416. https://doi.org/10.1111/j.1096-3642.2005.00145.x
Carrillo E, Aldás A, Altamirano M, Ayala F, Cisneros-Heredia DF, Endara A, Márquez C, Morales M, Nogales F, Salvador P, Torres ML, Valencia J, Villamarín F, Yánez-Muñoz M, Zárate P (2005) Lista roja de los reptiles del Ecuador. Fundación Novum Millenium, Quito, 46 pp.
Cisneros-Heredia DF, Yánez-Muñoz MH, Reyes-Puig C (2017) Riama meleagris. The IUCN Red List of threatened species. Available from: www.iucnredlist.org. https://doi.org/10.2305/IUCN.UK.2017-2.RLTS.T44578798A44578807.en
MAE (2012) Línea base de deforestación del Ecuador continental. Ministerio del Ambiente del Ecuador, Quito, 30 pp.
Gray JE (1831) Description of a new genus of ophisaurean animal, discovered by the late James Hunter in New Holland. Treuttel, Würtz & Co., London, 40 pp.
Gray JE (1831) A synopsis of the species of the class Reptilia. In: Griffith E, Pidgeon E (Eds) The animal kingdom arranged in conformity with its organization. Whittaker, Treacher, & Co., London, 1–110.
Gray JE (1838) Catalogue of the slender-tongued saurians, with descriptions of many new genera and species. Annals and Magazine of Natural History 1: 274–283.
Gray JE (1845) Catalogue of the specimens of lizards in the collection of the British Museum. Trustees of the British Museum, London, 289 pp.

Appendix 1: Locality data used to create the distribution map of Riama meleagris in Ecuador (Fig. 2).

Country	Province	Locality	Source
Ecuador	Tungurahua	Cascada Palitahua	Reptiles of Ecuador book database
Ecuador	Tungurahua	Chorrera El Batán	Arteaga et al. 2026
Ecuador	Tungurahua	Cotaló	Aguirre et al. 2014
Ecuador	Tungurahua	Cotaló	Aguirre et al. 2014
Ecuador	Tungurahua	El Calvario	Aguirre et al. 2014
Ecuador	Tungurahua	Mucubí, environs of	Arteaga et al. 2026
Ecuador	Tungurahua	Reserva Naturetrek	Fundacion EcoMinga
Ecuador	Tungurahua	San Antonio mountains	Arteaga et al. 2026
Ecuador	Tungurahua	Tungurahua Volcano	Arteaga et al. 2026
Ecuador	Tungurahua	Way to El Copete	Arteaga et al. 2026