Cyrtodactylus maryantoi, Riyanto & Jusivani & Hamidy & Nikmah, 2025

Cyrtodactylus maryantoi sp. nov.

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Recommended English common name: Maryanto’s Bent-toed Gecko

Recommended Indonesia common name: Cicak Jari Lengkung Maryanto

Figs 4–5 View FIGURE 4 View FIGURE 5

Holotype. Adult male, MZBLace 14255 ( Figure 4 View FIGURE 4 ), collected from Alla Alla riverbank, Kuala Makmur village , East Simeulue Sub District , Aceh province ( 2°33’22”N, 96°18’59”E, 4 m a.s.l.), by Mulyadi on 24 July 2017 at 08.30 pm. GoogleMaps

Paratypes. Adult female MZBLace 14253 and adult male MZBLace 14254. Data same as holotype ( Figure 4 View FIGURE 4 ).

Diagnosis. The following combination of characters distinguishes C. maryantoi sp. nov. from all other congeners: adult males reaching 57.8 mm SVL and females 59.9 mm SVL; tubercles present on both dorsal of brachium; ventrolateral fold present; 20–22 irregular dorsal tubercle rows at midbody; 34–35 paravertebral tubercles series; 38–42 ventral scale rows across belly; precloacal groove absent; 2 precloacal pores present in males, absent in females; enlarged precloacofemoral scales present; abrupt transition between the enlarged femorals and the adjacent scales on the posterior margin of the thigh; 18–21 subdigital lamellae on fourth toe; and subequal median subcaudal scales not transversely enlarged.

Description of holotype. Small-sized Cyrtodactylus with SVL of 55.7 mm; the length of the tail is 60.8 mm including the original or regenerated tip; the axial body length is 55.7 mm. The head is triangular in dorsal view with moderate length (HL/SVL=0.28), wide (HW/HL=0.63), and slightly flattened (HH/HL= 0.40), distinguishable from neck; medium length of snout (SL/HL=0.44) and rounded; snout longer than eye diameter (SL/OD 1.62); eyes large (OD/HL=0.27); ear openings oval and small (EarL/HL=0.07); eye to ear distance greater than diameter of eye (EaEy/OD=1.14); postorbital and around ear region consists of enlarged tubercles; scales on post nasal to preorbital and post-rostral to frontal region slightly larger in size than scales on the parietal part and occiput; region of parietal containing small scales intermixed with weak, scattered, rounded tubercles as well as occiput region.

Rostral rectangular, incompletely divided dorsally by a Y-shaped shallow groove, wider than hight (RW/ RH=1.29), bordered posterolaterally by first supralabials and naris, and dorsally by five postrostral scales; naris oval, bordered anteriorly by rostral by 1 postrostral, posteriorly by three scales in right side and by three scales in left side, and ventrally by first supralabials; orbit separated from supralabials by two rows of small lorilabial scales; 11 supralabial scales to angle of jaw in right side, 12 in left side; 8 infralabial scales right side, 8 in left side. Mental triangular, slightly wider than long (ML/MW=0.82); bordered laterally by first infralabials, posteriorly by a pair of enlarged first postmentals, which contact medially over about 38.3% of their length; second postmentals ovoid hexagonal, about one-third of the first postmentals and separated from each another by 4 granular scales; gular sales small, granular, grading to slightly smaller size posteriorly.

Body elongates (AGL/SVL= 0.49); dorsal scales small and granular, interspersed with relatively high, keeled to rounded tubercles irregularly arranged in 20 longitudinal rows at midbody; ventrolateral body folds with blunt conical tubercles; 35 paravertebral tubercles in each row. Ventral scales larger than dorsal scales, smooth, flat, imbricate, 38 ventral scale rows between ventrolateral body folds across the belly; enlarged scales immediately anterior to the cloacal opening absent.

Forelimbs relatively short (ForL/SVL=0.14); dorsal scales on forelimbs and upper arms tri-keeled, forelimbs tuberculate, upper arm without tubercles; palmar scales flat, smooth, subimbricate; digits well developed, inflected at basal interphalangeal joints, digits slightly narrower distal to inflection; subdigital lamellae transversely expanded along the entire length of each digit, but slightly compressed in both length and width immediately distal to interphalangeal inflection; subdigital lamellae on digits of manus: I(13), II(16), III(16), IV(13), V(9); claws well developed, sheathed by 2 dorsal scales and 1 ventral scale.

Hindlimbs longer than forelimbs (TibL/SVL=0.18); covered dorsally by granular scales interspersed with larger, keeled tubercles; anterioroventral scales of thigh rounded, smooth, flat, subimbricate to juxtaposed; enlarged femoral and precloacal scales arranged in a continuous series, 33, the largest in femoral part; precloacal groove absent; 2 precloacal pores in ( Figure 5 View FIGURE 5 ); ventral scales on tibia smooth, flat, subimbricate; plantar scales slightly raised; digits well developed, inflected at basal metapodial-phalangeal joints, digits slightly narrower distal to inflection; subdigital lamellae transversely expanded along the entire length of each digit, but slightly compressed in both length and width immediately distal to interphalangeal inflection; subdigital lamellae on digits of pes: I(10), II(13), III(16), IV(18), V(16); claws well developed, sheathed by 2 dorsal scales and 1 ventral scale.

Tail regenerated, 60.8 mm in length; on the original part segmented, dorsally with keeled tubercles arranged in transverse rows forming whorls and original part of subcaudal without enlarged transverse plates; three postcloacal tubercles (spurs) on each side in both sexes.

Variation. Males have precloacal pores whereas females do not. Detailed variation of mensural and meristic characters of the type series is presented in Table 4.

Etymology. The specific epithet maryantoi is a noun in the genitive singular, honoring Indonesian mammalogist Professor Ibnu Maryanto for his outstanding contributions to science, biodiversity policy, and conservation in Indonesia. It also recognizes his exceptional dedication to mentoring and inspiring future generations of taxonomists and conservationists.

Comparison. Among C. sworderi group, Cyrtodactylus maryantoi sp. nov. differs from its sister species, C. awalriyantoi , in the having larger maximum SVL (59.9 versus 53.8 mm), larger maximum AGL (29 versus 24 mm), greater number of DorT (20–22 versus 16–19), greater number of lamellae under fourth toes (18–21 versus 14–19), and blotched dorsal pattern ( versus striped). It differs from C. guakanthanensis Grismer, Belabut, Quah, Onn, Wood & Hasim, 2014a by smaller maximum SVL (59.9 versus 82.2 mm), having precloacal pores (2 versus lacking), and blotches body pattern ( versus banded). From C. gunungsenyum Grismer, Wood, Anuar, Davis, Cobos & Murdoch, 2016 a congener from Peninsular Malaysia, it differs in having smaller maximum SVL (59.9 versus 74.7 mm), having precloacal pores (2 versus lacking), and blotches body pattern ( versus banded). It differs from C. quadrivirgatus from Peninsular Malaysia by having shorter maximum SVL (57.7 versus 67 mm), shorter maximum AGL (29.0 versus 34 mm) and fewer DorT (20–22 versus 24). From C. sworderi , it differs in smaller maximum SVL (59.9 versus 80.1 mm), fewer precloacal pores (2 versus 5–9), and and blotches body pattern ( versus spotted). It differs from C. tebuensis in having smaller maximum SVL (59.9 versus 79.1 mm), having preclocal pores (2 versus lacking), and blotches body pattern ( versus striped/spotted). The morphological comparison among species in Cyrtodactylus sworderi group presented in Table 5.

Among other congeners occurring in Sumatra, Cyrtodactylus maryantoi sp. nov. differs from C. agamensis in having smaller maximum SVL (59.9 versus 86.8 mm), fewer number of VS (38–42 vs. 50–67), preclocal pores ( versus precloacofemoral pores), and lacking precloacal depression ( versus present). It differs from C. consobrinus in having smaller maximum SVL (59.9 versus 121.4 mm), fewer precloacal pores (2 versus 6–8), lacking femoral pores ( versus 0–4), fewer lamellae under fourth toes (21 versus 23–36), lacking enlarged medial subcaudal ( versus present), and blotched body pattern ( versus banded). It differs from C. lateralis in having smaller maximum SVL (59.9 versus 100 mm), fewer VS (35–42 versus 51–66), fewer precloacal pores (2 versus 9–13), and lacking precloacal depression ( versus grooved). It differs from C. psarops in having having smaller maximum SVL (59.9 versus 82 mm), fewer DorT (21–22 versus 23–26), lacking precloacal depression ( versus grooved), and preclocal pores ( versus precloacofemoral pores). It differs from C. semicinctus in having having smaller maximum SVL (59.9 versus 89 mm), fewer DorT (21–22 versus 24–27), lacking precloacal depression ( versus groovy), and preclocal pores ( versus precloacofemoral pores).

Distribution and natural history. Cyrtodactylus maryantoi sp. nov. was collected in the lowland area on a riverbank in Simeulue Island, Aceh Province, Indonesia ( Figure 6 View FIGURE 6 ). The type series was collected when active at night, the type specimen was caught on a rock, MZBLace 14253 on a tree buttress and MZBLace 14254–55 on tree trunks approximately 1 meter above the ground. Given these observations, we consider this species a habitat generalist ( sensu Grismer et al. 2021).