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Hemidactylus hannahsabinae CERÍACO, AGARWAL, MARQUES & BAUER, 2020

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common Names 
SynonymHemidactylus hannahsabinae CERÍACO, AGARWAL, MARQUES & BAUER 2020: 95
Hemidactylus hannasabinae CERÍACO et al. 2020: 92 (in error)
Hemidactylus nzingae CERÍACO et al. 2020: 48 [part] 
DistributionAngola (Bié, Malanje Provinces)

Type locality: Pavalange, Luando Natural Reserve (-10.969765°, 17.612431°, 1127 m elevation), Bié Province  
Reproduction 
TypesHolotype. ANSP 32189 (Fig. 1; Table 2), adult male, collected by Harold T. Green in October 1930. Additional specimens: AMNH 
DiagnosisDiagnosis. A medium sized Hemidactylus, maximum snout-vent length 47.4 mm, and a short, blunt snout (Fig. 1). Dorsal pholidosis heterogeneous, with 18 irregularly arranged longitudinal rows of subquadrangular, striated, feebly keeled tubercles at midbody. Two well developed pairs of postmentals, the inner pair longer than the outer pair, but about half the size of the mental, and in contact behind the mental. Ventrolateral folds distinct, about 26 scale rows across venter. Five divided scansors beneath first digit of both manus and pes, seven to eight beneath fourth digit of manus, nine beneath the fourth digit of pes. Males with a continuous series of 6–8 precloacal pores. Body dorsum brown with scattered dark markings (not forming transverse series), bordered by a thin faint cream- colored stripe extending from behind the eyes to the insertion of the legs.

Comparison with West and Central African congeners. Hemidactylus hannahsabinae sp. nov. is readily distinguished from H. kamdemtohami Bauer & Pauwels, 2002, and H. richardsonii (Gray, 1845) by the lack of basal digital webbing and from H. matschiei (Tornier, 1902) by having spiny tubercles on the dorsum and small subcaudal scales. It may be distinguished from H. steindachneri by lacking a longitudinal row of keeled tubercles on the ventrolateral border of flanks, from H. hecqui by not having the nostril in contact with the first supralabial. Hemidactylus hannahsabinae sp. nov. can be distinguished from H. muriceus sensu stricto by a higher number of tubercle rows on the dorsum (16–18 versus 7–12), fewer granular scales between the dorsal tubercles (1–3 versus 5–10); and fewer nasals surrounding the nostril (2 versus 3). The new species can be distinguished from H. pseudomuriceus by having fewer precloacal-femoral pores in males (6–9 versus 14–17), a higher number of tubercle rows on the dorsum (16–18 versus 6–14), fewer granular scales between the dorsal tubercles (1–3 versus 5–10); and fewer nasals surrounding the nostril (2 versus 3). The newly described species can be distinguished from H. echinus by having a higher number of tubercle rows on the dorsum (16–18 versus 13–15), and by being smaller (max SVL 47.4 mm versus 68.0 mm). Hemidactylus hannahsabinae sp. nov. differs from H. ansorgii by a higher number of tubercle rows on the dorsum (16–18 versus 6–12), a lower number of precloacal-femoral pores (6–9 versus 10–11), fewer nasals surrounding the nostril (2 versus 3), a stockier body (H. ansorgii has a slender body and narrow head with a short interorbital distance). Hemidactylus ansorgii also has a row of pointed tubercles separating the venter and the flanks, which are completely devoid of any tubercles, (see figure in Tornier 1902 and Perret 1975), whereas in H. hannahsabinae sp. nov. this ventrolateral row of tubercles is lacking, and tubercles extend across the flanks and dorsum.
Comparing the new species with the other Angolan congeners, Hemidactylus hannahsabinae sp. nov. is easily distinguishable from H. mabouia by its smaller size (maximum SVL 47.4 mm versus 67.4 mm), lower number of precloacal-femoral pores in males (6–9 versus 28–39), fewer granular scales between the dorsal tubercles (1–3 versus 5–10), and lower number of rows of ventral scales (26 versus 34–37). The new species may be distinguished from H. benguellensis by a much lower number of precloacal-femoral pores in males (6–9 versus 23–33), and fewer granular scales between the dorsal tubercles (1–3 versus 4–9). The new species can be distinguished from H. bayonii by its larger size (maximum SVL 47.4 mm versus 36.2 mm), by having higher number of tubercle rows on the dorsum (16–18 versus 14–16), fewer granular scales between the dorsal tubercles (1–3 versus 4–7), and fewer rows of ventral scales (26 versus 28–33). Hemidactylus hannahsabinae sp. nov. can be distinguished from H. longicephalus by having fewer granular scales between the dorsal tubercles (1–3 versus 3–6), and fewer rows of ventral scales (26 versus 30–33). It can be distinguished from H. paivae by its smaller size (max SVL 47.4 mm versus 68.4 mm), having a higher number of tubercle rows on the dorsum (16–18 versus 14–16), a lower number of granular scales between the dorsal tubercles (1–3 versus 4–9), and a lower number of rows of ventral scales (26 versus 28–34).
Hemidactylus hannahsabinae sp. nov. can be distinguished from H. nzingae, with which it was previously confused by Ceríaco et al. (2020), by subquadrangulal, smoothly keeled, striated tubercles at midbody (versus subtrihedral, strongly keeled tubercles at midbody in H. nzingae), by having the enlarged tubercles of the same size and with similar keel across the dorsum (versus enlarged tubercles more strongly keeled and slightly larger on flanks and close to the tail than on the dorsum in H. nzingae) (Fig. 2); by having barely distinct dorsolateral bands, one longitudinal middorsal light stripe evident, eight to nine rows of incomplete transverse dark bands, on a homogeneous light brown background (versus the two well-marked longitudinal cream dorsolateral stripes and the prominent dark W-shaped markings and brown dorsal coloration in H. nzingae (Fig. 3)). 
Comment 
EtymologyThe specific epithet hannahsabinae honors Hannah Sabin of the Sabin family, philanthropic supporters of herpetofaunal conservation. 
References
  • CERÍACO, LUIS M. P.; ISHAN AGARWAL, MARIANA P. MARQUES, AARON M. BAUER 2020. A correction to a recent review of the genus Hemidactylus Goldfuss, 1820 (Squamata: Gekkonidae) from Angola, with the description of two additional species. Zootaxa 4861 (1): 92-106 - get paper here
  • CERÍACO, LUIS M. P.; ISHAN AGARWAL, MARIANA P. MARQUES, AARON M. BAUER 2020. A review of the genus Hemidactylus Goldfuss, 1820 (Squamata: Gekkonidae) from Angola, with the description of two new species. Zootaxa 4746 (1): 1-71. - get paper here
 
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