Sauresia gracilis SCHOOLS & HEDGES, 2024
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Sauresia gracilis
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| Higher Taxa | Diploglossidae, Diploglossa, Anguimorpha, Sauria, Squamata (lizards) |
| Subspecies | |
| Common Names | E: Slender Four-toed Forest Lizard |
| Synonym | Sauresia gracilis SCHOOLS & HEDGES 2024: 231 Sauresia sepsoides — SCHWARTZ & HENDERSON 1988:162 (part) Sauresia sepsoides — SCHWARTZ & HENDERSON 1991:463 (part) Celestus sepsoides — HENDERSON & POWELL 2009:105 (part) Celestus sepsoides — HEDGES et al., 2019:17 (part) Sauresia sepsoides — SCHOOLS & HEDGES 2021:231 (part) Sauresia sepsoides — LANDESTOY et al., 2022: 205 (part) |
| Distribution | Haiti Type locality: 10.3 km Nw of Port Salut, Sud Department, Haiti (18.1419, -73.9711; 10 m). |
| Reproduction | |
| Types | Holotype. USNM 328852, an adult, collected by S. Blair Hedges and Richard Thomas on 28 October 1984. |
| Diagnosis | Diagnosis. Sauresia gracilis sp. nov. has (1) a dorsal pattern of mottled/lineate, (2) head markings absent, (3) markings in the longitudinal paramedian area present, (4) dots arranged in bars in the lateral band absent, (5) a maximum SVL of 51.1 mm, (6) ventral scale rows, 103, (7) midbody scale rows, 36, (8) total lamellae on one hand, 18, (9) total strigae on ten scales, 100, (10) relative length of all digits on one hindlimb, 13.8 %, (11) relative distance between the angled subocular and mouth, 0.254 %, (12) relative eye length, 2.97 %, (13) relative forelimb length, 10.8 %, (14) relative ear width, 0.665 %, (15) relative rostral height, 1.90 %, (16) relative head length, 15.7 %, (17) relative mental width, 1.76 %, (18) relative postmental width, 2.76 %, (19) relative cloacal width, 7.18 %, (20) relative prefrontal width, 3.81 %, (21) relative largest supraocular width, 2.44 %, (22) relative longest finger length, 1.96 %, (23) relative distance between the ear and eye, 7.63 %, (24) relative head width, 67.6 %, (25) relative frontal width, 82.9 %, (26) relative nasal height, 0.998 %, (27) relative angled subocular height, 0.958 %, (28) relative distance between the eye and naris, 3.15 %, (29) relative canthal iii length, 1.82 %, (30) relative angled subocular width, 1.96 %, and (31) relative nasal length, 1.33 %. The species stem time is 4.21 Ma and no data are available to estimate the species crown time (Fig. 4). Sauresia gracilis sp. nov. has a larger relative postmental width (2.76), relative cloacal width (7.18), and relative canthal iii length (1.82) than all other species of the genus. The only known specimen of S. gracilis sp. nov. is a small adult specimen, which may contribute to a bias towards larger measurements. From Sauresia agramma sp. nov., we distinguish S. gracilis sp. nov. by the dorsal pattern (mottled/lineate versus absent), the adult SVL (51.1 versus 53.8–69.1), the ventral scale rows (103 versus 121–127), the midbody scale rows (36 versus 37–39), the total lamellae on one hand (18 versus 17), the total strigae on ten scales (100 versus 103–138), the relative rostral height (1.90 versus 1.92–2.12), the relative head length (15.7 versus 13.6– 15.2), the relative postmental width (2.76 versus 2.30–2.70), the relative cloacal width (7.18 versus 6.09–6.82), the relative longest finger length (1.96 versus 2.11–2.86), the relative head width (67.6 versus 69.7–74.6), the relative frontal width (82.9 versus 80.2–81.9), the relative width of canthal iii (1.82 versus 1.17–1.30), the relative angled subocular width (1.96 versus 2.07–2.47), and the relative nasal width (1.33 versus 1.36–1.57). From S. cayemitae sp. nov., we distinguish S. gracilis sp. nov. by the relative eye length (2.97 versus 2.14–2.90), the relative head length (15.7 versus 13.0–15.6), the relative postmental width (2.76 versus 2.27–2.51), the relative cloacal width (7.18 versus 5.59–6.24), the relative prefrontal width (3.81 versus 3.11–3.64), the relative largest supraocular width (2.44 versus 1.67–2.25), the relative longest finger length (1.96 versus 2.36–2.65), the relative distance between the ear and eye (7.63 versus 6.02–6.88), the relative head width (67.6 versus 68.5–77.1), the relative nasal height (0.998 versus 0.792–0.951), and the relative width of canthal iii (1.82 versus 1.07–1.30). From S. habichi, we distinguish S. gracilis sp. nov. by the head markings (absent versus present), the adult SVL (51.1 versus 51.9–63.3), the ventral scale rows (103 versus 122–125), the midbody scale rows (36 versus 38–41), the relative length of digits on one hindlimb (13.8 versus 11.2–13.1), the relative distance between angled subocular and mouth (0.254 versus 0.000594–0.201), the relative eye length (2.97 versus 2.22–2.95), the relative head length (15.7 versus 13.3–15.0), the relative postmental width (2.76 versus 2.11–2.34), the relative cloacal width (7.18 versus 5.86–6.68), the relative largest supraocular width (2.44 versus 1.96–2.23), the relative longest finger length (1.96 versus 2.26–2.71), the relative distance between the ear and eye (7.63 versus 6.64–7.30), the relative head width (67.6 versus 77.7–78.6), the relative frontal width (82.9 versus 71.8–77.5), and the relative width of canthal iii (1.82 versus 1.10–1.41). From S. manicula sp. nov., we distinguish S. gracilis sp. nov. by the dorsal pattern (mottled/lineate versus absent), the ventral scale rows (103 versus 121–129), the midbody scale rows (36 versus 37–38), and the total lamellae on one hand (18 versus 15–17). From S. pangnolae sp. nov., we distinguish S. gracilis sp. nov. by the dorsal pattern (mottled/lineate versus absent/irregular dots), the adult SVL (51.1 versus 53.8–66.7), the ventral scale rows (103 versus 104–119), the relative forelimb length (10.8 versus 11.4–12.6), the relative ear width (0.665 versus 0.681– 1.11), the relative head length (15.7 versus 13.0–15.4), the relative postmental width (2.76 versus 2.04–2.47), the relative cloacal width (7.18 versus 6.07–6.81), the relative longest finger length (1.96 versus 2.29–2.54), the relative distance between the ear and eye (7.63 versus 6.94–7.46), the relative head width (67.6 versus 70.8–78.2), the relative frontal width (82.9 versus 69.6–81.5), the relative width of canthal iii (1.82 versus 1.09–1.51), the relative angled subocular width (1.96 versus 2.16–2.39), and the relative nasal width (1.33 versus 1.38–1.62). From S. sepsoides, we distinguish S. gracilis sp. nov. by the ventral scale rows (103 versus 104–119), the relative postmental width (2.76 versus 1.92–2.61), the relative cloacal width (7.18 versus 5.11–6.77), and the relative width of canthal iii (1.82 versus 0.943–1.62). From S. synoria sp. nov., we distinguish S. gracilis sp. nov. by the dorsal pattern (mottled/lineate versus absent), the adult SVL (51.1 versus 53.5–72.0), the ventral scale rows (103 versus 114–127), the relative length of digits on one hindlimb (13.8 versus 10.5–12.3), the relative eye length (2.97 versus 2.47–2.94), the relative mental width (1.76 versus 1.21–1.70), the relative postmental width (2.76 versus 2.09–2.75), the relative cloacal width (7.18 versus 5.62–6.94), the relative prefrontal width (3.81 versus 3.01–3.30), the relative largest supraocular width (2.44 versus 1.57–1.91), the relative head width (67.6 versus 70.8–76.0), and the relative width of canthal iii (1.82 versus 0.943–1.31). |
| Comment | |
| Etymology | Named after Latin gracilis, a nominative singular adjective meaning “slender,” alluding to the thin body shape and unusually low number of midbody scale rows in the holotype and only known representative of this species. |
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