Aparasphenodon pomba, Assis, Clodoaldo Lopes De, Santana, Diego José, Silva, Fabiano Aguiar Da, Quintela, Fernando Marques & Feio, Renato Neves, 2013
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publication ID |
https://doi.org/ 10.11646/zootaxa.3716.4.6 |
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publication LSID |
lsid:zoobank.org:pub:95EAEF15-6A23-449E-94A0-8A9A7B72904B |
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DOI |
https://doi.org/10.5281/zenodo.5679746 |
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persistent identifier |
https://treatment.plazi.org/id/03B29917-7634-FF87-FF01-FC0AFC34F16D |
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treatment provided by |
Plazi |
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scientific name |
Aparasphenodon pomba |
| status |
sp. nov. |
Aparasphenodon pomba View in CoL sp. nov.
( Figs 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 )
Holotype. MZUFV 10438 ( Figs 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 ), adult male, collected at Sítio Boa Sorte (21º20’S, 42º45’W; 288 m a.s.l.), locality Sinimbú, municipality of Cataguases, Minas Gerais. Collected by Clodoaldo L. Assis and A.G. Corrêa, 2 October 2008.
Paratopotypes. All collected in the type locality by C.L. Assis, unless otherwise stated. MNRJ 82596 (adult female; 19 October 2010; col. F.A. Silva), MZUFV 11517–518 (adult females; 1 August 2011), MZUFV 11519 (adult male; 1 August 2011), MZUFV 11520 (adult male; 5 October 2011); MZUFV 13320 (adult male; 30 October 2011); MZUFV 12126 (adult female; 14 December 2011; diaphanized); MNRJ 82597 (adult male; 19 nuary 2012); MZUFV 12728 (adult male; 27 October 2012); MZUFV 12987 (adult female; 1 December 2012; diaphanized); MZUFV 12988 (adult male; 1 December 2012; diaphanized).
Diagnosis. The characters that have been used as possible synapomorphies for the genus Aparasphenodon do not withstand detailed analysis, as thoroughly discussed by Pimenta et al. (2009). Therefore, considering the morphological and morphometric aspects, in addition to the geographical distribution of the genus, we consider our allocation of the new species to Aparasphenodon as merely tentative.
The species is characterized by: (1) medium size (males SVL 51.6–60.5 mm, n = 4; females SVL 58.7–62.1 mm, n = 4; Table 1 View TABLE 1 ); (2) head longer than broad; (3) iris red; (4) snout almost rounded in dorsal view and acute in profile; (5) dorsum and limbs with cream-colored reticulation on dark-brown background; (6) lips white; (7) presence of a cream-colored dorsolateral stripe originating on snout, extending to upper eyelid and posteriorly to level of axilla; (8) dorsal surface of skull tightly co-ossified; (9) absence of hand webbing; (10) large toe disc, almost rounded; (11) single subgular vocal sac; (12) ventral surface of thighs and arms brown, sparsely granulated; (13) gular region and venter light gray, moderately granulated and with cream-colored spots; (14) sum of thigh and tibia lengths 89–91 % of snout-vent length.
Description of holotype. Medium in size (SVL 60.5 mm). Head slightly longer than wide (HW/HL 0.95). Snout almost rounded in dorsal view, acute in lateral view. Canthus rostralis slightly elevated, almost straight. Loreal region slightly concave. Eyes large (ED/TD 1.6), directed anteriorly. Tympanum round and 1.7 times smaller than eye diameter. Supra-tympanic fold barely distinct, partially covering the tympanum and extending from posterior eyelid margin to posterior margin of tympanic ring. Nostrils in dorsolateral position. Internarial region slightly grooved, laterally delimited by two small bony crests. Skin of dorsal surface of head tightly coossified. Posterior region of head straight. Coanae elliptical. Series of vomerine teeth arranged in two oblique clusters, posteromedial between the choanae, with posterior edges turned to choanae posterior margins and anterior edges turned to the midpoint between them. Fourteen to 16 vomerine teeth on each side. Tongue large, covering almost entire buccal floor. Forearm robust, arm slender. Subarticular tubercles of first, second, and third fingers round, subarticular tubercle of fourth finger bifid; supernumerary tubercles present; palmar tubercles developed, elongated. Fingers without webbing; disks large, almost rounded. Medium-sized legs, considering thigh and tibia lengths. Sum of thigh and tibia lengths 91.9% of SVL. Nuptial pads absent. Calcar absent; internal metatarsal tubercle large, elongated; external metatarsal tubercle small; subarticular tubercles round; supernumerary tubercles distinct; toe webbing formula I 2 +–2 II 1 1/3–2 2/3 III 1 1/2–2 2/3 IV 2 2/3–1 1/ 3 V. Pectoral fold absent. Skin smooth dorsally and granular ventrally; ventral surface of thighs and arms slightly granular.
Measurements of holotype. SVL 60.5, HL 19.6, HW 18.6, ED 5.6, UEW 4.3, END 7.0, IND 4.6, TD 3.5, IOD 7.4, NSD 2.9, THL 27.0, TL 28. 6, FL 39.3, 3FD 3.1, 4TD 2.8.
Color in life. Dorsum and limbs with cream-colored reticulation on a dark-brown background ( Fig. 4 View FIGURE 4 A); dorsolateral cream-colored stripe extends from snout, across upper eyelid and reaching the axilla. Ventral surface light brown with cream-colored spots. Iris red.
Color in preservative. Color in preservative similar to color in life. The cream-colored spots become duller, although with no change in the hue; the dark-brown background becomes duller and slightly lighter; and the venter darkens, following the same color pattern of the ventral surface for the thighs and arms.
Variation. All specimens from the type series agree in morphology and color. The dorsolateral stripe may extend farther posteriorly on the dorsum. The light and dark ventral spots vary in number and intensity. The males and females have the same color pattern. Sexual dimorphism is evident only in the size: the males are larger than the females ( Table 1 View TABLE 1 ).
Comparisons with other species. Aparasphenodon pomba sp. nov. is readily distinguished from A. brunoi by its slightly elevated canthus rostralis (prominent and elevated in A. brunoi ), loreal region slightly concave (loreal region deep and concave in A. brunoi ), absence of a prenasal bone (prenasal bone present in A. brunoi ), and iris bright red (iris brown, tending to dark red in A. brunoi ). Aparasphenodon pomba sp. nov. is distinguished from A. arapapa by the reticulate dorsal color pattern (uniform color pattern in A. arapapa ), loreal region slightly concave (loreal region flattened in A. arapapa ), medium-sized legs, sum of thigh and tibia lengths 89–91 % of snout-vent length (short legs in A. arapapa , sum of thigh and tibia lengths 78–82 % of snout-vent length), and nostrils in lateral position (nostrils dorsolateral in A. arapapa ). Aparasphenodon pomba sp. nov. is distinguished from A. bokermanni by its reticulate dorsal color pattern (uniform color pattern in A. bokermanni ), medium size (large size in A. bokermanni , SVL 71-81 mm), subarticular palmar tubercle of Finger IV bifid (subarticular palmar tubercles rounded in all fingers in A. bokermanni ), canthus rostralis slightly elevated and almost straight (canthus rostralis prominent in A. bokermanni ), supra-tympanic fold barely distinct, extending from the posterior margin of the eyelid to the posterior region of the tympanic ring (supra-tympanic fold thick, distinct and extending from the posterior eyelid margin to the arm insertion in A. bokermanni ) and red iris (dark-brown iris in A. bokermanni ). Aparasphenodon pomba sp. nov. is distinguished from A. venezolanus by having the snout almost rounded in dorsal view and acute in profile (snout pointed in dorsal view and rounded in profile in A. venezolanus ), canthus rostralis slightly elevated and almost straight (canthus rostralis distinct and concave in A. venezolanus ), third subarticular tubercle rounded (third subarticular tubercle bifid in A. venezolanus ), dorsal surface of thigh with cream-colored reticulate pattern on dark-brown background (dorsal surface of thigh with four dark-brown transverse stripes in A. venezolanus ), ventral surface with cream-colored spots (color uniform in A. venezolanus ), single subgular vocal sac (paired lateral vocal sacs in A. venezolanus ) and red iris (iris grayish with dark vermiculation in A. venezolanus ).
Geographic distribution. Known only from the type locality, in the Municipality of Cataguases, State of Minas Gerais, southeastern Brazil ( Fig. 5 View FIGURE 5 ).
Natural history. The holotype was collected during the day inside a bamboo culm ( Bambusa vulgaris ) that had a small slit. All paratypes were found active during the night, during or after rains, occupying the same bamboo grove, at heights from 0.8 to 5.0 m. Bambusa vulgaris is native to Asia (Lima Neto 2010); the bamboo grove where the type series was collected has been in the area for about 70 years and its origin is unknown. Aparasphenodon pomba closes its eyes and contracts its body when manipulated ( Fig. 4 View FIGURE 4 B). The new species occurs in sympatry with other three hylid species, Hypsiboas faber , Scinax eurydice , and Scinax sp. (gr. catharinae). We did not find A. pomba males in calling activity.
Habitat. Aparasphenodon pomba was found in a locality named Sítio Boa Sorte (21º20’20”S, 42º45’43”W; 288 m a.s.l.), which comprises an area of 135.52 hectares located on the border of the municipalities of Cataguases and Dona Euzébia, in the “Zona da Mata of Minas Gerais. This area is within an Atlantic Rain Forest fragment characterized as Submontane Seasonal Semideciduous Forest (Veloso et al. 1991). This region is currently highly fragmented, with mainly pastureland between forest remnants.
The forest fragment lies within the Pomba River sub-basin of the Paraíba do Sul River basin. The mean annual rainfall in the region is around 1200 mm, with a rainy season from October to March and a dry season from April to September. The predominant climate is Aw (tropical hot and humid) in the Köppen classification, with an annual mean temperature of 24.5ºC.
Remarks. The environment of the only known locality of Aparasphenodon pomba covers only a small area, and its known range is less than 10 km 2 (actually only 1.36 km 2). There are no protected areas close to the A. pomba type locality (Sítio Boa Sorte), a forest fragment that is highly impacted by human activities because of its proximity to the urban area of the municipality of Cataguases. The Atlantic Forest of southeastern Brazil is the most intensively studied region in the country, and since the 1990s areas close to the type locality of this new species have been repeatedly surveyed for amphibians. Apparently, A. pomba is at critical risk of becoming extinct within a very short period of time, as its presumed range is not included in any conservation unit and is entirely within privately owned land.
However, the finding of the new species only in a specific climatic conditions and associated with a bamboo grove environment also suggests subsampling in previous studies conducted in the Atlantic Forest in southeastern Brazil. Based on the criteria and categories of the IUCN Red List (Version 3.1, 2007), these data justify the assignment of A. pomba both the Critically Endangered category (CR) as in the Data Deficient category (DD).
Etymology. The specific name of the new species, a noun in apposition, refers to its discovery in an Atlantic Rain Forest fragment near the Pomba River, Cataguases, Minas Gerais.
TABLE 1. Range, mean and standard deviation (SD) of the measurements (mm) of Aparasphenodon pomba sp. nov. Character Males (n = 4) Females (n = 4)
| Range | Mean | SD | Range | Mean | SD | |
|---|---|---|---|---|---|---|
| SVL | 51.6–60.5 | 56.8 | 4.05 | 58.7–62.1 | 61.1 | 1.65 |
| HL | 16.2–19.6 | 18.4 | 1.48 | 19.0–20.7 | 20.2 | 0.77 |
| HW | 15.4–18.6 | 16.9 | 1.32 | 17.2–20.2 | 18.9 | 1.24 |
| ED | 4.8–5.6 | 5.0 | 0.44 | 5.1–6.2 | 5.6 | 0.44 |
| UEW | 3.2–4.6 | 3.9 | 0.65 | 4.1–4.4 | 4.3 | 0.16 |
| IOD | 5.2–7.4 | 6.7 | 1.06 | 6.7–8.0 | 7.6 | 0.6 |
| IND | 3.9–4.6 | 4.2 | 0.35 | 4.0–5.1 | 4.7 | 0.53 |
| TD | 2.8–3.5 | 3.1 | 0.29 | 3.1–4.1 | 3.7 | 0.42 |
| END | 6.1–7.0 | 6.7 | 0.46 | 7.2–8.2 | 7.8 | 0.47 |
| NSD 3FD | 2.1–2.9 2.0–3.1 | 2.5 2.4 | 0.36 0.46 | 2.5–3.1 2.5–3.0 | 2.7 2.7 | 0.26 0.22 |
| THL | 21.9–27.0 | 24.1 | 2.11 | 24.2–27.6 | 26.2 | 1.44 |
| TL | 24.3–28. 6 | 26.2 | 1. 8 | 25.9–29.4 | 28.3 | 1.57 |
| FL | 33.8–39.3 | 35.6 | 2.56 | 37.1–41.6 | 39.7 | 2.06 |
| 4TD | 2.0–2.8 | 2.2 | 0.39 | 2.5–3.0 | 2.8 | 0.18 |
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