Research Article |
Corresponding author: Carolina Reyes-Puig ( carolina_reyes.88@hotmail.com ) Academic editor: Johannes Penner
© 2018 Mario H. Yánez-Muñoz, Carolina Reyes-Puig, Juan Pablo Reyes-Puig, Julián A. Velasco, Fernando Ayala-Varela, Omar Torres-Carvajal.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Yánez-Muñoz MH, Reyes-Puig C, Reyes-Puig JP, Velasco JA, Ayala-Varela F, Torres-Carvajal O (2018) A new cryptic species of Anolis lizard from northwestern South America (Iguanidae, Dactyloinae). ZooKeys 794: 135-163. https://doi.org/10.3897/zookeys.794.26936
|
A new species of Anolis lizard from the Andean slopes of southwestern Colombia and northwestern Ecuador, from between 1187 and 2353 m in elevation, is described. The new species can be distinguished from other Anolis in squamation, cranial osteology, hemipenial morphology, and nuclear and mitochondrial DNA. The new species is sister to Anolis aequatorialis, and it is suggested that previous records of A. aequatorialis in Colombia correspond to the new species described herein.
Describimos una nueva especie de Anolis de las estribaciones de los Andes del suroccidente de Colombia y noroccidente de Ecuador, entre los 1187 y 2353 metros de elevación. La nueva especie puede ser distinguida de otros Anolis por caracteres de escamación, osteología craneal, morfología hemipenial, y ADN nuclear y mitocondrial. La nueva especie es hermana de A. aequatorialis, por lo que sugerimos que los registros previos de A. aequatorialis en Colombia corresponden a la nueva especie descrita en este artículo.
Anolis dracula sp. n., diversity, morphology, phylogeny, Squamata , taxonomy
Anolis dracula sp. n., diversidad, filogenia, morfología, Squamata , taxonomía
Anolis lizards (anoles) are members of a diverse clade with 427 recognized species (
The taxonomic knowledge on Ecuadorian and Colombian anole lizards increased significantly in the 60’s and 70’s through contributions by Ernest Williams and other herpetologists, who described almost 70% of all anole species (
Herein we describe a new cryptic species of Anolis from northern Ecuador and southern Colombia, similar in morphology to A. aequatorialis Werner, 1894. In addition, we use DNA sequence data to infer its phylogenetic position within the Dactyloa clade (
We examined specimens of Anolis within the Dactyloa clade (
We adopted the unified species concept (
We used the character terminology proposed by
From the
Total genomic DNA was digested and extracted from liver or muscle tissue using a guanidinium isothiocyanate extraction protocol. Tissue samples were first mixed with Proteinase K and a lysis buffer and digested overnight prior to extraction. DNA samples were quantified using a Nanodrop ND-1000 (NanoDrop Technologies, Inc.), re-suspended and diluted to 25 ng/ul in ddH2O prior to amplification.
Using primers and amplification protocols from the literature (
Anolis dracula sp. n. vouchers, locality data, and GenBank accession numbers for gene sequences generated for this study.
Paratype voucher | GenBank accession number | ||
---|---|---|---|
COI | ND2 | RAG1 | |
|
MH727638 | MH733476 | MH727641 |
|
MH727637 | MH733475 | MH727640 |
|
MH727636 | MH733474 | MH727639 |
Given that the new species is very similar to Anolis aequatorialis, we performed a comparison using univariate t-tests for independent samples to evaluate quantitative differences between the two species (for normal data), and a Wilcoxon-Mann Whitney test for differences in squamation (for non-normal data). We conducted the Shapiro-Wilk normality test for the distribution of the data (Table
Shapiro-Wilk normality test for measurements and lepidotic characters of Anolis dracula sp. n. Asterisks indicate the degree of significance, * α = p < 0.05, ** α = p < 0.01.
Character | Shapiro-Wilk normality test p (α 0.05) | |
---|---|---|
A. dracula sp. n. | A. aequatorialis | |
Scales between second canthals | 0.00423** | 3.83E-05** |
Postrostrals | 0.0002318** | 0.02137* |
Loreal rows | 2.42E-07** | 3.60E-08** |
Scales between supraorbital semicircles | 0.0001281** | 3.60E-05** |
Scales between interparietal and semicircles | 2.12E-06** | 7.18E06** |
Supralabials to below center of eye | 9.79E-08** | 4.39E-08** |
Postmentals | 6.88E-06** | 0.006722** |
Lamellae under phalanges III-IV of fourth toe | 0.02271* | 0.001285** |
Head length | 0.4423 | 0.4422 |
Head width | 0.364 | 0.1512 |
Head height | 0.2718 | 0.8316 |
Jaw length | 0.6772 | 0.5041 |
Snout length | 0.947 | 0.2273 |
Forelimb length | 0.918 | 0.9827 |
Hindlimb length | 0.944 | 0.873 |
Axilla-groin length | 0.126 | 0.07 |
Snout-vent length | 0.1187 | 0.5671 |
Tail length | 0.7504 | 0.07 |
Dewlap length | 0.2672 | 0.0743 |
Dewlap height | 0.6148 | 0.06 |
Interparietal scale length | 0.729 | 0.4702 |
Tympanum length | 1.647 | 0.8122 |
Editing, assembly, and alignment of sequences were performed in Geneious ProTM 5.3 (
Phylogenetic relationships were assessed under a Bayesian approach in MrBayes 3.2.0 (
Holotype.
Comparison of Anolis dracula sp. n. with similar species. From top to bottom: male of A. dracula, Holotype
Dewlap of Anolis dracula sp. n. and three similar species. A male of A. dracula, paratype
Dorsal color pattern in preservative of Anolis dracula sp. n. From left to right: Male paratype
Flank color pattern in preservative of Anolis dracula sp. n. From top to bottom: Male paratype
Comparison of lepidotic characters, with Wilcoxon-Mann Whitney tests, between Anolis dracula sp. n. and A. aequatorialis, from Ecuador and Colombia. For each character the Z and p values are given, after range and sample size (in parenthesis), and mean/median ± standard deviation for each species. Asterisks indicate the degree of significance, * α = p < 0.05, ** α = p < 0.01.
Character | A. dracula sp. n. | A. aequatorialis | Z | p |
---|---|---|---|---|
Scales between second canthals | 13–17 (34) 14/14.8 ± 1.1 | 12–17 (31) 16/14.8 ± 0.9 | 0.89324 | 0.2153 |
Postrostrals | 6–9 (34) 6/6.7 ± 0.9 | 5–8 (31) 7/6.6 ± 0.9 | -0.30575 | 0.7598 |
Loreal rows | 8–11 (34) 9/9.5 ± 0.6 | 7–10 (31) 9/8.5 ± 0.1 | -4.312 | 1.618E-05*** |
Scales between supraorbital semicircles | 2–5 (34) 4/4 ± 0.7 | 3–5 (31) 4/4.2 ± 0.5 | 1.3692 | 0.1709 |
Scales between interparietal and semicircles | 5–7 (34) 6/6.1 ± 0.9 | 5–8 (31) 6/6.6 ± 0.8 | 2.3944 | 0.01639* |
Supralabials to below center of eye | 6–8 (34) 7/6.8 ± 0.5 | 5–7 (31) 6/6.1 ± 0.5 | -5.8868 | 2.19E-08*** |
Postmentals | 6–9 (34) 6/6.5 ± 0.9 | 5–8 (31) 7/6.7 ± 0.7 | 0.90126 | 0.3675 |
Lamellae under phalanges III–IV of fourth toe | 18–23 (34) 20/20.1 ±1.2 | 19–23 (31) 21/20.7 ±1.1 | 2.5284 | 0.01107* |
Comparison of morphometric characters, with t-test, between Anolis dracula sp. n. and A. aequatorialis, from Ecuador and Colombia. For each character, the F, t, and p values are given, after range, sample size (in parenthesis), and mean ± standard deviation for each species. Asterisks indicate the degree of significance, * α = p < 0.05, ** α = p < 0.01.
Character | A. dracula sp. n. | A. aequatorialis | F | p | t | p |
---|---|---|---|---|---|---|
Head length | 16.8–25.7 (34) 20.6 ± 2.2 | 18.1–25 (31) 21.5 ± 1.9 | 0.98311 | 0.9644 | 2.1842 | 0.03328* |
Head width | 8.4–13.1 (34) 11.1 ± 1.2 | 0.3–15.9 (31) 12 ± 1.2 | 0.712 | 0.3549 | 2.9933 | 0.003981** |
Head height | 7.2–16 (34) 10.8 ± 1.6 | 8.8–14.5 (31) 10.9 ± 1.3 | 0.6615 | 0.2609 | 0.49648 | 0.6213 |
Jaw length | 12–22.2 (34) 16 ± 2.3 | 12.3–20.6 (31) 16 ± 1.9 | 0.73959 | 0.4111 | 1.0628 | 0.2921 |
Snout length | 7.6–13 (34) 9.7 ± 1.2 | 8.3–12.9 (31) 10.2 ± 1.1 | 0.71868 | 0.3682 | 1.9703 | 0.05* |
Forelimb length | 31.2–51.8 (34) 41.3 ± 4.3 | 35.1–58.8 (31) 45.6 ± 5.4 | 1.2386 | 0.5567 | 3.4396 | 0.001056** |
Hindlimb length | 57.4–92.5 (34) 73 ± 7.7 | 61.9–99.9 (31) 79.1 ± 8.3 | 0.99276 | 0.9857 | 2.999 | 0.003917** |
Axilla-groin length | 23.2–45.2 (34) 34.7 ± 4.8 | 27.5–43.8 (31) 36 ± 4.3 | 0.66547 | 0.2677 | 1.1778 | 0.2435 |
Snout-vent length | 53.4–91 (34) 76.2 ± 8.5 | 61.4–106 (31) 82.9 ± 9.2 | 1.1642 | 0.6758 | 2.9648 | 0.00431** |
Tail length | 147–256 (34) 201.7 ± 28.6 | 110–270 (31) 178.3 ± 41.6 | 0.55363 | 0.2125 | -1.5182 | 0.1341 |
Dewlap length | 21.5–56 (34) 39 ± 8.4 | 22.2–59 (31) 40.5 ± 7.3 | 0.66178 | 0.2613 | 0.88446 | 0.3799 |
Dewlap height | 9.5–31.3 (34) 19 ± 5.9 | 7.11–39.5 (31) 20.3± 3.3 | 1.0045 | 0.9887 | 0.84217 | 0.403 |
Interparietal scale length | 1.1–2.2 (34) 1.5 ± 0.3 | 0.8–1.6 (31) 1.2 ± 0.2 | 0.98311 | 0.9644 | -4.439 | 3.8e-05*** |
Tympanum length | 2.1–3.5 (34) 2.6 ± 0.3 | 2.0–4.1 (31) 2.8 ± 0.4 | 1.7784 | 0.1163 | 2.2627 | 0.0272* |
Sexual variation in lepidosis and measurements (mm) in Anolis dracula sp. n.; range followed by mean and standard deviation.
Character | Males | Females |
---|---|---|
N = 21 | N = 13 | |
Scales between second canthals | 14–16, 14.7 ± 1 | 13–17, 14.8 ± 1.2 |
Postrostrals | 6–9, 6.9 ± 1.2 | 6–8, 6.5 ± 0.7 |
Row of loreals | 9–11, 9.6 ± 0.6 | 9–11, 9.5 ± 0.6 |
Scales between supraorbital semicircles | 4–5, 4.2 ± 0.4 | 2–5, 3.7 ± 0.8 |
Scales between interparietal and semicircles | 5–7, 5.7 ± 0.8 | 5–7, 6.4 ± 0.8 |
Supralabials to below center of eye | 6–8, 6.7 ± 0.6 | 6–8, 6.8 ± 0.5 |
Postmentals | 6–9, 6.9 ± 1.2 | 6–7, 6.2 ± 0.4 |
Lamellae under phalanges III–IV of fourth toe | 18–22, 19.6 ± 1.2 | 19–23, 20.5 ± 1.1 |
Head length | 19.1–25.74, 22 ± 1.9 | 16.5–21.72, 19.1 ± 1.9 |
Head width | 9–13.1, 11.11 ± 1.3 | 8.4–11.1, 10.2 ± 0.8 |
Head height | 9.1–16, 12 ± 1.9 | 7.2–11.2, 9.8 ± 1.1 |
Jaw length | 12–17, 14.2 ± 1.6 | 14.8–22.2, 17.8 ± 2.8 |
Snout length | 8.6–13, 10.4 ± 1.3 | 7.6–10.8, 9 ± 1 |
Forelimb length | 39.1–51.8, 46.4 ± 4.1 | 31.2–44.7, 38.1 ± 3.8 |
Hindlimb length | 57.4–77.5, 67.8 ± 6.3 | 62.1–92.5, 76.9 ± 8.5 |
Axilla-groin length | 23.2–37.6, 30.6 ± 4.6 | 30.6–45.2, 36.5 ± 4.5 |
Snout-vent length | 66.6–90.9, 80.2 ± 7.3 | 53.4–80.2, 69.4 ± 8.6 |
Tail length | 183–256, 213 ± 26.1 | 147–241, 187.6 ± 30.9 |
We assign Anolis dracula to the Dactyloa clade within Anolis (
Anolis dracula is most similar in morphology and coloration to A. aequatorialis (character states in parentheses), but differs from it in the following characters: large and robust hemipenes, 14 mm (4.7 mm; W = 0; p = 0.004), with a well-developed spermatic sulcus (hemipenis small; Figure
Cranial osteology of 1 Anolis dracula sp. n. (
Cranial osteology of 1 Anolis dracula sp. n. (
Among dactyloid species from Ecuador and Colombia, Anolis dracula is similar in color and morphology to A. fitchi and A. podocarpus. However, both species occur east of the Andes in Ecuador and they can be distinguished (character states in parentheses) from A. dracula by the following characters: hemipenis with slightly defined lobules, which means that the outline of the lobules are not clearly distinguishable from the trunk (lobules well defined), and twice as long as hemipenes of A. fitchi and A. podocarpus, hemipenis length in A. dracula 14 mm (A. fitchi 7 mm; A. podocarpus 6 mm; Figure
Other Dactyloa species distributed in the lowlands and foothills of western Ecuador and Colombia and somewhat similar to Anolis dracula are A. chloris, A. fasciatus, A. gemmosus, A. otongae, A. parilis, A. poei and A. ventrimaculatus. However, these species are smaller in SVL (range between 56 – 80 mm) and hemipenial length than A. dracula and have dewlaps with a white background (brown or reddish brown in A. dracula).
Finally, although the average ND2 genetic distance between A. dracula and its closest relative A. aequatorialis is relatively low (0.049), it is comparable to DNA divergences between other species pairs, such as Anolis heterodermus versus Anolis inderenae (0.042) and Anolis anatoloros versus Anolis jacare (0.041).
(paratype data in parentheses).Head: Frontal depression present; head dorsal scales small and keeled in frontal and nasal regions; internasals smooth; parietal region with granular scales; post-rostrals seven (6–9), fourth enlarged; nasal contacting rostral; circumnasal round, separated from rostral by one scale; external naris separated from rostral by three scales, not contacting supralabial; supraorbitals larger than adjacent scales, polygonal, rugose, and separated by two scales from supraorbital semicircles; supraocular disk with small, keeled scales of similar size; parietals heterogeneous in size, slightly quadrangular and keeled; scales between interparietal and supraorbital semicircles heterogeneous in size; interparietal larger than wide, slightly rhomboid, much larger than adjacent scales (10 ×), similar in size to ear opening, and separated by 2–3 small scales from supraorbital semicircles; scales between interparietal and nape 13; parietal scales keeled; canthals keeled; nasal scale single; canthal scales nine (8–9); anterior canthals contacting circumnasals; scales between first canthals 17 (14–17); scales between second canthals 14 (13–17); loreal rows 8 (8–11), keeled, horizontal, upper contacting canthals; preoculars four; subocular scales seven, separated from supralabials by 1–2 scale rows; temporals small and granular, not in rows or series; supralabials seven (6–8); ear opening oval-shaped, surrounded by small granular scales; anterior edge of rostral ventrally visible; mental semicircular, concave and divided; infralabials in seven rows; sublabials absent; postmentals 9 (6–9).
Dewlap: 56 mm long and 31.3 mm high (males 46 ± 7 mm [33–56] in length, 22.8 ± 4.8 mm [17.3–30.4] in width, n = 21; females 34 ± 8 mm [21.5–49] in length, 15 ± 4 mm [10–23] in width, n = 13); dewlap extending posterior to arms in males and slightly beyond the insertion of the arms in females; dewlap longitudinal scale rows seven (5–8), separated by naked skin; clusters of dewlap scales broad and colored.
Trunk: Middorsal and paravertebral scales small and keeled, slightly larger than flanking scales, which are granular/conical and separated by small skin interspaces; ventral scales smooth, subimbricate, larger than dorsals; groin, axilla and neck covered by granular scales; nuchal and dorsal folds present, reduced in females; two enlarged postanals in males.
Limbs: Fore and hind limbs with keeled scales; hind limbs more robust, 1.8 times longer than forelimbs; lamellae of subdigital pad of fourth toe 19 (18–23; counted in the manner of
Tail: Cylindrical, with keeled scales at the base, others imbricated; 125% longer than snout-vent length.
Color in life (holotype and paratypes): Anolis dracula is chromatically variable depending on sex, emotional stress, and perch type (Figure
Color in preservative (holotype and paratypes preserved between two and ten years): Dorsum in males bluish grey, flanks whitish pale-blue, with light or black hourglass-shaped spots, belly grey or bluish cream (Figs
Hemipenis (Figure
Skull (based on
Anolis dracula occurs on the foothills of the Andes of southwestern of Colombia and northwestern Ecuador. It has been recorded in the provinces of Carchi and Imbabura, Ecuador, and the department of Nariño, Colombia, between 1187–2353 m in elevation. The known distributional area of A. dracula is relatively small, approximately 1582 km2 (Figure
Anolis dracula was the most common species of anole during surveys conducted by the Herpetological Division from Instituto Nacional de Biodiversidad de Ecuador during the June-August period in 2015 and 2016 at Cerro Oscuro in the Dracula Reserve. Specimens were collected in mature and secondary forests, degraded areas with pastures and native vegetation, as well as along the edges of secondary roads. Almost all specimens were found sleeping at night on leaves of Araceae, Arecaceae, and pteridophytes, between 0.6 and 2.3 m above the ground.
Occasional observations during 2016 (March-June) suggest that A. dracula shows sleeping-perch fidelity and is active on the ground. A female was observed sleeping on the same leaf of Araceae for two consecutive nights. In the same field trip, we observed two females in clear and sunny days starting thermoregulatory behavior at 7 am, with slight head movements and small jumps between branches. As the sun rose, the females moved down to the ground. A male was observed foraging on leaf litter at noon. In addition, several specimens were collected in pitfall traps. Some individuals were observed on leaf litter during the day, with cryptic coloration (brown color), whereas at night, most specimens were greenish.
Stomach contents revealed at least 10 prey items and three species of parasites. The most diverse prey was Coleoptera (4 spp.), followed by Hymenoptera (3 spp., including two Formicidae), Arachnida (1 sp.), Diptera (1 sp.), and Lepidoptera (1 sp.). Ants (Hymenoptera) were the most frequent stomach content (44%), followed by Nematoda (21%), plant material (14%), and Coleoptera, Opiliones, Araneidae, and Diptera (21%).
The specific epithet dracula it is a noun in apposition that refers to the Dracula Reserve, located within the distribution of the new species and near its type locality. The Dracula Reserve is an initiative of the EcoMinga Foundation, sponsored by the Orchid Conservation Alliance, Rainforest Trust, University of Basel Botanical Garden, and their individual donors. The Reserve protects an area with a high diversity of orchids of the genus Dracula.
The Bayesian analysis estimated Anolis dracula to be sister to A. aequatorialis, with strong support (Figure
Phylogeny of Dactyloa including Anolis dracula sp. n., 50% majority-rule consensus tree obtained from a Bayesian analysis of 117 specimens, two mitochondrial genes (COI, ND2) and one nuclear gene (RAG1). Numbers above branches correspond to Bayesian posterior probability (PP) values; asterisks represent PP ≥ 0.95; scale bar corresponds to the mean number of nucleotide substitutions per site. Photographs from top to bottom: Anolis podocarpus (Santiago R. Ron-BIOWEB), A. fitchi (Juan C. Sánchez-BIOWEB), A. aequatorialis (Diego Quirola-BIOWEB), A. dracula (Mario Yánez-Muñoz).
Distribution of Anolis dracula sp. n. and A. aequatorialis. White star represents the type locality of A. dracula and the black star the type locality of A. aequatorialis. The blue line corresponds to the Mira River Basin. The black triangles indicate samples used in the phylogeny for each species. The source of the raster layer for the map is from naturalearthdata.com.
Although
Anolis dracula is nested within the Dactyloa clade of Anolis, which is in turn well supported by morphological and molecular data (
Unlike many recently described species of anoles (e.g.,
The hemipenis of Anolis dracula is proportionally larger than that of its sister species, A. aequatorialis. However, further studies are necessary to evaluate whether this sexual morphological difference may have led to the divergence of these two highly cryptic sister species.
For the access to specimens under his care, we thank to Raúl Sedano of Colección Herpetológica de la Universidad del Valle del Cauca (
Additional specimens examined
Anolis dracula sp. n.: Carchi:
Anolis aequatorialis: Pichincha:
Anolis fitchi: Tungurahua:
Anolis podocarpus: Zamora Chinchipe: