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36 results for “Helicops”
Fig. 5 in Evidence for cryptic diversity in the Neotropical water snake, Helicops angulatus (Linnaeus, 1758) (Dipsadidae, Hydropsini), with comments on its ecology, facultative reproductive mode, and conservation
Fig. 5. Illustration of the holotype of Coluber surinamensis Shaw. From Sebae (1735, Vol. 2, pl. 59, Fig. 2).
Fig. 3 in Evidence for cryptic diversity in the Neotropical water snake, Helicops angulatus (Linnaeus, 1758) (Dipsadidae, Hydropsini), with comments on its ecology, facultative reproductive mode, and conservation
Fig. 3. Best Maximum Likelihood tree based on the data set of concatenated 12S and 16S rDNA, and c-mos sequences. The red clade depicts the Helicops angulatus group. On the left and right sides of a slash (/) are values indicated at nodes for Maximum Likelihood bootstraps (> 75%) and Bayesian Posterior probability values (> 95%), respectively. Green clades represent the paraphyly of Helicops angulatus. The name Helicops pictiventris is currently a junior synonym of H. infrataeniatus, but it appears in the tree exactly as the pertinent sequences appear in the GenBank dataset.
Fig. 1 in Evidence for cryptic diversity in the Neotropical water snake, Helicops angulatus (Linnaeus, 1758) (Dipsadidae, Hydropsini), with comments on its ecology, facultative reproductive mode, and conservation
Fig. 1. The distribution of Helicops angulatus in the Neotropics. Locality data is from the VertNet and GBIF databases, as well as the literature. Diamonds (green oviparous, yellow viviparous): specimens reported in Appendix B of Braz et al. (2016); red stars represent localities where Helicops was sampled for DNA; small black markers: localities from Helicops angulatus map in Nogueira et al. (2019). As currently defined Helicops angulatus occurs in Freshwater Ecoregions: 301 North Andean Pacific Slopes, Rio Atrato; 302 Magdalena, Sinu; 304 South America Caribbean Drainages, Trinidad; 307 Orinoco Llanos; 308 Orinoco Guiana Shield; 311 Guianas; 313 Western Amazon Piedmont; 317 Ucayali, Urubamba Piedmont; 318 Mamore, Madre de Dios Piedmont; 319 Guapore, Itenez; 320 Tapajos, Juruena; 321 Madeira Brazilian Shield; 323 Amazonas Estuary and Coastal Drainages; 324 Tocantins, Araguaia; 325 Parnaiba; and 328 Northeastern Mata Atlantica.
Linked collectors and determiners for: On the status of Helicops wettsteini Amaral, 1929, a senior synonym of Hypsiscopus murphyi (SERPENTES: Homalopsidae).
Natural history specimen data linked to collectors and determiners held within, "On the status of Helicops wettsteini Amaral, 1929, a senior synonym of Hypsiscopus murphyi (SERPENTES: Homalopsidae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/76fe0980-887f-48e4-a5c7-88b0cee0224d">https://bionomia.net/dataset/76fe0980-887f-48e4-a5c7-88b0cee0224d</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/76fe0980-887f-48e4-a5c7-88b0cee0224d">https://gbif.org/dataset/76fe0980-887f-48e4-a5c7-88b0cee0224d</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: Distribution and identification of the species in the genus Helicops Wagler, 1830 (Serpentes, Colubridae, Xenodontinae).
Natural history specimen data linked to collectors and determiners held within, "Distribution and identification of the species in the genus Helicops Wagler, 1830 (Serpentes, Colubridae, Xenodontinae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/07dc09bc-1a14-4846-b1f2-0ebba83ed4ad">https://bionomia.net/dataset/07dc09bc-1a14-4846-b1f2-0ebba83ed4ad</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/07dc09bc-1a14-4846-b1f2-0ebba83ed4ad">https://gbif.org/dataset/07dc09bc-1a14-4846-b1f2-0ebba83ed4ad</a>. Formatted as a Frictionless Data package.
Videos of the new specimens of Helicops boitata (Serpentes: Dipsadidae: Hydropsini), with data on morphological variation and behavior
<p>We report information on morphological variation and behavior of the recently described watersnake <em>Helicops boitata</em>, previously known strictly from the holotype. Our data come from five new specimens fortuitously found in a private area near the type locality, in the Brazilian Pantanal wetlands. The expanded sample revealed polymorphism in at least two scalation features assumed as diagnostic of the species (i.e., undivided condition of the cloacal plate and nasal scales) and confirmed the uniqueness of the ventral color pattern, as well as the divided condition of the foremost ventral shields. Besides, as reported for the holotype, three individuals collected alive also exhibited harmless behavior when handled, a rather unusual feature among snakes of the genus <em>Helicops</em>. Other new behavioral observations include a mostly nocturnal activity (in contrast with the previous data) and the ability to dig galleries in the soft substrate when attempting to escape. The finding of five individuals very close to each other suggest aggregations in habitats retaining humidity in the dry season of the Pantanal. Low abundance rates and possible habitat restrictions might render <em>Helicops boitata</em> particularly susceptible to seasonal fire episodes that consume large extensions of the wetlands, including dry swamps in which aquatic reptiles find refuge during the seasonal droughts.</p>
Fig. 6 in Evidence for cryptic diversity in the Neotropical water snake, Helicops angulatus (Linnaeus, 1758) (Dipsadidae, Hydropsini), with comments on its ecology, facultative reproductive mode, and conservation
Fig. 6. The lectotype of Natrix asper Wagler. Photos by Michael Franzen.
Fig. 7 in Evidence for cryptic diversity in the Neotropical water snake, Helicops angulatus (Linnaeus, 1758) (Dipsadidae, Hydropsini), with comments on its ecology, facultative reproductive mode, and conservation
Fig. 7. The holotype of Helicops fumigatus Cope, 1868. Photo by Ned Gilmore.
Fig. 4. NRM 17 in Evidence for cryptic diversity in the Neotropical water snake, Helicops angulatus (Linnaeus, 1758) (Dipsadidae, Hydropsini), with comments on its ecology, facultative reproductive mode, and conservation
Fig. 4. NRM 17, the holotype for Helicops angulatus. Photo courtesy of NRM.
Videos of the new specimens of Helicops boitata (Serpentes: Dipsadidae: Hydropsini), with data on morphological variation and behavior
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FIGURE 6 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 6. Asulcate (left) and sulcate (right) faces of the fully everted and maximally expanded right hemipenis of the paratype of Helicops phantasma (MZUSP 19319), from the municipality of Carolina, state of Maranh"o, Brazil. Scale bar = 10 mm
FIGURE 7 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 7. Asulcate (right) and sulcate (left) faces of the fully everted and maximally expanded right hemipenis of Helicops leopardinus (UFMT-R 1504) from the municipality of Cuiabá, state Mato Grosso, Brazil (above), and Helicops danieli (AMNH 97461), from state of Bolivar, Colombia. Scale bars = 10 mm.
FIGURE 5 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 5. Localities of record of Helicops phantasma [black (type locality) and white triangles] and of the present sample of He. leopardinus (black circles). Crosses denote areas of hydroelectric dams already installed or projected to the future in the Tocantins-Araguaia Basin. Gray shading illustrates the main hydrographic basins of Central and Northern Brazil (1: Amazon Basin; 2: Tocantins-Araguaia Basin; 3: Atlantico Norte and Nordeste Basins; 4 S"o Francisco Basin; 5: Atlantico Leste Basin, and 6: Paraná Basin).
FIGURE 4 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 4. Dorsal, lateral, and ventral views of the head of the holotype of Helicops phantasma sp. nov. (UFMT-R 8290) from the region of the municipality of Barra do Garças, state of Mato Grosso, Brazil. Scale bar = 10 mm.
FIGURE 3 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 3. Dorsal and ventral views of the holotype of Helicops phantasma sp. nov. (UFMT-R 8290), from the region of the municipality of Barra do Garças, state of Mato Grosso, Brazil. Scale bar = 40 mm.
FIGURE 1 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 1. Illustrations of the syntypes of (A) Helicops leopardinus (Schlegel, 1837) [modified from Jan & Sordelli (1864: f. 2, pl. III)] and (B–C) He. leprieurii Duméril et al., 1854, a junior synonym [modified from Jan & Sordelli (1864: f. 2–3, pl. IV). In both cases, the dorsal pattern consists of rounded black spots.
FIGURE 2 in Long known, brand new, and possibly threatened: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes; Xenodontinae) from the Tocantins- Araguaia River Basin, Brazil
FIGURE 2. Phylogenetic relationships of Hydropsini (one species of Hydrops, one species of Pseudoeryx, and 11 species of Helicops) based on a concatenated matrix of the 12S, 16S, BDNF, C-mos, and NT3 sequence data. Numbers at nodes indicate the values of Bayesian Credibility/Maximum Likelihood bootstrap. The bar represents the number of expected changes per site in the Bayesian Analysis. Terminal H1733 corresponds to the voucher MZUSP 19695. The name Helicops pictiventris is currently in the synonymy of He. infrataeniatus, but appears in the tree exactly as the pertinent sequences appear in the GenBank (see Zaher et al. 2009).
FIGURE 2 in New specimens of Helicops boitata (Serpentes: Dipsadidae: Hydropsini), with data on morphological variation and behavior
FIGURE 2. Records of five new specimens of Helicops boitata (black circles), nearly 10 km straight-line distant from the type locality (white triangle), in the influence area of the Bento Gomes River, municipality of Poconé, state of Mato Grosso, Brazil. Cartographic raster modified from MapBiomas 7 Collection.
FIGURE 1 in New specimens of Helicops boitata (Serpentes: Dipsadidae: Hydropsini), with data on morphological variation and behavior
FIGURE 1. Schematic representation of the terrarium in which three alive individuals of Helicops boitata were maintained for observations for three days.
FIGURE 4 in New specimens of Helicops boitata (Serpentes: Dipsadidae: Hydropsini), with data on morphological variation and behavior
FIGURE 4. Behavioral records of individuals of Helicops boitata maintained in captivity during a period of three days. (A) An individual almost completely buried in the sand of the terrarium, keeping only the head above the surface; (B) two individuals exhibiting the upright posture of the snout, leaning the trunk to a nearly 90° position above the water surface; (C) an individual swimming in open water; (D) detail of the emerging head of an individual in the upright posture of the snout.
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