REDESCRIPTION OF PHALOTRIS NIGRILATUS FERRAREZZI, 1993 (SERPENTES: COLUBRIDAE: XENODONTINAE (original) (raw)
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Phyllomedusa: Journal of Herpetology, 2005
A survey of the southernmost representatives of the tricolor species group, genus Phalotris (Serpentes, Colubridae). Colubrid snakes of the South American genus Phalotris are difficult to detect because of their secretive habits, and thus they are poorly represented in collections. The species Phalotris cuyanus and P. tricolor, the southernmost representatives of the tricolor species group, were studied to determine the limits of intraspecific variation of P. cuyanus and to consolidate the taxonomic relationship between both species, the phenetically and geographically closest members in the group. The distribution of selected external characters (cephalic, ventral and subcaudal scales), coloration pattern, width of white and black collars, and hemipenis morphology were analyzed. Comparative data on the other members of the group, P. mertensi and P. matogrossensis, are briefly discussed. Males of P. cuyanus have a higher number of ventral scales than males of P. tricolor (mean of 220.3 vs. 204.6). Cephalic melanism varies among individuals and does not have discriminant or geographic value for this species group. The white nuchal collar may partially cover the parietal scales in the four species. The black collar is moderately narrow in P. cuyanus, but it can be up to 12 scales wide in P. tricolor. Vertebral dotting is neither constant nor exclusive of any species. The four species of the group are well characterized by combinations of character states for each one. We suggest considering to P. cuyanus as an evolutionary species typical of the Monte biogeographic province.
2010
We report a range extension of Atractus boettgeri, a rare snake endemic to Bolivia. This species differs from Atractus taeniatus by a higher segmental count (well outside the range for A. taeniatus) and by having only 6 maxillary teeth as opposed to 8-9 in A. taeniatus. In addition, A. boettgeri differs from A. emmeli in having 6-6 supralabials (versus 7-7) and fewer ventrals (175-177 versus 181-189 in females). All known records of A. boettgeri indicate an association between this species and the Cerrado vegetation of central Bolivia. This report is also unique in that the specimen reported herein was found in the stomach of a Common Long-Nosed Armadillo (Dasypus novemcinctus). Se reporta una extension de en la distribucion de la especie Atractus boettgeri, una serpiente endemica de Bolivia. Esta especie se diferencia de A. taeniatus por tener un numero segmental muy por encima del intervalo descrito para A. taeniatus y por tener solo 6 dientes maxilares, en vez de 8-9 en A. taenia...
2005
was previously known from a holotype from eastern Pará, and 15 specimens from Rondônia and Acre, all in Brazil. We report on 23 additional specimens from the Brazilian states of Rondônia, Goiás, Mato Grosso, and Mato Grosso do Sul. These specimens extend the known range of A. albuquerquei substantially, and beyond the southern limits of the Amazon basin. The holotype of A. albuquerquei is redescribed and intraspecific variation in external morphology, hemipenes, and colour is documented. Sexual dimorphism exists in total length, and number of ventral (significantly greater in females) and subcaudal scales (greater in males). There is a significant correlation between number of subcaudal scales and longitude (decreasing from East to West) for both males and females.
Revalidation of Herpetodryas reticulata (Peters, 1863) (Serpentes: Colubridae) from Ecuador
the name Herpetodryas reticulata Peters, 1863, is revalidated and assigned to the snakes of the genus Mastigodryas from the dry forests of central and southwestern ecuador. Mastigodryas reticulatus (Peters, 1863) is characterized by the presence of a striped dorsal pattern, with the upper light lateral stripe formed by two scale rows (4 and 5); dorsal scales with dark apical edges; a light, immaculate throat and venter; a higher number of ventral scales; an elongate and nude region on the base of the hemipenis; and thin, enlarged spines located lateral to the sulcus spermaticus on the distal region of the body of the hemipenis. this species is a member of the M. boddaerti Group, along with M. boddaerti and M. heathii.
Review of Bolivian Dipsas (Serpentes: Colubridae), with Comments on Other South American Species
Herpetological Monographs, 2008
Seven species of Dipsas occur within Bolivia. On the basis of new material, we revise D. chaparensis, D. peruana, and D. variegata. We review D. i. cisticeps and consider it to be a subspecies of D. bucephala. We transfer D. boettgeri, D. latifrontalis, and D. polylepis to the synonymy of D. peruana. We consider D. neivai and populations of D. variegata from Bolivia, Brazil, and Peru to be conspecific with Guianan and Venezuelan D. variegata. On the other hand, we recognize D. trinitatis Parker as a morphologically distinct, full species rather than a subspecies of D. variegata. We refer Leptognathus robusta Mü ller to the synonymy of D. oreas rather than D. variegata. Alizarin red staining reveals calcification patterns of snake hemipenes and is recommended as a modification of techniques used to prepare these organs. Characters of visceral morphology improve our understanding of dipsadine relationships. As in most snakes, male Dipsas usually have higher subcaudal counts than females. On the other hand, species of Dipsas either have reverse ventral count dimorphism or their ventral counts are not dimorphic.
Journal of Parasitology, 2007
A new species of Haplometroides (Digenea, Plagiorchiidae) is described from a specimen of Phalotris nasutus (Gomes, 1915) (Serpentes, Colubridae). The host snake was obtained in the municipality of Corumbá, Mato Grosso do Sul State, Brazil. Trematodes were recovered from esophagus, stomach, and small intestine of the host. The main characteristic of the new species is the vitellaria, which is intercecal, cecal, and extracecal in the preacetabular region. A key for identification of the species in Haplometroides is proposed.