scholarly journals Morphological variation and new distributional records of Rhadinella dysmica (Serpentes: Dipsadidae), with comparisons with other dark-colored congeners

2021 ◽  
Vol 20 (2) ◽  
pp. 151-159
Author(s):  
Ricardo Palacios-Aguilar ◽  
Rufino Santos-Bibiano ◽  
Jonathan Atwood Campbell ◽  
Elizabeth Beltrán-Sánchez
Keyword(s):  
Adult Female ◽  
Morphological Variation ◽  
Geographic Range

Small, secretive snakes comprise an important part of the herpetofauna of the Neotropics and yet most species are known from a handful of specimens due to their habits and relatively inaccessible localities. The Mexican endemic Rhadinella dysmica is the westernmost species of the genus and was described based on a single adult female. Herein we provide information on new specimens, including their morphological variation and hemipenial structure, expand the known geographic range for the species, and comment on the morphological similarities of the “dark-colored” species of the genus.

scholarly journals First record of Proechimys pattoni da Silva, 1998 (Rodentia, Echimyidae) in northwestern Bolivia

Check List ◽  
2018 ◽  
Vol 14 (6) ◽  
pp. 1115-1121
Author(s):  
Pamela Sánchez-Vendizú ◽  
Joseph A. Cook ◽  
James Wood ◽  
Jorge Salazar-Bravo
Keyword(s):  
Morphological Variation ◽  
First Record ◽  
Geographic Range ◽  
Lowland Forest ◽  
Molecular Analyses ◽  
First Report ◽  
Diagnostic Characters ◽  
Madre De Dios ◽  
Distributional Range ◽  
Biogeographic Region

Proechimys pattoni da Silva, 1998 is one of the 3 small-bodied species of Proechimys and its geographic range is only known in western Brazil and eastern and southern Peru. However, based on morphological and molecular analyses, we report P. pattoni from the lowland forest of Bolivia (Pando: Rio Madre de Dios, near San Rosa). This is the first report of P. pattoni in Bolivia and extends its distributional range 315 km to the southeast in the Amazon biogeographic region of Bolivia, representing the southeastern most record. Furthermore, we document the karyotype (2n = 40 / FN = 56) and morphological variation in diagnostic characters.

scholarly journals Morphological variation in the hydromedusa genus Polyorchis on the west coast of North America

1980 ◽  
Vol 58 (11) ◽  
pp. 2089-2095 ◽  
Author(s):  
John T. Rees ◽  
R. J. Larson
Keyword(s):  
North America ◽  
Morphological Variation ◽  
West Coast ◽  
Baja California ◽  
Geographic Range ◽  
Valid Species ◽  
The West ◽  
Radial Canal

Morphological variation in the hydromedusan genus Polyorchis on the west coast of North America is analyzed in relation to gonad number, tentacle number, and radial canal diverticula number relative to the height of the bell. In specimens of Polyorchis examined, it is concluded that P. penicillatus (Eschscholtz, 1829) is highly variable morphologically over its known geographic range from Alaska to Baja California. Polyorchis montereyensis Skogsberg, 1948 is considered a synonym of P. penicillatus, and P. haplus Skogsberg, 1948, is retained as a valid species.

scholarly journals MORPHOLOGICAL VARIATION IN THE SINALOAN MOUSE Peromyscus simulus

1995 ◽  
Vol 1 (1) ◽  
pp. 44 ◽  
Author(s):  
David J. Schmidly ◽  
Robert D. Bradley
Keyword(s):  
Geographic Variation ◽  
Morphological Variation ◽  
Conservation Status ◽  
Geographic Range ◽  
Statistical Analyses ◽  
Quantitative Characters ◽  
The Future ◽  
Riparian Habitats

ABSTRACT. We examined geographic and non-geographic variation in 23 quantitative characters of the cranium and body for samples of Peromyscus simulus from throughout the range of the species in Sinaloa and Nayarit, Mexico. Univariate statistical analyses indicated little non-geographic variation associated with either sex or age. Geographic variation was evident among samples, with northern, inland representatives averaging smaller in size and showing some degree of distinction from southern, coastal samples. However, the degree of this differentiation is not sufficient to warrant the delineation of subspecies. Available evidence suggest P. simulus has a relative narrow preference for wetland and riparian habitats within its geographic range. These habitats are subject to increased development in this region of Mexico, and, for this reason, the conservation status of the species should be carefully monitored in the future. RESUMEN. Examinamos la variación geográfica y no geográfica de 23 caracteres cuantitativos del cuerpo y cráneo de muestras de Peromyscus simulus a lo largo de la distribución de la especie en los estados de Nayarit y Sonora, México. Análisis estadísticos univariados mostraron poca variación no geográfica asociada con el sexo o la edad. Fue evidente la variación geográfica en muestras de representantes de islas al norte, siendo estas de menor tamaño en promedio y mostrando una ligera diferencia con respecto a las muestras costeras y más sureñas. Sin embargo, el grado de esta diferenciación no es suficiente para garantizar el límite de una subespecie. La evidencia disponible, sugiere que P. simulus tiene, relativamente, una preferencia por hábitats riparios y humedales dentro de su rango geográfico. El desarrollo de estos hábitats se ha incrementado en las últimas décadas; por esta razón, en el futuro el estado de conservación de la especie debe ser monitoreado cuidadosamente.Key words: Peromyscus simulus, morphological variation, Sinaloan mouse, Sinaloa, Nayarit, México.

REGIONAL DIFFERENCES IN REPRODUCTIVE TRAITS OF THE SNOWSHOE HARE

1966 ◽  
Vol 44 (5) ◽  
pp. 953-961 ◽  
Author(s):  
Lloyd B. Keith ◽  
Orrin J. Rongstad ◽  
E. Charles Meslow
Keyword(s):  
Litter Size ◽  
Adult Female ◽  
Regional Differences ◽  
Reproductive Traits ◽  
Geographic Range ◽  
Lepus Americanus ◽  
Species Range ◽  
Snowshoe Hare ◽  
Breeding Female ◽  
Genetically Determined

Reproductive characteristics of the snowshoe hare (Lepus americanus) over its principal geographic range were summarised. The onset of breeding each spring was chronologically similar throughout a major portion of the species' range, although Alaska hares tended to be about 2 weeks later than those elsewhere. Mean litter size increased significantly from south to north, and studies with captive snowshoes demonstrated that such regional differences are genetically determined. Both the average number of litters, and the average number of young, per adult female per year were greatest at intermediate latitudes. It is suggested that regional differences in mean litter size reflect the general "fitness" of the breeding female and (or) her young relative to their particular environment, as governed by the physiological consequences of species adaptation and of reproduction.

scholarly journals Distribution and morphological variation of Eleutherodactylus mercedesae Lynch & McDiarmid, 1987 (Amphibia, Anura, Leptodactylidae) with first record for Peru

Zootaxa ◽  
2006 ◽  
Vol 1278 (1) ◽  
pp. 49
Author(s):  
JOSÉ M. PADIAL ◽  
ROY McDIARMID ◽  
IGNA DE LA RIVA
Keyword(s):  
Adult Female ◽  
Morphological Variation ◽  
Original Description ◽  
First Record ◽  
Morphological Description ◽  
Cloud Forests ◽  
Southern Peru ◽  
Male Type ◽  
The Andes ◽  
Distributional Information

We report new distributional information for Eleutherodactylus mercedesae in Bolivia, and provide the first record for Peru based on an adult female. This species, previously endemic to Bolivia, now ranges across about 1000 km in cloud forests on the Amazonian slopes of the Andes from southern Peru to central Bolivia. We provide the first morphological description of females based on two specimens, compare them with the male type and paratype, add some observations to the original description, and comment on variation in the species.

scholarly journals Upper altitudinal and southern geographic range extensions for Cruziohyla craspedopus (Anura: Hylidae) (Funkhouser, 1957) in Ecuador

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1648 ◽  
Author(s):  
Darwin Núñez ◽  
Trotsky Riera-Vite ◽  
Flavio Orellana ◽  
Jorge Brito
Keyword(s):  
Adult Female ◽  
Geographic Range ◽  
The South ◽  
Altitudinal Range ◽  
Southern Ecuador

We report the southernmost record of Cruziohyla craspedopus in Ecuador. An adult female was collected in the province of Zamora Chinchipe in southern Ecuador in the Cordillera del Condor. This record increases the previously reported altitudinal range for the species by 468 m and extends the distribution by 105 km to the south.

Does morphological variation buffer against extinction? A test using veneroid bivalves from the Plio-Pleistocene of Florida

Paleobiology ◽  
2011 ◽  
Vol 37 (3) ◽  
pp. 355-368 ◽  
Author(s):  
Sarah E. Kolbe ◽  
Rowan Lockwood ◽  
Gene Hunt
Keyword(s):  
Morphological Variation ◽  
Geographic Range ◽  
Museum Specimens ◽  
Species Pair ◽  
Study Region ◽  
Landmark Data ◽  
The Face ◽  
The Mean ◽  
The Relationship ◽  
Procrustes Superimposition

Although morphological variation is known to influence the evolutionary fates of species, the relationship between morphological variation and survivorship in the face of extinction-inducing perturbations is poorly understood. Here, we investigate this relationship for veneroid bivalves in association with the Plio-Pleistocene extinction in Florida. Fourteen pairs of related species were selected for analysis, with each pair including one species that survived the Plio-Pleistocene extinction and another that became extinct during the interval. Morphological landmark data were acquired for more than 1500 museum specimens, representing 19 localities that encompass four well-known Plio-Pleistocene units in the study region. Procrustes superimposition was applied to each sample, and overall multivariate variation was calculated as the mean squared partial Procrustes distance between specimens and their mean form. Morphological variation was calculated at three geographic scales for each species, and differences in variation between survivors and victims were examined within each species pair. Results indicate that species surviving the Plio-Pleistocene extinction were significantly more variable morphologically than victims. Greater morphological variation may promote survivorship by directly enhancing species adaptations to changing conditions or by permitting the occupation of a larger geographic range. Alternatively, high morphological variation and survivorship may both be mediated by a third variable, such as large geographic range.

Phenacoccus solenopsis Tinsley (Sternorrhyncha: Coccoidea: Pseudococcidae), an invasive mealybug damaging cotton in Pakistan and India, with a discussion on seasonal morphological variation

Zootaxa ◽  
2008 ◽  
Vol 1913 (1) ◽  
pp. 1-35 ◽  
Author(s):  
CHRIS HODGSON ◽  
GHULAM ABBAS ◽  
MUHAMMAD JALAL ARIF ◽  
SHAFQAT SAEED ◽  
HAIDER KARAR
Keyword(s):  
Adult Female ◽  
Adult Male ◽  
Morphological Variation ◽  
Indian Subcontinent ◽  
Single Species ◽  
Western India ◽  
Similar Species ◽  
Type Specimens ◽  
Phenacoccus Solenopsis ◽  
Morphological Differences

Since at least 2005, a possibly introduced mealybug of the genus Phenacoccus has been causing serious damage to cotton (Gossypium hirsutum) over much of the Sindh and Punjab districts of Pakistan and in north-western India. Some short papers have been published locally giving details on the structure and biology of this species and suggesting the name Phenacoccus gossypiphilous Abbas, Arif & Saeed (2005) but without designating type specimens or depositories. This name is here considered a nomen nudum. A detailed morphological study has been unable to separate this species from many specimens of Phenacoccus from the Neotropics that are believed to be Phenacoccus solenopsis Tinsley. The material from the Indian subcontinent shows considerable morphological variation in the frequency of multilocular disc pores and oral collar tubular ducts on the ventral submargin of the abdomen; this appeared to be related to conditions under which this species was reared, with those cultured in a screen-house during the non-cotton-growing season being indistinguishable from P. solenopsis from the Neotropics . This paper re-describes the adult female of P. solenopsis Tinsley based on the type specimens from New Mexico, and designates a lectotype. The type material was compared with specimens considered to be P. solenopsis from elsewhere in the New World, and from West Africa and several areas in Asia, particularly Pakistan and India. Based of our present understanding of the morphology of adult female P. solenopsis, it is concluded that the species is rather variable, that this variability may be environmentally induced, and that the species currently causing widespread damage to cotton on the Indian subcontinent is referable to P. solenopsis. Adult male P. solenopsis from North America, Pakistan and India were also studied and again no significant differences were found. Descriptions are provided of the adult male and all the immature stages of P. solenopsis, based on material from India and Pakistan. Keys are provided to (a) separate P. solenopsis from similar species of Phenacoccus currently known from Asia and (b) to identify all instars. The morphological differences between P. solenopsis, P. solani Ferris and P. defectus Ferris are reviewed and, based on the morphological variation found in the Asian material, it is considered that there is some support for the suggestion that these three species might be environmentally induced variants of a single species. A few details are given of the biology of P. solenopsis on cotton in Pakistan.

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