Asignación taxonómica de las lagartijas del género Sceloporus (Squamata: Phrynosomatidae) de la colección herpetológica del CIIDIR-IPN-Durango

Se proporciona una lista detallada de los ejemplares del género Sceloporus depositados en la colección herpetológica del CIIDIR-IPN-DGO. Se determinaron 24 especies de los estados de Chihuahua, Coahuila, Durango, Jalisco, Morelos, Nayarit, Nuevo León, Querétaro, Quintana Roo, San Luis Potosí, Veracruz y Zacatecas, de las que S. albiventris, S. clarkii clarkii, S. heterolepis, S. lemosespinali, S. melanorhinus, S. nelsoni barrancarum, representan nuevos registros para Durango, y S. heterolepis se registra por primera vez para Zacatecas. Adicionalmente, se extiende el área de distribución y altitud conocida de algunas especies y se señalan variaciones encontradas respecto a los patrones típicos de escamación y coloración en ejemplares de algunas de las especies y se señalan, en su caso, nuevos registros municipales

Distribución geográfica de Scincella incerta (Squamata: Scincidae) en el estado de Chiapas, México

New records of Sincella incerta in Chiapas State are presented and its presence confirmed in the central region of the State. One of the records from the southeastern coastal foothills fills a gap in the distribution of the species between previous records from Chiapas and Guatemala.Se presentan nuevos registros de Sincella incerta en el estado de Chiapas y se confirma su presencia en la región central del estado. Uno de los registros de las estribaciones costeras del sureste llena un espacio en la distribución de la especie entre registros anteriores de Chiapas y Guatemala

Reproductive traits and change in body shape of neonates in the Oak Forest Skink, Plestiodon lynxe

Reproductive traits are critically important for understanding how organisms adapt to their respective environments. In this study, we provide information on relative litter mass (RLM) and other litter and neonate related characters of nine female Plestiodon lynxe captured in the field. We also recorded seven body dimensions in 16 neonates and 15 two-month juveniles, and on the basis of these dimensions we compared the body shape of these two age classes to detect changes in the proportions of body parts. The average litter size (4.55) is larger than that found in other viviparous species of Plestiodon, but smaller than those of congeneric oviparous species of similar size. However, the average body size of newborns (25.49 mm) is similar to that of other oviparous and viviparous species of Plestiodon. The average RLM was relatively high (0.36). The relative size of the head and limbs becomes proportionally smaller, whereas the axilla-groin length becomes proportionally larger in the first 2 months of life. We suggest that these changes are related to changes in locomotion and microhabitat use

New records and morphological variation of rhadinaea marcellae taylor, 1949 (squamata, colubridae) from sierra madre oriental, México

Rhadinaea marcellae Taylor, 1949 is known from only 12 specimens. Based on recent fieldwork and research in scientific collections and databases, we report 14 new records of R. marcellae, bringing the total number of verified occurrences up to 26, updating our understanding of this secretive species’ distribution in the tropical and cloud forests of the Sierra Madre Oriental in Mexico. The new records come from the Mexican states of Hidalgo, Puebla, San Luis Potosí and Veracruz. All the newly reported specimens are morphologically concordant with R. marcellae, but exhibit noteworthy variation.Funding for fieldwork was provided by the Dirección General de Apoyo al Personal Académico, Universidad Nacional Autónoma de México (PAPIIT-IN 221016 and IN 216619) and the Fundación Pedro y Elena Hernández, A. C

New occurrence records of Eleutherodactylus syristes in Guerrero and Oaxaca, Mexico

AbstractThe Sierra Madre del Sur (SMS) of southern Mexico is known for its exceptionally high levels of amphibian endemism, but knowledge of species’ ranges in the region is incomplete. Here, we report new locality records for Eleutherodactylus syristes (Hoyt, 1965) from the states of Oaxaca and Guerrero. Previously, this species was known only from the Pacific slopes of the Sierra de Miahuatlán and Mixteca Alta in Oaxaca. These new occurrence records extend the known range of this species by approximately 335km from the type locality and increase the elevational range, indicating it is more widespread in the SMS. Eleutherodactylus syristes is currently listed as endangered by the IUCN based on its limited distribution and ongoing threats to its persistence

Second-Generation Bioethanol Production through a Simultaneous Saccharification-Fermentation Process Using Kluyveromyces Marxianus Thermotolerant Yeast

Due to the present renewable fuels demand increase, reduction of second-generation bioethanol production cost is pursued, since it is considered the most promising biofuel, but not yet economically viable. A proposed solution is its production through a simultaneous saccharification and fermentation process (SSF); however, it is necessary to apply temperatures above 40°C, which reduce the viability of traditional ethanologenic yeasts. As consequence, the use of thermotolerant ethanologenic yeast has been suggested, among which the yeast Kluyveromyces marxianus stands out. This chapter addresses the production of second-generation bioethanol through the SSF process, emphasizing the potential of K. marxianus to transform lignocellulosic biomass as agave bagasse. As result, it is proposed to direct the second-generation bioethanol production to the SSF process employing thermotolerant yeasts, to increase process productivity, and addressing the economic barriers

A partial molecular phylogeny of Rhadinaea and related genera (Squamata, Dipsadidae) with comments on the generic assignment of Rhadinaea eduardoi

The genus Rhadinaea is a diverse clade of New World dipsadid snakes, with 22 species arranged in six recognized species groups. The most recently described species, Rhadinaea eduardoi, was described based on a unique specimen collected in the Santa Catarina Juquila municipality in the Sierra Madre del Sur of southern Oaxaca, Mexico. Here, based on a reexamination of the holotype and the results of a phylogenetic analysis of the holotype of Rhadinaea eduardoi and representatives of several genera closely related to Rhadinaea, we reassessed the generic assignment of Rhadinaea eduardoi. In our phylogenetic hypothesis, R. eduardoi was nested within a strongly supported clade of Coniophanes fissidens samples, thus making Rhadinaea paraphyletic with respect to Coniophanes. Additionally, our reexamination of the holotype of Rhadinaea eduardoi revealed that the alleged presence of a subpreocular scale is only true on the right side of the head, and that this scale appears to be a malformed preocular scale; also, a reduction in dorsal scale rows is present; and posterior enlarged maxillary teeth are grooved. Herein we consider that Rhadinaea eduardoi should be placed in the synonymy of Coniophanes fissidens. Consequently, we recognized only five species groups within the genus Rhadinaea

FIGURE 3 in A new species of Plestiodon (Squamata: Scincidae) from Sierra Madre del Sur of Guerrero, México

FIGURE 3. Geographic distribution of the members of the Plestiodon brevirostris group in Guerrero, México. Discontinuous lines represent state limits. The stars denote the localities of P. nietoi sp. nov. The solid squares represent localities of P. brevirostris, open squares and open circles represent the closest localities of P. indubitus and P. ochoterenae, respectively

Geographical distribution and potential geographical range of the Red Skink Scincella assata (Cope, 1864) (Squamata, Scincidae) in El Salvador

Scincella assata (Cope, 1864) is known from eight departments from El Salvador. Based on recent fieldwork and research in scientific collections and databases, we report 12 new records of S. assata from the country, bringing the total number of verified occurrences to 40. Scincella assata is recorded for first time in the departments of Morazan and Usulatán. Additionally, we conducted potential distribution modeling of S. assata. Results from the distribution modeling suggest the presence of this species in all 14 departments of El Salvador, four of which currently lack verified records