| immature ixodes scapularis (acari: ixodidae) parasitizing lizards from the southeastern u.s.a. | preserved museum specimens of 13 lizard and 3 snake species common in the southeastern u.s.a. were examined for immature ixodes scapularis say ticks. five eumeces and 4 ophisaurus lizard species yielded an infestation prevalence of 17.8% for species of eumeces and 29.0% for species of ophisaurus. mean intensity of larvae and nymphs was 7.1 and 2.7, respectively, for species of eumeces, and 6.3 and 1.4, respectively, for species of ophisaurus. collection dates of the lizards ranged from january t ... | 1993 | 8410539 |
| development of the extraembryonic membranes and histology of the placentae in virginia striatula (squamata: serpentes). | development of the extraembryonic membranes and their structural alignment in the formation of the four placental categories that occur in virginia striatula is similar to that of other serpentes. the vascularized trilaminar omphalopleure contacts the uterine epithelium early in development to form the choriovitelline placenta, which subsequently extends over the surface of the yolk to its limit at the margin of the isolated yolk mass. as in other squamates, the isolated yolk mass is separated f ... | 1990 | 29865735 |
| responses to snake odors by laboratory mice. | male and female laboratory mice (mus musculus ; harlan sprague dawley) were tested for reactions to snake odors. in the first experiment, mice were presented with untreated paper on the floor of one side of a test tank and snake-scented or control (water misted) paper on the other side. the scented papers were obtained from rough earth snakes (virginia striatula ), which were fed earthworms, and a rat snake (elaphe obsoleta ), which ate mice. male mice exhibited no differences in response to the ... | 1987 | 24897256 |
| ultrastructure of the placentae of the natricine snake, virginia striatula (reptilia: squamata). | virginia striatula is a viviparous snake with a complex pattern of embryonic nutrition. nutrients for embryonic development are provided by large, yolked eggs, supplemented by placental transfer. placentation in this species is surprisingly elaborate for a predominantly lecithotrophic squamate reptile. the embryonic-maternal interface consists of three structurally distinct areas, an omphalallantoic placenta and a regionally diversified chorioallantoic placenta. the chorioallantoic placenta over ... | 2003 | 12474265 |
| embryonic mobilization of calcium in a viviparous reptile: evidence for a novel pattern of placental calcium secretion. | yolk reserves supply the majority of embryonic nutrition in squamate reptiles, including calcium. embryos of oviparous squamates exploit the eggshell for supplemental calcium, while embryos of viviparous species may receive additional calcium via the placenta. developmental uptake of calcium in oviparous snakes increases during the interval of greatest embryonic growth (stage 35 to parturition). however, the pattern of embryonic calcium acquisition is unknown for viviparous snakes. furthermore, ... | 2010 | 20100588 |
| expression of calcium transport proteins in the extraembryonic membranes of a viviparous snake, virginia striatula. | yolk is the primary source of calcium for embryonic growth and development for most squamates, irrespective of mode of parity. the calcified eggshell is a secondary source for embryonic calcium in all oviparous eggs, but this structure is lost in viviparous lineages. virginia striatula is a viviparous snake in which embryos obtain calcium from both yolk and placental transport of uterine calcium secretions. the developmental pattern of embryonic calcium acquisition in v. striatula is similar to ... | 2012 | 22821861 |