Results 21 to 30 of about 5,244 (196)
The First Gynandromorph of Stonefly From China (Plecoptera: Leuctridae). [PDF]
Ecol EvolThe distribution of Paraleuctra cercia (Okamoto, 1922) in China is confirmed. A gynandromorph of P. cercia is discovered as the first report of a stonefly species for the country. ABSTRACT The distribution of Paraleuctra cercia (Okamoto, 1922) in China is confirmed based on a recent collection from Heilongjiang Province, northeastern China.
Yang X, Huo QB, Du YZ.
europepmc +2 more sources
Animals, 2021 Oviducal glands (OGs) are distinct expanded regions of the anterior portion of the oviduct, commonly found in chondrichthyans, which play a key role in the production of the egg in-vestments and in the female sperm storage (FSS).
Martina Francesca Marongiu +8 more
doaj +1 more source
MORPHOLOGY, REPRODUCTION, SEASONAL ACTIVITY AND HABITAT USE OF A NORTHERN POPULATION OF THE SMOOTH GREENSNAKE (OPHEODRYS VERNALIS) [PDF]
, 2020 The Smooth Greensnake (Opheodrys vernalis) is a small, slender, oviparous, colubrid snake that is widely distributed in North America. Nonetheless, there have been few studies on this species, and little is known about Canadian populations. The objective
Cairns, Nicholas A. +1 more
core +2 more sources
Ecology and Evolution, 2021 Maternal stress during gestation has the potential to affect offspring development via changes in maternal physiology, such as increases in circulating levels of glucocorticoid hormones that are typical after exposure to a stressor.
Kirsty J. MacLeod +2 more
doaj +1 more source
Common lizards break Dollo’s law of irreversibility: genome-wide phylogenomics support a single origin of viviparity and re-evolution of oviparity [PDF]
, 2018 Dollo’s law of irreversibility states that once a complex trait has been lost in evolution, it cannot be regained. It is thought that complex epistatic interactions and developmental constraints impede the re-emergence of such a trait.
Elmer, Kathryn R. +2 more
core +1 more source
Effects of maternal basking and food quantity during gestation provide evidence for the selective advantage of matrotrophy in a viviparous lizard. [PDF]
PLoS ONE, 2012 The evolution of matrotrophy (i.e., direct supply of nutrients by the mother during gestation) may be associated with high maternal energy availability during gestation. However, we lack knowledge about the selective advantages of matrotrophic viviparity
Keisuke Itonaga +2 more
doaj +1 more source
Phylogenetic relationships of African Caecilians (Amphibia: Gymnophiona): insights from mitochondrial rRNA gene sequences [PDF]
, 2003 Africa (excluding the Seychelles) has a diverse caecilian fauna, including the endemic family Scolecomorphidae and six endemic genera of the more cosmopolitan Caeciliidae.
Duellman W.E. +14 more
core +1 more source
Frontiers in Ecology and Evolution, 2020 Multiple paternity is a common phenomenon within the live-bearing fish family Poeciliidae. There is a great variety in brood sizes of at least two orders-of-magnitude across the family.
Myrthe L. Dekker +4 more
doaj +1 more source