Gnathorhynchidae is a diverse taxon of predatory eukalyptorhynch flatworms characterized by an armed proboscis. Their present taxonomy is not concordant with what we know of their phylogeny. Further progress in this area is hindered by a lack of information concerning their morphology. As recent studies have shown, a historical reliance on live observations for species descriptions has resulted in a number of errors and omissions. Here, we redescribe the anatomy of the male copulatory organ of using transmission-electron and confocal microscopy, correcting several errors in the original description. Furthermore, we use these results to update our understanding of the anatomy and evolution of male copulatory organs in Gnathorhynchidae and in Platyhelminthes more generally.
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http://dx.doi.org/10.1111/ivb.12125 | DOI Listing |
Physiol Behav
December 2024
Instituto de Investigaciones Cerebrales, Universidad Veracruzana, Avenida Luis Castelazo s/n Col. Industrial Ánimas, Xalapa, Veracruz C. P. 91190. Mexico.
The pubertal phase involves significant brain reorganization, where external stressors and diet can profoundly influence long-term behavioral outcomes. In this study, we investigated the interaction between acute pubertal stress (via immune challenge) and a hypercaloric diet in adulthood on the copulatory sexual behavior of male Wistar rats. At postnatal day (PND) 35, pubertal males received a single injection of lipopolysaccharide (LPS, 1.
View Article and Find Full Text PDFPLoS One
December 2024
Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Tokyo, Japan.
The investment of males in reproductive traits is often associated with their age. For example, several empirical and theoretical studies have demonstrated that older males make greater investment in reproduction compared with younger males. However, with regards to post-copulatory sexual selection, male reproductive success might be influenced by decreasing sperm quality with male age and the interaction between aging and mating experience in males.
View Article and Find Full Text PDFMicrosc Res Tech
December 2024
Laboratory of Entomology, Institute of Zoology of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
Ascariasis, caused by the parasitic roundworm Ascaris lumbricoides, is a major public health issue, especially in developing nations such as Pakistan. It impacts millions, causing significant morbidity through starvation, stunted growth in children, and a variety of gastrointestinal issues. The taxonomy of the Ascaris genus, notably the distinction between A.
View Article and Find Full Text PDFCurr Zool
December 2024
School of Biological Sciences, Level 2, Te Toki a Rata Building, Victoria University of Wellington, Wellington 6012, New Zealand.
The theoretical trade-off between immune and endocrine investment in mating animals has received mixed empirical support, particularly in reptiles. We investigated the relationship between male sexual characteristics, diet, and immune response to stress in an island population of tuatara () across two mating seasons. Tuatara are promiscuous, with a highly skewed mating system where males face significant competition for access to mates and postcopulatory competition for fertilization success.
View Article and Find Full Text PDFInt J Parasitol Parasites Wildl
December 2024
Department of Zoology, Swedish Museum of Natural History, Box 50007, SE-104 05, Stockholm, Sweden.
The study of the polyopisthocotylan parasites of marine fishes in the western Mediterranean is carried on using an integrative approach combining morphology and DNA barcodes. n. gen.
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