WebMother myliobatoids secrete a protein-rich histotroph ('uterine milk') to provide fetal nourishment before birth; in some forms, gestatory parts of the uterus form thousands of long nutritive threads (trophonemata) that enter the developing rays through the spiracles, thus delivering their nourishing secretions directly into the pharyx. WebFeb 15, 2013 · The epithelium of trophonemata is cubic, with signs of synthesis and secretion activity evidenced by the acidophil cytoplasm. Vascularity is reduced but the …

Uterine changes of Myliobatis goodei during reproductive

WebPhysical Characteristics. The reef manta has the classic manta ray body shape featuring a broad head with an enormous wide mouth flanked by two broad, flexible, fleshy lobes … WebThe epithelium of trophonemata is simple and pseudo-stratified with little development and no secretion activity. The corium is reticular, characterized by the presence of undifferentiated cells,... short term car insurance australia

"The Biannual Cycle and Reproductive Morphology of the

WebSep 15, 2016 · The lipid secretions in the white shark were highly active and resembled those from the trophonemata of pregnant manta rays (Soma et al., 2013). It is likely that the white shark embryos in the stage examined in this study consume not only uterine milk but also nutrient eggs. Embryos have functional teeth and 50-70 encased nutrient eggs, and ... WebTrophonemata may be conspicuous, as in Par-parasiticus, or poorly developed, as in Protopalythoa sp. 1. Live eggs vary from −300 µm (most zoanthids) to ∼500 µm diameter in Palythoa spp.; in the two mass spawning species from the Great Barrier Reef they are shed as compact ovoid egg (or egg/sperm) bundles. Webhistotrophy. Structures called trophonemata work as pla-cental analogues responsible for the production of the uterine milk that feeds the embryos (Wourms et al., 1988). The right ovary is described as rudimentary and non-functional, because of its smaller size and lack of ova production (Wourms, 1977; Thorson et al., 1983). In con- short term car insurance monthly