WebThe striking similarity between this sperm and that of some 'primitive' annelids, as well as an overall similarity with filiform sperm of some other invertebrate groups including basal flatworms, indicates homology and an ancient link between these groups that includes internal fertilization. This idea is WebAug 24, 2024 · The morphological characteristics of different sperm cells (normal, abnormal, and immature) in the peregrine falcon during the reproductive season were analysed. We also classified the main sperm defects found in semen. Semen samples were collected from mature peregrine falcons via cloacal massage and stained with Diff-Quik stain. The …
Gnathostomulida (Unsegmented Marine Worms) - Sterrer
WebFeb 15, 2013 · There are two orders, Filospermoidea (with a pointed anterior devoid of compound sensory bristles; without a bursa copulatrix; and filiform sperm, with one flagellum) and Bursovaginoidea (with a rounded anterior with compound sensory bristles; with a bursa; and rounded or cone-shaped sperm, aflagellate). WebThe filiform sperm of Littorina sitkana swims effectively in sea water and more viscous fluids, overcoming the problems of a non-uniform flagellar beat with an unusual … bsw bone and joint institute
filiform - definition of filiform - synonyms, pronunciation, spelling ...
Webfluences determine length of the filiform sperm nucleus in bryophytes and many vascular arche-goniates, and whether they taper at one end (Carothers, 1973, 1975), at both ends (Suire, 1970; Myles, 1975), or are blunt at both ends with a middle constriction (Moser, 1970) or without a middle constriction (Robert, 1974). WebFiliform apparatus is present inside the ovary of the flower. It is a thickened and prominent structure. Synergids show a filiform apparatus attached to their upper wall. It attracts … WebMaintaining sperm viability for long periods within the spermatheca is crucial for insect reproductive success; however, the details of this process remain poorly understood. This review examines several aspects of and gaps in the current understanding of spermatheca biology, including morphology, function, reservoir filling, development, and ... executive branch in texas