internal fertilization


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internal fertilization

[in′tərn·əl ‚fərd·əl·ə′zā·shən]
(physiology)
Fertilization of the egg within the body of the female.
References in periodicals archive ?
Sperm storage, internal fertilization and embryonic dispersal invent and seep tubeworms (Polychaeta: Siboglinidae: Vestimentifera).
Indeed internal fertilization has been inferred from the presence of seminal receptacles at the posterior end of the oviduct in several vestimentiferan species (Hilario et al.
grasslei have been tentatively classified as introsperm, since pseudocopulation and internal fertilization has been hypothesized for this species (Zal et al.
Sperm storage, internal fertilization, and embryonic dispersal in vent and seep tubeworms (Polychaeta: Siboglinidae: Vestimentifera).
Gardiner and Jones (1985) suggested that direct sperm transfer and internal fertilization might occur in Riftia pachyptila, because this species has modified sperm.
The breeding strategy of internal fertilization followed by zygote release rather than brooding assures a high level of fertilization without sacrificing dispersal potential.
Sperm penetration through ovary wall and evidence of internal fertilization.
Internal fertilization in hermaphroditic colonial invertebrates.
The sexual cycle includes the internal fertilization of the mature eggs soon after the inhalant siphons open (Milkman, 1967); the continuous release of sperm starting 16 h later (Stewart-Savage and Yund, 1997); and the brooding of developing embryos, which are released just before the zooids degenerate at the end of the cycle (Milkman, 1967).
Buckland-Nicks and Scheltema (1995) proposed that internal fertilization, not external, is basal to the Bilateria; evidence for this conclusion came from analysis of similar introsperm design in primitive members of vertebrate and invertebrate phyla.
Rather, there is growing support for viewing limpets as a divergent group (Ponder and Lindberg, 1996) whose ancestors may have had internal fertilization with introsperm, a helicoid larval shell (Page, 1994), and primitive ctenidia.
Spermatozoa of the elasmobranch Squalus suckleyi, a species that has internal fertilization, have a cap-shaped acrosomal vesicle and a subacrosomal rod (Stanley, 1971).