stomodaeum

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stomodaeum

[‚stō·mə′dē·əm]
(embryology)
The anterior part of the embryonic alimentary tract formed as an invagination of the ectoderm.
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References in periodicals archive ?
Although the larva has a stomodeum, the gut is blind and the larva is packed with yolk granules (Fig.
Our conclusion, based on the location of the chaetal sac, the folding of the archenteron, and the relative locations of the stomodeum, anus, and chaetal sac in the earliest swimming larval stage, is that the blastopore becomes the opening immediately adjacent to the chaetal sac in the larva and thus forms the anus.
5C, inset), and the majority of DAB staining is restricted to the stomodeum cells and the cells that lie posterior to this structure (Fig.
Table 1 Comparison of developmental characteristics between conspecific and heterospecific fertilizations ofAstropecten scoparius (AS) and Astropecten latespinosus (A1) As x Al Characteristics As type type 1 2 Bipinnarian + + + arms Stomodeum + + + Complete + + - gut Ciliary + + + bands Max length 1061 678 646 ([mu]m) [+ or -] [+ or -] [+ or -] 13.
The polychaete stomodeum and the interrelationships of the families of the Polychaeta.
Concurrently the neurotroch becomes evident as a midventral mass of punctate fluorescence, with the densest reactivity just posterior to the stomodeum.
A ciliated stomodeum formed on the ventral side of the unciliated ectodermal trunk directly below the apical cap (Figs.
As the stomodeum forms, a ventral arc of muscle becomes apparent in the lower lip.
Larvae sectioned at this stage had a digestive tract with an incomplete lumen; the esophagus was open to the exterior via the stomodeum, but its connection to the stomach was blocked by what appeared to be an esophageal plug (Fig.
At the onset of cephalopodial rotation at 52 hours, the foot rudiment is merely a low swelling immediately beneath the stomodeum, although a small, thin operculum is present.