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 (vīt′l-âr′ē-əm, vĭt′-)
n. pl. vi·tel·lar·i·ums or vi·tel·lar·i·a (-ē-ə)
A group of glands in flatworms and certain other invertebrates that secrete yolk.

[New Latin, from Latin vitellus, egg yolk; see vitellus.]
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The ovarioles were of the telotrophic meroistic type, wherein nurse cells in the distal germarium provide nutrients to developing follicles contained in the vitellarium (Chapman 1998).
Uterus extending anteriorly on left side; uterine sac median, without lateral sacculations in posterior half of body, well separated from acetabulum, receiving uterus near middle; vitellarium undeveloped; no eggs (Fig.
Dissection of the females during this period confirmed that the ovariole was immature and the vitellarium had no developed oocytes or that the development of the latter was only incipient.
Diet C: Once the vitellarium sac had been absorbed, rotifers, Brachionus plicatilis, were given at a rate of 10/mL for 10 days; thereafter, 2 cladocerans D.
To study the chick embryo, Fabrici, 1942b, 141-48, begins with basically seven structures, though the uterus signified three of them: the uterus, the egg, the vitellarium (group of yolks) or raceme (ovary, group of eggs), the pediolus (stalk to which yolks are attached), the peduncle (attaching yolk to the stalk), the infundibilum (the passage between the first and second uterus), and the podex (where the second uterus terminates).
Generally only the terminal follicle within an ovariole is vitellogenic, there being a distinct demarcation between the previtellarium and the vitellarium of the ovariole.