vitellarium

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vitellarium

[‚vid·əl′ar·ē·əm]
(invertebrate zoology)
The part of the ovary in certain rotifers and flatworms that produces nutritive cells filled with yolk. Also known as yolk larva.
References in periodicals archive ?
guptai in egg size, absences of sticky glands in the anterior part, position of testis with respect to ovary, extent of vitellaria and in the arrangement of intestine in hind portion of the worm but shows strong variations as regards total body length, size ratios, clamp size, the shape & size of testis and also prepharynx size.
The possible incorporation of the Aqueous extract of the stem bark of Vitellaria paradoxa in the therapeutic treatment of dermatitis caused by T.
Vitellaria formed by two compact lobes, located at sides of ventral sucker.
Ophionereis schayeri Muller & Troschel, 1844, endemic to Australia, is a lecithotrophic developer (egg diameter 248 [micro]m) with a nonfeeding vitellaria larva (12).
Vitellaria in two lateral groups of follicles numbering 8 on the right and 7 on the left.
Worm-maturity analysis was performed on 583 specimens, based on criteria established by Bell and Smyth (1958) and later used by Rand and Burt (1985) and Camp (1989): Stage A, immature (vitellaria undeveloped, testes and ovary distinct or indistinct, eggs absent); Stage B, mature (granular vitellaria extending anteriorly at least to the posterior testis, eggs absent); Stage C, gravid (vitellaria thick and follicular, egg(s) present).
An echinoderm vitellaria with a bilateral larval skeleton: Evidence for the evolution of ophiurid vitellariae from ophioplutei.
Mature proglottids of the former appeared to contain a single vitellaria, clearly distinguishing it from the latter species, which is characterized by two vitellaria (Loewen, 1940; Brooks and Mayes, 1976).