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Articles by Rosemary I. Egonmwan
Total Records ( 2 ) for Rosemary I. Egonmwan
  Rosemary I. Egonmwan
  The ecology of Tympanotonus fuscatus var. radula (L.) in the mangrove swamps of the Lagos lagoon is described. The salinity in the habitat was found to vary between 0.1‰ during the rains and 25‰ in March during the dry season when the habitat dries up. The fluctuating pH, low level of dissolved oxygen content, recorded in the study area could be an indication of the deteriorating water quality. The substratum consists of black mud which sometimes contains hydrogen sulphide. The species is amphibious. It is active in the rainy season and in dry season it congregates under objects or burrow into the soil in the habitat. The species is found only at the edges of the lagoon and not in the main body.
  Rosemary I. Egonmwan
  The seminal vesicle region of the hermaphrodite duct of the edible land snail, Limicolaria flammea (Müller) is described using light and electron microscopy. The lumen is lined with a single layer of epithelial cells surrounded by connective tissues and circularly arranged smooth muscle. Transmission electron microscopy reveals that there are two types of epithelial cells lining the lumen of the seminal vesicle duct. Type 1 epithelial cells are highly ciliated columnar with large irregular shaped basal nuclei. Type 2 epithelial cells are non-ciliated columnar with large irregularly shaped basal nuclei. The apical surface of the Type 2 cell bears numerous microvilli. Mitochondria, glycogen, lipids, rough and smooth endoplasmic reticulum, lysosomes, Golgi bodies and vacuoles are observed in the two types of epithelial cells and their lateral margins are joined apically by zonula adhaerens, below which are located septate junctions. The functional significance of the epithelial cells are discussed.
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