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PubMed1978

Ultrastructural observations on the oogenesis of Triops cancriformis (Crustacea, Notostraca).

Each ovarian follicle of Triops cancriformis is four-celled; these cells (one oocyte and three nurse cells) are interconnected by cytoplasmic bridges. In the course of differentiation, the nurse cells are clearly recognizable; they increase in size more than the oocyte and their nuclei contain many nucleoli. For the first time in Arthropoda, yolk globules are reported to be present in nurse cell cytoplasm; these globules arise from the smooth endoplasmic reticulum. The functional significance of the intercellular bridges and the trophic role of the nurse cells are discussed.

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PubMedDate not supplied

[On a new species of sand flea from Ecuador and tungiasis, a problem of Public Health in many developing countries].

The authors recently described a new species of sand flea (genus Tunga) occurred in goat, sheep, cow, pig and man, in the Andean village of S.ta Isabel (Ecuador) and named Tunga trimamillata. Its most important morphological characteristics are: slightly larger dimensions than T. penetrans, both in male and female; presence on the anterior extremity of gravid female of three rounded humps surrounding head and thorax; length of the first segment of maxillary palpi which is longer than each of the other three. The importance of this parasite is due to the fact that it can cause the same damages as T. penetrans both in humans and domestic animals, with conseguent walking difficulties and local or generalized infections. For breeders, economic losses can be remarkable. Tungiasis is a serious problem of Public Health in many countries of Latin America and Subsaharian Africa, and it can be considered in these localities as an indicator of underdevelopment and poor hygiene conditions.

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