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Psilotum is a genus of fern-like vascular plants.It is one of two genera in the family Psilotaceae commonly known as whisk ferns, the other being Tmesipteris.Plants in these two genera were once thought to be descended from the earliest surviving vascular plants, but more recent phylogenies place them as basal ferns, as a sister group to Ophioglossales.
Eye - conjunctival sac. Life cycle Eggs escape from eye and mouth or nostrils of final host, hatch immediately after contact with water; cercariae develop in fresh-water immediately after contact with fresh-water prosobranch snail in 95 days after infection, encyst on surfaces shortly after emergence; metacercariae ingested by final host, make ...
Tmesipteris, the hanging fork ferns, is a genus of ferns, one of two genera in the family Psilotaceae, order Psilotales (the other being Psilotum). Tmesipteris is restricted to certain lands in the Southern Pacific, notably Australia, New Zealand and New Caledonia.
Psilotum nudum, the whisk fern, [3] is a fernlike plant. Like the other species in the order Psilotales, it lacks roots. [4]Its name, Psilotum nudum, means "bare naked" in Latin, because it lacks (or seems to lack) most of the organs of typical vascular plants, as a result of evolutionary reduction.
Pteridophyte life cycle Just as with bryophytes and spermatophytes (seed plants), the life cycle of pteridophytes involves alternation of generations . This means that a diploid generation (the sporophyte, which produces spores) is followed by a haploid generation (the gametophyte or prothallus , which produces gametes ).
Thelaziasis is the term for infestation with parasitic nematodes of the genus Thelazia.The adults of all Thelazia species discovered so far inhabit the eyes and associated tissues (such as eyelids, tear ducts, etc.) of various mammal and bird hosts, including humans. [2]
Human can become infested, but is extremely rare and thought to be accidental. There are only few reports of Thelazia californiensis infestation in humans. [8] Thelazia callipaeda. Thelazia callipaeda eye worm is a nematode transmitted by drosophilid flies not only primarily to carnivores and lagomorphs but also to humans. Only a few cases have ...
The life cycle of P. cynomolgi resembles that of other Plasmodium species, particularly the related human parasite Plasmodium vivax. [10] Like other Plasmodium species, P. cynomolgi infects both an insect host and a vertebrate (generally Old World monkeys). The parasite is transmitted when the mosquito host takes a blood meal from the ...