Comprehensive Description

Description of Vittaforma

The type species is V. corneae (Shadduck, Meccoli, Davis and Font, 1990) Silveira and Canning, 1994 in corneal stroma of Homo sapiens (Primates, Hominidae). Monomorphic, diplokaryotic throughout life cycle with all stages including spores surrounded by a complete cisterna of host cell endoplasmic reticulum (e.r). Meiosis unknown. Transmission unknown. Merogony: binary fission of diplokaryotic stages, the encasing e.r. cisterna dividing with the meront. Sporogony: ribbon-shaped sporonts with up to eight diplokarya divide into linear arrays of sporoblasts. The division is effected by means of membranous paramural bodies into which the host endoplasmic reticulum penetrates to facilitate the enclosure of the sporoblasts by host endoplasmic reticulum. Spores: 3.7 x 1.0 µm are elongate cylindrical and diplokaryotic, each still surrounded by host e.r. Polar sac not well described. Polar tube is isofilar with about 6 coils. Exospore is about half as thick as endospore. Polaroplast is composed of tightly packed lamellae around the straight part of the polar tube and a few posterior lamellae in groups of 4.
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Source: BioPedia


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