Onygenales

Onygenales

Onygena equina, a representative species of the order Onygenales

The Onygenales is an order of fungi within the class Eurotiomycetes, which is part of the division Ascomycota. This order is notable for including fungi that are pathogenic to humans and animals, as well as species that are keratinophilic, meaning they can degrade keratin, a protein found in skin, hair, and nails.

Characteristics

Members of the Onygenales are characterized by their ability to decompose keratinous materials. This ability is due to the production of keratinase enzymes. The order includes both saprophytic species, which feed on dead organic matter, and pathogenic species, which can cause diseases in humans and animals.

The fungi in this order typically produce ascomata, which are fruiting bodies that contain the asci and ascospores. The ascomata can vary in form, from simple structures to more complex ones.

Pathogenic Species

Several species within the Onygenales are known to cause dermatophytosis, commonly known as ringworm, in humans and animals. These fungi infect the skin, hair, and nails, leading to various dermatological conditions.

Genera

The order Onygenales includes several genera, some of which are:

• Arthroderma
• Coccidioides
• Histoplasma
• Onygena

Onygena equina, depicted in the image, is a species that grows on the hooves and horns of dead animals, utilizing the keratin in these structures.

Ecology

Onygenales fungi are found in a variety of environments, often associated with animal remains or habitats where keratinous materials are present. They play a crucial role in the decomposition of keratin, contributing to nutrient cycling in ecosystems.

Related Pages

• Ascomycota
• Eurotiomycetes
• Dermatophytosis
• Fungal pathogens