Ilisoa conjugalis, commonly known as the Buffelsbay tree sheet-web sSpider, is a species of spider in the family Cyatholipidae. It is endemic to the Western Cape province of South Africa.
Distribution Ilisoa conjugalis is known from three localities on the Cape Peninsula: Buffelsbay, Kalkbaai, and Cape Point in Table Mountain National Park. It occurs at approximately 77 metres above sea level.
Habitat The species builds small horizontal sheet webs in vegetation on sand dunes in the Fynbos Biome.
Etymology The species epithet conjugalis is Latin meaning "conjugal" or "of marriage".
Conservation The species has a small, restricted distribution and is listed as Rare. It is protected within Table Mountain National Park, where threats from coastal development have been mitigated.
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