Silk-mechanics
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Kukulcania
Crevice Weavers
Kukulcania is a genus of crevice weaver spiders in the family Filistatidae, first described by Pekka T. Lehtinen in 1967 and named after Kukulkan, a Mesoamerican serpent deity. The genus contains fifteen species distributed across the Americas, from the United States through Mexico and Central America to South America. These spiders are characterized by their cribellate silk production and distinctive sexual dimorphism. The most widespread species, Kukulcania hibernalis, is highly synanthropic and has been introduced to multiple regions outside its native range.
Kukulcania hibernalis
Southern House Spider
Kukulcania hibernalis, commonly known as the Southern House Spider, is a large cribellate spider native to coastal eastern Mexico and the eastern United States. The species exhibits extreme sexual dimorphism: mature females are velvety black or dark gray with a tarantula-like body shape and lumpy eye arrangement, while males are pale beige or brown with small bodies and extremely long legs. Females construct sprawling, lacy, non-sticky webs around tubular retreats on buildings, using specialized cribellar silk with extreme extensibility achieved through a hierarchical loops-on-loops structure. The species is synanthropic and has been introduced widely across the Americas, the Caribbean, Liberia, and the Canary Islands.