F. O. Pickard-Cambridge’s 1896 publication is an account of new species collected on the steamship Faraday’s journey up the Amazon. One of those described was Harmonicon rufescens, the type species for a new genus. H. rufescens is a member of the Dipluridae family, infraorder Mygalomorphae. Harmonicon spp. are distributed widely across northeast South America. H. rufescens is a terrestrial rainforest species, with a locality along the shores of the lower Amazon. It webs heavily, covering up to a square meter of forest floor. Web is said to be supported by vertical silk strands surrounding a central tunnel entrance to which the spider rapidly retreats when disturbed. In captivity, H. rufescens webs nearly every surface available, limited seemingly by the size of enclosure offered. It constructs a stout web tunnel from which prey are taken voraciously. Growth is rapid, reaching reaching 3-4″ in adulthood.
Accounts of Harmonicon spp. in situ typically show moist forest floor habitat. We keep H. rufescens without special accommodation and find it hardy at room temperature and with no particular humidity requirement. It may benefit from weekly misting.
Venom potency is unknown, caution is advised.
The first photo above shows a 2″ young male. The second photo shows a 1+” spiderling/juvenile.