Tivyna
Chamberlin, 1948
Species Guides
1- Tivyna moaba(mesh web weaver)
Tivyna is a of cribellate araneomorph spiders in the Dictynidae, established by R. V. Chamberlin in 1948. The genus contains four , all but one restricted to the United States. One species, T. spatula, has a broader Caribbean distribution including Mexico, Cuba, and the Bahamas. These spiders are characterized by the presence of a cribellum, a silk-producing organ used to create woolly, non-sticky capture silk.
Pronunciation
How to pronounce Tivyna: /ˈtɪvɪnə/
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Identification
Members of Tivyna possess a cribellum, a flat plate to the bearing thousands of silk-producing spigots. This distinguishes them from ecribellate spiders within Dictynidae and other . The can be distinguished from other cribellate dictynids by genitalic characteristics, though specific diagnostic features require examination. -level identification relies on detailed examination of male and female .
Distribution
The occurs in North America and the Caribbean. Three (T. moaba, T. pallida, T. petrunkevitchi) are known only from the United States. Tivyna spatula has the broadest range, recorded from the United States, Mexico, Cuba, and the Bahamas.
Similar Taxa
- Other Dictynidae generaTivyna shares the characteristics of building irregular, tangled webs. It is distinguished from ecribellate dictynids by the presence of a cribellum, and from other cribellate by genitalic .
- Other cribellate spidersThe cribellum is shared with several other spider (e.g., Filistatidae, Uloboridae). Tivyna is distinguished by its placement within Dictynidae based on arrangement, cheliceral , and other somatic characters.
More Details
Type species
Tivyna pallida (Keyserling, 1887) is the type of the , originally described under the genus Lathys.
Taxonomic history
The was established by Chamberlin in 1948 to accommodate previously placed in other genera. The four currently recognized species were all described prior to the establishment of Tivyna itself.
Observation status
As of the source data, iNaturalist records zero observations for this , suggesting it is either rarely encountered, understudied, or difficult to identify from photographs.