Declana floccosa, the forest semilooper, is a moth of the family Geometridae. It is endemic to New Zealand. It was first described by Francis Walker in 1863 using specimens obtained from Colonel Bolton.
The larvae feed on a wide range of native and exotic broad-leaved and coniferous shrubs and trees. Exotic hosts include Pinus radiata and other Pinus species, Pseudotsuga menziesii, Larix and Eucalyptus. Native hosts include Muehlenbeckia australis.
- "Declana floccosa Walker, 1858". www.nzor.org.nz. Landcare Research New Zealand. Retrieved 7 February 2017.
- Walker, Francis (1858). "Noctuidae". List of the specimens of lepidopterous insects in the collection of the British Museum. 15: 1521–1888 – via Biodiversity Heritage Library.
- "Declana floccosa, forest semilooper". www.nzffa.org.nz. New Zealand Farm Forestry Association. Retrieved 7 February 2017.
- Hudson, George Vernon (1888). "On the varieties of a common moth (Declana floccosa)". Transactions and Proceedings of the New Zealand Institute. 21: 190–193 – via Biodiversity Heritage Library.
- Patrick, Brian (18 May 2016). "Ecological importance of Muehlenbeckia australis/Pohuehue". www.openspace.org.nz. Retrieved 2017-02-07.
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- Citizen science observations of D. floccosa.
- Specimens held at the Auckland Museum.
- Image of Declana floccosa Walker, 1858; holotype of Declana callista Salmon, 1946 held at Te Papa Tongarewa Museum of New Zealand.
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