Pamphiliidae

Pamphiliidae can be distinguished from Megalodontesidae by their simple, filiform antennae. Within the family, the three subfamilies are distinguished by phylogenetic analysis of morphological characters. Genera can be separated by combinations of adult morphological features; keys exist for regional faunas including the Nearctic Neurotoma and European Pamphilius vafer complex.

Larvae occur on host plants in forests, plantations, and natural woodlands. Host plants include conifers (pine, spruce, cedar), oaks, and various angiosperms including Rosaceae (Rubus, Rosa, Padus, Crataegus), Viburnum, Cornus, and Astilbe. Larvae construct silk shelters on host foliage.

Temperate regions of North America and Eurasia. Documented in northeastern and north-central United States (Connecticut, Massachusetts, Maine, New Hampshire, New Jersey, New York, Pennsylvania, Vermont, Wisconsin), Canadian provinces (Alberta, Newfoundland, Ontario), and across Europe and Asia including China, Japan, Lebanon, and Italy.

Adult emergence typically occurs in spring and early summer. For Acantholyda erythrocephala, emergence extends from early May to early June. Pamphilius ochreipes emerges in late May and early June. Larval feeding occurs primarily in June.

Larvae feed on plant foliage. Host plants include Pinaceae (Pinus resinosa, P. strobus, Picea, Cedrus libani), Fagaceae (Quercus rubra), Rosaceae (Rubus spp., Rosa multiflora, Padus obtusata, Crataegus spp.), Viburnum opulus (Adoxaceae), Cornus spp. (Cornaceae), and Astilbe spp. (Saxifragaceae).

• Pinus resinosa - larval hostred pine
• Pinus strobus - larval hostwhite pine, preferred host in northern New York outbreaks
• Picea - larval hostspruce species
• Cedrus libani - larval hostcedar of Lebanon
• Quercus rubra - larval hostnorthern red oak
• Rubus inopertus - larval hosthost for Onycholyda xanthogaster
• Rubus hirsutus - larval hosthost for Onycholyda fulvicornis
• Rubus peltatus - larval hosthost for Onycholyda atra
• Rosa multiflora - larval hosthost for Pamphilius palliceps
• Padus obtusata - larval hosthost for Pamphilius padus
• Crataegus - larval hosthost for Neurotoma crataegi
• Viburnum opulus - larval hosthost for Pamphilius ochreipes
• Cornus - larval hosthost for Pamphilius japonicus
• Astilbe - larval hosthost for Pamphilius ishikawai, first Saxifragaceae record for family
• Steinernema sp. - parasiteentomopathogenic nematode found in Acantholyda erythrocephala prepupae
• Homaspis interruptus - parasitoidichneumonid parasitoid of Acantholyda erythrocephala larvae
• Homaspis rufinus - parasitoidichneumonid larval parasitoid of Cephalcia spp.
• Homaspis narrator - parasitoidichneumonid larval parasitoid of Cephalcia spp.
• Sinophorus crassifemur - parasitoidichneumonid larval parasitoid of Cephalcia spp.
• Olesicampe monticola - parasitoidichneumonid larval parasitoid of Cephalcia spp.
• Xenoschesis fulvipes - parasitoidichneumonid larval parasitoid of Cephalcia spp.
• Myxexoristops abietis - parasitoidtachinid larval parasitoid of Cephalcia spp.
• Clonostachys rosea - pathogenentomopathogenic fungus from Cephalcia chuxiongica

Development includes egg, larval, prepupal, and adult stages. Larvae feed on host foliage, often for approximately 6 weeks. Prepupae enter soil to overwinter. Some species exhibit extended diapause: Acantholyda erythrocephala shows 9-66% of prepupae remaining in soil for more than one year; Cephalcia arvensis has annual, biennial, and rare triennial individuals. Longer-cycle individuals tend to be larger and more fecund. Pamphilius ochreipes is univoltine, overwintering as larva in soil.

Larvae use silk to construct protective structures: communal webs or tents (web-spinning sawflies) or individual leaf rolls or tubes (leaf-rolling sawflies). Some species are gregarious with larvae living in large groups. Adults are diurnal. Females of some species oviposit preferentially on distal portions of branches and lower crown sections.

Herbivores that can cause significant defoliation of host trees during outbreaks. Serve as prey for diverse parasitoid complexes including ichneumonid wasps and tachinid flies. Host entomopathogenic nematodes and fungi. Population dynamics include extended diapause as a bet-hedging strategy.

Some species are forest pests during outbreaks. Acantholyda erythrocephala (pine false webworm) caused an unprecedented sustained outbreak affecting 5440 hectares of white pine in northern New York from 1981-1995. Cephalcia species cause outbreaks in European spruce forests. Larval silk production and leaf-rolling behavior make them subjects of ecological and behavioral study.

• MegalodontesidaeClosely related family distinguished by complex, often serrate or pectinate antennae versus the simple filiform antennae of Pamphiliidae

Family name is sometimes incorrectly spelled 'Pamphilidae' (missing the second 'i').

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• OVIPOSITION AND FECUNDITY OF PINE FALSE WEBWORM (HYMENOPTERA: PAMPHILIIDAE)
• BIOLOGY OF PINE FALSE WEBWORM (HYMENOPTERA: PAMPHILIIDAE) DURING AN OUTBREAK
• Untersuchungen über die Fichtengespinstblattwespen Cephalcia spp. Panz. (Hym., Pamphiliidae)
• History of a pine false webworm (Hymenoptera: Pamphiliidae) outbreak in northern New York
• Leaf-rolling sawflies (Hymenoptera, Pamphiliidae, Pamphiliinae) of Tianmushan Mountains, Zhejiang Province, China 
• A new species of Acantholyda (Hymenoptera: Pamphiliidae) from Lebanon, associated with Cedrus libani (Pinaceae)
• Leaf-rolling Sawflies of the Pamphilius vafer complex (Hymenoptera, Pamphiliidae) in Europe
• Pamphilius japonicus feeds on Cornus: the first Old World record of Pamphiliidae (Hymenoptera) associated with Cornaceae
• THE NEARCTIC SAWFLIES OF THE GENUS NEUROTOMA (HYMENOPTERA, PAMPHILIIDAE)
• DNA Barcodes Identify the Larvae and Unassociated Male of Three Onycholyda Sawflies (Hymenoptera, Pamphiliidae) from China
• AN OUTBREAK OF A SAWFLY, PAMPHILIUS PHYLLISAE (HYMENOPTERA: PAMPHILIIDAE), ON NORTHERN RED OAK, WITH NOTES ON LARVAL MORPHOLOGY
• A STUDY OF THE BIOLOGY OF THE WEB-SPINNING SAWFLY PAMPHILIUS OCHREIPES (HYMENOPTERA: PAMPHILIIDAE) IN ONTARIO
• New early Eocene Siricomorpha (Hymenoptera: Symphyta: Pamphiliidae, Siricidae, Cephidae) from the Okanagan Highlands, western North America
• Bionomics of the spruce web‐spinning sawfly Cephalcia arvensis Panzer (Hym., Pamphiliidae) in Northeastern Italy
• Pamphilius ishikawai feeds on Astilbe: the first record of Pamphiliidae (Hymenoptera) associated with Saxifragaceae
• Analysis of Toxic Components in Secondary Metabolites of Entomopathogenic Fungi Clonostachys rosea (Hipocreales: Bionectriaceae) from Cephalcia chuxiongica (Hymenoptera: Pamphiliidae).