Species Details

Synaxis pallulata

University of Alberta E.H. Strickland Entomological Museum Read more about this collection »

Common NameSeptember Thorn SeasonalityAdults fly from August to October in BC (Jones 1951); no Alberta data available. IdentificationThe September Thorn, like several other large geometrids that fly in the fall, is bright rust-brown or yellowish. The discal spots are small and black but distinct; wings with a pointed protrusion at mid-margin. Similar to the extremely variable Prochoerodes trnasversata, but the PM line joins the wing margin in a straight line, whereas it angles sharply toward the thorax near the apex in transversata. Synaxis jubararia is very similar, but pallulata has heavier crosslines with more dark mottling. No structural differences between jubararia and pallulata are known.

Scientific Name Synaxis pallulata Common Name September Thorn Habitat Montane coniferous forest. Seasonality Adults fly from August to October in BC (Jones 1951); no Alberta data available. Identification
The September Thorn, like several other large geometrids that fly in the fall, is bright rust-brown or yellowish. The discal spots are small and black but distinct; wings with a pointed protrusion at…
The September Thorn, like several other large geometrids that fly in the fall, is bright rust-brown or yellowish. The discal spots are small and black but distinct; wings with a pointed protrusion at mid-margin. Similar to the extremely variable Prochoerodes trnasversata, but the PM line joins the wing margin in a straight line, whereas it angles sharply toward the thorax near the apex in transversata. Synaxis jubararia is very similar, but pallulata has heavier crosslines with more dark mottling. No structural differences between jubararia and pallulata are known.
Life History
The mature larva is marbled brown and dark grey, with a faint herringbone pattern dorsally; there are two other larval colour morphs, one cream-green the other brown. Pupation is in the upper soil layers, and the egg…
The mature larva is marbled brown and dark grey, with a faint herringbone pattern dorsally; there are two other larval colour morphs, one cream-green the other brown. Pupation is in the upper soil layers, and the egg presumably overwinters (Duncan 2003).
Conservation Not of concern. Diet Info Larvae feed primarily on Douglas-fir (Pseudotsuga) and hemlock (Tsuga), and occasionally on spruce (Picea), fir (Abies), and lodgepole pine (Pinus contorta) (Prentice 1963). Range BC and western Alberta south to Oregon (McGuffin 1987).

Citation

Page Citation for Synaxis pallulata

Page Citation

"Species Details - Synaxis pallulata, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-4307. Accessed 29 Jun. 2022.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Geometroidea Family Geometridae Subfamily Ennominae Tribe Ourapterygini Genus Synaxis Species Synaxis pallulata
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum