Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Cladius difformis - Bristly Rose Slug

Sawfly larva - Cladius difformis Sawfly larvae on rose bush in December - Cladius difformis - male Cute little Sawfly larva - Cladius difformis Sawfly with antler antennae on elm - Cladius difformis - male Bristly Rose Slug - Cladius difformis Cladius difformis - male sawfly - Cladius difformis sawfly - Cladius difformis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Tenthredinidae (Common Sawflies)
Subfamily Nematinae
Tribe Cladiini
Genus Cladius
Species difformis (Bristly Rose Slug)
Synonyms and other taxonomic changes
often considered as synonymous to Cladius pectinicornis (Geoffroy 1785)(1), but Dr. D.R. Smith maintains that the two are distinct species, with C. pectinicornis being strictly Palaearctic
Explanation of Names
Cladius difformis (Panzer 1799)
5-7 mm(2)

"Few sawflies have hairs such as this. Rather long hairs on body, prolegs on abdominal segments 2-7 and 10, and feeding on rose pretty well narrows this down to the bristly roseslug." --Dr. Smith's comments
Native to the Palaearctic; probably introduced in North America(2)
Larvae feed on rose leaves, raspberry and strawberry; skeletonizing at first and eating all the leaf tissues but the veins when they get bigger.
Life Cycle
They go through multiple generations a year, if the weather stays warm.
may damage raspberry and strawberry(2)
Internet References
Fact sheet (Rosetta 2009)(3)