Stem Sawfly
( Cephidae )


2009-0516-49064901-HYM00259-Cephidae[1258h41s,F,A,plant-flower]{EXD}-G.jpg

PHOTO COMMENT

IDENTIFICATION
Identification:Cephidae
(Newman, 1834)
Common Name:Stem Sawfly
Life Stage:(A) adult

PHYLOGENY

Phylum:Arthropoda
Class:Insecta
Superorder:Holometabola
Order:Hymenoptera
Suborder:Symphyta
Family:Cephidae
Taxon Code:HYM00259
ITIS/TSN:152855

LOCATION DETAILS
Location Name
BSA Camp Royaneh, BSA Camp Royaneh, 4600 Scanlon Rd., Cazadero
County:Sonoma County
ECI Site#:CA49064901

RECOGNITION
Description
Adult - Body: Slender, laterally compressed. Pronotum: Elongated. Antennae: Clubbed. They wasps are exceptionally slender for symphytans, often resembling other types of wasps, and they are the only Symphyta which lack cenchri. Larva: White. Legs: Without abdominal prolegs, and possessing only vestigial, unsegmented thoracic legs without tarsal claws. Abdomen terminates in a tubular prong or horn.
Similar Taxa
Of the 12 North American species, only 5 have been found in California: Caenocephus aldrichi (Bradle), Hartigia cressonii (Kirby), Janus rufiventris (Cresson), Cephus cinctus (Norton) and Cephus clavatus (Norton).

BIOLOGY
Food
The larvae are stem borers in various plants, especially grasses, but sometimes other herbaceous plants, shrubs, or trees. A few are pests and attacks wheat. Larvae in the tribe Cephini are internal borers in stems of Grammineae, while those in the tribe Hartigiini bore in the twigs of Rosaceae or other arborescent plant families.
Habitat
On grasses (including grain crops) and shrubs (including berries, roses, willows).
Importance
A number of species are of considerable economic importance, for instance the Wheat Stem Sawfly (Cephus cinctus).
Distribution
Across North America.
Importance
A number of species are of considerable economic importance, for instance the Wheat Stem Sawfly (Cephus cinctus).
Development
Univoltine. Pupation occurs in cocoons within the host plant.

CREDITS
Photographer
Eddie Dunbar
Insect Sciences Museum of California

References
Family Cephidae - Stem Sawflies. (bugguide.net/node/view/116011). Accessed March 3, 2017. .
ITIS.
A Revision of the Nearctic Cephidae (Hymenoptera: Tenthredinoidea). Donald T. Ries. Transactions of the American Entomological Society (1890-) Vol. 63, No. 3 (Sep., 1937), pp. 259-324.


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