Torymus solitarius
(Osten-Sacken, 1870)
Torymus solitarius is a small parasitic wasp in the Torymidae, known to attack gall-forming insects. The has been documented as a of hackberry nymphs (Pachypsylla spp.) within their galls on hackberry trees. It is one of several Torymus species associated with psyllid galls in North America. emerge from galls by chewing exit holes after completing larval development on the nymph.
Pronunciation
How to pronounce Torymus solitarius: //ˈtɔrɪməs soʊˈlɪtəriəs//
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Identification
As a member of Torymidae, this likely exhibits the -diagnostic features: a laterally compressed metasoma giving a somewhat 'humpbacked' appearance, long with 10-13 flagellomeres, and an elongated ovipositor in females. However, specific distinguishing characters from congeneric species such as T. californicus or other Torymus attacking psyllids are not documented in the provided sources. Identification to species level requires examination of morphological details not described here.
Habitat
Associated with hackberry (Celtis spp.) trees bearing nipple galls induced by Pachypsylla psyllids. The develops within the enclosed gall environment created by the insect, not in open .
Distribution
Canada: recorded from Alberta, British Columbia, and Ontario.
Diet
Larval stage feeds as a on nymphs of hackberry psyllids (Pachypsylla spp., Psyllidae). diet not documented.
Host Associations
- Pachypsylla celtidismama - Larval of nymphs within nipple galls on hackberry
Life Cycle
Larval develop as internal on nymphs inside hackberry leaf galls. Upon completing development, chew through the gall wall to emerge. The number of per year and stage are not documented.
Ecological Role
Acts as a agent, regulating of hackberry psyllids. As a , it contributes to the natural enemy complex associated with gall-forming insects on hackberry.
Human Relevance
Indirectly beneficial to humans by reducing of hackberry psyllids, which can become nuisance pests when seek shelter in buildings. No direct negative impacts documented.
Similar Taxa
- Psyllaephagus spp. (family Encyrtidae)Also parasitizes hackberry nymphs within galls; distinguished by belonging to a different with different morphological features (Encyrtidae typically have reduced wing venation and different antennal structure)
- Torymus californicusCongeneric associated with oak apple galls rather than hackberry; differs in association and geographic distribution
More Details
Gall parasitoid guild
Multiple may attack nymphs within a single gall, including Torymus solitarius, Psyllaephagus spp., and potentially others. The relative abundance and success rates of these competing parasitoids in hackberry galls have not been quantified.