Syssphinx heiligbrodti
Harvey, 1877
Heiligbrodt's Mesquite Moth
Syssphinx heiligbrodti is a medium-sized saturniid commonly known as Heiligbrodt's Mesquite Moth. It occurs across the southwestern United States and northern Mexico, where it is associated with mesquite and acacia plants. The is closely related to S. hubbardi (Hubbard's Silkmoth), with which it shares similar and appearance. are and attracted to lights, with activity primarily during summer months.
Pronunciation
How to pronounce Syssphinx heiligbrodti: //sɪsˈsfɪŋks ˌhaɪlɪkˈbrɒdti//
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Distribution
Central Texas west through southern New Mexico and Arizona to southern California; extends south through Mexico to Veracruz. Records indicate presence in Middle America and North America.
Seasonality
on the wing June through September, with peak activity in July and August. Texas may exhibit extended or multiple with adults recorded into November.
Diet
Larvae feed on Catclaw Acacia (Senegalia greggii, formerly Acacia greggii), Honey Mesquite (Prosopis glandulosa), and Little-leaf Palo Verde (Cercidium microphyllum). Captive rearing indicates larvae will accept Honey Locust (Gleditsia triacanthos), Black Locust (Robinia pseudoacacia), and Jerusalem Thorn (Parkinsonia ) as alternate .
Life Cycle
hatch into larvae that feed nocturnally on foliage. Young larvae position individually on leaf petiole undersides, feeding on leaf bases; older larvae cut petioles and bend leaves downward to access additional foliage. Larval development to ranges from under three weeks to considerably longer, even within single egg batches. Mature larvae reach approximately 55 mm in length. Pupation occurs underground in shallow , with emerging the following season. Adults emerge in early evening and seek mates between 11 PM and 2 AM. Typically one annually; partial second generation possible in southern portions of range.
Behavior
are and strongly attracted to artificial lights, including in urban settings. Larvae are strictly nocturnal feeders, requiring flashlight observation. Young larvae exhibit solitary positioning on leaf petioles; older larvae display leaf-cutting and manipulation behavior to create feeding platforms. Adults exhibit rapid hindwing exposure revealing bright pink coloration when startled.
Ecological Role
Larval herbivore on woody leguminous shrubs and trees in arid and semi-arid . Role in as prey for birds, bats, and other ; pupal stage subject to and by soil-dwelling organisms.
Human Relevance
Subject of interest among enthusiasts and silk moth rearers; contributes to knowledge of saturniid through captive rearing records. occasionally encountered at residential lights in urban areas within its range. No significant economic impact documented.
Similar Taxa
- Syssphinx hubbardiNearly identical larval and coloration; distinguished by subtle differences in wing pattern and coloration. S. hubbardi has more extensively pink hindwings and slightly different forewing markings. Geographic ranges overlap broadly in Arizona and New Mexico. Both utilize similar plants including Prosopis glandulosa and Senegalia greggii. Larvae cannot be reliably separated by field observation or photography.
- Syssphinx montanaLarvae nearly identical to S. heiligbrodti and S. hubbardi, requiring rearing to or genetic analysis for definitive identification. Occurs in more northerly and montane portions of the range.