Saucrobotys

Munroe, 1976

Species Guides

Saucrobotys fumoferalis(dusky saucrobotys moth)
Saucrobotys futilalis(dogbane saucrobotys moth)

Saucrobotys is a of in the Crambidae, established by Munroe in 1976. The genus contains at least two described : Saucrobotys fumoferalis and Saucrobotys futilalis. Larvae of at least one species, S. futilalis (the dogbane webworm), are known to feed on dogbane (Apocynum spp.), sequestering the plant's toxic cardenolides for their own chemical defense.

Saucrobotys futilalis by (c) David George, some rights reserved (CC BY), uploaded by David George. Used under a CC-BY license.

Saucrobotys futilalis by (c) Marissa Calvert, some rights reserved (CC BY), uploaded by Marissa Calvert. Used under a CC-BY license.

- 4936 – Saucrobotys futilalis – Dogbane Saucrobotys by Wildreturn. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Saucrobotys: /saʊ.kroʊˈboʊtɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Saucrobotys are small to medium-sized crambid moths. Larvae of S. futilalis construct conspicuous silk tents on dogbane plants, with older caterpillars displaying aposematic orange and black coloration. The can be distinguished from related pyraustine crambids by genitalic characters and wing pattern features described in Munroe's original .

Images

Habitat

Associated with dogbane (Apocynum spp.) growing in meadows, roadsides, and forest edges. The plant occurs in open, sunny .

Distribution

Records from Vermont and other parts of the United States. Distribution appears to align with that of dogbane in North America.

Seasonality

active during summer months. Larval activity observed in midsummer.

Diet

Larvae of Saucrobotys futilalis feed on dogbane (Apocynum cannabinum and A. androsaemifolium), sequestering the plant's cardenolide toxins.

Host Associations

Apocynum cannabinum - larval common dogbane
Apocynum androsaemifolium - larval spreading dogbane

Life Cycle

Larvae construct silk tents on plants. Caterpillars undergo ontogenetic color change from cryptic green when young to aposematic orange with black spots as they mature. occurs within the silk webbing.

Behavior

Larvae are gregarious tent-makers. When disturbed, caterpillars regurgitate gut contents containing sequestered cardenolides as a chemical defense against .

Ecological Role

Herbivore that has evolved to exploit the chemical defenses of its plant, converting toxic cardenolides into a deterrent. The conspicuous larval coloration serves as a warning signal to potential predators.

Human Relevance

No significant direct interactions with humans. Occasionally noticed by naturalists and gardeners due to conspicuous larval tents on dogbane plants.

Similar Taxa

PyraustaRelated pyraustine crambid ; Saucrobotys distinguished by genitalic and specific wing pattern elements
HerpetogrammaAnother crambid with web-making larvae; differs in plant associations and larval coloration patterns

More Details

Chemical sequestration

Research by Dr. Jacqualine Grant demonstrated that S. futilalis caterpillars actively sequester cardenolides from dogbane and use these compounds for defense against , with aposematic coloration advertising this unpalatability.

Taxonomic history

The was erected by Eugene G. Munroe in 1976 to accommodate previously placed in other pyraustine genera, based on distinctive morphological characters.