Depressariidae

Meyrick, 1883

Flat-bodied moths

Genus Guides

Carcina(oak long-horned flat-body moths)
Depressariinae
Ethmiinae
Eupragia
Machimia
Oditinae
Peleopodinae
Psilocorsis
Stenomatinae(Stenomatine moths)

Depressariidae is a of comprising approximately 2,300 worldwide. Formerly treated as a of Gelechiidae, it is now recognized as a distinct family within the superfamily Gelechioidea. The family includes ten subfamilies: Acriinae, Aeolanthinae, Cryptolechiinae, Depressariinae, Ethmiinae, Hypercalliinae, Hypertrophinae, Oditinae, Peleopodinae, and Stenomatinae. Several , including Carcina, Gonionota, Machimia, Himmacia, and Psilocorsis, remain unplaced within the subfamily structure. Members of this family exhibit diverse larval feeding habits, with many species specialized on particular plant families.

Psilocorsis quercicella by (c) Mark Richman, some rights reserved (CC BY), uploaded by Mark Richman. Used under a CC-BY license.

Antaeotricha haesitans by (c) Sam Kieschnick, some rights reserved (CC BY), uploaded by Sam Kieschnick. Used under a CC-BY license.

Antaeotricha osseella by (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist. Used under a CC-BY license.

Pronunciation

How to pronounce Depressariidae: //dɛˌprɛsəˈri.aɪdi.ai//

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

Identification

Members of Depressariidae can be distinguished from superficially similar tortricid leafrolling by their upturned labial palps, which project forward between the and resemble small horns. The Ethmia, a representative member, exhibits characteristic black, white, and gray coloration with relatively large size for microlepidoptera (10–15 mm). Many require dissection of genitalia for definitive identification due to subtle external morphological differences.

Images

Habitat

vary considerably across the . The Ethmia is abundant in oak woodlands. The Antaeotricha floridella occupies dry sandhills and scrub habitats in peninsular Florida. Timocratica albella develops within the branches and trunk of camu camu trees in Peruvian Amazon plantations. Agonopterix guanchella has been collected from multiple locations on Gran Canaria in the Canary Islands.

Distribution

Worldwide distribution with approximately 2,300 . The Ethmia is particularly diverse in the southwestern United States, with over 50 species north of Mexico. The includes Eurasian species introduced to North America, such as Depressaria depressana. Some species exhibit restricted distributions: Antaeotricha floridella is to peninsular Florida sandhills, and Agonopterix guanchella is known only from Gran Canaria. Distribution records from GBIF include Denmark, Norway, and Sweden.

Diet

Larval feeding habits are diverse and often specialized. The Ethmia feeds predominantly on plants in the Boraginaceae, Ehretiaceae, and Hydrophyllaceae; Ethmia discostrigella has been observed feeding on Mountain Mahogany. Depressaria depressana is a family-level on Apiaceae, feeding on more than a dozen across multiple tribes including Daucus carota, Pastinaca sativa, and Heracleum maximum. Depressaria radiella feeds almost exclusively on Pastinaca and Heracleum. Timocratica albella larvae bore into and consume the outer bark (rhytidome) of camu camu (Myrciaria dubia).

Host Associations

Myrciaria dubia - larval camu camu; branches and trunk bored by Timocratica albella larvae
Daucus carota - larval wild carrot; Depressaria depressana
Pastinaca sativa - larval wild parsnip; Depressaria radiella and D. depressana
Heracleum maximum - larval native cow parsnip; Depressaria radiella in eastern North America
Heracleum sphondylium - larval hogweed; Depressaria radiella in Eurasia
Zizia aurea - larval native North American apiaceous ; Depressaria depressana can survive on fruits
Cercocarpus montanus - larval Mountain Mahogany; Ethmia discostrigella
Quercus geminata - larval sand live oak; Antaeotricha floridella
Drymonia - larval Gesneriaceae ; Ethmia lesliesaulae and E. normgershenzi in Rica

Life Cycle

Complete with , larval, pupal, and stages. Timocratica albella exhibits: egg stage lasting 11.5 days; larval stage with nine instars lasting 164.8 days; pupal stage lasting 25.6 days; and adult stage lasting 5.7 days, for a total of approximately 208 days at 28°C and 58–60% relative humidity. Larvae of many construct silken tubes or webs for concealment. Acrolophus species, historically placed in Depressariidae, are known as "grass tube moths" due to larval construction of silken tubes at grass bases or roots.

Behavior

are attracted to blacklights and ultraviolet light sources. Larvae of Timocratica albella are particularly voracious in their final instar, consuming 21–78 cm² of outer bark throughout development. Larvae of many are cryptic and feed concealed within plant tissues, between leaf layers, or within constructed silken tubes. Some larvae exhibit mining in conifer needles or broadleaved plants.

Ecological Role

Larvae function as herbivores, with many exhibiting high specificity. Some species serve as significant pests: Timocratica albella causes severe economic damage to camu camu in Peru, with damage reaching 91–95% in some plots. Depressaria radiella and D. depressana have been studied for their capacity to detoxify furanocoumarin defensive compounds in their Apiaceae hosts, with D. radiella showing greater metabolic capacity than D. depressana.

Human Relevance

Some have economic importance as pests of cultivated plants. Timocratica albella is a serious pest of camu camu, an economically important fruit crop in the Peruvian Amazon. The serves as a subject of taxonomic research, with new species regularly described; recent examples include Antaeotricha floridella from Florida and Agonopterix guanchella from the Canary Islands. Two Rican species, Ethmia lesliesaulae and Ethmia normgershenzi, were named to honor conservationists Leslie Saul-Gershenz and Norm Gershenz.

Similar Taxa

GelechiidaeDepressariidae was formerly treated as a of Gelechiidae; distinguished by upturned labial palps in many Depressariidae
TortricidaeSuperficially similar leafrolling ; Depressariidae distinguished by upturned palps projecting like horns between
ColeophoridaeThe Ethmia was formerly placed in Coleophoridae before transfer to Depressariidae based on revised phylogenetic understanding
TineidaeThe Acrolophus was formerly placed in Tineidae; now in separate Acrolophidae but historically associated with Depressariidae

More Details

Taxonomic History

The 's classification has undergone significant revision. Formerly treated as Depressariinae within Gelechiidae, molecular and morphological evidence supported elevation to family rank. The Ethmia was transferred from Coleophoridae to Depressariidae. The genus Acrolophus was removed to family Acrolophidae. These changes reflect ongoing refinement of gelechioid .

Furanocoumarin Metabolism

in the Depressaria exhibit varying capacity for detoxification of furanocoumarin defensive compounds in their Apiaceae . Depressaria radiella from Heracleum maximum metabolize angular more rapidly than those from Pastinaca sativa, suggesting host-associated . Depressaria depressana, a more recent invader to North America, metabolizes these compounds at lower rates than D. radiella.

Phylogenetic Research

A 2024 phylogenetic analysis of the Semioscopis (ZooKeys 1265) contributed to understanding relationships within Depressariidae, including description of a new from China. has been employed in species delimitation, though in some cases such as Agonopterix guanchella, no closely related species were detected.