Lopesia

Lopesia species are distinguished from other Cecidomyiidae genera primarily by gall morphology and host plant association, as adult morphological characters require specialist examination. Species-level identification relies on male genitalia morphology, larval spatula structure, and pupal characteristics. The genus is most readily recognized in the field by the distinctive gall structures induced on host plants, which are often species-specific. For example, L. eichhorniae produces rhizome galls on aquatic macrophytes, while multiple species induce various bivalve-shaped galls on Mimosa species.

Species occupy diverse habitats including tropical and subtropical forests, savannas (Cerrado), thorn scrub (Caatinga), and freshwater aquatic environments with macrophytes. Specific microhabitats are determined by host plant distribution, ranging from terrestrial vegetation to submersed rhizomes in lakes.

Neotropical region, with confirmed records from Brazil (São Paulo, Rio de Janeiro, Bahia, and other states). Distribution is closely tied to host plant ranges.

Oviposition timing varies by species. Lopesia eichhorniae oviposits during the dry period (June to September). Other species show gall lifespan variations of 2-4 months depending on morphotype, suggesting staggered seasonal activity patterns.

• Eichhornia azurea (Pontederiaceae) - rhizome gall inducerFirst record of Lopesia in Pontederiaceae; submersible rhizome habitat
• Mimosa gemmulata (Fabaceae) - leaf gall inducerSuper-host supporting at least four Lopesia species with distinct gall morphotypes (lenticular, brown lanceolate, green lanceolate, globoid bivalve-shaped galls)
• Mimosa tenuiflora (Fabaceae) - pinnula gall inducerGalls in Caatinga environment
• Mimosa hostilis (Fabaceae) - gall inducerHost for multiple Lopesia species
• Dalbergia ecastophyllum (Fabaceae) - leaf gall inducerHost of L. grandis
• Lonchocarpus cultratus (Fabaceae) - leaf gall inducerLopesia sp. induces galls on leaflets
• Andira humilis (Fabaceae) - gall inducerHost for undescribed Lopesia species
• Davilla rugosa (Dilleniaceae) - reproductive structure gall inducerFirst record of Lopesia in Dilleniaceae; host of L. davillae
• Leandra ionopogon (Melastomataceae) - gall inducerHost of L. leandrae

Complete metamorphosis with egg, three larval instars, pupa, and adult. First-instar larvae present during gall induction; second instar during early growth and development; third instar during late growth and development; pupation occurs within the gall at maturation stage; adults emerge from senescent galls. Gall lifespan ranges from 2-4 months depending on species and morphotype.

Larval feeding stimulates host plant cell redifferentiation, division, and elongation, leading to gall formation. Gall induction involves manipulation of plant growth regulators including indole-3-acetic acid. Feeding behavior influences direction of cell elongation, predominantly periclinal, which determines gall bivalve shape. Oviposition timing may be restricted to specific seasonal periods.

Gall inducers that structurally modify host plant tissues, creating protected microhabitats for immature development. Gall formation alters host plant anatomy, including establishment of nutritive tissue that sustains larvae. Galls may influence local plant community dynamics through resource allocation changes in host plants.

• Other Cecidomyiidae gall generaLopesia galls may resemble those of Asphondylia, Clinodiplosis, or other cecidomyiid genera; distinguished by combination of host plant specificity, gall morphology, and internal anatomy including tissue stratification patterns
• Other gall-inducing insect groups (Cynipidae, Psyllidae, etc.)Gall morphology can resemble those induced by wasps or true bugs; distinguished by gall internal structure, presence of larval chamber characteristics, and association with dipteran rather than hymenopteran or hemipteran inducers

• gall midge
• Cecidomyiidae
• gall inducer
• Neotropical
• Brazil
• plant-insect interaction
• host specificity
• super-host

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• New state record of Lopesia grandis Maia, 2001 (Insecta, Diptera, Cecidomyiidae)
• New species of Lopesia (Diptera, Cecidomyiidae) associated with Eichhornia azurea (Pontederiaceae) from Brazil
• New species of Lopesia Rübsaamen (Diptera: Cecidomyiidae) associated with Andira humilis Mart. ex Benth. (Fabaceae)
• Two new species of Lopesia Rübsaamen (Diptera, Cecidomyiidae) associated with Mimosa hostilis (Mimosaceae) in Brazil
• Lopesia davillae (Diptera, Cecidomyiidae), a new species of gall midge from Brazil associated with Davilla rugosa (Dilleniaceae)
• Biology and development of galls induced by Lopesia sp. (Diptera: Cecidomyiidae) on leaves of Mimosa gemmulata (Leguminosae: Caesalpinioideae)
• Structural and histochemical profile of Lopesia sp. Rübsaamen 1908 pinnula galls on Mimosa tenuiflora (Willd.) Poir. in a Caatinga environment
• Parasitoid impairment on the galling Lopesia sp. activity reflects on the cytological and histochemical profiles of the globoid bivalve-shaped gall on Mimosa gemmulata
• Structural and Nutritional Peculiarities Related to Lifespan Differences on Four Lopesia Induced Bivalve-Shaped Galls on the Single Super-Host Mimosa gemmulata
• Lopesia leandrae (Diptera, Cecidomyiidae), a new species of gall midge associated with Leandra ionopogon (Mart.) Cogn. (Melastomataceae), a native plant to Brazil
• Detection and distribution of cell growth regulators and cellulose microfibrils during the development of Lopesia sp. galls on Lonchocarpus cultratus (Fabaceae)
• The ontogenesis of four Lopesia Rübsaamen (Cecidomyiidae) galls on the super-host Mimosa gemmulata Barneby (Fabaceae) reveals peculiar anatomical traits