Pachycoris

Distinguished from other scutellerid genera by the combination of large bright dorsal spots and association with Euphorbiaceae host plants. The subfamily Pachycorinae placement separates it from Scutellerinae and other subfamilies. Species-level identification requires examination of genitalia and spot pattern details.

Adults possess a shield-shaped body typical of Scutelleridae, with the scutellum covering most of the abdomen and wings. The dorsal surface often displays large, contrasting bright spots. Nymphs are gregarious in early instars.

Found in areas supporting Euphorbiaceae host plants, including Atlantic Forest regions in Brazil and other Neotropical vegetation zones.

Americas; species occur from the southern United States through Central and South America.

Phytophagous; feeds on plants in the family Euphorbiaceae, including genera Cnidoscolus, Croton, and Jatropha. Pachycoris torridus has been documented as a significant pest of Jatropha curcas.

• Cnidoscolus pubescens - host plantEuphorbiaceae; documented for P. torridus in Atlantic Forest, Brazil
• Croton - host plantEuphorbiaceae; genus-level association
• Jatropha curcas - host plantEuphorbiaceae; P. torridus is a major pest
• Telenomus pachycoris - parasitoidScelionidae wasp parasitizes eggs of P. torridus
• Trichogrammatidae - egg parasitoidUnidentified species parasitizing P. torridus eggs
• Spalangia sp. - nymph parasitoidPteromalidae wasp parasitizing P. torridus nymphs

Eggs are laid in masses. Nymphs pass through multiple instars, with early instars typically gregarious. Maternal care has been observed in several species, with females guarding eggs and first-instar nymphs.

Females exhibit maternal care, remaining with egg masses and guarding first-instar nymphs. Early-instar nymphs are gregarious. Color polymorphism exists within species, with multiple phenotypes documented.

Herbivore on Euphorbiaceae; serves as host for egg and nymph parasitoids including scelionid and pteromalid wasps.

Pachycoris torridus is an economically significant pest of Jatropha curcas, a plant cultivated for biodiesel production. Cuticular chemistry studies have been conducted for potential behavioral control methods.

• Other Scutelleridae generaPachycorinae subfamily placement and bright spotted coloration pattern distinguish from Scutellerinae and other subfamilies; Euphorbiaceae host specificity further separates from generalist feeders

• maternal care
• gregarious nymphs
• Euphorbiaceae specialist
• jewel bug
• color polymorphism
• agricultural pest

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• DESCRIPTION, BIOLOGY, AND MATERNAL CARE OF PACHYCORIS KLUGII (HETEROPTERA: SCUTELLERIDAE)
• Biology ofTelenomus pachycoris(Hymenoptera: Scelionidae), a Parasitoid of Eggs ofPachycoris torridus(Hemiptera: Scutelleridae): The Effects of Egg Age, Exposure Time, and Temperature
• Distribution of constitutive heterochromatin in Pachycoris torridus (Hemiptera, Scutelleridae) with different chromatic patterns
• The shield-backed bug, Pachycoris stallii: Description of immature stages, effect of maternal care on nymphs, and notes on life history
• Defensive Chemistry of an Aposematic Bug, Pachycoris stallii Uhler and Volatile Compounds of Its Host Plant Croton californicus Muell.-Arg.
• The shield-backed bug, Pachycoris stallii: Description of immature stages, effect of maternal care on nymphs, and notes on life history
• Ecology and behavior of Pachycoris torridus (Hemiptera: Scutelleridae): new host plant, color polymorphism, maternal care and parasitism
• CHEMICAL PROFILE OF ORGANIC COMPOUNDS PRESENTED IN THE CUTTLE OF MALES AND FEMALES OF THE SPECIES Pachycoris torridus (SCOPOLI, 1772) (Hemiptera: Scutelleridae) SUBMITTED OR NOT ANESTHETIC PROCEDURE AND IN DIFFERENT TIMES