Trichapion rostrum

Distinguished from other weevils by the placement of antennae near the base of the rostrum rather than at the apex—a characteristic of the family Brentidae. The all-black coloration and association with Baptisia seed pods provide additional field clues. The elongated rostrum is notably long relative to body size.

Adults are entirely black. The body features an elongated snout (rostrum) with antennae attached near its base rather than at the tip.

Associated with wild indigo (Baptisia) plants in habitats where these legumes occur. Specific habitat types are not documented in available sources.

Distribution details are not specified in available sources. Observations have been recorded in North America where Baptisia species are native.

Larvae feed on seeds within Baptisia seed pods. Adult feeding habits are not documented.

• Baptisia - egg deposition site and larval food sourceFemales deposit eggs in seed pods; larvae feed on developing seeds

Females deposit eggs in seed pods of wild indigo plants. Larvae feed on seeds within the pods. Pupation and adult emergence details are not documented.

Females have been observed depositing eggs specifically in seed pods of host plants. Seed predation by larvae represents the primary documented behavioral interaction.

Seed predator of Baptisia species. Can adversely affect host plant reproduction through seed consumption.

• Other BrentidaeShare the characteristic of antennae attached to the rostrum base rather than the apex, distinguishing them from Curculionidae (true weevils) which have apical antennae

• seed predator
• monophagous
• Brentidae

• BugGuide
• Wikipedia
• iNaturalist taxon