Panchaetothripinae

Bagnall, 1912

Panchaetothripinae is a of within , first described by Bagnall in 1912. It comprises approximately 144 across 43 globally, though earlier estimates cited 11 genera and more than 50 species. Members are predominantly associated with leaves and include several economically significant . The subfamily has been consistently recovered as in phylogenetic analyses. Notable genera include Heliothrips, Caliothrips, Selenothrips, and Hercinothrips, with species distributed across tropical and subtropical regions worldwide.

Hercinothrips femoralis by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Caliothrips by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Pronunciation

How to pronounce Panchaetothripinae: //ˌpæn.kəˌɛ.toʊˈθraɪ.pɪnaɪ//

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Identification

of Panchaetothripinae can be distinguished from other by morphological characters used in illustrated to and , including features of the , , and body setation. Second can be identified using patterns, with illustrated keys available for 17 of 25 species recorded in Brazil and Argentina. Specific diagnostic characters vary by genus; for example, Phibalothrips species are distinguished by features visible in identification keys to the genus.

Images

Habitat

Usually associated with leaves. In New Zealand, primarily associated with ferns, particularly Blechnaceae and Polypodiaceae . Phibalothrips occur mainly on grasses. Caliothrips species feed on a range of plants including grasses. In the Philippines, species infest plants, fruit trees, grasses, and ornamentals.

Distribution

Global distribution across tropical and subtropical regions. Recorded from Brazil, Argentina, Japan, the Philippines, India (Puducherry), Saudi Arabia, New Zealand, Australia, Tahiti, and northern Italy (first European field record for Selenothrips rubrocinctus). In Japan, 16 in 11 were previously recorded, with three additional species newly documented. In Brazil, 21 species from 12 genera were previously recorded, with four species newly documented. In New Zealand, four species occur, including one (Sigmothrips aotearoana) and three species.

Diet

Feeding habits vary by . Phibalothrips feed on grasses. Caliothrips species feed on a range of different plants including grasses. Several species are pests of cultivated plants.

Host Associations

Blechnaceae (ferns) - breeding New Zealand Sigmothrips aotearoana
Polypodiaceae (ferns) - breeding New Zealand Sigmothrips aotearoana
grasses - Phibalothrips; also Caliothrips
mangosteen - pest Caliothrips striatopterus, Heliothrips haemorrhoidalis, Selenothrips rubrocinctus in Philippines
cacao - pest Selenothrips rubrocinctus
cashew - pest Selenothrips rubrocinctus
mango - pest Selenothrips rubrocinctus
avocado - pest Selenothrips rubrocinctus
guava - pest Selenothrips rubrocinctus
Liquidambar styraciflua - Selenothrips rubrocinctus in Italy
Carpinus betulus - Selenothrips rubrocinctus in Italy
Piper myristicum - Copidothrips octarticulatus on Pohnpei island
Aglaonema - Copidothrips octarticulatus, damage to leaves
Spathoglottis - Copidothrips octarticulatus, damage to leaves
castor (Ricinus communis) - pest Zaniothrips ricini
navel oranges - Caliothrips fasciatus overwinters in navels, transported internationally

Life Cycle

Development includes , larval (first and second ), propupal, pupal, and stages. For Caliothrips fasciatus, egg-to-adult development rate varies with temperature; degree day accumulation to complete development ranges 370.37–384.61. , optimal, and maximum temperature thresholds for development are approximately −4.37–6.52°C, 31.19–32.52°C, and 35.07–37.98°C respectively. Second instar have been described for multiple and can be identified using patterns. Males have been described for several species where previously unknown, including Phibalothrips rugosus and Copidothrips octarticulatus.

Behavior

Caliothrips fasciatus overwinter inside the navels of navel oranges, facilitating accidental transport during international fruit trade. This has been documented for over 120 years but has not led to established outside the range (California and western Mexico), possibly due to cold temperatures (2.78°C) during transit causing high adult mortality.

Ecological Role

Several are significant agricultural pests causing direct damage to leaves and fruits. Selenothrips rubrocinctus causes damage known as 'ferrugem da banana' (banana rust/silvering) and 'rouille argentée des bananes'. In the Philippines, Caliothrips striatopterus, Heliothrips haemorrhoidalis, and Selenothrips rubrocinctus are pests of mangosteen and other high-value . The New Zealand species Sigmothrips aotearoana breeds only on plants, while species in New Zealand breed on both and plants.

Human Relevance

Several are economically important agricultural pests. Caliothrips fasciatus is a regular in navel oranges exported from California to Australia, New Zealand, and elsewhere, triggering concerns and surveys for establishment. Heliothrips haemorrhoidalis (greenhouse ) is a widespread pest of ornamentals and , though its presence in Saudi Arabia remains doubtful despite extensive surveys. Species identification is important for pest management and biosecurity, with molecular techniques recommended for confirming identity of some Helionothrips species.

Similar Taxa

ThripinaeAnother within ; distinguished by morphological characters used in subfamily-level , including antennal structure and patterns
DendrothripinaeAnother within ; Panchaetothripinae consistently recovered as distinct from other Thripidae subfamilies in phylogenetic analyses

More Details

Taxonomic stability

The number of recognized and has expanded considerably from earlier estimates (11 genera, >50 species) to approximately 43 genera and 144 species based on more recent comprehensive treatments. Parthenothrips kobusi was reclassified as Bolacothrips kobusi and is not a member of Panchaetothripinae.

Molecular identification

Molecular studies have been conducted to resolve relationships and identifications within the . Barcode sequences have been obtained for specimens from newly colonized regions (e.g., Italian Selenothrips rubrocinctus). identity confirmation using molecular techniques is recommended for some Helionothrips species.

Biogeographic patterns

associations show geographic variation: New Zealand are primarily fern-associated, while tropical and subtropical species show broader host ranges including many plants. The is predominantly tropical and subtropical in distribution, with some species expanding into temperate regions through human-mediated transport.