Diclidophlebia

Crawford, 1920

Species Guides

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Diclidophlebia is a pantropical of psyllids (jumping plant-lice) established by Crawford in 1920. The genus contains approximately 25 described distributed across the Americas, Africa, Asia, and Australia. Multiple species are documented crop and forestry pests, with known associations to in Melastomataceae, Sterculiaceae, Irvingiaceae, and other plant . Some species have been investigated as potential agents for plants.

Pronunciation

How to pronounce Diclidophlebia: /dɪˌklaɪdoʊˈflɛbiə/

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Identification

and last instar nymphs can be identified using keys provided in taxonomic revisions; African have been specifically diagnosed and illustrated. The is distinguished from the closely related Paurocephala by morphological characters detailed in systematic treatments. Formal identification to species level requires examination of adult and nymphal against published keys.

Habitat

Associated with plants in tropical and subtropical forests, plantations, and urban green spaces. Specific microhabitat preferences vary by : D. eastopi and D. harrisoni occur on Triplochiton scleroxylon in Nigerian forest plantations; D. smithi occupies Miconia calvescens in the Pacific; D. irvingiae occurs on Irvingia gabonensis in Cameroon. Shade significantly affects habitat suitability for some species, with deep shade reducing rates.

Distribution

Pantropical distribution encompassing the Americas, Africa, Asia, and Australia. Documented occurrences include: Nigeria (D. eastopi, D. harrisoni), Cameroon (D. irvingiae), Brazil/Paraná (undetermined Diclidophlebia sp.), Philippines (D. durio or related on durian), and Pacific regions (D. smithi). One fossil species, †D. subita, is known from the Eocene.

Seasonality

vary by and locality. D. eastopi in Nigeria shows peaks in late January/early February, mid-August, and early/mid-September, with minima in mid/late March. D. harrisoni in Nigeria peaks in February, late July/early August, and late October/early November. D. irvingiae in Cameroon exhibits five correlated with plant . Brazilian of Diclidophlebia sp. on Miconia sellowiana were active year-round with all life stages present monthly, indicating continuous breeding.

Diet

Phloem-feeding; nymphs and extract plant sap from tissues. Feeding site specificity varies: D. eastopi nymphs feed near leaf of mature leaves while adults feed on leaves of any age; D. harrisoni nymphs and adults feed exclusively on young leaves, with first-instar nymphs feeding near leaf margins causing tunnel formation.

Host Associations

  • Triplochiton scleroxylon - primary Sterculiaceae; of D. eastopi and D. harrisoni in Nigeria
  • Irvingia gabonensis - primary Irvingiaceae; of D. irvingiae in Cameroon
  • Miconia sellowiana - primary Melastomataceae; of undetermined Diclidophlebia sp. in Brazil
  • Miconia calvescens - primary Melastomataceae; of D. smithi in Pacific region
  • Durio species - primary Malvaceae; reported by D. durio or related in Philippines
  • Sterculiaceae (general) - -level associationFive African associated with this
  • Tiliaceae - -level associationOne African
  • Chrysobalanaceae - -level associationOne African
  • Euphorbiaceae - -level associationOne African

Life Cycle

Multivoltine with continuous breeding possible year-round in tropical conditions. D. eastopi completes -to-egg cycle in 18.5 days under laboratory conditions; D. harrisoni in 16 days. D. irvingiae has five in Cameroon. D. eastopi produces eggs in batches along leaf ; D. harrisoni lays eggs singly, partially embedded in . Both have five nymphal instars.

Behavior

activity is reduced in deep shade, which decreases rates. D. harrisoni first-instar nymphs feed near young leaf margins, inducing tunnel formation in which they complete development. Multiple matings improve in D. harrisoni. correlate with plant , particularly leaf flush timing.

Ecological Role

Herbivore and pest of woody plants; can cause leaf deformation, , , premature leaf fall, and gall formation on plants. Acts as a significant pest in forestry plantations of Triplochiton scleroxylon and threatens fruit production of Irvingia gabonensis. Investigated as agent for Miconia calvescens.

Human Relevance

Negative: Multiple are economically significant pests. D. eastopi and D. harrisoni damage Triplochiton scleroxylon timber plantations in Nigeria. D. irvingiae threatens Irvingia gabonensis, a tree with medicinal and nutritional importance in Africa. A species on durian (possibly D. durio) affects fruit production in the Philippines. Positive: D. smithi evaluated as agent for Miconia calvescens in Pacific islands. Silvicultural control through shading recommended for nursery protection.

Similar Taxa

  • PaurocephalaClosely related in Liviinae; distinguished by morphological characters detailed in taxonomic revisions; both genera contain crop pest
  • Other Liviinae generaRequire morphological examination and use of published keys for separation; associations may provide additional diagnostic clues

More Details

Nomenclatural history

Diclidophlebia is a replacement name for the preoccupied Heteroneura. Synonyms include Haplaphalara and Sinuonemopsylla. The has been subject to multiple taxonomic treatments, with a major revision of Afrotropical published in 2005.

Population dynamics and climate

Studies show variable responses to climatic factors. Low temperatures favor and production in Brazilian but do not affect stages. Temperature has slight effect on D. eastopi populations in Nigeria; saturation deficit affects D. harrisoni through plant response. Rainy periods may reduce collections but do not necessarily limit population development.

Sex ratios and fecundity

D. eastopi exhibits 1:1 sex ratio in field with mean of 502 and daily oviposition of 38 eggs. D. harrisoni shows female:male ratio of 2:3 with mean fecundity of 131 eggs and daily oviposition of 31 eggs.

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