Erythraeoidea
Robineau-Desvoidy, 1828
Long-legged Velvet Mites
Family Guides
2Erythraeoidea is a superfamily of mites commonly known as long-legged velvet mites, characterized by extremely elongated legs relative to body size. Members exhibit a complex involving distinct morphological and behavioral phases: post-larval stages (deutonymph and ) are active , while the six-legged larval stage is parasitic on and vertebrate . This superfamily belongs to the infraorder Anystina within the order Trombidiformes. The group has a fossil record extending to at least the Cretaceous period, with specimens preserved in amber documenting ancient host- relationships.
Pronunciation
How to pronounce Erythraeoidea: /ɛˌrɪθriˈɔɪdiə/
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Identification
Distinguished from other velvet mite superfamilies by extremely long, slender legs. and deutonymphs are relatively large among mites, with soft, often brightly colored bodies. Larvae are six-legged and heteromorphic, differing substantially in body form from post-larval stages. The combination of elongated legs and complex with parasitic larvae separates Erythraeoidea from related groups such as Trombidioidea.
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Habitat
Occupies diverse terrestrial environments. Some inhabit tree in forest , as documented by collection via canopy fogging in preserved mountain slope forests. Specific microhabitat preferences vary among included .
Distribution
Worldwide distribution. Documented from the Brazilian Atlantic Forest in South America, and from Cretaceous amber deposits in Myanmar (ca. 100 Mya). The superfamily is broadly distributed across multiple continents based on iNaturalist observation records.
Diet
Post-larval stages (deutonymph and ) are predatory. Larvae are parasitic and do not feed independently.
Host Associations
- Diptera - most common fossil record
- Lepidoptera - documented in amber
- Araneae - spider documented in amber
- Psocodea - booklouse documented in amber
- Hemiptera - includes cicadas and planthoppers (Fulgoromorpha) as documented
- Vertebrata - larvae parasitize vertebrate
Life Cycle
Complex with heteromorphic development. The six-legged larva is parasitic and attaches firmly to or vertebrate . Following the larval stage, a quiescent calyptostatic occurs. The active deutonymph and stages are free-living with eight legs. This developmental pattern is characteristic of the larger group Parasitengona.
Behavior
Larvae exhibit strong attachment , enabling frequent preservation in amber still attached to hosts. Post-larval stages are active, . Some occupy arboreal , occurring in tree .
Ecological Role
Larvae function as in , linking and vertebrate to higher . Post-larval stages serve as . The group contributes to understanding historical food web structure through fossil evidence.
Similar Taxa
- Trombidioideaalso velvet mites, but distinguished by less extreme leg elongation and different larval preferences
- Tanaupodoidearelated superfamilies within Parasitengona lacking the characteristic long-legged of Erythraeoidea
More Details
Fossil Significance
Erythraeoidea provides exceptional examples of 'frozen behaviour' in amber, with larvae preserved while attached to . The oldest confirmed record is from ca. 100 Mya Kachin amber, documenting of an planthopper. This represents the only known fossil record of erythraeoidean parasitism of Hemiptera: Fulgoromorpha.
Taxonomic Composition
The superfamily includes such as Smarididae, with members being moderately large, worldwide distributed . Some families within Erythraeoidea remain poorly documented from South America, with few described despite apparent diversity.