Metapelma

Westwood, 1835

Species Guides

2

Metapelma is a of parasitic and the sole genus in the Metapelmatidae. Members are of wood-boring larvae, particularly in families Cerambycidae and Buprestidae. The genus is globally distributed with approximately 40 described . At roughly 6 mm in body length, Metapelma species are notably large compared to other chalcidoid wasps and may be encountered directly in the field rather than solely through rearing.

Metapelma by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.Metapelma spectabile ♀ (48594637727) by Christina Butler from Georgia, United States. Used under a CC BY 2.0 license.Chalcidoid Wasp (28728056910) by Katja Schulz from Washington, D. C., USA. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Metapelma: /ˌme.təˈpɛl.mə/

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Identification

Metapelma can be distinguished from other eupelmid by its relatively large size (approximately 6 mm body length) for a chalcidoid . The genus possesses the characteristic eupelmid mesothoracic modification enabling jumping with the middle legs, though this trait is shared with other Eupelminae. Identification to level requires examination of specific morphological characters detailed in taxonomic keys for Oriental and Palaearctic regions.

Images

Habitat

Forest and woodland environments, specifically associated with dead or dying trees containing wood-boring larvae. have been observed on tree trunks with exposed dead wood.

Distribution

Globally distributed. Documented from China (Beijing, Guizhou), India, Kenya, and other regions across the Oriental, Palaearctic, Afrotropical, and other biogeographic realms. Specific distribution varies by .

Host Associations

Life Cycle

Solitary development; a single larva develops per larva. occurs within the host gallery, typically 5–10 mm beneath the bark in xylem tissue. emerge 5–8 days after pupal collection in observed cases.

Behavior

Solitary habit; exhibits synparasitism (co-occurrence with other such as Spathius ochus on the same individual). may be encountered directly on tree trunks with exposed dead wood, unusual for chalcidoid wasps of this size.

Ecological Role

Natural enemy and potential agent of wood-boring beetles, including pest in ornamental and economically valuable trees. May help regulate of Cerambycidae and Buprestidae in forest .

Human Relevance

Potential for use in of agricultural and forest pests, particularly wood-boring beetles that damage timber and ornamental trees. Direct observation possible due to relatively large size compared to other chalcidoids.

Similar Taxa

  • EupelmusBoth belong to Eupelmidae; Metapelma distinguished by larger size (~6 mm vs. typically smaller) and association with wood-boring rather than the diverse hosts of Eupelmus including scale insects, , and spider
  • SpathiusBoth parasitize wood-boring beetles and may co-occur on same ; Metapelma is solitary while Spathius is typically gregarious, and they belong to different (Eupelmidae vs. Braconidae)

More Details

Taxonomic Note

The placement of Metapelma has been subject to revision. While some sources list Metapelmatidae as a distinct family, others classify Metapelma within Eupelmidae. The Catalogue of Life and NCBI recognize Metapelmatidae as a separate family, while GBIF places the in Eupelmidae.

Fossil Record

The includes one fossil , †Metapelma archetypon Gibson, 2009.

Sources and further reading