Metapelma

Westwood, 1835

Metapelma is a of parasitic and the sole genus in the Metapelmatidae. Members are of wood-boring , particularly in families and . The genus is globally distributed with approximately 40 described . At roughly 6 mm in body length, Metapelma species are notably large compared to other 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 by its relatively large size (approximately 6 mm body length) for a . 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 for Oriental and Palaearctic regions.

Images

Habitat

Forest and woodland environments, specifically associated with dead or dying trees containing wood-boring . 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 . Specific distribution varies by .

Host Associations

Cerambycidae - longhorn ; wood-borers
Buprestidae - including Coraebus cavifrons; wood-boring in tree trunks

Life Cycle

development; a single 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 of this size.

Ecological Role

and potential agent of wood-boring , including in ornamental and economically valuable trees. May help regulate of and in forest .

Human Relevance

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

Similar Taxa

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

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 . 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.