A New Genus and Two New Species of the Subfamily Nesomesochorinae Ashmead (Insecta: Hymenoptera: Ichneumonidae)


Nesomesochorinae is a rather small subfamily of Darwin wasps (Insecta: Hymenoptera: Ichneumonidae), only with three described genera. We recognize a fourth nesomesochorine genus from Perú and describe it as a new genus, Bina Shimizu & Alvarado gen. nov. The new genus is distinguished from previously described genera of Nesomesochorinae by the following combination of character states: mandible parallel-sided proximally and abruptly strongly narrowed ventroapically so that its lower apical tooth is much smaller and sharper than upper tooth; propodeum with lateromedian longitudinal carinae between anterior and posterior transverse carinae developed on more than posterior 0.9 so that the area superomedia is more or less enclosed; thyridium of 2nd metasomal tergite sometimes very large; 1st metasomal tergite stout and arched; body highly shiny. Binagen. nov. comprises two species also described as new to science: B. huayrurae Shimizu & Alvarado sp. nov. (type species of Binagen. nov.) and B. nigra Shimizu & Alvarado sp. nov. Identification keys to genera of Nesomesochorinae and to species of Binagen. nov. are provided.

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We would like to thank Gavin Broad (NHMUK) for commenting on an early draft of this paper and supporting our investigation at NHMUK; Gerardo Lamas (MUSM) for his support at MUSM; Zoltán Vas (Hungarian Natural History Museum, Budapest, Hungary) for providing useful information of Szépligeti’s types of the Neotropical Nesomesochorinae. This work has been partially carried out under project “Discovery new species and Amazon Cam,” co-financed by the “Programa Nacional de Innovación para la Competitividad y Productividad – Innóvate Perú” and TRees-Peru. Collecting permits were issued by the Peruvian Ministry of Agriculture and Irrigation (No. 055 c/c-2008-INRENA-IANP, RDG No. 0124-2015-SERFOR-DGGSPFFS, No. 301-2015/019-2017/SERFOR / DGGSPFFS).

Author Contribution Statement

SS conceived and designed this study, performed measurements, taken photos, and drafted the manuscript. MA participated in the design of the study, carried out field work, performed measurements, and helped to draft the manuscript. SS and MA contributed in the form of discussions and approved the final manuscript.


This work was supported by the Grant-in-Aid for JSPS Fellows (Grant Number 18J20333) from the Japan Society for the Promotion of Science for SS and the JSPS Overseas Challenge Program for Young Researchers to carry out SS’s research at NHMUK.

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Correspondence to S. Shimizu.

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Shimizu, S., Alvarado, M. A New Genus and Two New Species of the Subfamily Nesomesochorinae Ashmead (Insecta: Hymenoptera: Ichneumonidae). Neotrop Entomol (2020). https://doi.org/10.1007/s13744-020-00778-7

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  • Darwin wasps
  • identification key
  • Neotropical
  • Ophioniformes
  • parasitoid wasps
  • taxonomy