Scientists from Kalyani University and Cairo University described a new parasitoid wasp, Tetrastichus narayandebnathi, from Rajarhat, West Bengal. The discovery was published in the International Journal of Tropical Insect Science (Springer Nature).
Discovery
- Species: Tetrastichus narayandebnathi, a newly described hymenopteran parasitoid.
- Location: Rajarhat, West Bengal.
- Nomenclature: Named after Bengali cartoonist Narayan Debnath (creator of Batul and Nonte‑Phonte).
- Publication: Accepted in the International Journal of Tropical Insect Science (Springer Nature).
Host association and biology
- Host: Associated with a tortoise beetle pupa (Cassidinae, family Chrysomelidae).
- Parasitism type: Gregarious primary parasitoid — multiple conspecific larvae develop within a single host and the wasp attacks the host directly.
- Reproductive record: Eight adult parasitoids emerged from one collected pupa (five females, three males).
Taxonomy and validation
- Genus context: Tetrastichus belongs to family Eulophidae (superfamily Chalcidoidea).
- Rarity of host record: Only the third documented global instance of Tetrastichus parasitising Cassidinae.
- Indian records: Second report from India among 86 valid Indian Tetrastichus species.
- Validation: Pupal identification confirmed by University of Wrocław; morphological work at iForNature research lab; collaborators include Lund University experts.
IASPOINT Booster Facts
- Parasitoid vs parasite: Parasitoids ultimately kill the host; parasites typically do not.
- Cassidinae: Known as tortoise beetles; a subfamily within Chrysomelidae with many species as leaf feeders.
- Taxonomic practice: New insect species descriptions require holotype designation, morphological diagnosis and publication in a peer‑reviewed journal.