Euwallacea fornicatus

Gallego, Diego, Dios, Miguel Ángel Gómez De, Riba-Flinch, Josep Maria, García-Reina, Andrés, Galián, José, Mas, Hugo, Lencina, José Luis, Zafra, María, Henares, Ignacio, Rodríguez, Francisco, Alcázar, María Dolóres, Knížek, Miloš & Gómez, Demian F., 2025, Euwallacea similis (Ferrari), a new ambrosia beetle (Coleoptera: Curculionidae: Scolytinae) for the Iberian Peninsula, and new records on Euwallacea fornicatus (Eichhoff), Xyleborus bispinatus Eichhoff and Amasa parviseta Knížek & Smith, Zootaxa 5673 (1), pp. 63-78 : 68-70

Euwallacea fornicatus

The phylogenetic tree generated from our analyses ( Figure 3 ) revealed that the majority of Euwallacea species clustered into four main clades, consistent with the findings of Gómez et al. (2018) and Smith et al. (2019). The 12 samples from Spain are nested together with all the PSHB clade, assigned to E. fornicatus by Smith et al. (2019). A single haplotype was identified in the Spanish samples, distinct from the H33 haplotype reported in Israel, the USA, and South Africa ( Stouthamer et al. 2017). Phylogenetically, our samples may be more closely related to haplotypes found in Japan, China, and Vietnam.

A total of 241 specimens of E. fornicatus have been captured in the trap network in Motril, between early June and early November 2024 ( Table 1, Figure 1 ). Additionally, infestations were detected in ornamental A. negundo (17 infested trees) and P. aculeata (1 infested tree). In October 2023, infestations were also detected in three orchards of P. americana ( Lauraceae ) and in Ricinus communis L. ( Euphorbiaceae ) ( CAPADR 2024). Local authorities are implementing measures to eradicate the outbreak in accordance with national and European plant protection regulations.

Figures

FIGURE 1. Records of populations of the alien Xyleborini species. Blue diamonds: present work. Red diamond: possible record. Green triangles: previous records of Amasa parviseta (Knížek & Smith 2024), Euwallacea similis (Toccafondi et al. 2025) and Xyleborus bispinatus (Gallego et al. 2022). Spanish province codes: Gr: Granada; Al: Almería; Mu: Murcia; Ac: Alicante; Va: Valencia; Ca: Castellón; Ma: Mallorca.

FIGURE 3. Bayesian phylogenetic tree obtained for the analysis of multiple Euwallacea sequences including samples collected in Spain. The node values indicate the posterior probability.