SUBFAMILY ILYOCORINAE STAT. REV.

FIGS 7, 8, 10D, 11D

Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org:act: CBCF3B3B-1324-486F-BD2C-95230D825861

Type species: Ilyocoris cimicoides (Linnaeus, 1758), as Nepa cimicoides .

Taxonomic history: Previously, the genera Ilyocoris Stål, 1861, Placomerus and Pelocoris were held

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in Naucorinae: Naucorini (Štys & Jansson, 1988). Later, López Ruf & Bachmann (1987) erected the tribe Pelocorini to hold Placomerus, Pelocoris and Carvalhoiella, separate from Naucorini because they followed De Carlo’s (1971) hemispherical splitting of the family into two families, Naucoridae and Pelocoridae (= Limnocoridae). Although Carvalhoiella clearly was misplaced in Pelocorini, the genus had been transferred to Naucorini by Nieser (1975), but later was appropriately transferred back to Ambrysinae (Nieser et al., 1999) . During this interim, López Ruf & Bachmann (1987) followed Nieser in recognizing Carvalhoiella to be a member of this group, which they recognized as Pelocorini . Following the transfer of Pelocoris from Naucorinae: Pelocorini to Ambrysinae, only Ilyocoris and Placomerus remained in the tribe; thus the tribe Pelocorini necessarily became Ilyocorini (ReynosoVelasco & Sites, 2021).

Revised taxonomy: With the recent transfer of Pelocoris from Naucorinae to Ambrysinae (ReynosoVelasco & Sites, 2021) and clear association of Ilyocoris and Placomerus as sister genera distinct from all others, I here remove these genera from Naucorinae by elevating the tribe Ilyocorini to subfamily status as Ilyocorinae .

Diagnosis: The female genitalia are strongly dentate along the dorsal and lateral margins of valvulae 1 and lateral margins of valvulae 2 (Fig. 7). The male parameres are twisted, contoured (López-Ruf & Bachmann, 1991), elongated, overlapping and symmetrical or with only slight asymmetry (Fig. 11d). The mesofemur posterodorsal margin is flattened and fringed with a dense brush-line of hairs (Fig. 8).

Comments: The condition of the mesofemur in which the posterodorsal margin is flattened and fringed with a dense brush-line of hairs (also present in many members of Laccocorinae) had been used to distinguish between Placomerus and Pelocoris (La Rivers, 1956) . Those two genera are superficially so similar that La Rivers (1956) prepared a list of features to distinguish between them. However, Pelocoris was shown recently to be distantly related to Placomerus and is now in a different subfamily ( Ambrysinae). Ilyocoris is Palaearctic and Placomerus Neotropical in distribution.