ILYOCORINAE, Sites, 2022

Sites, Robert W., 2022, Phylogeny and revised classification of the saucer bugs (Hemiptera: Nepomorpha: Naucoridae), Zoological Journal of the Linnean Society 195, pp. 1245-1286 : 1261-1262

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

1262 R.W. SITES

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.

Figures

Figure 7. Valvulae of female Ilyocoris cimicoides with dentate margins. vlf = valvifer, vlv = valvula.

Figure 8. Mesofemora of Ilyocoris cimicoides (a) and Placomerus sp. (b) showing the posterodorsal margin flattened and fringed with a dense brush-line of hairs.

Figure 10. Habitus examples of each subfamily: Ambrysinae: Ambrysus signoreti (a), Cheirochelinae: Cheirochela thailandana (b), Cryphocricinae: Cryphocricos hungerfordi (c), Ilyocorinae: Ilyocoris cimicoides (d), Laccocorinae: Laccocoris limicola (e), Limnocorinae: Limnocoris inornatus (f), Macrocorinae subfam. nov.: Macrocoris flavicollis (g), Naucorinae: Naucoris scutellaris (Thailand) (h).

Figure 11. Examples of male genital capsule with pygophore, aedeagus and parameres (terga IX and X removed) for each subfamily: Ambrysinae: Ambrysus lunatus (a), Cheirochelinae: Coptocatus kinabalu (b), Cryphocricinae: Cryphocricos hungerfordi (c), Ilyocorinae:Ilyocoris cimicoides (d), Laccocorinae: Laccocoris spurcus (e), Limnocorinae: Limnocoris ovatulus (f), Macrocorinae subfam. nov.: Macrocoris flavicollis (g), Naucorinae: Afronaucoris gen. nov.: Afronaucoris madagascariensis (h).