Ilyobius Enderlein 1910
Creators: name: Ardila-Camacho, Adrian
name: Rivera-Gasperín, Sara Lariza
name: Martins, Caleb Califre
name: Contreras-Ramos, Atilano
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Megaloptera
Sialidae
Ilyobius

description: Key to world extant species of Ilyobius
(after Liu et al. 2015b)
1. Thorax: Pronotum pale, uniformly orange to reddish brown (fig. 12A) .......................................... 2
‒ Thorax: Pronotum dark, usually black, sometimes with pale markings (Liu et al. 2015b: fig. 3) ....... 8
2. Head: without posteriorly trifurcate dark marking around compound eyes (Liu et al. 2015b: fig. 3) ... 3
‒ Head: with posteriorly trifurcate dark markings around compound eyes (Liu et al. 2015b: fig. 5) ..... 5
3. Head: blackish brown ....................................................................................................................... 4
‒ Head: uniformly orange brown (Contreras-Ramos 2006: fig.1).......................................................... ....................................................................................... I. ranchograndis (Contreras-Ramos, 2006)
4. Head: dark orange on median portion of vertex (Liu et al. 2015b: fig. 3) .......................................... ............................................................................................................. I. flavicollis (Enderlein, 1910)
‒ Head: completely dark brown, including the median portion of vertex (Fig. 12A–B) ...................... .......................................................................................................... Ilyobius nigrocephalus sp. nov.
5. Head: frons without any dark marking ............................................................................................. 6
‒ Head: frons with a pair of ovoid black spots between antennal fossae (Fig. 9A–B) .......................... .............................................................................................................. I. bimaculatus (Banks, 1920)
6. Male abdomen: gonocoxite 9 short, ovoid, not directed posterodorsad (Liu et al. 2015b: fig. 8), male gonocoxites 11 with median processes directed posteriad (Liu et al. 2015b: fig. 8) ........................ 7
‒ Male abdomen: gonocoxite 9 elongate and strongly directed posterodorsad (Contreras-Ramos 2008: fig. 10), male gonocoxites 11 with median processes directed ventrad (Contreras-Ramos 2008: fig. 10) ..................................................................................................... I. flammatus (Penny, 1981)
7. Forewing: length more than 11.0 mm in males and 12.0 mm in females; male abdomen: gonocoxites 11 with median processes straightly directed posteriad (Liu et al. 2015a: fig. 14g); female abdomen: fused gonocoxites 8 bluntly prominent posteriad (Liu et al. 2015a: fig. 15d)..................................... ............................................................................................................... I. mexicanus (Banks, 1901)
‒ Forewing: length less than 9.0 mm in males and 10.0 mm in females; male abdomen: gonocoxites 11 with median processes distinctly curved posteroventrad on distal half (Liu et al. 2015b: fig. 8); female abdomen: fused gonocoxites 8 strongly narrowed posteriad (Liu et al. 2015b: fig. 11) ......... ............................................................................................................... I. curvatus Liu et al., 2015b
8. Head: orange with a median black stripe extending from middle of vertex to frons; male abdomen: sternite 9 posteriorly with a long digitiform, median projection and a pair of short lateral projections (Contreras-Ramos et al. 2005: fig. 3) ............................................................................................... 9
‒ Head: orange with three broad black markings on frons and lateral portions of vertex, but middle of vertex without dark marking (Contreras-Ramos 2008: fig. 3); male abdomen: sternite 9 posteriorly with a long digitiform, median projection, but without any posterolateral projections (Liu et al. 2015a: fig. 14b) .............................................................................................. I. chilensis (McLachlan, 1871)
9. Head: with median black stripe anteriorly, not approaching compound eyes (Contreras-Ramos et al. 2005: fig. 1); female abdomen: gonapophyses 8 posteriorly convex (Contreras-Ramos et al. 2005: fig. 6) ................................................................................. I. hauseri (Contreras-Ramos et al., 2005)
‒ Head:with median black stripe anteriorly expanded and approaching compound eyes (Liu et al. 2015b: fig. 12); female abdomen: gonapophysis 8 posteriorly broadly concave (Liu et al. 2015b: fig. 14) .. ...................................................................................................................... I. nubilus (Navás, 1933)
description: Published as part of Ardila-Camacho, Adrian, Rivera-Gasperín, Sara Lariza, Martins, Caleb Califre & Contreras-Ramos, Atilano, 2021, A reappraisal of the taxonomy of Neotropical Sialidae (Insecta: Megaloptera): with the description of a new genus from Cuba, pp. 21-54 in European Journal of Taxonomy 782 on pages 43-44, DOI: 10.5852/ejt.2021.782.1587, http://zenodo.org/record/5761433