Aegomorphus signatifrons Santos-Silva et al. (2020a) : 36

Silva Júnior, José O., Haseyama, Kirstern L. F. & Souza, Diego de S., 2021, Phylogenetic approach redefines Plistonax (Coleoptera, Cerambycidae, Lamiinae) with new combinations and a new genus of flat-faced long-horned beetles, Organisms Diversity & Evolution (New York, N. Y.) 21 (2), pp. 491-520 : 514

Aegomorphus signatifrons Santos-Silva et al. (2020a): 36 (comb. nov.); Monné 2021 (cat).

Type locality: holotype (female) – Ecuador, Naranjito ( MNRJ) ( Fig. 10h ).( Figs. 2a , 10h ). Pronotum with elongated lateral tubercle (Fig. 4b, 10h). Elytral apex with outer margin projected in a spine ( Fig. 10h ) .

Diagnosis. Frons and elytra with small punctures ( Figs. 2a , 10h ). Pronotum with elongated lateral tubercle (Fig. 4b, 10h). Elytral apex with outer margin projected in a spine ( Fig. 10h ).

Distribution. Ecuador [El Oro, Guayas] (Fig. S4b).

Remarks. The taxonomic history of P. signatifrons is a good example of the problems in the definition of Acanthoderes and Aegomorphus . In the original description of this species, Zajciw (1964) highlighted the presence of the internal seta in the elytral punctures as distinct within the species of Acanthoderes , but did not mention the feature in Plistonax . Our phylogenetic analyses suggest that this species is closer to Plistonax (Fig. 7). P. signatifrons is known only from Ecuador. It was not possible to investigate the type material, which was lost in a fire that destroyed many specimens housed in the Museu Nacional (MNRJ) in 2018. However, there is a photographic register of the holotype digitally available in Monné et al. (2021).

Figures

Fig. 10 Holotypes of some species of Plistonax: a Plistonax multipunctatus Thomson, 1864 (=P. albolinitus). b Plistonax albituberculatus Silva Júnior & Souza, 2019. c Acanthoderes albolinitus Bates, 1861 (=P. albolinitus). d Plistonax antonkozlovi Santos-Silva, Nascimento & Silva Júnior, 2020. e Acanthoderes ariasi Chemsak & Hovore, 2002 (=P. ariasi comb. nov.). f Acanthoderes bialbomaculata Zajciw, 1964 (=P. bialbomaculatus). g P. senecauxi

Fig. 2 Character photographs: a 2:0 frons with small punctures (anterior view, Aegomorphus jaspideus). b 2:1 frons with large punctures (anterior view, A. travassosi). c 21:0 mesoventral process with antero-lateral tuber- cles slightly elevated (lateral view, Plistonax albolinitus). d 21:1 mesoventral process with antero-lateral tubercles very ele- vated (lateral view, Acanthoderes (Acanthoderes) daviesii). e 4:1 male’s antennomeres VI–XI with tubercles in the inner surface and 11:1 male’s antennomeres IX–XI with black setae in the inner sur- face (lateral view, male of P. albolinitus). f 6:1 antennomere III with darker stain near apex, 7:1 antennomere III with darker stain near base, 8:1 antennomere IV with darker stain near base, 9:0 antennomeres IV–XI with darker stain near apex in subapical posi- tion, and 10:1 antennomeres III– VII with erect setae in the inner surface (dorsal view, P. rafaeli). g 9:1 antennomeres IV–XI with darker stain near apex in apical position (dorsal view, P. insolitus). White dashed lines highlight the character states 2:0 and 2:1; blue arrows highlight the character states 6:1, 7:1, 8:1, 9:0, and 9:1; red arrows highlight the character state 10:1. Scale bars: 1 mm