Peltariosilis guyanensis ( Pic, 1906 )

Biffi, Gabriel & Geiser, Michael, 2020, A revision of Peltariosilis Wittmer (Coleoptera: Cantharidae), a surprisingly diverse Amazonian radiation, Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 60 (16), pp. 1-26 : 5-6

Peltariosilis guyanensis ( Pic, 1906)

( Figs. 5B , 8 E-I, 10B, 12B)

Silis guyanensis Pic, 1906: 92 ; Delkeskamp 1939: 179; Blackwelder 1945: 367.

Silis (Peltariosilis) guyanensis, Wittmer, 1952: 203 ; Delkeskamp 1977: 286; Constantin 2010a: 41.

Peltariosilis guyanensis, Constantin 2010b: 16 ; 2017: 61.

Type material examined: LECTOTYPE ♂ ( MNHN), new designation: “Cayene // SYNTYPE // Silis / guyanensis / Pic 1906 / R. Constantin det. 2009 // Peltariosilis / guyanensis / (Pic) / det. W.Wittmer ” ( Fig. 8 E-I) . PARALECTOTYPE ♂ ( NHMB): “DÉCEMBRE // GUYANE FRANÇSE / St- Laurent du Maroni / COLLECTION LE MOULT // cotype // Naturhistorisches / Museum Basel / Coll. W. Wittmer // CANTHARIDAE / CANTH 00018168”. PARALECTOTYPE ♂ ( NHMB): “ AVRIL // GUYANE / NOUVEAU CHANTIER / BAS-MARONI // cotype // Silis / guyanensis / Pic // Naturhistorisches / Museum Basel / Coll. W. Wittmer // CANTHARIDAE / CANTH 00017764”.

Other material examined: “ FRENCH GUIANA / Montagne des Chevaux / Window trap; xi.2009; 4˚36′37.6″N 52˚16′44.5″W / altitude ~ 225 m a.s.l. // BMNH (E) / 2010-62” (2 ♂, BMNH) ; “Zanderij I, Boven / Para Dist. SURINAM / April 19 1927 // Cornell U. / Lot 760 / Sub 28 // Naturhistorisches / Museum Basel / Coll. W. Wittmer ” (1 ♂, NHMB) ; “Zanderij I, Boven / Para Dist. SURINAM / April 26 1927 // Cornell U. / Lot 760 / Sub 41 // Naturhistorisches / Museum Basel / Coll. W. Wittmer ” (1 ♂, NHMB) .

Diagnosis: Antennae dark brown, yellow at apex of antennomere XI; head entirely black; pronotum and scutellum orange, slightly translucent; elytra black, except for undefined lighter lateral margins and sutures; legs light yellow, except for tarsi, light brown; thorax and abdomen dark brown. Male ( Fig. 5B ): Antennomeres IX-XI narrower than preceding ones.Pronotum ( Fig.10B ):anterior margin broadly arched; frontolateral lobes narrow, projected laterally; sides behind frontolateral lobe convergent posteriorly; laterobasal lobe with dorsal flap long, strongly curved, hook-like projection directed medially and ventral flap forming a sharp lamellar projection; dorsal projections broadly rounded directed posteriorly and laterally. Scutellum ( Fig. 12B ) with a short trapezoidal lamellar projection, wide at base, slightly narrowed at apex, distal margin almost straight, with two slightly projecting tips at angles. Peltariosilis guyanensis differs from P. mensaemontis by the apex of dorsal flap of laterobasal lobe of pronotum, forming a sharp hook direct- ed internally.

Distribution: Suriname, French Guiana ( Fig. 18 ).

Remarks: Pic (1906) described this species from an unspecified number of males from “Cayenne”. We found three male specimens at MNHN and NHMB, all with different locality data, which we here consider part of the original type series. This includes a specimen at NHMB cited as a non-type by Constantin (2010a), which however bears a “cotype” label in Pic’s handwriting. The male syntype at MNHN, in Pic’s own collection, is here designated as the lectotype.

Figures

Figure 5. Habitus of Peltariosilis species. (A) P. amapaensis (Wittmer, 1966). (B) P. guyanensis (Pic, 1906). (C) P. mensaemontis Constantin, 2017. (D) P. lamellata Constantin,2017.(E) P.diversicollis sp.nov.(F)P.major sp.nov.Allfigures inthe same scale.Scale bar = 2.0 mm.

Figure 8. Primary types of Peltariosilis species. (A-D) Holotype of Silis (Peltariosilis) amapaensis Wittmer, 1966. (A) Lateral. (B) Ventral. (C) Pronotum. (D) Labels. (E-I)Lectotype of Silis guyanensis Pic,1906.(E) Dorsal.(F-H) Pronotum.(I) Labels.

Figure 10. Pronotum of Peltariosilis species, males. (A) P. amapaensis (Wittmer, 1966). (B) P. guyanensis (Pic, 1906). (C) P. mensaemontis Constantin, 2017. (D) P. lamellata Constantin, 2017. (E) P.diversicollis sp. nov. (F) P.major sp. nov. (G) P.gracilicornis sp. nov. (H) P.scutulata (Wittmer, 1952). (I) P.flavicornis sp. nov. (J)P.orientalis sp.nov.(K) P.cleidecostae sp.nov.(L) P.brancuccii sp.nov.(M) P.parviscutellarissp.nov.(N) P.mitarakaemontis Constantin,2017.(O) P.brunneoapicalis sp.nov.B, C,D and N modified from Constantin (2017).All figures in the same scale,except B, C,D and N.Scale bar = 0.5 mm.

Figure 12. Scutellar projection of Peltariosilis species, males. (A) P. amapaensis (Wittmer, 1966). (B) P. guyanensis (Pic, 1906). (C) P. mensaemontis Constantin, 2017. (D) P.lamellata Constantin, 2017. (E) P.diversicollis sp. nov. (F) P.major sp.nov.(G) P.gracilicornis sp.nov.(H) P.scutulata (Wittmer,1952). (I) P. flavicornis sp. nov. (J) P. orientalis sp. nov. (K) P. cleidecostae sp. nov. (L) P.brancuccii sp. nov. (M) P.parviscutellaris sp. nov. (N) P. mitarakaemontis Constantin, 2017. (O) P.brunneoapicalis sp.nov.All figures in the same scale. Scale bar = 0.5 mm.

Figure 18. Distribution of Peltariosilis species.