Canthon (Peltecanthon) terciae

Nunes, Luis Gabriel de O. A., Nunes, Rafael V. & Vaz-De, Fernando Z., 2020, Taxonomic revision of the South American subgenus Canthon (Peltecanthon) Pereira, 1953 (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilini), European Journal of Taxonomy 594, pp. 1-27: 18-23

publication ID

https://doi.org/10.5852/ejt.2020.594

publication LSID

lsid:zoobank.org:pub:53DE5999-628D-47F5-9973-67CC54D06BC6

DOI

http://doi.org/10.5281/zenodo.3664181

persistent identifier

http://treatment.plazi.org/id/36733D04-FFE4-FFCE-FD82-FED5FEEDFBEF

treatment provided by

Plazi

scientific name

Canthon (Peltecanthon) terciae
status

sp. nov.

Canthon (Peltecanthon) terciae  sp. nov.

urn:lsid:zoobank.org:act:C9F36543-7F9D-4498-ABAF-3784D46A2E60

Figs 7–9View FigView FigView Fig

Diagnosis

Canthon terciae  sp. nov. can be distinguished by the following combination of characters: elytra and pronotum dorsally red or green reddish ( Fig. 7AView Fig). Legs with flat metafemur at the base, with no punctures or groove ( Fig. 7BView Fig). Hypomeron with thin transverse carina between the anterior and posterior portion, projecting to the median region, never near the lateral margin, anterior region without excavation ( Fig. 7CView Fig). Propygidium with strong carina near pygidium edge ( Fig. 7DView Fig). Parameres, in lateral view ( Fig. 8AView Fig): flattened; truncated apex, sub-straight, never sinuous; slightly rounded upper angle; lower right angle. In dorsal view ( Fig. 8BView Fig): membranous portion separating the parameres, wider in the central region and narrower at the base and at the apex. Internal sac ( Fig. 8View Fig C–D). Peripheral fronto-lateral sclerite (FLP) involving the axial sclerite (A), the two structures form a complex with a central duct, wider at the base, which gradually tapers to the apex, which is much thinner; subaxial sclerite (SA), smaller than in C. staigi  , lateral to the FLP + A complex; peripheral medial sclerite (MP), without central dentin at the inner margin, distal to A, lateral in relation to FLP + A tapered region, with the sharper part passing within a semiduct formed by MP; superior right peripheral sclerite (SRP) with lateral angular prolongation.

Etymology

This species is named in honour of Dr Tercia Vargas dos Santos, who developed phylogeographical studies with the subgenus Peltecanthon  and reinforced our taxonomic decision.

Material examined

Holotype

BRAZIL • ♂; (white label) “ Rio Grande do Norte, Baia Formosa, Mata Estrela , 35°1′5″ W, 6°23′19″ S, 44 m, 24-V-2007, leg. J. A. Rafael & F. F. Xavier Fº ( CEMT)”.GoogleMaps 

Paratypes (98 specs)

BRAZIL – Rio Grande do Norte • 1 ♂, 1 ♀; Baia Formosa, Mata Estrela ; 35°01′5″ W, 6°23′19″ S; 44 m a.s.l.; 24 May 2007; J.A. Rafael and F.F. Xavier Fº leg.; CEMTGoogleMaps  1 ♂; Baia Formosa, RPPN Mata Estrela ; 35º01′0.7″ W, 6º22′53.2″ S; 1 Oct. 2013; C.M.Q. Costa Endres leg.; pitfall, “fezes humanas”; CEMTGoogleMaps  . – Paraíba • 2 ♀♀; João Pessoa , DSE/UFPB; A.A. Endres leg.; CEMT  2 ♂♂, 6 ♀♀; João Pessoa [Lagoa Seca]; 35º50′ W, 7º10′ S; May 2002; M.I.M. Hernández leg.; “floresta”; “armadilha pitfall ”; CEMTGoogleMaps  2 ♂♂, 6 ♀♀; same collection data as for preceding; BMNHGoogleMaps  6 ♂♂, 3 ♀♀; Mamanguape, Rebio Guaribas ; 35º10′ W, 6º41′ S; 2002; M.I.M. Hernández leg.; “floresta”; “armadilha de interceptação de vôo”; CEMTGoogleMaps  1 ♂, 1 ♀; same collection data as for preceding; BMNH; 2 ♂♂, 1 ♀; same collecting data as for preceding; Jan.– Feb. and Apr. 2002; A.A. Endres leg.; “mata”; “armadilha pitfall ”; CEMTGoogleMaps  10 ♂♂; same collecting data as for preceding; Jun. 2002; M.I.M. Hernández leg.; “floresta”; “armadilha pitfall ”; CEMTGoogleMaps  4 ♂♂, 3 ♀♀; Rio Tinto, Rebio Guaribas ; 35º4′ W, 6º46′ S; Mar. 2002; M.I.M. Hernández leg.; “floresta”; “armadilha pitfall ”; CEMTGoogleMaps  1 ♂; Mamanguape, Rebio Guaribas ; 35º11′58.8″ W, 6º43′32.3″ S; 30 Sep. 2013; C.M.Q. Costa Endres leg.; pitfall, “fezes humanas”; CEMTGoogleMaps  2 ♀♀; Guaribas, Reserva Biológica de Guaribas; 3 May 2014; Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  1 ♂; Areia, Mata do Pau Ferro ; 35º42′ W, 6º58′ S; Apr. 2004; P.S. Coroca leg.; floresta, pitfall; CEMTGoogleMaps  5 ♂♂, 3 ♀♀; Caaporã, Mata do Pau Ferro ; 34º57′15.27″ W, 7º28′8.89″ S; 20 Apr. 2013; C.N. Liberal leg.; frag. A, pitfall 3; “fezes”; CEMTGoogleMaps  1 ♂, 1 ♀; same collection data as for preceding; BMNHGoogleMaps  . – Pernambuco • 3 ♀♀; Itamaracá, Vila Velha; 11–13 May 2011; Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  1 ♀; same collection data as for preceding; 5 Oct. 2011; CEMT  2 ♂♂; Araçoiaba , CIMNC; 17 May 2010; K.K.T. Pessoa leg.; pitfall (carne), fechada 4, conjunto 2; CEMT  1 ♂, 1 ♀; same collecting data as for preceding; 28 Feb. 2010; K.K.T. Pessoa leg.; pitfall (carne), aberta 1, conjunto 2; CEMT  2 ♂♂, 1 ♀; same collecting data as for preceding; 15 May 2010; R.S. Correia leg.; (P. A.) carne e fezes, fechada 1 and 2 – 17:00; CEMT  3 ♂♂; same collecting data as for preceding; 17 Apr. 2010; R.S. Correia leg.; (P. A.) fezes e carne, fechada 1 and 2, aberta 6 – 17:00; CEMT  2 ♂♂; same collecting data as for preceding; 12 Jun. 2010; R.S. Correia leg.; (P. A.) carne, fechada 2 – 17:00; CEMT  2 ♂♂; Paudalho , CIMNC; 16 Jun. 2009; A.A. Costa leg.; pitfall; CEMT  2 ♂♂; same collecting data as for preceding; 30 Oct. 2010; R.S. Correia leg.; (P. A.) carne, fechada 1 – 17:00; CEMT  1 ♂, 2 ♀♀; same collecting data as for preceding; 31 Oct. 2010; R.S. Correia leg.; (P. A.) carne, fechada 1 – 7:00; CEMT  3 ♀♀; Caruaru; 5 Jul. 2012; Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  1 ♂, 3 ♀♀; Pesqueira, Serra do Ororubá [Ororoba]; 1 Jul. 2013; Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  1 ♂, 2 ♀♀; Bonito, Brejo de Altitude; 2–4 Jun. 2011; Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  2 ♂♂, 1 ♀; Tamandaré; 8 Jan. 2010; R.C. Moura and Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  . – Sergipe • 2 ♀♀; Santa Luzia do Itanhy; 26 Jun. 2017; I.C. Amorin and Laboratório de Biodiversidade e Genética de Insetos leg.; CEMT  .

Description

Holotype (male)

MEASUREMENTS. Body length (except the head): 10.0 mm, pronotum width: 7.0 mm.

COLOUR. Dorsally red with bright green. Ventrally green with bright red ( Fig. 7AView Fig).

HEAD. Red with bright green. Dorsal surface with small spots equally spaced. Two clypeal teeth triangular, with rounded apex, separated by a V-shaped emargination, with two tuft of setae dorsally and two tufts ventrally. Clypeo-genal suture present ( Fig. 7AView Fig).

PRONOTUM. Pronotal disc smooth, red, bright, with small punctures equally spaced. Anterior angles acute ( Fig. 7AView Fig).

ELYTRA. Striae narrow, distinctly impressed. Interstriae wide, flat ( Fig. 7AView Fig).

HYPOMERON. Green, chagrinated microsculpture. Sparse setae present on anterior portion and anterolaterally. With thin transverse carina between the anterior and posterior portion projecting to the median, region anterior not excavated ( Fig. 7CView Fig). Anterior portion flat, with a little tooth anterolaterally ( Fig. 7CView Fig).

LEGS. Protibiae with three teeth. Protibial spur flattened dorsoventrally, bifid, with medial and lateral triangular bifurcation with different sizes, asymmetrical ( Fig. 7EView Fig). Meso- and metafemoral ventral side lacking anterior and posterior margin. Metafemora with a narrower and longer base, claviform ( Fig. 7BView Fig).

ABDOMEN. Ventrite glabrous, chagrinated. Black and green.

PYGIDIUM. As wide as long. Red with bright green. Basal margin expanded, forming a strong carina in V-form between pygidium and propygidium.

PARAMERES. Flattened laterally. On lateral view, apical portion ventrally truncated, dorsally a little curve. In dorsal view, central membranous portion enlarged in the centre ( Fig. 8View Fig A–B).

INTERNAL SAC ( Figs 8–9View FigView Fig). Fronto-lateral peripheric sclerite (FLP) involving axial sclerite (A) forming a central duct with spiniform apex, very slim. Subaxial sclerite (SA) small, lateral to FLP + A complex and MP, dorsal to all sclerites. Medial peripheric sclerite (MP) semicircular, widely emarginated, with the internal margin continue (without central tooth), margin external sinuous; Apex of the FLP + A complex involved by MP. Superior right peripheral sclerite (SRP) circular, with lateral prolongation in the dorsoventral direction.

MORPHOLOGICAL VARIATION. Body length (except the head) ranges from 8.5 to 11.5 mm; pronotum width from 6 to 7.5 mm. Colour: dorsally green with bright red. Legs: metafemoral ventral surface not completely smooth, with some punctures.

Female

LEGS. Protibial spur with medial and lateral bifurcation triangular with equal sizes, symmetrical ( Fig. 7FView Fig).

Remarks

This new species is much more similar to C. staigi  than to the other two species of Peltecanthon  . The differences between them are very subtle, and there are great morphological similarities between them, in the main characters that differentiate the species of this subgenus; the main differences observed are in the sclerites of the internal sac (exactly in MP). In addition to the sclerite, these species ( C. staigi  and C. terciae  sp. nov.) can be differentiated only by the characters of the dorsal colour and base of the metafemur, without any need for dissection.

Geographic distribution

Northern Brazilian Atlantic Forest, in the states of Rio Grande do Norte, Paraíba, Pernambuco and Sergipe ( Fig. 10View Fig).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scarabaeidae

Genus

Canthon