Dichotomius (Luederwaldtinia) tristis ( Luederwaldt, 1923 ),

Montoya-Molina, Santiago & Vaz-De, Fernando Z., 2021, Taxonomic review of the Dichotomius (Luederwaldtinia) agenor species group (Coleoptera: Scarabaeidae: Scarabaeinae), European Journal of Taxonomy 734, pp. 1-64: 50-53

publication ID

https://doi.org/10.5852/ejt.2021.734.1233

publication LSID

lsid:zoobank.org:pub:663A0C2D-E3CF-4B0C-8BA1-566B174829A2

DOI

http://doi.org/10.5281/zenodo.4545865

persistent identifier

http://treatment.plazi.org/id/03850669-FFA1-FFFA-FE17-274D3843C91E

treatment provided by

Plazi

scientific name

Dichotomius (Luederwaldtinia) tristis ( Luederwaldt, 1923 )
status

 

Dichotomius (Luederwaldtinia) tristis ( Luederwaldt, 1923) 

Fig. 17View Fig, Map 10

Pinotus tristis Luederwaldt, 1923: 12  (original description).

Pinotus tristis  – Blackwelder 1944: 208.

Dichotomius tristis  – Roze 1955: 44.

Diagnosis

Dichotomius tristis  is separated from other species in the group by the following combination of characters: median tubercle of cephalic carina weakly curved posteriorly and rounded-truncate on apex. Apex of lateral tubercles obtuse. External margin of hypomeron bearing single row of long setae. Metasternal lateral pilosity sparse. Metacoxae with single row of organized ocellate punctures.

Material examined

Holotype VENEZUELA • ♂; “VENEZUELA. 11.74” [white, hw]/ “HOLOTIPO” [red with black margins, p]/ “ Pinotus  tristis  L̹d. L̹d. Det. 23.” [white, hw]/ “18150” [white, p]; MZSP. 

Additional material

BRAZIL – Roraima • 1 ♂, 1 ♀; Amajari Ilha de Maracá ; 3º30.690′ N, 61º35.303′ W; Floresta Amazônica, Pitfall with human faeces; 9 May 2009; R. Andrade leg.; CEMTGoogleMaps  3 ♂♂, 3 ♀♀; Serra da Moça ; primary forest; Jul. 1997; F.Z. Vaz-de-Mello leg.; CEMT  .

COLOMBIA – Casanare • 2 specs; Had. Guarato ; 400 m a.s.l.; 5º19′ N, 72º19′ W; Feb. 1996; A. Lopera leg.; ECCGoogleMaps  2 specs; Pore , Vda. Altamira , Fca. La Esperanza ; 350 m a.s.l.; 5º42′26″ N, 76º3′3″ W; Oct. 2006; I. Quintero and L.E. Franco leg.; IAvHGoogleMaps  . – Cundinamarca • 1 spec.; Paratebueno, Fca. Palumea ; 232 m a.s.l.; 4º20′18.5″ N, 73º11′44.3″ W; 26 Jan. 2013; J.S. Cardenas leg.; IAvHGoogleMaps  . – Guaviare • 1 spec.; San José del Guaviare, Fca. Eli ; 200 m a.s.l.; Aug. 2016; A. Santos leg.; ECC  . – Meta • 36 specs; Acacias, Fca. Buenavista ; 494 m a.s.l.; 3º57.534′ N, 73º41.951′ W; Aug. 2012; L.M. Isaza leg.; IAvHGoogleMaps  89 specs; Barranca de Upía, Fca. Guaycaramo ; 194 m a.s.l.; 4º26′9.9″ N, 72º58′18.4″ W; 14 Mar. 2013; J.S. Cardenas leg.; IAvHGoogleMaps  86 specs; El Dorado; 336 m a.s.l.; 3º42.34′ N, 73º32.56′ W; Llanos orientales ; Aug. 2012; L.M. Isaza leg.; IAvHGoogleMaps  1 ♂; Mozambique, Franja Bosque de galleria ; 190 m a.s.l.; Apr. 1996; Jorge A. Noriega leg.; CEMT  2 specs; PNN, Tinigua, Rio Duda ; 350 m a.s.l.; 2º40′ N, 74º10′ W; Jan. 996; I. Jiménez leg.; IAvHGoogleMaps  1 spec.; Puerto López , El Naranjal ; 220 m a.s.l.; 4º5′14″ N, 72º57′30″ W; Feb. 1997; F. Escobar leg.; IAvHGoogleMaps  116 specs; San Martín, Fca. La Laguna ; 326 m a.s.l.; 3º42.251′ N, 73º32.33′ W; Sep. 2012; L.M. Isaza leg.; IAvHGoogleMaps  1 spec.; San Martín, Nuevo Caney ; 389 m a.s.l.; 3º31′40″ N, 73º14′40″ W; 13 Jul. 2016; C. Giraldo and A. León J. leg.; MUSENUVGoogleMaps  2 ♂♂; San Martín, Had. Tocancipá; 335 m a.s.l.; Sabana-Bosque ; Apr. 2006; J. Noriega leg.; CEMT  1 spec.; Remolino, Cafam Llanos ; 200 m a.s.l.; Apr. 1996; A. Lopera and S. Amézquita leg.; ECC  2 specs; Villavicencio, Via Pto. Colombia ; 150 m a.s.l.; 4º2′91″ N, 75º78′15″ W; Mar. 1998; A. Camacho leg.; IAvH  . – Vaupés • 2 specs; RN Mosiro-Itajura (Caparú), Terrazas ; 100 m a.s.l.; 1º4′ S, 69º31′ W; Sep. 1995; A. Lopera leg.; IAvHGoogleMaps  . – Vichada • 16 specs; Cumaribo; 300 m a.s.l.; 4º36′33″ N, 67º51′52″ W; Selva de Mataven , bosque de cerro rocoso ; 6 Mar. 2007; L.E. Franco leg.; IAvHGoogleMaps  .

VENEZUELA – Amazonas • 1 ♀; 150 m a.s.l.; Aug. 2003; CEMT  1 ♀; Atures, Puerto Ayacucho ; 112; 13 May 2004; D. García-Favreleg.; CEMT  . – Aragua • 1 ♂; Cuyagua ; 50 m a.s.l.; 6 Jul. 2004; D. García leg.; CEMT  1 ♀; NP, Henri Pitter , Choroní ; 29 Jul. 1992; Hornburg leg.; CEMT  . – Barinas • 3 ♂♂, 3 ♀♀; Andrés Eloy Blanco, Res.For. Caparo, Est. Cachicamo ; 159 m a.s.l.; 07º28′16″ N, 71º03′18″ W; human faeces; 22–23 Aug. 2014; R Acconcia and J Gámez leg.; CEMTGoogleMaps  . – Táchira • 4 ♂♂, 3 ♀♀; San Cristobal, Parque Natural Paramillo ; Jul. 1993; J. Blanco leg.; CEMT  1 ♂, 1 ♀; San Cristobal , Barrio El Lobo; Apr. 1984; B. Joffre leg.; CEMT  1 ♂, 4 ♀♀; Palo Gordo, nr San Cristobal , La Alameda Farm; 1000 m a.s.l.; Apr. 1987; D. Havranek leg.; CEMT  . – Vargas • 1 ♂, 1 ♀; Vargas , La Sabana ; 31 m a.s.l.; 10º35′46″ N, 66º16′50″ W; 22 Jul. 2009; P. Cely, M. Cordova and M. Nuñez leg.; CEMTGoogleMaps  . – Yaracuy • 1 ♂; Bolivar Aroa ; 1376 m a.s.l.; 10º0′0″ N, 68º0′0″ W; 20 Jul. 2009; M. Asmüssen, P. Colmenares and H. Martínez leg.; CEMTGoogleMaps  2 ♂♂, 1 ♀; Venezª [Venezuela]; BMNH  .

TRINIDAD • 2 ♂♂, 1 ♀; 1904; F. Birch leg.; BMNH  2 ♂♂; Antilles ; BMNH  1 ♂; Sta. Margarita ; May 1942; B.W.I.; BMNH  2 ♂♂; Sta. Margarita , Trinidad; Jun. 1942; B.W.I.; BMNH  1 ♂; 1953- 636; Humphries. B.M. ; BMNH  1 ♂; B.W.I. E.C. Humphries. B.M. ; BMNH 1953 -636  2 ♂♂; Sta. Margarita ; B.W.I.; Sep. 1942; E.C. Humphries. B. M; BMNH 1953-636. 

COUNTRY UNKNOWN • 1 ♂; No data; CEMT  2 ♂♂, 1 ♀; 1918-14; Nevinson leg.; BMNH  1 ♂, 1 ♀; Villa Paz; BMNH  2 ♂♂; Las Adjuntas ; 959 m a.s.l.; July 1926; H.E. Box leg.; BMNH  .

Redescription

Male

MEASUREMENTS. Length: 19.9 mm.

HEAD. Anterior dorsal surface rugose, extending posteriorly not reaching base of cephalic carina. Clypeus with central emargination separating two rounded clypeal teeth feebly curved dorsally. Cephalic carina higher than wide, anterior surface smooth. Median tubercle two and a half times as high as lateral tubercles, conical in shape, weakly curved posteriorly, apex rounded-truncated and never bifurcate. Apex of lateral tubercles obtuse ( Fig. 17CView Fig). Ventral clypeal process truncate (see Fig. 2BView Fig).

PRONOTUM. Wider than long. Anterior disc of pronotum presenting truncate declivity ( Fig. 17DView Fig). Row of organized ocellate punctures along anterior and posterior margins, few on lateral margins. Pronotal median disc with fine punctures. Hypomeral disc punctures separated by three times diameter of a puncture, never smooth or lacking punctation. External margin bearing single row of organized long setae, all approximately of same length (see Fig. 2FView Fig).

ABDOMEN. Mesosternum covered by large, ocellate setigerous punctures. Metepisternum surface shagreened microsculpture, displaying ocellate setigerous punctures. Metasternum setigerous punctures restricted mainly to lateral and anterior areas of mestasternal lobe, puncture diameter variable. Metasternal antero-median pilosity never connecting with lateral through margin of mesocoxa (see Fig. 2HView Fig). Ocellate punctures along anterior margin of each sternite. Pygidium sides of basal margin bearing row of ocellate punctures.

ELYTRA. Interstriae smooth with fine randomly distributed punctures. Striae strongly marked, with ocellate punctures separated by diameter of a puncture on elytral disc.

LEGS. Metacoxa posterior edge bearing row of organized ocellate punctures, separated by diameter of a puncture.

PARAMERES AND LAMELLA COPULATRIX. As in Fig. 17View Fig F–H.

Morphological variation

Females ( Fig. 17BView Fig)

As males except for the following characters:

HEAD. Completely transversely rugose, denser on anterior portion. Cephalic carina bituberculate. PRONOTUM. Surface covered by fine punctures, denser at antero-lateral edges, ocellate punctures of margins denser, distinct on lateral sides. Hypomeron setae longer and denser than in males.

Remarks

Dichotomius tristis  has historically been misidentified, as it is commonly confused with D. agenor  . The holotype that Luederwaldt (1923) used to describe the species was from Venezuela, lacking information on the specific locality. This species is known to occur in Colombia, Venezuela and Brazil below 1000 metres a.s.l., in the zones of Orinocoan piedmont, dry savannas or as stated by Morrone (2001), the provinces of Los Llanos Venezolanos and Roraima.

MZSP

Brazil, Sao Paulo, Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

BMNH

United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scarabaeidae

Genus

Dichotomius

Loc

Dichotomius (Luederwaldtinia) tristis ( Luederwaldt, 1923 )

Montoya-Molina, Santiago & Vaz-De, Fernando Z. 2021
2021
Loc

Dichotomius tristis

Roze J. A. 1955: 44
1955
Loc

Pinotus tristis

Blackwelder R. E. 1944: 208
1944
Loc

Pinotus tristis

Luederwaldt H. 1923: 12
1923