Omorgus (Omorgus) loxus ( Vaurie, 1955 )

Costa-Silva, Vinícius, Strümpher, Werner P. & Vaz-de-Mello, Fernando Z., 2021, Review of the Brazilian species of Omorgus Erichson, 1847 (Coleoptera: Trogidae: Omorginae), Journal of Natural History 54 (31 - 32), pp. 1993-2024 : 1999-2001

Omorgus (Omorgus) loxus ( Vaurie, 1955)

( Figure 2 a-c, 9)

Trox loxus Vaurie, 1955: 58 (original description); Vaurie 1962: 147 (redescription); Ratcliffe 1978: 301 (new distribution records). Trox (Omorgus) loxus: Scholtz 1982: 11 (catalogue). Omorgus (Omorgus) loxus: Scholtz 1986: 361 (phylogenetics); Scholtz 1990: 1416 (redescription), Moragues 2010: 77 (checklist); Zídek 2013: 12 (catalogue); Zídek 2017: 103 (catalogue); Hielkema and Hielkema 2019: 11 (checklist of the Guianas).

Type material examined

Holotype: (♀, MCZC, through photographs, Figure 2 a-c): First label [white]: ‘ ♀ ’. Second label [white, typeset]: ‘El Palmar, 16 k.W./Tetzonapa Ver., MEX /VI-9 / 15-1948 600 ʹ /jungle, rubber, coff. Third label’ [white, typeset]: ‘W. Nutting/F. Werner’. Fourth label [white, typeset]: ‘Museum of/Comparative/Zoology’. Fifth label [red, typeset]: ‘ HOLOTYPE / TROX LOXUS /VAURIE’. Sixth label [red, typeset and handwritten]: ‘M.C.Z./Type/32,291 [handwritten]’. Seventh label [white label, typeset]: ‘ Omorgus loxus /(Vaurie)/det. Scholtz 1988 ’. Eighth label [white, handwritten in blue]: ‘loxus’. Type locality: MEXICO: Veracruz, El Palmar.

Additional material examined

FRENCH GUIANA: Maripasoula, Mitaraka, Crique Alassa, Tumuc-Humac , 300–600 m [meters above sea level], 2º14 ʹ 10”N, 54º27 ʹ 38”W, 21 .iii .2015, J . Touroult leg . (2 ♂ CJBH) . BRAZIL: Pará, Jacareacanga, x .1959, M . Alvarenga leg . (1 CEMT). Tocantins, Porto Nacional , 10°31’S 48°17 ʹ W, 7 .xi .2015, light trap, A . Specht leg . (1 CEMT). Mato Grosso, Parque Nacional Xingu, xi.1961, Alvarenga & Werner leg. (1 DZUP). Mato Grosso do Sul, Selvíria, UNESP Farm (=São Paulo State University ‘ Júlio de Mesquita Filho’ ), 24 .x .1996, black light trap, C .A .H. Flechtmann leg. (1 CEMT). Goiás, Niquelândia, x.1994, no collector (1 CVMD). Minas Gerais, Nova Era, x.1987, no collector (1 CEMT). Espírito Santo, Linhares, RFCVRD [ Reserva Florestal Companhia Vale do Rio Doce ], xi .1988, J .S . Santos leg (1 ♂ CEMT and 1 CVMD); Linhares , RFCVRD [Reserva Florestal Companhia Vale do Rio Doce], 11 . xii .1992, J .S . Santos leg . (1 ♂ CEMT); Linhares , RFCVRD [Reserva Florestal Companhia Vale do Rio Doce], 30 .x .1990, J .S . Santos leg . (1 CEMT); Linhares , RFCVRD [Reserva Florestal Companhia Vale do Rio Doce], i .1989, J .S . Santos leg . (1 ♀ CEMT) . São Paulo, Ribeirão Preto, Faculdade de Medicina , xi .1954, Baretto leg . (1 CEMT); Marília , xi .1945, J . Guérin leg . (1 SAMC). Paraná, Céu Azul, Parque Nacional do IguaÇu , 655 m, 25°09’S 53°50 ʹ W, 9 .xi .2015, light trap, R . Barros leg . (1 ♀ CEMT) . Santa Catarina, Corupá (‘Hansa’), xi .1943 (1 CEMT); Corupá , xii.1953, A . Maller leg . (1 DZUP); Itapiranga , i .1958 (1 MGAP). PARAGUAY: San Pedro, Cororó, xii . 1983, M . Viana leg . (1 CVMD). ARGENTINA: Missiones, Iguazú, xii .1957, A . Martinez leg . (1 CEMT). Salta, Rosário de Lerma , xi .1982, M . Viana leg . (1 CVMD); Corralito , ii .1983, M . Viana leg . (1 CVMD). Tucuman, no specific locality, xi–xii.1944, R . Golbach leg . (1 IFML). Santiago del Estero, Los Tigres, 11–16 .i .1970, R . Golbach leg . (1 IFML). Mendoza, Santa Rosa, Reserva de Biosfera de Ñacuñan , 11–13 .xii .2002, V .M . Diéguez leg . (2 ♂ CVMD); Santa Rosa, Reserva de Biosfera de Ñacuñan , 11–13 .xii .2002, UV light trap, V . Manuel Diéguez leg . (1 IADIZA). San Luis, San Gerónimo, 15–25 .ii .2007, José Gomez leg . (1 ♀ CVMD) .

Diagnosis

Omorgus loxus is similar in appearance to O. badeni and O. borrei . These three species may be separated by the differences on the elytra. Omorgus loxus have distinct pilose tubercles, whereas O. borrei have glabrous black tubercles and O. badeni have black lustrous patches. Furthermore, O. loxus have the outer margin of the mesotibiae smooth, whereas the other two species have it serrate. For a more detailed treatment of the species, see Vaurie (1962) and Scholtz (1990).

Geographic distribution

Omorgus loxus occurs in southeastern Mexico, Central America and parts of South America (French Guiana, Colombia, Argentina, Brazil and Paraguay). It is thought to have a continuous distribution throughout its range. In Brazil, it has recorded in the Cerrado (GO, MG, MS and TO) and Atlantic Forest (ES, SC, SP) biomes ( Figure 9 ). For a more detailed discussion on the distribution of this species see Vaurie (1955, 1962)), Scholtz (1990) and Hielkema and Hielkema (2019).

Figures

Figure 2. Holotype of Trox loxus Vaurie, 1955 (now Omorgus loxus). A, dorsal view; B, lateral view and C, holotype labels (Photos by Rachel Hawkins, copyright MCZC).

Figure 9. Distribution of Omorgus borrei, O. badeni and O. loxus in the Brazilian territory. Green triangle with small black point inside refers to approximate type locality of O. badeni (‘Ceará’).