Dilychnia ruficollis, MOTSCHULSKY, 1853

DILYCHNIA RUFICOLLIS MOTSCHULSKY, 1853 View in CoL

( FIGS 12, 26)

Dilychnia ruficollis Motschulsky, 1854: 7 View in CoL (desc.); Lacordaire, 1857: 319.

Lucidota ruficollis View in CoL ; Gemminger & Harold, 1869: 1640; Olivier in Wytsman, 1907: 21 McDermott, 1966: 69 (cat.).

Typical material: male ( ZMMU, Zoological Museum of Moscow State University) ( Fig. 26A). Labels: Dilychnia ruficollis Motsch. [green label]; Amazones [light brown label]; Comparé au Type (Mus. Petersb. Par Ern. Olivier] [light brown label] ( Fig. 26B). Note that we could not examine the type material of D. ruficollis at ZMMU, but we had access to specimens that were previously compared with the type by E. Olivier at MNHN.

Diagnosis: Males with antennomere III as long as scape, antennomeres III –IX serrate, X and XI filiform ( Fig. 12A), sterna VI and VII with elliptical light organs in central region, covering one-third of width of sternum ( Fig. 12C); sternum VIII with lateral margin convergent posteriorly ( Fig. 12E); pygidium with lateral margin and posterior margin with median region rounded ( Fig. 12D); aedeagus with phallobase short and blunt, with median region strongly emarginate ( Fig. 12G–I).

Colour pattern: Frons and antenna dark brown, mouthparts brown ( Fig. 12C); pronotum orangish brown and median region and posterior margin orange ( Fig. 12A); scutellum orange ( Fig. 12A); elytra black ( Fig. 12A); thorax orangish brown; pro-, meso- and metafemur orange–brown; and tibia and tarsus black ( Fig. 12B, C); abdomen dark brown to black and sternum VIII light brown ( Fig. 12C).

Head: Antenna slightly serrate, covered with short bristles ( Fig. 12B). Palpi four-segmented: I small and thin compared with II; II 2× longer than III, cylindrical; III rectangular; and IV robust and medially fusiform, 1.5× longer than I. Labium with palpi three-segmented: I and II subequal; III securiform, 3× longer than maxillary palpomere IV.

Thorax: Pronotum semicircular with anterior margin slightly projected, 2× wider than long, lateral margin rounded, posterior margin with median region rounded and projected posterior angles, acute and convergent posteriad ( Fig. 12A). Hypomeron trapezoidal, protruded outwards laterally ( Fig. 12B). Elytron slightly convex, with lateral margin subparallel and apex rounded ( Fig. 12A).

Abdomen: Sterna with lateral margins divergent posteriad ( Fig. 12C); sterna VI and VII median region with elliptical light organ ( Fig.12C); sternum VIII slightly wider than long and with lateral margin convergent posteriad ( Fig. 12E); pygidium slightly wider than long, posterior margin with median region rounded ( Fig. 12D); sternum IX with posterior margin rounded ( Fig. 12F).

Aedeagus: Phallobase with lateral margin sinuose and posterior margin strongly emarginate ( Fig. 12G); parameres apically acute and sclerotized, posterior margin mucronate ( Fig. 12H); phallus with basal part extending abruptly towards phallobase ( Fig. 12I).

Female: Pronotum 2.5× wider than long; sternum VI with circular light organ; sternum VII lacking light organs; sternum VIII with lateral margins slightly converging posteriad and posterior margin with median region emarginate; pygidium posterior margin with parasagittal sinuosities, posterior angles straight, and a rounded median region.

Remarks: This species can be distinguished from others by its colour pattern (pronotum dark orange and elytron black ( Fig. 12A), serrate antennomeres III – VII, filiform antennomeres VIII –XI ( Fig. 12B, C), a pronotum with projected posterior angles ( Fig. 12A), male aedeagus phallobase blunt, with short lateral margin and strongly emarginate posterior margin ( Fig. 12G–I). Dilychnia ruficollis is similar to D. guttula , and it occurs around the upper Amazonas river region.

In the same paper in which de Motschulsky (1854) described the genus Dilychnia and its type species D. basalis , he also described D. ruficollis . Gemminger & Harold (1869) synonymized Dilychnia with Lucidota and used Lucidota ruficollis for the first time. After that, Gemminger (1870) revalidated the genus Dilychnia , although Olivier in Wytsman (1907) synonymized both genera, using Lucidota ruficollis . When Olivier (1911) accepted Dilychnia , he did not provide a checklist of the genus, and McDermott (1966) thus listed the species under Lucidota .

Material examined: COLOMBIA: Putumayo: Mocoa, Jardin Botânico tropical amazônico, 01°7 ′ 82 ″ N, 76°37 ′ 53,6 ″ W, 1 female , 22. III .2015 , J. Garcia, busca ativo ( INPA). BRAZIL: Amapá: Pôrto Platon , 1 female , 24. VII .1961 , J. & B. Bechyné ( MPEG), Reginá , 1 male, 07.IX.1961, J. & B. Bechyné ( MPEG), Rio Caciporé , 1 female , 09.IX.1961, J. & B. Bechyné ( MPEG), Rio Felício , 1 male , 08. VIII .1959 , J. Lane ( MZSP), Serra Lombard, Limão , 1 male, 03.IX.1961, J. & B. Bechyné ( MPEG), Serra Navio , 1 female , 26.ix.1957, J. Lane ( MZSP), 1 female , IX.1959, Bicelli ( MZSP), 2 female , X.1957, J. Lane ( MZSP) ; Amazonas: Barcelos, Igarapé Erere / Coruja, 00°06 ′ 16 ″ N, 63°51 ′ 01 ″ W, 1 male GoogleMaps , 18–25. VI .2008 , F. F. Xavier-Filho, Malaise ( INPA), Benjamin Constant, Rio Javari , 1 male, XI.1961, Dirings ( MZSP); Benjamin Constant, Rio Javari , 1 female, VI .1961, Dirings ( MZSP); Itacoatiara , 1 male, VII .1959, Dirings ( MZSP), 1 male , XI.1960, Dirings ( MZSP), 1 female, 2 male , XII.1961, Dirings ( MZSP), BR 174 , km 115, 2 female, 16.XI.1977, Norman D. Penny ( INPA); Óbidos, Baixo Amazonas , 1 male, II .1960, Dirings ( MZSP), Óbidos, Colônia Rio Branco , 1 female , 27–31.XII.1952, Pedro Almeida Teles ( MNRJ), Querari, São Gabriel da Cachoeira 01°05 ′ N, 69°51 ′ W, 1 female, V GoogleMaps .1993, J. Vidal; R . L. M. Ferreira, Malaise ( INPA), S. Izabel, Rio Negro, Maturaca , 1 male , 11–18.X.1990, J. A. Rafael, Malaise ( INPA), Taracuá, Rio Uaupés , 1 female, VIII .1964, Pereira & Machado ( MZSP) Pará: Mocajuba, 1 male, V .1953, Orlando Rego ( MNRJ) .