Eleusis rufula SHARP, 1887

Irmler, Ulrich, 2017, The Neotropical species of the genus Eleusis LAPORTE, 1835 with description of the new genus Eleusima (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 67 (2), pp. 275-318 : 300-301

Eleusis rufula SHARP, 1887

Figs 22 A-C,31B

Eleusis rufula SHARP, 1887: 729

Type material examined: male, Lectotype: Panama: Bugaba, leg. Champion ( BMNH); Syntype : female, with same labels as lectotype ( BMNH) . Two syntypes are deposited in the BMNH. Although the female syntype was additionally labelled as type, I selected the male as lectotype.

Additional material examined: Nicaragua: Rio San Juan Dept., 60 km SE San Carlos, Refugio Bartola (10°5840'N, 84°20.30'W), 100 m elev., on bark, downed log, female, 25.5.2002, leg. R. Brooks, Z. Falin, S. Chatzimanolis #NIC1BFC02068 ( KNHM) ; Costa Rica: Heredia, La Selva Biol. Station nr. Puerto Viejo de Sarapiqui , 26 males, 20 females 18.2.1985, leg. L. Herman # 2117, #2112, #2118 (38 AMNH, 8 UIC) ; 10 males, 22 females, same location, same collector and date, but under log bark #2108 (26 AMNH, 6 UIC) ; F. La Selva , 3 km S Pto. Viejo (10°26'N, 84°01'W), male, 29.7.1976, leg. H.A. Hespenheide ( KNHM) ; same location, but 80 m elev., flight intercept trap, female, 18.- 20.6.2001, leg. S. Chatzimanolis CR1C01057 ( KNHM) ; Sto. Domingo del Heredia, INBio Cafetal , 1100 m elev., flight intercept trap, female, 25.- 28.6.1997, leg. S. & J. Peck #CR1P97027 ( KNHM) ; Puntarenas, Las Alturas Field Station , 20 km S San Vito de Hava, 1400 m elev., malaise trap, 20.- 24.5.1991, leg. DeVries ( AMNH) ; Las Alturas Biol. Sta. (8°56.17'N, 82°50.01'W), 1660 m elev., under bark, 6 males, 4 females, 1.6., 2.6.2004, leg. J.S. Ashe, Z. Falin, I. Hinojosa #CR1AFH04086, 071 (8 KNHM, 2 UIC) ; R.F. Golfo Dulce, 24 km W Piedras Blancas, 200 m elev., malaise trap, 1 male, 2 females, Oct. , Dec. 1990, leg. P. Hanson ( KNHM) ; Las Cruces Biol Sta. (8°47.14'N, 82°57.58'W), 1330 m elv., pyrethrum fogging fresh log, 1 male, 2 females, 30.5.2004, leg. J.S. Ashe, Z. Falin, I. Hinojosa #CR1AFH04050 ( KNHM) ; Corcovado National Park, Sirena Stn., upper Ollas Trail (8°29.7'N, 83°34.39'W), 140 m elev., flight intercept trap, 1 male, 1 female, 24.- 28.6.2000, leg. Z.H. Falin CR1ABF00036 ( KNHM) ; Rincon de Osa (8°41.14'N, 83°31.11'W), rain forest, stream side, 40 m elev., flight intercept trap, male, 23.- 26.6.2001, leg. S. & J. Peck #CR1P01007 ( KNHM) ; Guanacaste, Patilla Biological Station (10°59.22'N, 85°25.33'W), 610 m elev., on and under bark, female, 14.7.2000, leg. J. Ashe, R. Brooks, Z. Falin #CRI1ABF00128 ( KNHM) ; Cacao Biological Station (10°55.38'N, 85°27.7'W), 1050 m elev., under bark, female, 11.7.2000, leg. J. Ashe, R. Brooks, Z. Falin #CRI1ABF00098 ( KNHM) ; Alajuela, E.B. San Ramon , 27 km N & 8 km W San Ramon (10°13.4'N, 84°35.46'W), 810 m elev., under bark, 2 males, 4 females, 7.7.2000, leg. J. Ashe, R. Brooks, Z.Falin #CRI1ABF00072 (5 KNHM, 1 UIC) ; Peñas Blancas , 850 m elev., under bark, 1 male, 1 female, 18.5.1989, leg. J. Ashe, R. Brooks, R. Leschen #255 ( KNHM) ; same location, same collectors, barking, 19.5.1989, #294 ; Limon, 2 km W Puerto Viejo , 20 m elev., rotting cocoa pods, 15.5.1993, leg. J.S. & A.K. Ashe ( KNHM) ; Panama. Santa Fe, Piedra Alta (8°52'N, 81°13'W), dead wood, 17 females, 12 males, 26.4.2014, leg. T. Struyve (15 TSC, 14 UIC) ; Darién Prov., Mogué (8°247'N, 78°156'), litter layer, 2 females, 10.8.2014, leg. T. Struyve (1 TSC, 1 UIC) ; Cana Biological Station, Serrania de Pirre (7°45.28'N, 77°41.6'W), 1250 m elev., under bark, 2 males, 5 females, 4.6., 5.6.1996, leg. J. Ashe, R. Brooks #PAN1AB96041 (6 KNHM, 1 UIC) ; Coclé, 7.2 km Ne El Copé (8°42'N, 80°35'W), 730 m elev., female, 20.6.1995, leg. J. Ashe & R. Brooks #254 ( KNHM) ; Coclé Prov., La Mesa, N El Valle, 800 m elev., 1 male, 1 female, 23.8.1995, leg. A.R. Gillogly ( KNHM) ; Veraguas, Cerro Tule , 4 km W of Santa Fé, 850 m elev., 2 males, 30.7.1996, leg. A.R. Gillogly ( KNHM) ; French Guiana: Eaux Claires , 3.5 mi N Saül (3°38-40'N, 53°13- 14'W), 155-260 m elev., under bark of log, 5.- 13.10.1995, leg. L. Herman #2836 ( AMNH) ; Bolivia: Yuracaris , male ( IRSNB) .

Diagnosis: The species resembles E. bicolor and E. struyvei in shape and colouration. On average, it is smaller than these two species, in particular compared to E. struyvei . It can be separated from these species by the light reddish colour of the pronotum and the yellow abdomen. Colouration of the abdomen of E. bicolor , however, is varying in the teneral stages. Therefore, black last abdominal segments can be also absent in E. bicolor . The microsculpture of the head of E. rufula is denser than in E. bicolor . It resembles that of E. struyvei . Thus, the surface of the head in E. bicolor is shinier than in E. rufula . The aedeagus is extremely similar to that of E. bicolor , but the number of sensillae in E. bicolor seems to be higher than in E. rufula .

Description: Length: 3.7 – 4.7 mm. Colouration: head dark brown to blackish; pronotum red; elytra orange-red with posterior half blackish; abdomen red to orange with central stripe dark brownish; legs dark yellow; antennae brown.

Head: 0.68 mm long, 0.63 mm wide; eyes not prominent; temples parallel; approximately twice as long as eyes; preocular sides parallel; anterior margin of clypeus narrowed to prominent centre; central part triangularly emarginate; supraocular groove reaching from anterior edge of eyes to posterior edge of temples; punctation irregularly dense and deep; clypeus and posterior vertex finer and sparser punctate than interocular area; setiferous puncture at each end of supraocular groove; another pair of setiferous punctures on each side of central clypeal prominence; elongate microsculpture dense; longitudinally striate; surface moderately matt.

Antennae as long as head and half of pronotum combined; first antennomere thicker and longer than following antennomeres; second antennomere half as long as first antennomere; third antennomere slightly longer than second; following antennomeres decreasing in length and increasing in width; fourth antennomere slightly longer than wide; tenth antennomere slightly wider than long; antennomeres four to eleven pubescent and with long apical setae.

Pronotum: 0.61 mm long, 0.63 mm wide; sides of anterior half parallel; sides of posterior half strongly narrowed to posterior angles; posterior margin less than half as wide as anterior margin; punctation as dense as on posterior vertex; short groove at anterior angles; pair of short grooves in posterior half; margined by ridges; on average, interstices between punctures three to four times as wide as diameter of punctures; setiferous punctures in groove at anterior angles, at anterior margin on each side of middle close to anterior angles, and along lateral margin; weak elongate microsculpture; longitudinally striate on disc; close to lateral margin, partly diagonally striate; surface shinier than head.

Elytra: 0.77 mm long, 0.74 mm wide, sides slightly divergent to posterior angles; humeral angles and posterior angles obtusely angled; weak punctation as dense as on pronotum; weak elongate microsculpture longitudinally striate; on each side of suture, one setiferous puncture in central position; few more setiferous punctures along lateral margin; weak elongate microsculpture longitudinally striate; surface shiny.

Abdomen impunctate except few setiferous punctures in transverse row on each abdominal segment; weak elongate microsculpture transversely striate, surface shiny.

Aedeagus in lateral aspect broadly curved; apex broadly rounded; at apex with small sclerotised plate; large sclerotised plate of central lobe with few sensillae at base; in ventral aspect, central lobe broadly parallel; with pincerlike sclerotised structure at apex; paramere approximately as long as central lobe; at apex with wide transparent lobe; several sensillae on transparent lobe.

Figures

Fig. 18–23: Eleusis platysoma (18), E. bicolor (19), E. struyvei (20), E. fenestrata (21), E. rufula (22), E. adusta (23): aedeagus in lateral (A) and ventral (B) view, antenna (C), head (D), colouration of elytra (E); scale bar A, B: 0.1 mm, C: 0.2 mm, D, E: 1.0 mm.