Eleusis interrupta ( ERICHSON, 1840 )

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 : 285-286

Eleusis interrupta ( ERICHSON, 1840)

Figs 2 A-C, 28F,35a

Isomalus interruptus ERICHSON, 1840: 839

Isomalus pallidipennis FAUVEL, 1864: 40 new synonymy

Eleusis corvina SHARP, 1887: 730 new synonymy

Eleusis flavipennis SHARP, 1887: 731 new synonymy

Eleusis darlingtoni BLACKWELDER, 1943: 156 new synonymy

Piestus interruptus ( ERICHSON, 1840) – SCHEERPELTZ 1933: 994

Type material examined: female, Holotype: Columbia: Carthagena ( ZMUH); lectotype of I. pallidipennis , male: Mexico: Teapa, Campeche ( IRSNB); syntypes 1 male, 1 female, Teapa, leg. Pilate, coll. Chevrolat ( BMNH); syntype, female, trouves chauves tabacs ( IRSNB); syntype, female, Venezuela: Caracas ( IRSNB) (with additional labels: fasciata Lee, pallidipennis Fvl. , indica Kr. ); Three syntypes of E. pallidipennis are deposited in IRSNB, two specimens in BMNH. The male syntype of IRSNB was selected as lectotype for E. pallidipennis . Female, lectoptype of E. corvina : Guatemala: Verapaz, Sinahu, leg. Champion ( BMNH), female syntype with same data as lectotype. The two female syntypes are deposited in BMNH. The specimen with an additional “type” label was selected as lectotype; Cuba: male holotype of E. darlingtoni BLACKWELDER, 1942 , Soledad, leg. Darlington ( MCZ).

Additional material examined: Mexico: Plan del Rio , without more date ( IRSNB) ; Guatemala: Senahu , female, coll. Münchemeyer without more data ( NMW) ; Petén, Parque National Ixpanpajul (-89.81834, 16.87380), under tight fresh bark, 160-300 m elev., 4 males, 4 females, 24.11.2016, leg. Z.H. Falin #GUAT1F16085 (6 NHMK, 2 UIC) ; same location, same collector, on/ under fresh bark, 160 m elev. 2 females, 24.11.2016, #GUAT1 F16701 ( NHMK) ; same location, same collector, (-89.81512, 16.87341), under fresh bark, 160 m elev., 7 males, 5 females, #GUAT1F16074 (10 KNHM, 2 UIC) ; Honduras: Francisco Morazán, Zamorano (14°N, 87°W), 820 m elev., rotting bread fruit, male, 30.6.1994, leg. Ashe & Brooks, #258 ( KNHM) ; Santa Barbara, La Fe, Finca La Roca, 5.3 km S. Peña Bianca (14°57'N, 80°02'W), 740 m elev., under bark, female, 21.6.1994, leg. Brooks & Ashe, #176 ( KNHM) ; Nicaragua: Granada Dept., Reserva National Volcan Mombacho , entrance (11°50.5'N, 86°00.74'W), 375 m elev., under fermenting guanacaste limber, 4 males, 5 females, 1.6.2002, 4.6.2002, leg. R. Brooks, Z. Falin & S. Chatzimanolis, #NIC1BFC02137 (7 KNHM, 2 UIC) ; Costa Rica: Heredia, 3 km S Puerto Viejo , OTS La Selva, 100 m elev., male, Sept. 1992, leg. P. Hanson ( KNHM) ; Heredia, La Selva, 3.2 km SE Puerto Viejo , 100 m elev., light intercept trap, female, 3.2.1992, leg. W. Bell ( KNHM) ; San Isidro de General , 700-800 m elev., Aug, 1980, leg. N.L.H. Kraus ( AMNH) ; Ciudad Neily, above, Rd. Ciudad Neily> San Vito (8°39'- 42'N, 82°56'W), 100-1000 m elev., car net, 16:15–16:46, devastated forest & plantation, 8.12.2012, leg. Schülke & Grünberg ( MSC) ; Panama: Prov. Miramar (8.95N, 82.19W), car net, 1 male, 5 females, 30.7.2014, leg. T. Struyve (3 TSC, 3 UIC) ; 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, 2 females, 5.- 13.10.1995, leg. L. Herman # 2836 ( AMNH) .

Diagnosis: On average, slightly larger and darker than E. fauveli . The species also extremely resembles E. humilis . It can be separated from these two species only by the dissection of the aedeagus. On average, E. interrupta is slightly larger than E. humilis . But, size range of both species are overlapping. The aedeagus of E. interrupta is ticker and with an obtuse apex and not slender with approximately acute apex as in the other species of the E. humilis-group.

Description: Length: 2.8 – 3.1 mm. Colouration: dark, nearly black, elytra yellow with dark spot at scutellum and wide transverse stripe at posterior margin; legs light brown; two basal antennomeres yellow; antennomeres three to eleven brown to black.

Head: 0.45 mm long, 0.47 mm wide; eyes not prominent; as long as temples; on average, EL:HL-ratio = 0.29; postocular space shortly parallel; posteriad continuously narrowed to distinct neck; preocular sides shortly parallel to base of antennae; clypeus with slightly sinuate anterior margin; at each end of supraocular groove with yellow seta; nearly twice as long as eyes; punctation moderately deep and irregularly sparse; interstices between punctures as wide as to four times as wide as diameter of punctures; microsculpture distinct; on clypeus with transverse, on vertex with longitudinal, slightly curved striae.

Antennae as long as head and pronotum combined; first antennomere thicker and slightly longer than second; following antennomeres decreasing in length; second and third antennomeres twice as long as wide; following antennomeres approximately quadrate; antennomeres four to eleven pubescent; all antennomeres with short apical setae.

Pronotum: 0.38 mm long, 0.46 mm wide; widest close to anterior angles; anterior angles smoothly curved; evenly narrowed to posterior angles; in dorsal aspect, lateral margin not visible; anterior margin slightly sinuate; 1.5 times as wide as posterior margin; punctation moderately deep and irregularly sparse; close to anterior angles with three large setiferous punctures; along lateral margin with several large setiferous punctures; lateral margin interrupted in posterior half; interruption marked by deep setiferous puncture; microsculpture distinct; transverse close to anterior margin; longitudinal on disc; laterad close to anterior angles circular; surface moderately shiny.

Elytra: 0.57 mm long, 0.53 mm wide; widest close to posterior angles; sides slightly convergent to humeral angles; humeral angles smoothly rounded; punctation finer and denser than on pronotum; on average, interstices between punctures slightly wider than diameter of punctures; microsculpture distinct; striae elongate; diagonal from humeral angles to posterior end of suture; along lateral and posterior margin large setiferous punctures; setae yellow.

Abdomen sparsely punctate; each segment with several larger setiferous punctures; long setae yellow; setae partly as long as length of segment; microsculpture finer than on pronotum; transverse.

Aedeagus wide, thick; apex obtuse; at central midline with short triangular prominence; at prominence with several sensillae; adjacent to prominence several sensillae; apical margin thicker; angles rounded, slightly prominent; with transverse row of sensillae; parameres slightly shorter than central lobe; widened at apex and with transparent lobe; transparent lobe with minute sensillae and row of setae.

Figures

Fig. 2–6: Eleusis interrupta (2), E.humilis (3), E. nigerrima (4), E. boliviana (5), E. andina (6); aedeagus in lateral (A) and ventral (B)