Eleusis struyvei, Irmler, 2017

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 : 301-302

Eleusis struyvei spec. nov.

urn:lsid:zoobank.org:act:0BB5EBEE-6C8F-49D9-9D90-7178E660227F

Figs 20 A-C, 30F,31E,35d

Type material: male, Holotype: Panama: Chiriqui Prov., Cerro Punta, Mont Baru (8.846°, -82.536°), dead wood, 1.5.2014, leg. T. Struyve ( UIC) . Paratypes: Mexico: Chiapas, Volcan Tacana, Sumidero, San Antonio , leaf litter beside Rio Mala , 1760 m elev., male, 20.12.1976, leg. H. Frania, D. Proctor ( AMNH) ; Chiapas, Union Juarez, NE slope of Vulcan Tacaná, 1760 m elev., Sumidero San Antonio , male, 17.12.1975, leg. H. Frania ( AMNH) ; Guatemala: Dpto. San Marcos, between Sivinal & Union Juarez (Chiapas) w. slope Volcan Tacana , Barranca Rio Lu Laja , under bark, fresh cut log, 2100 m elev., 2 males, 31.12.1976, leg. H. Frania, D. Proctor ( AMNH) ; San Marcos, Parque Municipal Refugio del Quetzal (14.9391°, -91.8729°), 1800–1830 m elev., under fermenting bark, female, 4.6.2015, leg. ZH Falin #GUAT1F15006 ( KNHM) ; Baja Verapaz, 4 km S Purulha , 1650 m elev., under bark, 1 male, 1 female, 2.7.1993, J.S. Ashe, R. Brooks #181 ( KNHM) ; Costa Rica: San José Prov., Genesis II Reserve (9°42.57'N, 83°54.64'W), 2360 m elev., under bark, 4 males, 1 female, 13.6., 14.6.2004, leg. J.S. Ashe, R.Z. Falin, I. Hinojosa, #CR1AFH04232 (3 KNHM, 2 UIC) ; PanAmerican Hwy, km 80.5, 7 km SSW, Cabinas de Quetzal (9°33.53'N, 83°48.5'W), 2150 m elev. under bark, male, 22.7.2000, leg. J. Ashe, R. Brooks, Z. Falin #CR1ABF00218 ( KNHM) ; PanAmerican Hwy, km 80.5, 9 km SSW Albergue de Montana Savegre, Upper Quebrada –Las Robles Trails (9°32.56'N, 83°48.9'W), 2200-2300 m elev., under bark, female, 23.7.2000, leg. J. Ashe, R. Brooks, Z. Falin #CR1ABF00234 ( KNHM) ; Vara Blanca , 2000 m elev., 1 male, 1 female, 8.1938, leg. R. Brooks ( BMNH) ; Panama: 2 males, 2 females, with same data as holotype (2 UIC, 2 TSC) ; Chiriqui Prov., P. Armistad, Las Nubles continental divide, 2000 m elev., 1 male, 1 female, 13.7.1995, leg. R. Gillogly ( KNHM) ; 2 males, 2 females, same data as holotype (2 TSC, 2 UIC) ; Venezuela: without more data from coll. Chevrolat ( BMNH) .

Diagnosis: The species is extremely similar to E. bicolor . On average, E. struyvei is larger. Mean length (without abdomen) is 4.6. ± 0.8 mm, whereas mean length in E. bicolor is 3.9 ± 0.6 (significant t-test: t=3.7, n=21/32, p<0.001). However, size overlapping specimens exist ( Fig. 34d ). It can be clearly differentiated from E. bicolor by the more elongate aedeagus. As colouration in both species seems to vary extremely, colouration cannot be used to differentiate the species. Mostly, the anterior abdominal segments are clear yellow in E. bicolor , whereas a brown central stripe exists in E. struyvei . The elongate microsculpture of the head is denser in E. struyvei than in E. bicolor . In E. bicolor the ridges between the micro-striae are shinier. Thus, the surface of the head seems to be shinier than in E. struyvei .

Description: Length: 5.6 – 9.4 mm. Colouration: extremely varying; head and pronotum black; elytra yellow with posterior third dark brown to blackish or totally blackish; abdominal segments yellowish with central part brown, except posterior two segments totally dark brown or totally yellowish; legs brownish; tarsi yellow; antennae dark brown.

Head: on average, 1.33 mm long, 1.44 mm wide; no sexual dimorphism in head size; length of temples varying between as long as and more than twice as long as eyes; preocular sides shortly parallel; narrowed to anterior margin of clypeus in sinuate curve; central part of anterior margin prominent; slightly emarginate; supraocular groove from anterior edge of eyes to posterior angles; punctation irregularly dense and deep; between eyes triangular area with deep and coarse punctures; clypeus and posterior vertex with sparser and weaker punctures; at each end of supraocular groove with setiferous puncture; pair of setiferous punctures on each side of central prominence; elongate microsculpture dense; longitudinally striate; surface moderately matt.

Antennae as long as head and half of pronotum combined; first antennomere longer and slightly thicker than following antennomeres; three times as long as

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.

Fig. 34: Head and pronotum of E. scita showing variance of head shape; scale bar: 0.5 mm.