Derallus rudis Sharp, 1887

Short, Andrew Edward Z. & Torres, Phillip J., 2006, Review of the Hemiosus Sharp and Derallus Sharp of North America, Central America, and the Caribbean (Coleoptera: Hydrophilidae: Berosini), Zootaxa 1369, pp. 1-17: 14

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Derallus rudis Sharp, 1887


Derallus rudis Sharp, 1887 

( Figs. 8View FIGURES 6 – 9, 10View FIGURES 10 – 11)

Derallus rudis Sharp, 1887: 765  ; Oliva, 1982: 156 (lectotype designation).

Type material examined. Lectotype (male): “ Derallus  ru-/dis Type D.S./ Vera Cruz,/ Mex. Hoge”, “Sharp Coll./ 1095.- 313.”, “Vera Cruz,/ Mexico,/ Hoge”, “B.C.A. Col. I. 2. / Derallus  / rudis  ,/ Sharp.”, “ LECTOTYPUS ”, “Lecto-type [purple disc]” ( BMNH).

Additional material examined (94). MEXICO: Campeche: 21 mi. E of Campeche, 27.vii. 1964, P.J. Spangler leg. (44: USNM, AEZS); Haltunchen, 5.viii. 1964, P.J. Spangler, leg. (3: USNM); 19 mi. S Champoton, 26.vii. 1964, P.J. Spangler leg. (2: USNM); Jalisco: 15 mi. N Chapala, 2.viii. 1963, P.J. Spangler leg (2: USNM); Morelos: near Cuautla, 28.viii. 1962, J.R. Zimmerman leg. (4: USNM); Sinaloa: Mazatlan, 17–23.vii. 1963, P.J. Spangler leg. (2: USNM); Tabasco: Villahermosa, 6.viii. 1964, P.J. Spangler leg. (1: USNM); Villahermosa, 13 mi. SE, 1971, J.R. Zimmerman leg., 627 (4: USNM); Veracruz: 25 mi. S Acayucan, 4.vii. 1965, P.J. Spangler leg. (19: AEZS, USNM); Alvarado, 10.viii. 1964, P.J. Spangler leg. (5: AEZS, USNM); Alvarado, 6.viii. 1957, small pond, D. Lauck leg. (1: USNM); Near La Tinaja, 25.viii. 1962, J.R. Zimmerman leg., 406, (1: USNM); Paso del Toro, 15 km W, 8.ix. 1964, J.R. Zimmerman leg., 566 (2: USNM); Santiago Tuxtla, 10 km S, 8.ix. 1964, J.R. Zimmerman leg., 564 (1: USNM); Coatzocoalcosl, 15 km E, 26.viii. 1962, J.R. Zimmerman leg., 411 (2: USNM). GUATEMALA: Izabel, 2 km SW of Montufar, 15.vii. 2001, 360 ft., stream, W.D. Shepard leg. (1: AEZS). Representative material deposited in MALUZ, MIZA, MFPC and NMW.

Diagnosis. Total length: 2.3–3.4 mm. This species can be distinguished by two to three rows of ground punctures in interstria X, the two teeth of the mesoventrite projection being uneven in height, and the very diagnostic aedeagus, which has long lateral extensions of the basal piece and parameres which are quadrate at the apex.

Distribution. Cuba, Guadeloupe, Mexico, Guatemala (new record).

Remarks. This is the only species of the genus that does not also occur in continental South America. Oliva (1982) designated the lectotype and provided a redescription and illustration of the species. The larva and habitat were described by Spangler (1966).


Smithsonian Institution, National Museum of Natural History


Museo del Instituto de Zoologia Agricola Francisco Fernandez Yepez


Naturhistorisches Museum, Wien














Derallus rudis Sharp, 1887

Short, Andrew Edward Z. & Torres, Phillip J. 2006

Derallus rudis

Oliva 1982: 156
Sharp 1887: 765