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<I>Hybosorus Illigeri</I> University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Papers in Entomology Museum, University of Nebraska State May 2002 Hybosorids of the United States and Expanding Distribution of the Introduced Species Hybosorus illigeri (Coleoptera: Scarabaeoidea: Hybosoridae) Federico C. Ocampo University of Nebraska - Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/entomologypapers Part of the Entomology Commons Ocampo, Federico C., "Hybosorids of the United States and Expanding Distribution of the Introduced Species Hybosorus illigeri (Coleoptera: Scarabaeoidea: Hybosoridae)" (2002). Papers in Entomology. 123. https://digitalcommons.unl.edu/entomologypapers/123 This Article is brought to you for free and open access by the Museum, University of Nebraska State at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Papers in Entomology by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. SYSTEMATICS Hybosorids of the United States and Expanding Distribution of the Introduced Species Hybosorus illigeri (Coleoptera: Scarabaeoidea: Hybosoridae) F. C. OCAMPO1 Systematics Research Collections, University of Nebraska State Museum, W 436 Nebraska Hall, Lincoln, NE 68588Ð0546 Ann. Entomol. Soc. Am. 95(3): 316Ð322 (2002) ABSTRACT Two species of Hybosoridae, Hybosorus illigeri Reiche and Pachyplectrus laevis Le- Conte, are distributed in the United States. For the introduced species H. illigeri, three new country records are reported (Dominican Republic, Nicaragua, and Venezuela); six new state records are recorded in the United States (Arkansas, Arizona, Kansas, Missouri, New Mexico, and Virginia); and 10 new state records are reported in Mexico (Baja California Sur, Chiapas, Michoaca´n, Nuevo Leo´n, Sinaloa, Sonora, Tamaulipas, Veracruz, Quere´taro, and Yucata´n). Information on the predatory habits of H. illigeri and a report as a turfgrass pest in the state of Arizona are provided. Pachyplectrus laevis is redescribed, and information on its biology and distribution is provided. A key to the species is provided along with diagnostic illustrations. RESUMEN Dos especies de Hybosoridae, Hybosorus illigeri Reiche y Pachyplectrus laevis LeConte se distribuyen en los Estados Unidos. Se reporta para la especie introducida, Hybosorus illigeri, nuevos registros en tres paises (Repu´ blica Dominicana, Nicaragua y Venezuela); seis nuevos registros en estados de los Estados Unidos (Arkansas, Arizona, Kansas, Missouri, New Mexico, y Virginia); y diez nuevos registros en estados de Mexico (Baja California Sur, Chiapas, Michoaca´n, Nuevo Leo´n, Sinaloa, Sonora, Tamaulipas, Veracruz, Quere´taro y Yucata´n). Se provee informacio´n sobre los ha´bitos predadores de Hybosorus illigeri. Pachyplectrus laevis es redescripta y se provee informacio´n sobre su biologõ´a y distribucio´n. Se provee una clave para las especies junto con ilustraciones para su diagnosis. KEY WORDS Scarabaeoidea, Hybosoridae, Hybosorus, Pachyplectrus, New World, introduced spe- cies THE HYBOSORIDAE IS a small family within Scarabae- Pachyplectrus is a monotypic genus endemic to the oidea, that includes 32 genera and Ϸ210 species southwest United States. Pachyplectrus laevis is rede- (Ocampo 2000). It is a cosmopolitan family that is best scribed because the original description, as with many represented in the tropics. In adults, diagnostic char- old descriptions, lacks the necessary details for correct acters are the prominent mandibles and labrum and identiÞcation of the species. Hybosorus illigeri was the 9- or 10-segmented antennae with the Þrst seg- introduced on the East Coast of the United States ment of the club usually hollowed to receive segments about 200 yr ago. In this article I report the expanding 2 and 3 (Fig. 1). Little is known about the biology of distribution of H. illigeri in the New World and discuss members of this family. Larvae of hybosorids are dis- its predatory habits. tinguished from other scarabs by the presence of stridulatory structures on both prothoracic and me- Materials and Methods sothoracic legs, and the presence of three truncate lobes on the anterior margin of the labrum (Ritcher The results of this study were based on specimens 1966, Woodruff 1973). Larvae stridulate by rubbing from the following institutions, curators, and collec- the front legs against the anterior margin of the tions. The collections and their acronyms are as fol- epipharynx, a trait unique to the Hybosoridae (Paulian lows: AMNH, American Museum of Natural History, 1939). Two genera and two species of hybosorids oc- New York, NY (Lee Herman, Jr.); CASC, California cur in the United States and Northern Mexico: Hy- Academy of Sciences, San Francisco, CA (D. Ka- bosorus illigeri Reiche and Pachyplectrus laevis Le- vanaugh, R. Brett); CMNC: Canadian Museum of Na- Conte. ture, Ottawa, Canada (R. S. Anderson, F. Ge´nier); CMNH; Carnegie Museum of Natural History, Pitts- 1 E-mail: [email protected]. burgh, PA (J. Rawlins, R. Davidson); EMEC, Essig 0013-8746/02/0316Ð0322$02.00/0 ᭧ 2002 Entomological Society of America May 2002 OCAMPO:HYBOSORIDS OF THE UNITED STATES 317 Hybosorus oblongus Dahlbom (nomen oblitum). Hybosorus pinguis Westwood 1845: 159 (nomen obli- tum). Hybosorus roei Westwood 1845: 159 (nomen oblitum). Hybosorus thoracicus Westwood 1845: 159 (nomen oblitum). Hybosorus carolinus LeConte 1847: 84 (nomen obli- tum). Hybosorus illigeri Reiche 1853: 87. Hybosorus nitidus Lansberge1882: 21. Hybosorus illigeri variety nossibianus Fairmaire 1895: 17. Hybosorus illigeri Reiche subsp. palearcticus Endro¨di 1957: 46. Diagnosis. This species is distinguished from other species of Hybosoridae from the New World by the following combination of characters: color dark red- dish-brown; length 7.0Ð9.0 mm; antenna 10-seg- Fig. 1. Hybosorid typical antennal shape. mented with 3-segmented club, Þrst segment hol- lowed to receive segments 2 and 3; frontoclypeal Museum of Entomology, University of California, suture not visible; labrum protruding beyond clypeus, Berkeley, CA (C. Barr); FMNH, Field Museum of anterior margin with 7Ð11 teeth; meso- and metatibiae Natural History, Chicago, IL (A. Newton); FSCA, with well-developed transverse ridge; parameres as in Florida State Collection of Arthropods, Gainesville, Figs. 4Ð6. An extensive redescription of the species FL (B. Beck, M. Thomas); HAHC, Henry and Anne was provided by Kuijten (1983). Howden Collection, Ottawa, Canada (H. Howden); Distribution (Fig. 9). Hybosorus illigeri was prob- SEMC, Snow Entomological Museum, Lawrence, KS ably introduced to the east coast of the United States (S. Ashe, R. Brooks); TAMU, TexasA&MUniversity, during the early 19th century (LeConte 1847). There College Station, TX (e.g., Riley); UMRM, W. R. Enns are two prevailing hypotheses regarding the introduc- Entomology Museum, University of Missouri, Colum- tion of H. illigeri to the United States. Paulian (1944) bia, MO (R. Sites); CNCI, Canadian National Collec- suggested that the species probably arrived via slave tion of Insects, Ottawa, Canada (A. Davies); UNSM, ships from Africa. Howden (1970) stated that it is a University of Nebraska State Museum, Lincoln, NE (B. Ratcliffe); USNM, United States National Museum, Washington, DC (at University of Nebraska). Key to Genera and Species of Hybosoridae from North America and Northern Mexico 1. Antenna 10-segmented with 3-segmented club, Þrst segment hollowed to receive segments 2 and 3 (Fig. 1). Mandibles and labrum prominent ...................... .................... Hybosoridae, 2 1Ј. Antenna not as above. Mandibles and labrum not prominent .......Other Scarabaeoids 2. Frontoclypeal suture with medial, pyramidal tu- bercle (Fig. 3). Labrum without teeth..... ........... Pachyplectrus laevis LeConte 2Ј. Frontoclypeal suture without medial tubercle (Fig. 2). Labrum with 7Ð11 teeth ....... ..............Hybosorus illigeri Reiche Hybosorus MacLeay 1819 Type Species. Hybosorus illigeri Reiche 1853. Hybosorus illigeri Reiche 1853 (Figs. 2, 4Ð6, 9) Scarabaeus arator Illiger 1803: 210 (junior primary homonym). Fig. 2. Habitus of Hybosorus illigeri Reiche. 318 ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA Vol. 95, no. 3 (Kuijten 1983), and the Dominican Republic (new country record). I also found a specimen of H. illigeri from Venezuela collected in 1984. Four specimens were collected in Nicaragua in 1999Ð2000. Both con- stitute new country records. In the Old World, H. illigeri has a broad distribution. It occurs in temperate areas of Europe, all of Africa except the Sahara desert, and from the Middle East to Vietnam and China. Label data indicate localities at altitudes from sea level to nearly 2,000 m. Kuijten (1983) reported a specimen from the Spanish Sierra Nevada (2,600 m), an area covered by snow and ice during much of the year. The distribution of H. illigeri in the Old World shows the high adaptability of the species to a broad range of habitats and climatological conditions. In the New World, H. illigeri potentially could expand its range as far as California, Oregon, eastern Nebraska, and southern Illinois and Indiana in the United States, and throughout South America in- cluding the temperate areas of Argentina and Chile. Locality Records. 1,219 specimens examined. CUBA (10): Antilla Oriente, Playa Ingle´s, Playa Larga. DOMINICAN REPUBLIC (25): Los Hidalgos, Monte Cristo, San Cristo´bal, San Pedro de Macoris, Santo Domingo. BAHAMAS (29): GRAND BAHAMA ISLAND (17):
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