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Coleoptera: Scarabaeidae: Aphodiinae), with Descriptions of Two New Genera from South America

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Coleoptera: Scarabaeidae: Aphodiinae), with Descriptions of Two New Genera from South America University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Papers in Entomology Museum, University of Nebraska State March 2003 Review of New World Aegialiini (Coleoptera: Scarabaeidae: Aphodiinae), with descriptions of two new genera from South America Zdzislawa Stebnicka Institute of Systematics and Evolution of Animals, Polish Academy of Sciences Marco Dellacasa Università di Pisa, Centro interdipartimentale Paul E. Skelley FDACS-DPI Follow this and additional works at: https://digitalcommons.unl.edu/entomologypapers Part of the Entomology Commons Stebnicka, Zdzislawa; Dellacasa, Marco; and Skelley, Paul E., "Review of New World Aegialiini (Coleoptera: Scarabaeidae: Aphodiinae), with descriptions of two new genera from South America" (2003). Papers in Entomology. 110. https://digitalcommons.unl.edu/entomologypapers/110 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. INSECTA MUNDI, Vol. 17, No. 1-2, March-June, 2003 73 Review of New World Aegialiini (Coleoptera: Scarabaeidae: Aphodiinae), with descriptions of two new genera from South America. Zdzislawa T. Stebnicka Institute of Sytematics and Evolution of Animals Polish Academy of Sciences Slawkowska 17 31-016 Krakow, POLAND Marco Dellacasa Università di Pisa Centro interdipartimentale Museo di Storia Naturale e del Territorio Via Roma, 79 56011 Calci (PI) ITALY and Paul E. Skelley, FDACS-DPI Florida State Collection of Arthropods P.O.Box 147100, 1911 SW 34th St. Gainesville, FL 32614-7100, USA Abstract. Two new taxa of Aegialiini (Coleoptera: Scarabaeidae: Aphodiinae) are described from South America: Argeremazus neuquen Stebnicka and Dellacasa, n.gen, n.sp, and Amerisaprus valdivia Stebnicka and Skelley, n.gen, n.sp. Both genera are presently monotypic. Discussion on the generic status of Caelius Lewis is presented. A key to genera and checklist of aegialiine taxa occurring in the New World are presented. Key Words. Scarabaeidae, Aphodiinae, Aegialiini, Argeremazus, Amerisaprus Introduction FMNH – Field Museum of Natural History, Chicago, IL-USA As part of a larger study on New World aphodiine ISEA – Institute of Systematics and Evolution of beetles, an author (PES) discovered a new genus of Animals, PAS, Krakow, Poland aegialiinescarab.Wishingtogetthistaxondescribed, PESC – P. E. Skelley collection, Gainesville, FL-USA the other authors were contacted for assistance. They had an additional taxon needing description and taxonomic comments to make on the group. It was Key to New World Aegialiini genera and decided to review the Aegialiini occurring in the New subgenera World, describe new genera, and present an updated checklist of taxa. The following key is based on those of Stebnicka (1977) and Gordon and Cartwright (1988). Materials 1. Head with surface not setose, variously sculptured, Materials studied are deposited in the following may have with setal fringe on clypeus .............2 collections: – Head with surface distinctly setose (Fig. 2) ......... CMN – Canadian Museum of Nature (Martinez col- .. Argeremazus Stebnicka and Dellacasa, n.gen. lection via H.Howden) 74 Volume 17, No. 1-2, March-June, 2003, INSECTA MUNDI 2. Elytral intervals with short hair; abdominal ster- dilated; metatibial spurs divided by base of hind nites narrowed medially, fifth sternite obliterat- tarsomere (rarely not divided). ed at middle by sixth sternite............................ Body medium sized, length 1.8 - 8.8 mm, oblong ............................................. Micraegialia Brown ovaltoparallel-sidedorglobularmoderatelytostrong- – Elytral intervals lacking short hair; abdominal ly convex, glossy, colour yellowish varying to dark sternites not narrowed medially, fifth sternite not obliterated at middle by sixth sternite ....3 brown; margins of head, pronotum and elytra clearly piliferous. Head moderate in size, clypeus shortened 3. Elytral humerus dentate (Fig. 7); body form paral- exposing mouthparts or anterior of clypeus narrowly lel-sided ............................................................. 4 prolongedtocovermouthparts(Argeremazusn. gen.); – Elytral humerus not dentate; body form elongate to surfacepunctateorgranulate-verrucose;clypeo-fron- globose ............................................................... 5 tal suture marked between eyes by blackish line or fine carina, terminal segment of maxillary palpus 4. Pronotum with posterior angle eroded, bearing cylindrical. Eyes small to moderate in size, invisible several small teeth; apical metatibial spurs not from above. Pronotum subquadrate or transverse, separated at base; Chile .................................... ...... Amerisaprus Stebnicka and Skelley, n.gen. evenly convex, sides and base finely margined, sur- – Pronotum with posterior angle not notably eroded, face punctured. Scutellum small, triangular. Elytra lacking distinct teeth; apical metatibial spurs usually with striae, surface smooth or punctate. separated at base by metatarsus; western North Ventral surface glabrous or covered with long, pale America and Japan .................... Caelius Lewis hair; metasternum elevated; abdomen with five or six sternites visible, sternites coalesced or not, sutures 5. Maxillary palpus with terminal segment enlarged, membranous or stiff. Legs slender or robust; meso- widest at basal third, abruptly narrowed at base; and metafemora fusiform; protibia relatively long body red-brown, form notably elongate, almost with three to five widely separated lateral teeth and parallel sided; basal marginal line of pronotum indistinct or lacking .............Rhysothorax Bedel slender terminal spur; meso- and metatibiae with – Maxillary palpus with terminal segment cylindri- distinct transverse ridges or with traces of ridges, cal; species with body black, form elongate to shortly setaceous or with fringe of thick setae and globose, but not parallel sided; basal marginal surface covered with pale hair; terminal spurs of line of pronotum usually distinct, at least later- metatibia slender, acute, semifoliaceous or folia- ally [Aegialia Latreille] .................................... 6 ceous, placed separately on each side of tarsal inser- tion or located close together below tarsal insertion 6. Pronotum approximately one third as long as (genera SaprusBlackburn and Amerisaprus n. gen.); elytron, surface near posterior angle impunctate metatarsus short or moderate in length, tarsomeres or feebly so; meso- and metatibia robust or slen- der, spurs slender or foliaceous ......................... cylindrical or triangular setaceous. Sexual differenc- ............................... Aegialia (Aegialia) Latreille es indicated in the length of penultimate abdominal – Pronotum approximately half as long as elytron, sternite, in the shape and sculpture of pronotum, in surface near posterior angle coarsely punctate; the terminal spur of protibia and/or in the length of meso- and metatibia slender, apical spurs slen- penultimate abdominal sternite. der .............. Aegialia (Psammoporus) Thomson Diversity and Distribution. About 65 species are known worldwide, primarily in northern temperate Taxonomic accounts areas. They are the Holarctic Aegialia Latreille, Rhysothorax Bedel, and Caelius Lewis; the Nearctic TRIBE AEGIALIINI Laporte de Castelnau 1840 Micraegialia Brown; the Himalayan-Sichuanan Sil- luvia Landin; and the Central Asia and North Africa = Silluviini Landin 1949 Eremazus Mulsant. The previously known excep- tions are the Australian and Tasmanian genus Sa- Type genus: Aegialia Latreille 1807. prus Blackburn (Stebnicka and Howden 1995), and Aegialia argentina Martinez et al., in Argentina. Two Diagnostic characters. Head flat or slightly con- new genera and species are added to the South vex, surface granulate or punctate. Mandibles with American fauna in this paper. apices exposed, not covered by the clypeus. Pygidium The main references available for the group are lacking longitudinal groove at base, usually lacking Stebnicka’s (1977) world revision and Gordon and transverse ridge at middle. Tibiae stout, frequently Cartwright’s (1988) Nearctic revision. These refer- INSECTA MUNDI, Vol. 17, No. 1-2, March-June, 2003 75 2 1 3 Figures 1-3. Argeremazus neuquen Stebnicka and Dellacasa, holotype, 1) dorsal habitus, 2) head, right lateral view, 3) right metatibia. ences have keys to species and other important infor- ation, sides slightly arcuate and excised in front of mation on the Aegialiinae. Readers are urged to gena, genae small, setaceous, only slightly exceeding consult them for taxa not considered further. Below, eyes; clypeal surface (Fig. 2) just above median emar- we also discuss an apparent change in the status of gination with narrow band of minute granules, medi- two subgenera. an area between genae coarsely transversely wrin- kled or granulate with short, erect, hair-like setae; References: Gordon and Cartwright 1988 (revision clypeo-genal suture in form of arcuate carina extends of North America, illustrate most species). Stebnicka around of granulate area, base of head with band of 1977(worldrevision),RustandHanks1982(biology), coarse punctures irregularly crenating carina and Jerath and Ritcher 1959 (biology); Porter and Rust concentrated near eyes, middle of vertex polished, 1996, 1997 (phylogenetic and molecular studies), glabrous. Mouthparts
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