By Ross H. Arnett JR, Michael C. Thomas, Paul E. Skelley, J. Howard Frank
Specialists supply the main sweeping reference to be had almost about North American beetles. Their rigorous criteria for the presentation of information create a concise, beneficial layout that's constant through the e-book. this can be the source of selection for fast, exact, and simply available information.
Read or Download American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea PDF
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Additional info for American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
The diversity in structure in both adults and larvae has led to differences of opinion regarding classification, evolution, and monophyly of the group and the genera assigned to it. There is evidence that the group (as defined in this work) includes two distinct lineages: the Bolboceratinae and Athyreinae forming one lineage, and the Geotrupinae, Taurocerastinae, and Lethrinae forming the other. 24 · Family 29. 29. Dorsal view of head and apex of pronotum showing: 2. Ceratophyus gopherinus Cartwright, apex of mandibles deeply bidentate and pronotum with central horn; 3.
Pronotum short, broad, convex. Elytra convex with 10 distinct costae, intercostae with or without distinct punctures. Pygidium concealed by elytra. Scutellum exposed. Legs with coxae transverse; protibia fossorial, outer margin toothed, apex with one spur; meso- and metatibia with 2 apical spurs; metafemora and metatibiae enlarged to cover abdomen in retracted position; tarsi 5-5-5; claws equal in size, simple; empodium absent. Abdomen with 5 free sternites; 8 functional abdominal spiracles situated in pleural membrane.
Description. 0 mm. Shape oval or round. Color yellowish, brown, orange-brown, reddish-brown, purple, brown, or black (with or without metallic reflections). Head not deflexed. Antennae 11-segmented with 3-segmented, opposable club (all antennomeres tomentose). Eyes with eucone or exocone ommatidia, completely or partially divided by canthus. 29. Bolboceras filicornis horn. Labrum truncate, promi(Say) (Used by permission of nent, produced beyond apex University of Nebraska State of clypeus. Mandibles proMuseum) duced beyond apex of labrum, prominent.
American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea by Ross H. Arnett JR, Michael C. Thomas, Paul E. Skelley, J. Howard Frank