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A Phylogenetic Analysis of the Dung Beetle Genus Phanaeus (Coleoptera: Scarabaeidae) Based on Morphological Data

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A Phylogenetic Analysis of the Dung Beetle Genus Phanaeus (Coleoptera: Scarabaeidae) Based on Morphological Data A phylogenetic analysis of the dung beetle genus Phanaeus (Coleoptera: Scarabaeidae) based on morphological data DANA L. PRICE Insect Syst.Evol. Price, D. L.: A phylogenetic analysis of the dung beetle genus Phanaeus (Coleoptera: Scarabaeidae) based on morphological data. Insect Syst. Evol. 38: 1-18. Copenhagen, April, 2007. ISSN 1399-560X. The genus Phanaeus (Scarabaeidae: Scarabaeinae) forms an important part of the dung bee- tle fauna in much of the Western Hemisphere. Here a phylogeny for Phanaeus, including 49 Phanaeus sp., and 12 outgroup taxa, is proposed. Parsimony analysis of 67 morphological characters, and one biogeographical character produced 629 equally parsimonious trees of 276 steps. Oxysternon, the putative sister taxon is nested well within the subgenus Notiophanaeus, implying that Oxysternon might ultimately need to be synonymized with Phanaeus. Species groups of Edmonds (1994) recovered as monophyletic are paleano, endymion, chalcomelas, tridens, triangularis, and quadridens. An ‘unscaled’ equal weighting analysis yielded 57,149 equally parsimonious trees of 372 steps. The strict consensus of these trees yielded a mono- phyletic Phanaeus with the inclusion of Oxysternon. Bootstrap values are relatively low and some clades are unresolved. Dana L. Price, Graduate Program of Ecology and Evolution, Rutgers University, DEENR, 1st Floor, 14 College Farm Road, New Brunswick, NJ 08901 ([email protected]). Introduction morphological characters and cladistic methods, The genus Phanaeus is a group of tunneling dung the phylogeny of this clade. Hence, the monophy- beetles that are well known for their bright metal- ly of the genus, as well as relationships among lic colors and striking sexual dimorphism Phanaeus, with special attention to previously (Edmonds 1979). Despite numerous studies on proposed species groups, are also examined. biology and behavior of Phanaeus dung beetles, While most species delineations within Pha- there has been no systematic research on the evo- naeus are generally accepted, much controversy lutionary relationships among the species. surrounds the number of subspecies. Edmonds However, a detailed study of the skeletal morphol- (1994) four subspecies have since been increased ogy of Phanaeus vindex Macleay (Edmonds to 26 subspecies. Subspecies descriptions from the 1972), and a revision of the genus (Edmonds literature are poor, type specimens would be need- 1994) have provided essential taxonomic informa- ed in order to determine the differences, and tion about this group. Edmonds (1994) revision obtaining type specimens can be quite difficult for split Phanaeus into two subgenera: Notiopha- studies not involving revisionary work. In addi- naeus and Phanaeus s. str.. Notiophanaeus com- tion, for several subspecies the only defining char- prises five species groups including 15 mostly acteristic was color. Coloration is an important South American species. Phanaeus s. str., includes aspect of the morphology of these beetles, but its 27 species (+ four subspecies) arranged in eight high intraspecific variation seriously limits its tax- species groups, mostly in Middle America. Since onomic usefulness (Edmonds 1994). For these rea- 1994, nine new species have been described. The sons the subspecific nomenclature of Edmonds principal aim of this study is to investigate, using (1994) was used in this study. © Insect Systematics & Evolution (Group 2) 2 Price,D.L. INSECT SYST. EVOL. 38:1 (2007) Material and methods lobase and parameres), and pygidum were fol- lowed by standard treatment with 10% KOH. Specimens used in this study were generously lent Specimens were stored in 75% ethanol. Only dis- by the following institutions and people: David sected characters that showed no intraspecific vari- Furth and Nancy Adams, The National Museum of ation were used in this study. P. chalcomelas,a Natural History, Washington, D.C., U.S.A. species for which many individuals were avail- (NMNH); Francois Genier, Canadian Museum of able, was used as a model for character choice. Nature, Ottawa, Ontario, Canada (CMN); Weiping One to four individuals of all other species were Xie, The Natural History Museum of Los Angeles examined. Line drawings were made using a Wild County, Los Angeles, California, U.S.A. (NHM- Heerbrugg stereomicroscope equipped with a LAC); Sacha Spector, The American Museum of camera lucida. Additional characters were pho- Natural History, New York, U.S.A. (AMNH); tographed using a Nikon 995 Coolpix digital cam- W.D. Edmonds, Marfa, Texas, U.S.A; Trond era with a digital adapter lens. Larsen, Princeton University, Princeton, New Jersey, U.S.A.; Kevina Vulinec, Delaware State Analysis University, Dover, Delaware, U.S.A.; Barney Phylogenetic analyses based on maximum parsi- Streit, Tucson, Arizona, U.S.A.; and M.C. mony were carried out in PAUP 4.0b10 (Swofford Thomas, Florida Department of Agriculture and 1999) using heuristic searches of 10,000 random- Consumer Services, Gainsville, Florida, U.S.A. ized replicates, TBR branch swapping, and ACC- Taxa TRAN character-state optimization. Because of the large numbers of equally parsimonious trees, Forty-nine of fifty-one species total and two sub- the number of trees saved per replicate was limit- species of Phanaeus were examined (following ed to 100 during the first search. Another single the nomenclature of Edmonds 1994). Coprophan- heuristic search was then performed, starting with aeus pluto (Harold, 1863), C. telamon (Erichson, the trees saved from the initial analysis. Each char- 1847), Oxysternon conspicullatum (Weber, 1801), acter was weighted equally regardless of character O. lautum (Macleay, 1819), O. palaemon Laporte, type and the number of states (‘scaled’ equal 1840, O. silenus Laporte, 1840, O. spiniferum La- weighting). Because some characters have multi- porte, 1840, Sulcophanaeus auricollis (Harold, ple states, state transitions were, in effect, down- 1880), S. favnus (Fabricius, 1771), and S. impera- weighted in proportion to the number of states for tor (Chevrolat, 1844) are included as outgroup these characters relative to binary characters (May taxa. Additional outgroup taxa from the tribe 2002). In a second analysis, also using ‘scaled’, Eucraniini were Anomiopsoides heteroclyta (Blan- equally weighted characters, Phanaeus was con- chard, 1845), and Glyphoderus sterquilinus (West- strained as monophyletic using the “constraints” wood, 1837). Outgroup representatives were cho- command in PAUP, with Oxysternon as an out- sen according to a recent phylogenetic analysis of group (Outgroups+Oxysternon (Phanaeus)). the tribe Phanaeini (Philips et al. 2004). Additional weighting schemes examined include equal weighting for each state change (“unscaled Character selection equal weighting”) (May 2002) and pseudorepli- Sixty-seven morphological characters and one bio- cate reweighting (Kjer 2001; 2002). The unscaled geographical character were scored (Appendix 1). analysis was performed using the same methods as Terminology and nomenclature follows Edmonds described for the scaled analysis. The pseudorepli- (1972; 1994). Several external morphological cate weighting scheme was accomplished by con- characters from Edmonds (1994) have been re- ducting a bootstrap analysis with 100,000 repli- evaluated and coded. New characters include those cates, using “Fast” stepwise-addition, including of the antennae, legs, labrum, pygidium, and geni- groups compatible with the 50% majority rule and talia. Emphasis is placed on large male secondary saving the 100,000 trees to a tree file. Each char- sexual characters. For a number of species, some acter was then reweighted according to the characters could not be scored due to lack of mate- rescaled consistency index, using the ‘best fit’ rial, although in a few cases information was sup- option in PAUP to all starting trees. A heuristic plemented from the literature. Dissections of the search of 1,000 replicates (saving no more than labrum (male and female), male genitalia (phal- 100 trees) was then conducted using the rescaled INSECT SYST. EVOL. 38:1 (2007) Phylogeny of Phanaeus 3 Figs 1-9. Clypeus of Phanaeus spp. 1-4. Anterior margin of clypeus: 1. rounded clypeus of P. furiosus (top), slight- ly bidentate cypeus of P. splendidulus (middle) and P. melibaeus (bottom); 2. Strongly bidentate clypeus of P. paleano ; 3. Coprophanaeus telamon; 4. Anomiopsoides heteroclyta. 5-6. Lateral margin of the clypeus and the pari- etal area: 5. P. vindex; 6. Anomiopsoides heteroclyta female. 7. Outer margin of P. palliatus clypeus and parietal area. 8-9. Frontal view of clypeal process: 8. transverse process of P. eximius (top), and toothlike process of P. haroldi (bot- tom); 9. spiniform process of P. dejeani (top), and P. paleano (bottom). 4 Price,D.L. INSECT SYST. EVOL. 38:1 (2007) Figs 10-16. Head capsule structures in Phanaeus spp. 10-12. Cephalic carina of large female in frontal view: 10. sim- ple carina of P. splendidulus; 11. trituberculate carina of P. bispinus (top), and P. mexicanus (bottom); 12. bitubercu- late carina of P. vindex. 13. Male horn in dorsal view: P. dejeani (left), and P. bispinus (right). 14-16. Male horn shape in lateral view: 14. P. splendidulus; 15. P. igneus; 16. P. a. amethystinus. data. The advantage of pseudoreplicate reweight- Characters and character states ing over successive weighting (Farris 1969) is that Morphological terms are based on Edmond’s the large number of diverse but potentially near (1972) examination of the skeletal morphology of optimal starting
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