Aegomorphus quadrigibbus ( Say, 1831 ), 2020

Santos-Silva, Antonio, Botero, Juan Pablo & Wappes, James E., 2020, Neotropical Acanthoderini (Coleoptera, Cerambycidae, Lamiinae): Synonymies and new status in some genera, new species, transferences and new distributional records, Papéis Avulsos de Zoologia 60, pp. 1-40 : 22-23

Aegomorphus quadrigibbus ( Say, 1831) ( Figs. 101-109 )

Acanthocinus quadrigibbus Say, 1831: 9, 1835: 195 ; LeConte, 1859: 665.

Acanthoderes quadrigibbus ; Haldeman, 1847: 45; LeConte, 1852: 175; Melsheimer, 1853: 107 (cat.); Bland, 1861: 97 (distr.); LeConte, 1873: 337, 1880: 237 (hosts); Packard, 1881: 55, 75, 131 (biol.); LeConte & Horn, 1883: 322; Shufeldt, 1884: 334, 338 (distr.); Townsend, 1884: 222; Harrington, 1884: 48 (hosts); Townsend, 1885: 70 (distr.); Chittenden, 1894: 99 (hosts); Knobel, 1895: 34; Hamilton, 1895: 339 (distr.); Leng & Hamilton, 1896: 114; Wickham, 1897: 206; Harrington, 1897: 74 (hosts); Smith, 1900: 294 (distr.); Dury, 1902: 162 (distr.); Ulke, 1903: 26 (distr.); Felt, 1906: 702, 715 (biol.); Smith, 1910: 333; Blatchley, 1910: 1070; Fisher & Kirk, 1912: 314 (distr.); Johnson, 1915: 315 (distr.); Nicolay, 1919: 70 (distr.); Craighead, 1923: 113 (larva); Turnbow & Franklin, 1980: 344 (distr.).

Psapharochrus quadrigibbus ; Lacordaire, 1872: 751; Casey, 1913: 301; Champlain et al., 1925: 140 (hosts); Kirk & Knull, 1926: 42 (distr.); Leonard, 1928: 451 (distr.); Beaulne, 1932: 219 (hosts); Pechuman, 1937: 12 (biol.); Brimley, 1938: 217; Kaston, 1938: 239 (biol.); Hoffman, 1942: 11; Knull, 1944: 92 (distr.); Beal & Massey, 1945: 148 (biol.); Loding, 1945: 122 (distr.); Knull, 1946: 243; Fattig, 1947: 33 (distr.); Jaques, 1951: 267; Alexander, 1958: 49 (distr.); Solomon et al., 1976: 290; Monné, 2005: 211 (cat.).

Acanthoderes quadrigibba ; Gemminger, 1873: 3146 (cat.); Horn, 1880: 115; Franz, 1954: 226 (distr.); Duffy, 1960: 214 (larva, biol.); Gilmour, 1965: 613 (cat.); Zajciw, 1969b: 609 (distr.); Perrault, 1978: 380 (distr.); Rice & Enns,1981:92 (distr.,hosts); Chemsak & Hovore, 2002b: 12; Hernández-Fuentes et al., 2018: 544 (distr.; host).

Acanthoderes (Acanthoderes) quadrigibba ; Swift et al., 2010: 45 (distr.); Maes et al., 2010: 319 (distr.); Audureau, 2010: 8 (distr.); Holt, 2013: 252 (distr.); Klingeman et al., 2017: 298 (distr.); Audureau & Roguet, 2018: 76 (distr.); Monné, 2019: 222 (cat.).

Acanthoderes 4-gibbus; Riley, 1880: 270 (hosts); Packard, 1890: 91, 221, 291, 520 (biol.); Caulfield, 1890: 66 (hosts); Beutenmuller, 1896: 78 (hosts).

Aegomorphus quadrigibbus ; Linsley & Chemsak,1985:246 (syn.); Hovore et al., 1987: 316 (distr.); Chemsak et al., 1992: 131 (checklist); Lingafelter & Horner, 1993: 183 (distr.); MacRae, 1993: 244 (distr.); Monné & Giesbert, 1994: 35 (checklist); Monné, 1994: 35 (cat.); Yanega, 1996: 133; Noguera & Chemsak, 1996: 406 (distr.); Linsley & Chemsak, 1997: 339 (hosts); Peck & Thomas, 1998: 122 (distr.); Schiefer, 1998: 125 (distr.); Monné, 2001: 39 (cat. hosts); Vlasak & Vlasakova, 2002: 214 (hosts).

Acanthoderes (Psapharochrus) quadrigibba ; Aurivillius, 1923: 387 (cat.).

Psapharochrus quadrigibbus lucidus Knull, 1958: 282 ; Chemsak, 1977: 178 (type).

Acanthoderes (Psapharochrus) quadrigibba lucidus ; Gilmour, 1965: 613 (cat.).

Although originally described in Acanthocinus by Say, 1831 and moved to Acanthoderes by Haldeman (1847) it was Lacordaire (1872) who finally transferred Acanthoderes quadrigibbus to Psapharochrus , affirming that this latter genus included most of the species allocated in Acanthoderes at that time. Curiously, the species continued to be quoted as being in Acanthoderes , and it was Casey (1913) who finally correctly listed it again in Psapharochrus . Even so, the species continued to be mentioned as belonging to Acanthoderes , until Aurivillius (1923) moved Psapharochrus to the status of a subgenus of Acanthoderes and included A. quadrigibba in it. From Aurivillius (1923) to Rice & Enns (1981) the species was mentioned in Psapharochrus (as a distinct genus) or in Acanthoderes (Psapharochrus) . More recently, Linsley & Chemsak (1985) transferred the species to Aegomorphus , but only because of their doubts: “Since the species of Acanthoderes sensu latu are extremely numerous the question of generic or subgeneric assignments is difficult and beyond the scope of this work… We are assigning our five species of ‘Acanthoderes’ to Aegomorphus Haldeman until the problem can be resolved for the entire group.” Finally, Chemsak & Hovore (2002b) transferred Aegomorphus quadrigibbus to Acanthoderes . The thinking behind what these authors were trying to do is somewhat mysterious, since they reported: “We have used the name Acanthoderes herein for placement of taxa which possess most of the characters of Acanthoderes varia and Aegomorphus decipiens , and which fit within the existing parameters of the genus sensu latu, without assignment to subgenera.” We do not know for sure what “ Acanthoderes varia ” is, but it is likely Cerambyx varius Fabricius, 1787 (currently equal to Cerambyx clavipes Schrank, 1781 , and placed in Aegomorphus ). As Aegomorphus decipiens is the type species of Aegomorphus , this affirmation may have indicated their view that it was closely related to Acanthoderes . For sure, it was a transference based on doubts, and not on justified or definable features.

Acanthocinus quadrigibbus Say, 1831 has the eyes coarsely faceted, and pronotum not distinctly depressed centrally. Accordingly, it belongs to and is hereby transferred to Aegomorphus .

As correctly reported by Chemsak & Hovore (2002b) for this species “the variation within and be- tween samples is considerable.” The elytral pubescence ( Figs. 101, 106-109 ) is extremely variable in concentration, but much less so in position of the maculae, and although the anterior light pubescent macula of the elytra is from slightly distinct to well-marked its placement on the elytra remains the same.

Material examined: MEXICO, Guerrero: Hwy 200, 51 km NE Ixtapa , 6 males, 4 females, 18-21.VII.1985, Wappes col. ( ACMT) ; 1 female, 17-20.VII.1985, Wappes col. ( ACMT) . Quintana Roo (new state record): Hwy 307, 5 km S Cancun A.P., 1 male, 09.VI.2005, Skillman Jr. col. ( FWSC) ; 1-5 km S Cancun, 1 male, 04.VI.2009, Skillman & Hildebrant col. ( FWSC) . Veracruz: Laguna Catemaco, 1 male, 24-25.V.1969, J.E.H. Martin col. ( MZSP) ; 1 male, 09.VI.1969, J.E.H. Martin col. ( MZSP) ; 1 male, 25.VI.1969, Bright & Campbell col. ( MZSP) ; 1 male, 08-16.VIII.1969, H.F. Howden col. ( MZSP) . GUATEMALA (new country record): Baja Verapaz: CA14, km 149-151, 1 male, 2 females, 25.VII.2008, Skillman and C. & L. O’Brien col. ( FWSC) .

Known geographical distribution ( Monné, 2019; Tavakilian & Chevillotte, 2019; new records): Canada, Eastern United States to Florida and Texas, Mexico (Chiapas, Guerrero, Jalisco, Yucatán, Nayarit, Quintana Roo), Guatemala, Nicaragua, Costa Rica.

Figures

Figures 100-109. (100) Psapharochrus lugens, holotype, dorsal habitus. (101‑109) Aegomorphus quadrigibbus. (101) Male, specimen 1, from Mexico (Guerrero), dorsal habitus.(102) Male,specimen 1, from Mexico (Guerrero),ventral habitus.(103)Male,specimen 1, from Mexico (Guerrero),lateral habitus.(104) Male, specimen 1, from Mexico (Guerrero),head,frontal view.(105)Male,specimen 1, from Mexico (Guerrero),lower eye lobe.(106)Male,specimen 2, from Mexico (Guerrero), dorsalhabitus.(107)Male,specimen3,fromMexico (Veracruz).(108)Female,specimen1,fromMexico(Guerrero).(109)Female,specimen2,fromMexico(Guerrero).