Nematodes atropos (Say)

Otto, Robert L., 2021, A review of the Nearctic species of Nematodes (Coleoptera: Eucnemidae: Macraulacinae: Nematodini) with a description of one new species, Insecta Mundi 2021 (881), pp. 1-19 : 4-6

Nematodes atropos (Say)

Fig. 6–8

Eucnemis atropos Say 1836: 187–188

Diagnosis. Elongate and strongly-developed incomplete femoral ridge extending about 1/2 the length of the hypomeral base will readily distinguish the species from other Nematodes species present in the Nearctic region.

Specimens examined. Sixty-three specimens were available for study: FLORIDA: “ FLORIDA: Gainesville, 3517 NW 10TH Ave., 17-V-1993, R.E. Woodruff, blacklight trap” (1, FSCA); “FL: Alachua Co.:, Gainesville, NW 51st Terrace, 6 May 2009, coll. O.J. Blanchard” (‘st’ superscript on label) / “black, light” (1, FSCA); “FL: Alachua Co.:, Gainesville, NW 51st Terrace, 13 May 2009, coll. O.J. Blanchard” (‘st’ superscript on label) / “black, light” (1, FSCA); “ Florida: Alachua Co., Paynes Prairie Preserve, State Park campground, May 3, 2012 at light, Kyle E. Schnepp” (1, KESC); “ Florida: Alachua Co., San Felasco Preserve, April 5–May 6, 2014, Lindgren funnel trap, Kyle E. Schnepp” (1, KESC); “ Florida: Alachua Co., San Felasco Hammock, Preserve State Park, April 15, 2014, Kyle E. Schnepp” / “beaten from fallen, chinkapin oak branch, Quercus muehlenbergii ” (1, KESC); “ Florida: Alachua Co., 3.4 miles WNW Archer, March 28, 2016 beaten, from dead oak branch, Kyle E. Schnepp” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (‘17’ handwritten on label) (1, KESC); “ Florida: Suwanee Co., ~ 7 miles W White Springs, May 16–June 20, 2017, Lindgren funnel trap, Kyle E. Schnepp” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (1, KESC); “ Florida: Liberty Co., Torreya S.P. at light, May 11, 2018, Kyle E. Schnepp” (1, KESC); “ Florida: Alachua Co., San Felasco H.P.S.P., April 24–May 5 2021, Lindgren funnel trap, Kyle E. Schnepp” (2, KESC). GEORGIA: “ GEORGIA: Chatham Co., 1.4 km WNW Port Wentworth, 32.15091, -81.17832, 13m, 22 Mar–6 Apr 2016, LFT, R. Morgan, BSF# 66614” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (1, CMNH); “ GEORGIA: Chatham Co., 1.4 km WNW Port Wentworth, 32.15091, -81.17832, 13m, 5–19 Apr 2016, LFT, R. Morgan, BSF# 66615” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (1, CMNH); “ GEORGIA: Chatham Co., 1.4 km WNW Port Wentworth, 32.15091, -81.17832, 13m, 5–19 Apr 2016, Lindgren FT, R. Morgan, BSF# 66618” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (2, CMNH); “ GEORGIA: Chatham Co., 1.4 km WNW Port Wentworth, 32.15091, -81.17832, 13m, 16 Apr–2 May 2016, LFT, R. Morgan, BSF# 66583” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (1, CMNH); “ GEORGIA: Chatham Co., 1.4 km WNW Port Wentworth, 32.15091, -81.17832, 13m, 19 Apr–3 May 2016, LFT, R. Morgan, BSF# 66613” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (3, CMNH); “ GEORGIA: Chatham Co., 1.9 km N Garden City, 32.13098, -81.15114, 3m, 19 Apr–3 May 2018, LFT, S. Davis, BSF#78777” (1, CMNH); “ GEORGIA: Chatham Co., 0.9km ENE Port Wentworth, 32.15005, -81.15388, 3m, 19 Apr–3 May 2018, LFT, S. Davis, BSF#78796” (2, CMNH); “ GEORGIA: Chatham Co., 2.3 km NW Garden City, 32.1235, -81.17599, 5 m, 17–31 May 2018, LFT, S. Davis, BSF#79491” (1, CMNH); “GEOR- GIA: Chatham Co., 0.8km ENE Port Wentworth, 32.15031, -81.15459, 3m, 17–31 May 2018, LFT, S. Davis, BSF#79559” (1, CMNH). ILLINOIS: “ ILLINOIS: White County, 1.2 km SSE Grayville, 38.248574, -87.98698, 125m, 4–8 Jun 2018, T. Vorce, LFT, BSF#82162” (1, CMNH). INDIANA: “ Indiana: Morgan Co., June 12–July 10, 2009, purple sticky trap, Kyle E. Schnepp” (1, KESC); “ Indiana: Morgan Co., July 10–20, 2009, purple sticky trap, Kyle E. Schnepp” (1, KESC); “ Indiana: Morgan Co., June 14–29, 2010, black panel trap EtOH, Kyle E. Schnepp” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2014” (1, KESC); “ Indiana: Morgan Co., June 29–July 11, 2010, black panel trap EtOH, Kyle E. Schnepp” (1, KESC). KANSAS: “USA: Kansas: Labelle Co., Big Horn Resevoir, NW of dam, 37° 16.55’ N 95° 28.43’ W, 2–13-VI-2005 G.A. Salsbury, ex. canopy trap KAN1S05 100” (1, GERP); “USA: Kansas: Johnson Co., Overland Park Arboretum, 38°48.094’ N 94°41.310’ W, 12–20-VI-2006, A. Cruz ex., canopy trap KAN1S06 067” (1, GERP); “ KANSAS: Wyandotte Co., 3.5km WSW Kansas City, 39.10374, -94.66579, 268m, 17 May–7 June 2018, LFT, S. Roberts, BSF#83457” (2, CMNH); “ KANSAS: Jefferson Co., 2.5km N Grantville, 293m, 39.105735, -95.557166, 10 Jun–1 Jul 2019, LFT, S. Pellato, BSF#91322” (1, CMNH); “ KANSAS: Jefferson Co., 2.5 km N of Grantville, 39.105735, -95.557166, 293m, 1–8 Jul 2019, LFT, S. Pellato, BSF#91323” (1, CMNH). LOUISIANA: “LA: Baton Rouge, Place DuPlantier, Apts. V.26.85, Coll. E.G. Riley” (date handwritten) / “window trap” (3, GERP). MISSOURI: “MO: Jackson Co., Jackson, June 1998 ” (2, GERP); “ MISSOURI: St. Louis Co., 2.4 km E Maryland Heights, 38.71261, -90.40263, 193m, 14–27 June 2016, LFT, L. Trevathan, BSF#70244” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2017” (1, CMNH). OHIO: “ OHIO, Scioto Co., Shawnee St. For., IX-1980 ” (“IX-” and “80” were handwritten) / “collectors:, B&BValentine” / “Valentine, Coll’n, Rec. 2016” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2019” (10, FSCA); “USA: OH Cuyahoga Co., 09-VI-2000, on dead Hickory, colld by RJBuss” / “ Nematodes , collaris?” (handwritten in pencil) (1, GERP); “OH: Preble Co., Camden, 29 June 2001, Michael Ulyschen, Blacklight” (1, GERP); “ OHIO: Allen County, 3 km SW Lima, 263m, 40.7273, -84.1348, 19 Jun–3 Jul 2018, LFT, C. Poe, BSF#82558” (1, CMNH). SOUTH CAROLINA: “Dovehaven,” 7 mi., N.E. of Pickens, S.C., 11.VII.1979, H.L. Dozier” (“11.VII.” and “79” were handwritten) (1, FSCA); “ South Carolina: Pickens Co., ~ 5 miles north Clemson, June 20, 2018, under bark of fallen tree, Kyle E. Schnepp” / “ Nematodes , atropos, (Say) , Det. R.L. Otto, 2019” (2, KESC). TEXAS: “ TEXAS: Sabine Co., 9 mi., E. Hemphill “Beech, Bottom”, V-8–21-1989, R. Anderson & E. Morris, Malaise trap, beech-magnolia forest” (2, GERP). VIRGINIA: “VA: Appomattox Co., Appomattox, 29 – 30 June 2000, Robert Vigneault” (4, GERP).

Redescription. Length, 6.0–10.0 mm. Width, 1.5–2.0 mm. Body subcylindrical, elongate; uniformly dark brown; antennae dark brown; legs including tarsi dark brown; head, pronotum and elytra clothed with short, recumbent yellowish setae ( Fig. 6 ). Head: Subspherical; integument closely punctate, somewhat dullish; frons convex, with median, round, shallow fovea above frontoclypeal region; apical margin of frontoclypeal region weakly trilobed, about 2 times wider than base; mandibles stout, bidentate, densely punctate. Antenna: Filiform to weakly serriform from antennomeres III–XI, attaining nearly 1/3 the length of the body; antennomere III longer than IV; antennomeres IV–V each sub-equal, longer than wide, each slightly shorter than VI; antennomeres VI–X each sub-equal, longer than wide; antennomere XI stout, slightly longer than X, less than 2.0 times longer than wide. Pronotum: Integument dullish, densely punctate to rugose; longer than wide, with moderate, sharp hind angles; lateral sides basally constricted above pronotal hind angles, parallel-sided, cranially arcuate; disc convex with shallow median groove and pair of shallow, circular fovea; base sinuous. Scutellar shield: Elongate, sub-triangular, setose, shallowly punctate and distally rounded. Elytra: Distinctly striate; interstices elevated; integument somewhat shiny, transversely rugose at basal 1/2, closely punctate at apical 1/2. Legs: First tarsomere as long as the combined lengths of the remaining four on meso- and metatarsi; tibiae rounded in cross section; metatarsomeres I–III simple; metatarsomere IV excavate-emarginate; metatarsomere V short with simple claws. Venter ( Fig. 7 ): Closely punctate, with short, recumbent yellowish setae; hypomeron with basally obliterated lateral antennal grooves; strongly-developed femoral ridge incomplete, elongate, extending about 1/2 the length of the hypomeral base; metepisterna parallel-sided; elytral epipleura punctate; metacoxal plates medially more than 3.0–6.0 times wider than laterally; last abdominal ventrite apically produced. Aedeagus ( Fig. 8 ): Basal piece longer than wide, laterally parallel-sided, dorsally open, apically rounded; remaining parts elongate, constricted laterally just above the basal piece, laterally sinuous; parameres elongate, apically rounded, triangular-shaped lateral tooth present near apices; median lobe elongate and narrow, apically pointed, deeply and narrowly bifid, longer than parameres.

Distribution. This widespread, somewhat common eucnemid species has been taken from Alabama, Arkansas, Connecticut, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, and West Virginia ( Otto and Karns 2017).

Biology. Specimens were reared from dead Carya sp. Nutt. ( Juglandaceae ) limbs as well as captured in Lindgren funnel traps and other types of flight intercept traps. Five specimens were taken from lights or blacklights in Florida. Two other specimens were beaten from a dead oak limbs. Immature stages were briefly noted by Van Horn (1909), but never formally described.

Figures

Figures 6–11. Nematodes species. 6) Nematodes atropos (Say), female, dorsal habitus. 7) Nematodes atropos (Say), female, ventral habitus. 8) Nematodes atropos (Say), male, aedeagus, dorsal. 9) Nematodes collaris Bonvouloir, female, dorsal habitus. 10) Nematodes collaris Bonvouloir, female, ventral habitus. 11) Nematodes collaris Bonvouloir, aedeagus, dorsal. (Scale: 8, 11 = 1.0 mm; 6–7, 9–10 = 5.0 mm.)