Nematodes collaris Bonvouloir, 1872, 2019

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 : 6-7

Nematodes collaris Bonvouloir, 1872

Fig. 9–11

Nematodes collaris Bonvouloir 1872 : plate 31, fig. 9; 1875: 663–664

Diagnosis. Very short, poorly-developed, incomplete femoral ridge at the base of the hypomera will readily distinguish N. collaris from all other Nematodes species present in the region.

Specimens examined. Ten specimens were available for study: FLORIDA: “ FLORIDA: Alachua Co., NW Gainesville, 1-IV-1974, J.B. Heppner” / “ Nematodes , collaris, Bonvouloir, Det. R.L. Otto, 2019 ” (1, FSCA). ILLI- NOIS: “ ILLINOIS: St. Clair County, 1.1 km NNW East St. Louis, 36.63384, -90.15347, 128m, 2–14 Jun 2016, Lindgren FT, S. Mills, BSF# 71866” (1, GERP) ; “ ILLINOIS St. Clair Co., 1.1 km NNW East St. Louis, 36.63384, -90.15347, 128m, 14–30 Jun 2016, LFT, S. Mills, BSF# 71543” (1, GERP). INDIANA: “ Indiana: Morgan Co. , June 12–July 10, 2009, purple sticky trap, Kyle E. Schnepp ” / “ Nematodes , collaris, Bonvouloir, Det. R.L. Otto, 2014 ” (1, KESC) ; “ Indiana: Montgomery Co., Shades State Park, June 13–July 1, 2013, Lindgren funnel trap, Kyle E. Schnepp ” (1, KESC). OHIO: “ OHIO, Scioto Co. , Shawnee St. For. , IX-1980 ” (“IX-” and “80” were handwritten) / “collectors:, B&BValentine” / “Valentine, Coll’n, Rec. 2016” / “ Nematodes , collaris, Bonvouloir, Det. R.L. Otto, 2019 ” (2, FSCA) ; “ OHIO: Sandusky Co., 1.4 km NNW Clyde , 41.3153, -82.9843, 200m, 14–30 June 2016, LFT, C. Poe, BSF#68617” / “ Nematodes , collaris, Bonvouloir, Det. R.L. Otto, 2017 ” (1, CMNH) ; “ OHIO: Lucas County, 4.8 km SSW Sylvania , 41.6792, -83.7361, 250m, 22 Jun–5 Jul 2016, LFT, C. Poe, BSF# 68323” (1, GERP) ; “ OHIO: Huron County, 0.8 km WSW Willard , 41.0514, -82.7373, 285m, 26 Jun–19 Jul 2018 ” / “cross-vane panel, trap, C. Mitchell, BSF#82591” (1, CMNH) .

Redescription. Length, 6.5–9.0 mm. Width, 1.0–2.0 mm. Body subcylindrical, elongate; either uniformly dark brown-black or bicolored with dark orange head/pronotum and dark brown-black elytra/venter; antennae dark brown; legs including tarsi dark brown; head, pronotum and elytra clothed with short, recumbent yellowish setae ( Fig. 9 ). Head: Subspherical; integument closely punctate, somewhat dullish; frons convex, with median, round, deep 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 elongate, longer than X, more than 2.0 times longer than wide. Pronotum: Integument dullish, densely punctate to rugose; longer than wide, with moderate, sharp hind angles; lateral sides parallel-sided, cranially arcuate; disc convex with deep median groove and pair of deep, 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. 10 ): Closely punctate, with short, recumbent yellowish setae; hypomeron with basally obliterated lateral antennal grooves; poorly-developed femoral ridge, short, incomplete, extending about 1/3 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. 11 ): Basal piece longer than wide, laterally parallel-sided, dorsally open, apically rounded; remaining parts elongate, parallel-sided; 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 very rarely seen eucnemid species was previously recorded in Illinois, Indiana, Kansas, Louisiana, Maryland, Ohio, South Carolina ( Otto and Karns 2017) and now newly recorded for the first time in Florida. A single specimen from Missouri was misidentified as N. collaris . There are currently no Missouri records for the species.

Biology. Adult specimens were taken from Lindgren funnel traps, purple sticky trap, cross-vane panel trap, canopy traps, flight intercept traps, and canopy Malaise traps. Immature stages remain unknown.

Note. According to Muona (pers. comm.), the editors had accidentally switched the illustrations of the aedeagus between this species and that of N. humphreyi in the 2000 Nearctic revision of the family.

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.)