Nematodes humphreyi Muona, 2000, 2014

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 : 7-9

Nematodes humphreyi Muona, 2000

Fig. 12–14

Nematodes humphreyi Muona 2000: 102

Diagnosis. Complete femoral ridge extending to the lateral side of the pronotum will distinguish N. humphreyi from all known Nematodes species present in the Nearctic region.

Specimens examined. Twenty-one specimens were available for study: FLORIDA: “ FLORIDA: Dade Co., Camp Mahachee, nr., Matheson Hammock, 12-IV-1991, J. Gleason, Blacklight trap ” (1, GERP) ; “ FLORIDA: Miami- Dade Co., Miami, Greynolds Park West , 25.944, -80.1556, 5-V-2011, P. Perez, M. YongCong, J. Garcia, lindgren funnel trap w/ phoebe oil” (1, FSCA) ; “ FLORIDA: Broward Co., Dania Beach, Secret , Woods Nature Ctr. , 19-IV- 2013, M. DaCosta, J. Garcia Stickyboard trap ” (1, FSCA); Florida: Monroe Co., Upper Key Largo, May 25, 2014 at light, Kyle E. Schnepp ” / “ Nematodes , humphreyi, Muona, Det. R.L. Otto, 2014 ” (1, KESC) ; “ Florida: Monroe Co., Upper Key Largo , May 15, 2016 stump, of small tree at night, Kyle E. Schnepp” (1, GERP; 4, KESC) ; “ Florida: Monroe Co., Upper Key Largo , May, 15, 2016 at light, Kyle E. Schnepp” (1, KESC) ; “ Florida: Monroe Co., Upper Key Largo , May 29, 2016 at light, Kyle E. Schnepp” (1, GERP; 1, KESC) ; “ Florida: Monroe Co., Upper Key Largo , May 30, 2016 at light, Kyle E. Schnepp” (1, GERP; 5, KESC) ; “ Florida: Monroe Co., Upper Key Largo , May 30, 2016, on cut tree at night, Kyle E. Schnepp” (2, KESC) ; “ Florida: Monroe Co., Upper Key Largo , May 18, 2018 at light, Kyle E. Schnepp” (1, KESC) .

Redescription. Length, 5.0– 7.5 mm. Width, 1.0–2.0 mm. Body subcylindrical, elongate; uniformly dark brown; antennae dark reddish-brown; legs including tarsi dark reddish-brown; head, pronotum and elytra clothed with short, recumbent yellowish setae ( Fig. 12 ). Head: Subspherical; integument closely punctate/rugose to confluently rugose, 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, slightly longer than wide, each shorter than VI; antennomeres VI–X each sub-equal, longer than wide; antennomere XI elongate, slightly longer than X, more than 2.0 times longer than wide. Pronotum: Integument somewhat dullish, densely punctate to rugose; longer than wide, with moderate, sharp hind angles; lateral sides parallel-sided at basal half, arcuate at cranial 1/2; disc convex with shallow median groove extending through entire length 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 throughout. 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. 13 ): Closely punctate, with short, recumbent yellowish setae; hypomeron with indicated, medially undefined lateral antennal grooves; well-developed femoral ridge complete, extending to the lateral side of the pronotum; 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. 14 ): Basal piece longer than wide, laterally parallel-sided, dorsally open, apically rounded; remaining parts elongate, basally bulbous above basal piece, laterally sinuous; parameres elongate, apically rounded, hook-like lateral tooth present base of parameres; median lobe elongate and narrow, apically pointed, deeply and narrowly bifid, slightly longer than parameres.

Distribution. This precinctive Florida eucnemid species is known from a small number of locations in southern Florida.

Biology. One specimen has been taken from a blacklight trap in Dade County. Two specimens were taken from a small cut tree at night. Eleven specimens were taken from lights in the Upper Key Largo. Five specimens were taken from a stump of a small tree at night. 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. collaris in the 2000 Nearctic revision of the family.

Figures

Figures 12–17. Nematodes species. 12) Nematodes humphreyi Muona, male, dorsal habitus. 13) Nematodes humphreyi Muona, male, ventral habitus. 14) Nematodes humphreyi Muona, male, aedeagus, dorsal. 15) Nematodes penetrans (LeConte), female, dorsal habitus. 16) Nematodes penetrans (LeConte), female, ventral habitus. 17) Nematodes penetrans (LeConte), male, aedeagus, dorsal. (Scale: 12–13 = 5.0 mm; 14–17 = 1.0 mm.)