Fornax convexicollis Otto, 2020

Otto, Robert L., 2020, A review of the Nearctic species of Fornax Laporte (Coleoptera: Eucnemidae: Macraulacinae: Macraulacini) with descriptions of six new species, Insecta Mundi 2020 (818), pp. 1-26 : 10-12

Fornax convexicollis Otto , new species

Fig. 13–16

Diagnosis. Presence of a delicate, narrowly incomplete interantennal carina at the base of the frontoclypeal region distinguishes the new species from nearly all Fornax species in the United States, except F. parallelicollis new species. Presence of delicate, short, shallow median groove on the pronotal disc further distinguishes F. convexicollis new species from F. parallelicollis new species.

Type material. Male holotype: “FL: Polk Co., Green Swamp WMA, 19 May–3 June 2001, Morris and Nigg, Malaise Trap” / “ HOLOTYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [red printed label]. Female allotype: “ FLORIDA: Lee Co., Alva 5-V-2008, L. Rigby, Lindgren,

funnel trap w/ Persea ” / “ ALLOTYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♀ handwritten behind species name on label) [yellow printed label]. Holotype was transferred from GERP to CMNH. Allotype is deposited in FSCA.

Paratypes. 12 ♂♂, 6 ♀♀: FLORIDA: 1 ♂, “ FLORIDA: DADE COUNTY, CAMP MAHACHEE, NR., MATHE- SON HAMMOCK, 12-V-1983, MCTHOMAS & LPARKER, BLACKLIGHT TRAP” / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( FSCA); 1 ♂ 1 ♀, “ FLORIDA: DADE COUNTY, CAMP MAHACHEE, NR., MATHESON HAMMOCK, 27-V- 1983, MCTHOMAS & LPARKER, BLACKLIGHT TRAP” / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (either ♂ or ♀ handwritten behind species name on label) [yellow printed label] ( FSCA); 1 ♂, “ FLORIDA: Dade Co., Fuchs Hammock, 4–10-V-1988, H.V., Weems & Dickle, Flight trap” / “ Fornax , bicolor, Melsheimer, Det. M.C. Thomas 1995 ” (folded black framed white label; genus, species and author handwritten) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( FSCA); 1 ♂, “FLA.: DADE COUNTY, FUCH’S HAMMOCK, NEAR HOMESTEAD, 11–12-IV-1990 ” / “TERHUNE S. DICKLE, & H. V. WEEMS, JR., INSECT FLIGHT TRAP” /“ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( FSCA); 1 ♀, “ FLORIDA: Alachua Co., Gainesville, V-26–30-1991, Woolley & Zolnerowich” / “EUCNEMI- DAE:, Macraulacinae , Fornax , bicolor Mels., Det. R.L. Otto, 2005 ” (handwritten; folded) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♀ handwritten behind species name on label) [yellow printed label] ( TAMU); 2 ♂♂, “FL: Polk Co., Green Swamp WMA, 19 May–3 June 2001, Morris and Nigg, Malaise Trap” / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( GERP); 1 ♂ 1 ♀, “FL: Sumter Co., Green Swamp WMA, 3–15 June 2001, Morris and Nigg, Malaise Trap” / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (either ♂ or ♀ handwritten behind species name on label) [yellow printed label] ( GERP); 1 ♂, “Crescent, City Fla” / Coll Hubbard, & Schwarz” / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( USNM); 1 ♀. “Crescent, City Fla” / Coll Hubbard, & Schwarz” / “ Fornax , bicolor, Mels ” (black framed discolored white label; genus, species and author names handwritten; folded) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♀ handwritten behind species name on label) [yellow printed label] ( USNM); 1♂, “Enterprise, 22 6 Fla” (“22” handwritten) / “1618” (handwritten) / “bicolor 3” (handwritten) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( MCZ); LOUISIANA: 1 ♂, “La.” / “Henry Ulke, Beetle Coll., CMNH Acc., No. 1645” (typed; green label) / “ Fornax , bicolor, Mels. ” (handwritten) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( CMNH); 1 ♂, “14083P., Hopk US” (‘14083P’ handwritten; ‘H’ cut off on label) / “TESnyder, Colr” / “Adam Key, Fla” (handwritten) / “May 15–16” (handwritten) / “Red Man-, grove” (handwritten) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( USNM); MISSOURI: 1 ♀, “ 1 mi. E. Moberly Mo., Randolph Co., 18 July ‘76, Coll. E.G. Riley” (date handwritten) / “ Fornax , bicolor, (Mesh.) , J. Muona det.” (species and author handwritten) / “EGRC” (blue printed label) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♀ handwritten behind species name on label) [yellow printed label] ( EGRC); 1 ♀, “ 1 mi. E. Moberly Mo., Randolph Co., 21 July 76, Coll. E.G. Riley” / “EGRC” (blue printed label) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♀ handwritten behind species name on label) [yellow printed label] ( EGRC); TENNESSEE: 1 ♂, “Cumberland Co. Tenn, Crab Orchard, 52 July 6 1922, T.H. Hubbell” (‘52’ handwritten) / “ PARATYPE:, Fornax , convexicollis, Otto, Det. R.L. Otto, 2018 ” (♂ handwritten behind species name on label) [yellow printed label] ( FSCA). Paratypes are deposited in CMNH, EGRC, FSCA, GERP, MCZ and USNM.

Description. Male holotype. Length 10.0 mm. Width 3.0 mm. Body subcylindrical, elongate; uniformly dark brown; scape dark brown, pedicel and antennomeres III–XI reddish-brown; legs including tarsi dark reddishbrown; head, pronotum and elytra clothed with short, recumbent yellowish setae ( Fig. 13 ). Head: Subspherical; integument rugose, dull; frons convex, without median carina or fovea above frontoclypeal region; apical margin of frontoclypeal region rounded, about 2 times wider than base; delicate, horizontal interantennal carina present, but narrowly incomplete; mandibles stout, bidentate, densely punctate. Antenna: Filiform from antennomeres III–XI, attaining nearly 1/2 of body length; antennomere III slightly longer than IV; antennomere IV slightly shorter than V; antennomeres V–X each subequal, longer than wide; antennomere XI slightly longer than X. Pronotum: Integument dull, densely rugose to granulate; wider than long, with moderate, sharp hind angles; sides arcuate toward anterior; disc convex, with delicate, short, shallow median groove, without circular fovea; base sinuous, with pair of circular depressions above scutellar shield. Scutellar shield: Elongate, subtriangular, setose, shallowly punctate and distally rounded. Elytra: Distinctly striate; interstices slightly elevated; integument shiny, with dense punctures. Legs: First tarsomere presumably as long as combined lengths of remaining four on meso- and metatarsi; tibiae rounded in cross-section; metatarsomeres I–III simple; metatarsomere IV excavated; metatarsomere V presumably elongate, with basally toothed claws. Venter ( Fig. 14 ): Closely punctate, with elongate, recumbent yellowish setae; hypomeron with basally open, lateral antennal grooves; metepisterna parallel-sided; elytral epipleura shiny, grooved throughout, without punctures; metacoxal plates medially more than 6.0 times wider than laterally; last abdominal ventrite slightly produced apically, short and wide.

Female allotype ( Fig. 15 ). 11.0 mm long; antennae filiform, reaching nearly 1/2of body length; legs and antennae dark reddish-brown, similar to habitus; pronotum parallel-sided in basal half, narrowed anteriorly in apical 1/2; last abdominal ventrite obtuse.

Aedeagus (paratype) ( Fig. 16 ). Basal piece slightly longer than wide, parallel-sided, dorsally open, basally bifid; remaining parts elongate, slightly constricted laterally at base of parameres, apically lobed; median lobe short and stout, shorter than parameres, apically rounded, narrowly bifid; parameres elongate, apically less sclerotized, with a triangular lateral tooth near base.

Variation. Twelve male and six female paratypes were examined. The male paratypes are 8.0–10.0 mm long and 2.5–3.0 mm wide. The female paratypes are 10.0–11.0 mm long and 3.0 mm wide. Delicate interantennal carina is present in all paratypes, but is slightly indicated in six male and three female paratypes. Two male paratypes have a nearly complete, much strongly indicated interantennal carina above the base of frontoclypeal region. Female antennae are slightly longer than 1/3 of body length. Three males are lighter in color than the rest of the series, possibly teneral at the time of collection. There are no other exoskeletal differences between the paratypes and the holotype.

Distribution. This species is known from Missouri and Texas to Tennessee and Florida in south-central and southeastern United States.

Biology. Five specimens were taken from a Malaise trap. Three specimens were taken from a blacklight trap. One specimen was taken from a Lindgren funnel trap baited with Persea Miller (Lauraceae) . Two specimens were taken from a flight trap. One specimen was taken from a red mangrove ( Rhizophora mangle Linnaeus ; Rhizophoraceae ) forest on Adam Key in Florida. Developmental stages remain unknown.

Etymology. The specific name is derived from the curved shape of the pronotum, particularly its arcuate sides and convex pronotal surface.

Figures

Figures 13–16. Fornax convexicollis Otto, sp. nov. 13) Male holotype, dorsal habitus. 14) Male holotype, ventral habitus. 15) Female allotype, dorsal habitus. 16) Male paratype, aedeagus, dorsal view. (Scale: 13–16 = 1.0 mm.)