Agathidium recurvatum Miller and Wheeler, 2005

MILLER, KELLY B. & WHEELER, QUENTIN D., 2005, Slime-Mold Beetles Of The Genus Agathidium Panzer In North And Central America, Part Ii. Coleoptera: Leiodidae, Bulletin of the American Museum of Natural History 2005 (291), pp. 1-167 : 119-120

Agathidium recurvatum Miller and Wheeler , new species Figures 146 , 267–269 , 366

TYPE MATERIAL: Holotype, Ƌ in CMNC labeled ‘‘ MEX.: OAX .; 3 mi N Suchixtepec , 9500̍ 4.vi.1971 S.Peck Ber 209, oak litter/ HOLOTYPE Agathidium recurvatum Miller and Wheeler, 2003 [red label with black line border]’’ .

TYPE LOCALITY: Mexico, Oaxaca, 3 mi N Suchixtepec, 9500̍.

DIAGNOSIS: This species is similar to A. aztec and related species in having a small, subapical male metafemoral tooth (fig. 146), but differs in having relatively smaller eyes with somewhat larger facets, more well­developed oblique metasternal carinae which meet medially in a moderately developed triangular lobe and the male genitalia. The median lobe in lateral aspect is apically slender, long, and sharply recurved at the apex (fig. 268). This species is similar to A. oculeum but has smaller eyes and that species has a very broad, rounded operculum (fig. 264) whereas that of A. recurvatum is smaller and more slender (fig. 267). This species is also similar to A. stenomma (including the shape of the male genitalia); however, that species has eyes that are very strongly dorsoventrally compressed (fig. 109).

DESCRIPTION: Body moderate in size (TBL = 2.68–3.82 mm), broad, robust (PNW/TBL = 0.44–0.48), strongly contractile.

Head dark red­brown to piceous; pronotum dark red­brown to piceous, red around margins; elytra red­brown to piceous, red around margins, not iridescent; venter, antennae, palpi, and legs red­brown.

Head broad (MDL/OHW = 0.52–0.63), dorsal surface flattened, dorsoventrally com­ pressed; with very fine punctures, each with a short, very fine seta, surface between punctures shiny, smooth; frontoclypeal suture obsolete medially; eyes moderately large, but distinctly dorsoventrally compressed; gula slightly concave; antennomere ratios: length I:II:III = 1.8:1.0:1.9, width VII:VIII:IX = 1.0:1.0:1.5. Pronotum very large, broad (PNL/PNW = 0.73–0.83), strongly convex, anterolateral lobes strongly produced, lateral margin broadly curved, not angulate; with very fine, sparse punctures, each with a short, very fine seta, surface between punctures smooth. Elytra broad, lateral margins strongly rounded, apically rounded (SEL/ELW = 0.93–1.11); punctation similar to pronotum; sutural stria absent. Flight wings strongly reduced. Mesosternum broad, flattened; medial carina well developed. Metasternum narrow (MTL/MTW = 0.14–0.22), flattened, sloping dorsad anteriorly; oblique femoral carinae moderately prominent laterally, medially meeting in moderately prominent, posteriorly directed lobe.

Male tarsi 5­5­4; pro­ and mesobasotarsomeres slightly laterally expanded, with small field of ventral spatulate setae; mandibles not modified; metafemur moderately broad with broad, moderately large tooth subapically on posterior margin (fig. 146); metasternal fovea moderately large, rounded with moderately large pencil of long, dense, fine setae. Median lobe in lateral aspect slen­ der basally, strongly curved, expanded submedially, with prominent dorsal prominence, apical portion elongate triangular, apex abruptly recurved and sharply pointed (fig. 268); in ventral aspect slender, long, lateral margins broadly sinuate, apical portion evenly narrowed to slender, sharply pointed apex (fig. 267); operculum flat, long, relatively slender, apex emarginate, each ramus narrowly rounded (fig. 267); lateral lobes slen­ der, evenly curved through much of length, apically strongly sinuate and slightly broadened, apex rounded with 2 stout setae (fig. 269).

Female tarsi 5­4­4.

ETYMOLOGY: This species is named recurvatum after the prominently recurved apex of the median lobe in lateral aspect.

DISTRIBUTION: This species is known only from the states of Mexico and Oaxaca (fig. 366).

PARATYPES: MEXICO: Oaxaca: 23 km N Oaxaca City , 12 Sep 1994, 2650 m, under bushes at roadside, mixed pine forest, R Baranowski (13, JRAC) ; 26 km S Yolomecatl , 10 Aug 1988, Doyen and Stockwell (1, EMEC) ; 17 km N Villa Diaz Ordaz , 5 Sep 1994, 2750 m, pine oak forest litter, R Baranowski (5, JRAC) ; 40.5 km S Suchixtepec , 25 Jul 1992, 1300 m, cloud forest, leaf litter, Berlese, RS Anderson (2, CNCI) ; 64.5 km SW Valle Nacional km 117.5, 28 Jul 1992, 2600 m, oak forest leaf litter, Berlese, RS Anderson (3, CNCI) ; 5.1 km S Suchixtepec , 25 Jul 1992, oak­alder­pine forest leaf litter, Berlese, RS Anderson (7, CNCI) ; 4.6 km S Suchixtepec , 23 Jul 1992, 2150 m, wet riparian alder forest leaf litter, Berlese, RS Anderson (7, CNCI) ; 3.5 mi S Suchixtepec , 3 Jun 1971, 8000̍, leaf litter, S Peck (4, PECK) .

DISCUSSION: This species has been collect­ ed from litter from various forest types including pine, oak, alder, and wet riparian forest.

Agathidium impensum Miller and Wheeler ,

Figures

Figs. 145–172. Agathidium oniscoides­group species, left male metafemur, ventral aspect: 145, A. oculeum. 146, A. recurvatum. 147, A. impensum. 148, A. cheneyi. 149, A. tenangoense. 150, A. rumsfeldi. 151, A. hirsutum. 152, A. cortezi. 153, A. tumidiventre. 154, A. aztec. 155, A. iridescens. 156, A. dentigerum. 157, A. stephani. 158, A. akrogeneios. 159, A. appalachium. 160, A. pocahontasae. 161, A. carolinense. 162, A. gallititillo. 163, A. divaricatum. 164, A. bushi. 165, A. georgiaense. 166, A. chauliodoum. 167, A. microphthalmum. 168, A. nimbosilva. 169, A. oniscoides. 170, A. rubellum. 171, A.

Figs. 261–287. Agathidium oniscoides­group species, aedeagus: 261–263, A. oaxacaense: 261, ventral; 262, median lobe, lateral; 263, left lateral lobe, lateral. 264–266, A. oculeum: 264, ventral; 265, median lobe, lateral; 266, left lateral lobe, lateral. 267–269, A. recurvatum: 267, ventral; 268, median lobe, lateral; 269, left lateral lobe, lateral. 270–272, A. impensum: 270, ventral; 271, median lobe, lateral; 272, left lateral lobe, lateral. 273–276, A. cheneyi: 273, ventral; 274, median lobe, apex, ventral; 275, median lobe, lateral; 276, left lateral lobe, lateral. 277–279, A. tenangoense: 277, ventral; 278, median lobe, lateral; 279, left lateral lobe, lateral. 280–283, A. rumsfeldi: 280, ventral; 281, median lobe, apex, ventral; 282, median lobe, lateral; 283, left lateral lobe, lateral. 284–287, A. hirsutum: 284, ventral; 285, median lobe, apex, ventral; 286, median lobe, lateral; 287, left lateral lobe, lateral.

Figs. 365, 366. Geographic distribution of Agathidium oniscoides­group species: 365, A. andersoni = -; A. disgregum = ^; A. invisitatum = •; A. oaxacaense = *. 366, A. impensum = *; A. oculeum = •; A. recurvatum = -; A. cheneyi = ^.