Mizotrechus poirieri, Erwin, 2011

Erwin, Terry L., 2011, Rainforest understory beetles of the Neotropics, Mizotrechus Bates 1872, a generic synopsis with descriptions of new species from Central America and northern South America (Coleoptera, Carabidae, Perigonini), ZooKeys 145, pp. 79-128 : 101-102

Poirier's trough beetle Mizotrechus poirieri sp. n. Figs 17 36 40

Holotype.

GUYANE, Saut Pararé, Arataie River, Nouragues Field Station, 51 m, 4.0378°N, 52.6725°W, 30 November 2009 (S Brule, PH Dalens, & E Poirier)(NMNH: ADP124888, male).

Derivation of specific epithet.

The epithet “poirieri” is an eponym, based on the family name of E. Poirieri, whose team in Guyane has been collecting beetles using Flight Intercept Traps and capturing adults of many new species, such as this one.

Proposed English vernacular name.

Poirier’s trough beetle.

Diagnosis.

With the attributes of the genus as described above and medium sized for the genus as it is presently understood; adults have castaneous integument, except anterior parts of mandible, baso-lateral corner of labrum, and clypeal suture piceous. Frons with evident rugae, punctulate. Occiput with evident rugae, punctulate. Pronotum nearly quadrate with lateral margins slightly emarginate to hind angle, hind angle about right, not dentate; base sparsely rugulose. Elytra broad and short, much wider than the width of pronotum across anterior third, and with only interneur 1 deeply engraved, 2-8 evident yet shallowly impressed, not punctate; margins behind humeri entire. Foreleg femur with slightly produced swelling on postero-ventral margin.

Description.

( Figs 17 , 36 ). Size: See Appendix 1. Medium sized for the genus, ABL = 6.6 mm, SBL = 5.65 mm, TW = 2.42 mm. Color: see diagnosis, above. Luster: Head, pronotum, and legs shiny, elytra duller due to shallowly engraved slightly stretched microsculpture. Head: Labrum quadrate and apico-medially emarginate. Eye large, moderately convex. Gena moderately long, straight. Frons, occiput, and gena glabrous. Prothorax: Narrow, quadrate, narrowed slightly toward base, margins slightly emarginated before hind angle, angle about right, not dentate, margin moderately e xplanate except wider at hind angle; surface punctulate, punctures widespread, glabrous. Pterothorax: Elytron moderately convex, disk flat, intervals flat, interneurs not punctate, apex markedly oblique and straight, sutural apex narrowly rounded. Metasternum sparsely setiferous in male. Legs: Normal in male; foreleg femur (as in Fig. 20 ) with a minute setose tooth on postero-ventral margin, subdentate; posterior trochanter narrowly acute at apex, about half the length of the femur. Abdomen: Abdominal sterna moderately setiferous; sternum IV of male with narrow and dense patch of decumbent setae. Male genitalia: Median lobe ( Fig. 36 ) elongate and robust with ostium moderately elongate, over half the length of the median lobe; apex a losp. n.tulate distal end that is more bent ventrad than in Mizotrechus dalensi , moderately curved in lateral aspect, ventral margin proximal to apex straight then evenly curved to apex; endophallus with complexly folded tracheal fields; phallobase hooded and crested, opening more or less 20 degrees off axis of shaft. Parameres large, left a third longer than the right, both broadly rounded, asetose. Female genitalia: Unknown.

Dispersal potential.

These beetles are macropterous and capable of flight. They are moderately swift and agile runners.

Way of life.

The adult holotype was collected in a flight intercept trap in the rainforest understory. Adults are active in November, at the end of the dry season.

Other specimens examined.

None.

Geographic distribution.

( Fig. 40 ). This species is currently known only from the type locality in the lowlands of Guyane.

Figures

Plate 5. Digital Photo-illustrations, habitus, dorsal aspect: 17 Mizotrechus poirieri sp. n., ABL = 6.6 mm, male holotype, ADP 124888; type locality. 18 Mizotrechus woldai sp. n., dorsal aspect, ABL = 7.4 mm, female holotype, ADP 124946; type locality.

Plate 6. Digital Photo-illustrations, anterior femur, ventral aspect: 19 Mizotrechus minutus sp. n., ADP 124966; type locality. 20 Mizotrechus dalensi sp. n., ADP 124896; type locality. 21 Mizotrechus chontalesensis sp. n., ADP 127181; type locality. 22 Mizotrechus edithpiafae sp. n., ADP 124948; type locality. 23 Mizotrechus brulei sp. n., ADP 129205; type locality. 24 Mizotrechus gorgona. sp. n., ADP 128622; type locality.

Plate 10. Digital Photo-illustration, male genitalia, median lobe, left lateral, dorsal, and right lateral aspects: 34 Mizotrechus minutus sp. n., ADP 124902; type locality. 35 Mizotrechus neblinensis sp. n., ADP 124944; type locality. 36 Mizotrechus poirieri sp. n., ADP 124888; type locality.

Figure 40. Distribution symbol map for known localities of Mizotrechus batesi, Mizotrechus bellorum, Mizotrechus belvedere, Mizotrechus brulei, Mizotrechus dalensi, Mizotrechus grossus, Mizotrechus marielaforetae, Mizotrechus minutus, Mizotrechus poirieri, Mizotrechus neblinensis, spp. n.