Geocharidius erwini, Sokolov, Igor M. & Kavanaugh, David H., 2014

Sokolov, Igor M. & Kavanaugh, David H., 2014, The integripennis species group of Geocharidius Jeannel, 1963 (Carabidae, Bembidiini, Anillina) from Nuclear Central America: a taxonomic review with notes about biogeography and speciation, ZooKeys 443, pp. 61-118 : 76

Taxon classification Animalia Coleoptera Carabidae

Geocharidius erwini sp. n. Figs 2A, 3B, 5A, 6C, I, 12E, 13 D–F, 16B, 17B, 22

Geocharidius integripennis , Sokolov, 2013:53

Type material.

HOLOTYPE, a male, in NMNH, glued on cardboard, labeled: \ Guatemala: QUICHÉ, 7km NE Los Encuentros, 2400m, 18.XI.1991 leg. R.Baranowski \ sifting litter under bushes at roadside pine forest \ Loan from USNMNH 2051867 \ HOLOTYPE Geocharidius erwini Sokolov and Kavanaugh 2014 [red label] \. PARATYPES: A total of 45 specimens (4 males and 4 females were dissected), deposited in CAS, CMNC, NMNH; 23 specimens labeled same as holotype; 10 specimens labeled: \ Guatemala: QUICHÉ, 7km NE Los Encuentros, 2400m, 14.XI.1991 leg. R.Baranowski \ sifting litter under bushes at roadside pine forest \ Loan from USNMNH 2051867 \; 8 specimens labeled: \ Guatemala QUICHÉ, 6km S Chichicastenango, 2140m. 16.XI.1991 leg. R.Baranowski \ sifting litter, pine-oak forest \ Loan from USNMNH 2051867 \; 4 specimens labeled: \ Guatemala: QUICHÉ, 5km S Chichicastenango, 2000m. 18.XI.1991 leg. R.Baranowski \ sifting litter, pine-oak forest \ Loan from USNMNH 2051867 \; 1 specimen labeled: \ Guat.: QUEZALTEN. 12km S.E. Zunil, Fuentes Georginas, 2460m, 21.VI.1993, R. Anderson, cloud for. litter 93-10A\ CMNC \; 1 specimen labeled: \ Guat.: QUEZALTEN. 12km S.E. Zunil, Fuentes Georginas, 2460m, 21.VI.1993, R. Anderson, cloud for. litter 93-10E\ CMNC \; 1 specimen labeled: \ Guat.: QUEZALTEN. 12km S.E. Zunil, Fuentes Georginas, 2450m, 19.VI.1993, R. Anderson, cloud for. litter 93-5CC \ CMNC \; 1 specimen labeled: \ Guat.: QUEZALTEN. 12km S.E. Zunil, N.W.face Cerro Zunil, 2700m, 20.VI.1993, R. Anderson, hardwood for. litter 93-8F \ CMNC \; 1 specimenslabeled: \ Guat.: QUEZALTENANGO: 12km SE Zunil, NW face Cerro Zunil, hardwd.for.litter, 2700-2760m, R. Anderson 91-30 28.V.1991. \ CMNC \.

Type locality.

Guatemala, Quiché Department, 7 km NE of Los Encuentros.

Etymology.

The specific epithet is a Latinized eponym in the genitive case and is based on the surname of Terry L. Erwin, Curator of Entomology at the Smithsonian Institution, United States National Museum of Natural History, Washington, D. C., U.S.A., the first reviser of the Guatemalan Anillina.

Recognition.

Adults of this new species are practically indistinguishable from those of other the Guatemalan species of Geocharidius with small body size. Males and females of Geocharidius erwini are distinguished from those of the other members of the integripennis species group by the structure of the median lobe of males and the shape of spermatheca of females, respectively.

Description.

Size. Small to medium for genus (SBL range 1.16-1.31 mm, mean 1.23 ± 0.057 mm, n=30).

Habitus. Body form (Fig. 12E) moderately convex, elongate ovoid, general proportions (WE/SBL 0.38 ± 0.009) and proportions of head (WH/WPm 0.72 ± 0.012) and pronotum (WPm/WE 0.79 ± 0.015) average for group.

Color. Body rufotestaceous, appendages testaceous.

Microsculpture. Mesh pattern of irregularly isodiametric sculpticells present over all dorsal surfaces of head and elytra. Pronotum smooth. Proepisternum with evident microsculpture.

Mouthparts. Labium (Fig. 5A).

Prothorax. Pronotum moderately transverse (WPm/LP 1.26 ± 0.019), with lateral margins slightly constricted posteriorly (WPm/WPp 1.31 ± 0.025). Posterior angles slightly obtuse (100-110°). Widths between anterior and posterior angles of equal length (WPa/WPp 1.01 ± 0.025). Ventral aspect (Fig. 3B).

Elytra (Fig. 2A). Moderately convex, slightly depressed along suture, moderately wide (WE/LE 0.67 ± 0.017), without traces of striae. Humeri rounded, in outline forming right angle with longitudinal axis of body. Lateral margins convex, evenly divergent at basal third, evenly rounded to apex in apical third.

Legs. Protibia (Fig. 6I). Protarsus (Fig. 6C).

Male genitalia. Median lobe (Fig. 13D) with shaft moderately long, slightly widened apically, and apex small and rounded. Ventral margin almost straight. Dorsal sclerites of internal sac (Fig. 13D) in form of a long fig, tapered apically as a long flagellum, and gradually widen towards semicircular basal end extended basally through the basal orifice. Right paramere with short and wide apical consriction (Fig. 13F). Left paramere with long and moderately narrow apical constriction (Fig. 13E). Ring sclerite with almost rectangularly rounded, subparallel, handle (Fig. 16B).

Female internal genitalia. Spermatheca sclerotized, fusiform with bulb enlargement apically, twice bent rectangularly in opposite directions, with cornu long and nodulus short (Fig. 17B). Length of spermathecal gland less than length of spermatheca. Spermathecal duct coiled.

Geographical distribution.

This species is known from a few scattered localities in the Quiché and Quetzaltenango Departments of Guatemala (Fig. 22, green circles).

Way of life.

Specimens were collected by sifting litter from different habitats: cloud, hardwood, pine and pine-oak forests at elevations of 2140-2760 m.

Relationships.

The shape of dorsal sclerites of the internal sac in males suggests a remote relationship with Geocharidius minimus (Fig. 13G), described below.