Callosides mafik, Král & Hájek, 2014

Král, David & Hájek, JiĜí, 2014, A new Callosides species from Ecuador with uniquely built membranous mandibles (Coleoptera: Hybosoridae: Anaidinae), Acta Entomologica Musei Nationalis Pragae 54 (1), pp. 237-242 : 238-241

Callosides mafik sp. nov.

( Figs 1–8 )

Type locality. Ecuador, province Napo, 1.3 km SW of Baeza, 77°53ƍ46ƍƍ W 00°28 ƍ34ƍƍ S, 2050 m.

Type material. HOLOTYPE: J, ‘ ECUADOR, prov. Napo (2) / 1.3 km SW of BAEZA, 2050m / S 00°28 ƍ34ƍƍ W 77°53 ƍ46ƍƍ / 11.xi.2006, M. Fikáþek & / J. Skuhrovec lgt. // dense bush of Chusquea close / to stream with few solitary trees / near pasture & moss and leaves / on slope above road (sifting) [printed] . PARATYPES: 2 JJ: same data as holotype.

Description of holotype. Integument dark brown to black, moderately shiny; dorsal surface remarkably areolate, in places covered with short, stout, dense, erect, clavate macrosetation ( Figs 1–2 ).

Head with dense areolate-ocellate sculpture, meshes simple, slightly different in size and shape (circular, oval, angular), each with setigerous puncture; each puncture with short, erect, clavate macroseta; head integument through macrosetae almost invisible. Clypeus with ogival outline, almost flat, margins slightly upturned. Vertex very weakly convex dorsally, disc shallowly depressed longitudinally. Genae small, regularly rounded, distinctly separated from clypeus by short oblique clypeo-genal suture above eyes. Eyes small, visible in dorsal aspect; eye canthus absent. Antennae decamerous, with trimerous club; scapus stout, clavate, distinctly strigate longitudinally, with several long, erect macrosetae on anterior edge; antennomeres 2–5 moniliform, pedicellus larger than each of antennomeres 3–5, antennomeres 6–7 transverse, antennomere 8 not cupuliform. Labrum smooth, flat, anterior margin slightly sinuate. Epipharynx sclerotized, rounded anterior margin with ¿ne, dense macrosetation; medial longitudinal process present; tormae with double row of long, close macrosetation. Mandibles pyramidal, not protruding beyond outline of clypeus (therefore invisible in dorsal aspect); pars basalis well sclerotised, with large conjunctive, mycangium absent; pars apicalis only partly sclerotised (this part is concave ventrally, with two long macrosetae on outer margin), mesal part (prostheca?) largely membranous, on scissorial (messal) edge with long microtrichia ( Fig. 3 ). Maxilla with remarkably large membranous galea. Maxillary palps tetramerous, ultimate palpomere elongate, approximately as long as palpomeres 2–3 combined. Labium strigate ventrally, bilobed apically. Labial palps tetramerous.

Pronotum large, transverse, sides explanate laterally, with two foveae along sides – posterior fovea larger and deeper, occupying two thirds of pronotal length, anterior fovea smaller and shallower, stretching in anterior third. Pronotum thickened in narrow, distinctly serrate lateral bead; outline of anterior corners acuteangular, lateral margins regularly broadly rounded to abruptly constricted posterior angles; disc weakly convex, with indistinct longitudinal flat depression medially; surface with closely areolate-ocellate sculpture, meshes rather small and simple on disc, larger and nearly double (with indicated second concentric contour) laterally, meshes slightly different in size and shape (circular, oval, angular), each with setigerous puncture; each puncture with short, erect, clavate macroseta ( Fig. 4 ); pronotal integument through macrosetae almost invisible, especially laterally.

Scutellar shield minute, triangulate, smooth, moderately shiny, concealed under tuft of yellow, recumbent macrosetae.

Elytra coalescent, nonstriate. Almost flat area of disc delimited laterally by longitudinal carinae arising near basis of humeral teeth; humeral tooth considerable, triangulate, acute apically; surface laterally of longitudinal carina abruptly declivous to smooth sharp epipleural carina; epipleuron narrow reaching from humerus to elytral apex; lateral margin regularly rounded, smooth; basal outline between humeral teeth bisinuate; approximately posterior fourth of elytral length abruptly declivous. Discal flat area with two short longitudinal swellings near basis and four small tubercles arranged zig-zag on each elytron; lateral declivous area with two tubercles on each elytron; posterior declivous area (posteriorly of longitudinal carinae) with six large, distinctly prominent tubercles, three on each elytron. Elytron surface with closely areolate-ocellate sculpture, small meshes usually simple, large meshes double (from two concentric contours), distinctly different in size and shape (circular, oval, angular) ( Fig. 5 ); setigerous punctures bearing short, erect, clavate macroseta concentrated mainly on carinae and lateral margin (closely contiguous rows), lateral and posterior tubercles (clusters), discal tubercles (each with tuft of macrosetae posteriorly of small impunctate shiny area) and to humeral area of disc (setae possibly scraped from larger area of disc).

Metathoracic wings vestigial, reduced to single narrow strut, slightly shorter than elytron length, venation absent, posterior edge membranous ( Fig. 6 ).

Prosternum biconcave, shiny, ¿nely strigate, with two distinct longitudinal carinae between external anterior edge of procoxa to ventral edge of anterior angle. Meso- and metaventrite small, flat, shiny, ¿nely concentrically strigate. Coxae small, contiguous. Femora alutaceous, ¿nely chagreened, with sparse, irregularly spaced, long, erect macrosetae and short, fusiform to clavate macrosetae in between.

Profemur with slightly grooved anterior edge. Protibia slender, alutaceous with narrow longitudinal shiny strip, with two very close apical teeth and with one large tooth and row of ¿ve or six teeth along outer margin; ventromedial edge with row of small denticles; apical spur lightly curved inward in distal half, widely truncate apically. Meso- and metatibia slender, alutaceous, their outer edge with longitudinal double row of small carinate denticles, each denticle with long, erect macroseta basally, apical edge fringed with row of short spinules equal in length. Protarsomeres moniliform, densely macrosetaceous on inner edge; meso- and metatarsomeres more elongate, densely macrosetaceous on inner edge, basimeso- and basimetatarsomere with several small denticles on inner edge. Claws simple, regularly curved, acute apically.

Abdominal ventrites moderately shiny, concentrically strigate, sparsely macrosetaceous, macrosetae narrowly fusiform, recumbent.

Male genitalia ( Figs 7–8 ). Parameres symmetrical, shorter than phallobasis, quadrilobate, reminiscent anchor in dorsal aspect; dorsal lobes narrow, rounded apically; ventral lobes large, hooked basally, angulate apically.

Measurements. Total body length: 5.2–5.3 mm (holotype 5.3 mm); maximum body width: 2.4–2.5 mm (holotype 2.5 mm). Variability. Both paratypes show slight individual variations in size, shape and situation of elytral tubercles and furthermore in places lacking close, clavate macrosetation of the dorsal surface, more so than in the holotype, clearly related to wearing. Differential diagnosis. Callosides mafik sp. nov. clearly differs from all three known species in the following characters: – presence of short, clavate, macrosetation of the dorsal surface (macrosetation simple or fusiform in all other species ( HOWDEN 1971: Fig. 11, PAULIAN & CAMBEFORT 1995: Fig. 1 ); – dorsal surface of the head and pronotum without distinct tubercles ( Figs 1–2 ) (dorsal surface of the head and pronotum with tubercles in C. bartolozzii ( PAULIAN & CAMBEFORT

1995: Fig. 1 ) and C. genieri ( HOWDEN 2001: Fig. 1 ) or tubercles only on the pronotum in

C. campbelli ( HOWDEN 1971: ¿g. 11)); – elytral discal area with two short, longitudinal swellings near base and four small tubercles arranged zig-zag on each elytron; lateral declivous area with two tubercles on each elytron;

posterior declivous area with six large, prominent tubercles, three on each elytron ( Fig. 1 )

(con¿guration of elytral tubercles different ( HOWDEN 1971: Fig. 11, 2001: Fig. 1 ; PAULIAN

& CAMBEFORT 1995: Fig. 1 ), see also key to Callosides species identi¿cation in OCAMPO

(2006: 70), for details); – different shape of apical part of aedeagus, compare Figs 7–8 with HOWDEN (2001: Figs

6–11). Etymology. The new species is dedicated to our colleague and friend Martin Fikáþek (National Museum, Prague, Czech Republic), an outstanding student in water beetles and co-collector of the type material. The speci¿c epithet presents Martin’s nickname ‘Ma¿k’ resulting from his name (Martin Fikáþek); noun in apposition. Collecting circumstances. All three type specimens were sifted from leaf and moss litter in dense bush of the bamboo Chusquea Kunth (Poaceae) close to a stream on the slope above a road covered with a few solitary trees near pasture. Distribution. So far known only from the type locality in the Napo province, Ecuador.

Figures

Figs 1–8. Callosides mafik sp. nov. 1 – habitus of holotype in dorsal view; 2 – habitus of holotype in lateral view; 3 – left mandible; 4 – detail of pronotal sculpture; 5 – detail of elytral sculpture; 6 – metathoracic wing; 7 – apical part of aedeagus in lateral view; 8 – apical part of aedeagus in dorsal view. Scale bar (Figs 3, 6–8) = 0.5 mm.