Macrelmis bispo, Barbosa, Felipe Francisco, Fernandes, André Silva & Oliveira, Leandro Gonçalves, 2013

Barbosa, Felipe Francisco, Fernandes, André Silva & Oliveira, Leandro Gonçalves, 2013, Three new species of Macrelmis Motschulsky, 1859 (Coleoptera: Elmidae: Elminae) from the Brazilian Cerrado Biome with updated key for the Macrelmis of Brazil, Zootaxa 3736 (2), pp. 128-142 : 130-132

Macrelmis bispo sp. nov.

( Figs 2–5 )

Diagnosis. 1) body sub-parallel, robust ( Figs 2, 3 ); 2) pronotum slightly wider (1.32 mm) than long (1.12 mm); 3) pronotum with median longitudinal impression inconspicuous and shallow, extending from apical 1/4 to middle; 4) pronotum with sublateral carinae extending along almost entire length, but not reaching base nor anterior margin; 5) pronotum with median, rounded to obovate, gibbosity near base, with half the length of scutellum; 6) elytra with intervals slightly convex at base, seventh interval carinate at apex; 7) elytral apex slightly to moderately rounded; apices together forming a feebly angulated V-shape structure.

Description: Holotype: male. Length 3.6 mm, maximum width 1.52 mm (across apical 1/4 of elytra), pronotal length 1.12 mm, elytral length 2.48 mm. Body sub-parallel, robust.

Color: cuticle black to dark brown, except for: ventral region of the head, trochanter, femur and tibia of all legs dark brown; tarsal claws, tarsomeres, antennae, maxilla, labium, maxillary palpus and labial palpus which are light brown.

Head: without distinct impressions. Dorsal cuticle densely granulate. Eyes slightly protuberant, laterally rounded, separated by twice the diameter of eye. Antenna 11-segmented, filiform; last segment elongate with subtriangular apex, about as long as first two segments combined, and approximately 1.5–2 times as long as each of the segments 3–10. Labrum sub-rectangular, with fine golden setae; anterior angles rounded with yellowish moderately fine golden setae. Clypeus sub-rectangular, covered with fine golden setae. Frontoclypeal suture distinct. Frons granulate. Maxillary palpus with last segment rounded, longer than remaining segments combined. Labial palpus with last segment rounded, longer than remaining segments combined.

Thorax ( Figs 2, 3 ): pronotum slightly wider (1.32 mm) than long (1.12 mm), punctuate and granulate, covered with silver-golden setae; median longitudinal impression very inconspicuous and shallow, extending from basal 2/ 5 to apical 1/5; sublateral carinae extending along almost entire length, not reaching base nor anterior margin, very broad and strongly raised, feebly sinuate; anterior angles sharp and slightly produced; anterior margin broadly rounded, finely protruding over head; lateral margin finely crenate; rounded to obovate median gibbosity, near base, half as long as scutellum. Hypomeron granulate. Elytra 2.48mm long, 1.52 mm wide; granulate; intervals slightly convex at base; lateral margin sub-parallel in basal two thirds, then converging strongly to apex; lateral margin crenate; humeral angle broadly rounded and feebly entumed; without carinae; accessory stria 1/5 as long as elytra; apex slightly or moderately rounded forming broadly rounded angle, not acute; apices together forming a feebly angulated V-shape structure. Epipleura granulate. Scutellum strongly convex, with angles rounded, slightly longer (0.20 mm) than wide (0.15 mm), oval to sub-oval, with few sparse punctures with same diameter as facets. Prosternum wider (0.87 mm) than long (0.72 mm), granulate, anterior margin truncate; sublateral carinae present from base to almost anterior margin; with moderate median transversal depression. Prosternal process 1.5 times longer (0.84 mm) than wide (0.56 mm), widest at base, distinctly elevated, densely granulate, extending beyond front coxae; apical and lateral margins feebly elevated and smooth, with distinct preapical constriction; apex triangular to sub-triangular. Mesoventrite between mesocoxae wider (1.00 mm) than long (0.32 mm); with deep median groove for reception of prosternal process; lateral margin of mesoventrite elevated and granulate. Metaventrite three times as long as mesoventrite, densely granulate; median groove extending from near posterior to near anterior margin. Legs thin and straight granulate. Tibiae with apical fringes of tomentum, front tibiae with one anterior fringe extending from apical middle almost to apex; middle tibiae with two fringes, one anterior, extending from apical middle almost to apex and one posterior, extending from apical 2/3 almost to apex; hind tibiae with one posterior fringe, extending from apical 2/3 almost to apex. Middle and hind trochanter entumed. Interior side of hind coxae, near the base of hind trochanter, with erect tuff of golden setae.

Abdomen ( Figs 2, 3 ): length 1.4 mm, width 1.48 mm (along ventrite I). Ventrites densely and finely granulate except: basomedial 2/3 of ventrite I, coarsely granulate; apicomedial 1/3 of ventrite I and basomedial 3/4 of ventrite II punctuate, basomedial sub-triangular region and apical region of ventrite V. Ventrite V with posterolateral projections produced to about posterior 3/4 of ventrite; apex rounded with moderately short setae.

Genitalia ( Figs 4, 5 ): parameres, in dorsal view, elongate, gradually tapering from base to apex, extending to apical 4/5 of penis, with apex rounded and inner margin excavate subapically. Penis, in dorsal view, elongate, gradually tapering from base to apex, slightly wider than paramere, apical 1/4 sub-capitate, with apex rounded. Phallobasis, in dorsal view, tapering gradually from apex to base, about 3/4 as long as penis, base diagonally excavated at right side; in lateral view, basally truncate, sub-parallel.

Plastron ( Figs 2, 3 ) gold-silver, present on gena, proepisternum, proepimeron, hypomeron, mesoepisternum, mesoepimeron, lateral sides of prosternum, metaepisternum, lateral sides of metaventrite, lateral sides of hind coxae, whole femora (except apices), protrochanters and epipleura. Plastron on meso- and meta-trochanters very sparse to almost absent. Plastron present on ventrites, except disc of ventrite I and median narrow stripe on ventrite II.

Female. Externally similar to male.

Intraspecific variation. Size variation (N = 8): length 3.5–4.6 mm. The specimens examined showed no significant morphological variation.

Taxonomical note. Macrelmis bispo sp. nov. can be considered as member of the granigera species group (Hinton 1945, 1946; Manzo 2003; Monte & Mascagni 2012; Sampaio et al. 2012) based on combination of the following characters: 1) obovate gibbosity near the middle of pronotal base, and 2) elytral apex slightly to moderately rounded, apices together forming V-shape structure. Moreover, male genitalia of Macrelmis bispo sp. nov. resemble that of all species of the granigera group.

Type locality. BRAZIL: Goiás (GO): Pirenópolis: Córrego Vagafogo, 15°48'16.7''S, 49°21'18.6''W.

Type series. Holotype: 1 male, Pirenópolis, GO, Córrego Vagafogo, 15°48'16.7''S, 49°21'18.6''W, A. S. Fernandes, 22/VI/2010, aquatic sampling nets (2,0 mm mesh) (CELAMARH). Paratype: 1 male, same data as holotype (CELAMARH); 2 female, Jaraguá, GO, 15°48'16.7''S, 49°21'18.6''W, A B. S. Godoy,?/VIII-X/2008, aquatic sampling nets (2,0 mm mesh), litter submerged (CELAMARH); 3 female, same data as holotype (MZUSP); 1 ex., Morro Agudo de Goiás, GO, 15°25'23''S, 49°51'41.5''W, B. S. Godoy,?/VIII-X/2008, aquatic sampling nets (2,0 mm mesh), rocks (MZUSP).

Habitat note. Two individuals of Macrelmis bispo sp. nov. were labeled as collected in submerged litter, the remaining ones didn’t show such data. All specimens were collected in first and second order streams.

Etymology. The specific epithet bispo (there is no graphical change in the surname “ Bispo ”, declined in the Latin dative mode) is in honor to Dr. Pitagoras da Conceição Bispo (Universidade Estadual Paulista Júlio de Mesquita Filho; Faculdade de Ciências e Letras de Assis; Assis–SP, Brazil) in recognition for his contributions to the study of aquatic insects of Brazil.

Distribution. The species is known only from Goiás State (GO).

Figures

FIGURES 2 – 5. Macrelmis bispo sp. nov. (male Paratypus): 2) habitus, dorsal view; 3) habitus, ventral view; 4) male genitalia, dorsal view; 5) male genitalia, lateral view. Scale: 1.0 mm (2, 3), 100 µm (4, 5).