Hexacylloepus ubirajarai, Polizei & Barclay & Bispo, 2020

Polizei, Thiago T. S., Barclay, Maxwell V. L. & Bispo, Pitágoras C., 2020, Hexacylloepus Hinton, 1940 rises again; 18 new species of a neglected genus (Coleoptera: Byrrhoidea: Elmidae), Zootaxa 4819 (1), pp. 6-48 : 42-44

Hexacylloepus ubirajarai sp. nov.

( Fig. 17 A–C)

Type locality: Brazil, Minas Gerais State, Sete Lagoas .

Diagnosis: Antennae with thin setae at apex of each antennomere. Frontoclypeal suture concave. Pronotum with a long, wide and deep longitudinal impression on disc, reaching the anterior and posterior margins. Hypomera with a belt of tomentum reaching the anterior and lateral margins. Epipleura without tomentum. Tibiae each with a row of spines and setae on distal half. Abdomen with the disc of the first ventrite without tomentum, and a pair of carinae extending towards and reaching the metaventrite. Male genitalia with the phallobase moderately longer than wide; parameres reaching 3/4 of the penis length; 3x as wide at base than at apex, apex sharp; penis wide with lateral margin sinuous, and apex rounded, nearly irregular semicircular at apical 1/3.

Description: Male. Body elongated, subparallel. Antenna, mouthparts and legs yellow coloured, with head reddish-brown. Total length: 1.57 mm. Greatest width: 0.77 mm.

Head: surface with micropunctures. Antenna inserted between the anterior margin of the eyes and the frontoclypeal suture, filiform, with 11 antennomeres each one with few short and thin setae at apex. Frontoclypeal suture concave. Clypeus 3x as wide as long; anterior margin straight and posterior margin sinuous; surface similar to that of head. Labrum twice as wide as long; antero-lateral angles rounded and surface with long and thin setae. Maxillary palpus 4-segmented; terminal palpomere truncated apically. Labial palpus 3-segmented. Mentum and submentum squared. Gula rectangular. Genae covered with tomentum.

Thorax: Pronotum moderately as wide as long, arcuate anteriorly; sides sinuate and strongly serrate, posterior margin smooth with two prescutellar foveae ( Fig. 17A ). Surface with micropunctures and many short setae. Sublateral carinae complete and sinuous. Longitudinal impression long, wide and deep on disc, reaching the anterior and posterior margin, wider on middle portion ( Fig. 17A ).

Elytra twice as long as wide; anterior margin arcuate, lateral margin moderately arcuate and serrate; rounded apex ( Fig. 17A ). Humeri slightly elevated. Surface with puncture rows separated from each other by their diameter. Elytral suture moderately elevated. Carina short and elevated on interval IV, extending from base to 1/4 of the elytral length; sublateral carinae on intervals VI and VIII, extending from base to 3/4 of the elytral length. Epipleura without tomentum ( Fig. 17B ). Hind wings macropterous. Scutellum oval.

Prosternum narrow, surface with micropunctures, anterior margin straight, slightly raised and sides covered with tomentum. Prosternal process long and narrow, beyond the procoxae; lateral margin flat; rounded apex; disc flattened. Notosternal suture slightly sinuous. Hypomera wider posteriorly than anteriorly, lateral margin serrate surface with micropunctures and with a belt of tomentum reaching the anterior and lateral margins ( Fig. 17B ).

Mesoventrite with a groove to receive the prosternal process. Mesepimeron and mesepisternum covered with tomentum. Metaventrite broad and with longitudinal medial depression; surface with micropunctures and with sides covered with tomentum.

Legs (except tarsi) covered with punctures and tomentum ( Fig. 17B ). Coxae rounded; trochanter elongated; femora robust, 4x as long as wide and 1/4 of the elytra length; tibiae thin, 6x as long as wide and 1/3 of the length of the elytra. Protibiae each with a row of long golden setae and a row of spines in distal half. Tarsi elongate with setae; apical tarsomere the same length as the basal four combined. Claws long and thin.

Abdomen ( Fig. 17B ): five ventrites; as long as wide. Anterior and posterior margins straight on the first and second ventrites and arcuate on the subsequent ventrites, lateral margins rounded. Surface densely covered with tomentum (excepted for disc of first ventrite). Disc of the first ventrite with a deep depression, and with a pair of carinae extending towards and reaching the metaventrite. Fifth ventrite with lateral margins slightly produced posterolaterad, apex tapered and with short setae.

Male genitalia ( Fig. 17C ): (Total length: 0.59 mm. Greatest width: 0.20 mm), symmetrical. Phallobase moderately longer than wide, of similar length to the penis. Parameres articulated with the phallobase, reaching 3/4 of the penis length; 3x wider at base than at apex; apex sharp. Penis wide with the lateral margin sinuous, and apex moderately sinuous, nearly irregular semicircular at apical 1/3; fibula thin, elongated, with lateral margin sinuous and approximately the same length as the penis.

Female: External morphology similar to male, except for the absence of the row of spines on each tibia.

Material examined: 53 specimens.

Distribution: Brazil: Minas Gerais State.

Male holotype: ♂ | Holo- / type | Sete Lagoas / Minas Gerais Brazil / III.1963 F.Werner / U. Martins. L, Silva | MZSP 36015 (MZSP) .

Paratypes: 52 specimens: Para- / type | Sete Lagoas / Minas Gerais Brazil / III.1963 F.Werner / U. Martins. L, Silva (13 MZSP; 7 NHMUK; 5 USNM). Para- / type | BRASIL, MG, Sete Lagoas / IPEACO / 2-5.iii.1963 / A. Zunti leg. (27 MZSP) (MZSP 36006-36014, 36015-36046) .

Etymology: ubirajarai is a tribute to Professor Dr. Ubirajara Martins, the collector of type of this species, in recognition of his work on the longhorn beetles ( Cerambycidae ) of the world.

Comparative notes: Hexacylloepus ubirajarai sp. nov. resembles H. frater Hinton, 1939 and H. nirgua Hinton, 1972 . The new species resembles H. frater due to the long, wide and deep longitudinal impression on the pronotum, short legs and complete belt of tomentum on hypomera, but H. frater can be differentiated by the sinuous frontoclypeal suture, epipleura covered with tomentum, and all abdominal ventrites covered with tomentum. Hexacylloepus ubirajarai sp. nov. and H. nirgua have the male genitalia similar, but in H. nirgua the apices of the parameres are very thin, and, in addition, the frontoclypeal suture is conspicuous and all abdominal ventrites are covered with tomentum.

Figures

FIGURE 17. Hexacylloepus ubirajarai sp. nov.. Male. Holotype. (A–B) Habitus. (A) Dorsal view. (B) Ventral view. (C) Ventral view of male genitalia. Scale bars: (A–B) = 0.5mm. (C) = 0.1mm.