Hexacylloepus calori, 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 : 9-11

Hexacylloepus calori sp. nov.

( Fig. 2 A–C)

Type locality: Brazil, Bahia State, Igrapiuna .

Diagnosis: Antennae with thin setae at apex of each antennomere. Frontoclypeal suture straight. Pronotum with a long, narrow and deep impression on disc, reaching the anterior and posterior margins. Hypomera with a transverse belt of tomentum reaching only the lateral margin. Epipleura without tomentum. Protibiae each with a row of spines and setae; meso- and metatibiae each with two rows of striking setae; metacoxae with a spur. Abdomen with the disc of the first ventrite without tomentum, and a deep depression with a pair of carinae directed towards and reaching the metaventrite. Male genitalia; phallobase twice as long as wide; parameres extending 2/3 of the penis length; penis with the lateral margin sinuous; anterior half narrow and posterior half wide.

Description: Male. Body elongated, subparallel. Colour light yellow. Total length: 1.81 mm. Greatest width: 0.81 mm.

Head: surface with micropunctures separated from each other by their diameter. Antenna inserted on the anterior margin of the eye, filiform, with 11 antennomeres each with long thin setae at the apex. Frontoclypeal suture straight. Clypeus 3x as wide as long; anterior margin straight, posterior margin sinuous; surface similar to that of head. Labrum twice as wide as long; antero-lateral angles rounded; surface alutaceous with short, thin setae. Maxillary palpus 4-segmented; terminal palpomere truncate apically. Labial palpus 3-segmented. Mentum wide and flat, submentum rectangular. Gula rectangular. Genae covered with tomentum.

Thorax: Pronotum longer than wide, arcuate anteriorly; sides sinuate and serrate; posterior margin smooth with two prescutellar foveae ( Fig. 2A ). Surface with setae originating from the punctures, micropunctures separated from each other by their diameter. Sublateral carinae complete, sinuous and raised. A pair of depressions on the middle of pronotum, between the sublateral carinae and the longitudinal impression ( Fig. 2A ). Longitudinal impression long and deep on disc, wider on middle portion and reaching the anterior and posterior margins.

Elytra 2.5x longer than wide; anterior margin arcuate; lateral margin moderately arcuate and serrate; apex rounded ( Fig. 2A ). Humeri rounded and prominent. Surface with puncture rows separated from each other by their diameter. Elytral suture moderately prominent. 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 4/5 of the elytral length. Epipleura without tomentum ( Fig. 2B ). Hind wings macropterous. Scutellum oval.

Prosternum narrow, strongly elevated and with a pair of carina reaching the anterior margin; surface with micropunctures; anterior margin straight, and lateral margin with tomentum; disc depressed. Prosternal process long and extending beyond procoxae; strongly excavated at disc; lateral margin prominent; rounded apex. Notosternal suture sinuous. Hypomera wider posteriorly than anteriorly, lateral margin serrate, surface with micropunctures and with a transverse belt of tomentum reaching only to the lateral margin ( Fig. 2B ).

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

Legs (except tarsi) covered with punctures and tomentum ( Fig. 2B ). Coxae rounded; trochanters elongate; femora 6x as long as wide, a third of the length of elytra; tibiae long and thin, 10x as long as wide, a third of the length of elytra. Metacoxae each with a long spur curved, towards the metaventrite. Protibiae each with a complete dense row of long setae and a row of spines in the distal half. Meso- and metatibiae each with two complete dense rows of spines. Tarsi elongate, with setae; apical tarsomere longer than the basal four combined. Claws long and thin.

Abdomen ( Fig. 2B ): 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), micropunctures and short setae. Disc of the first ventrite with a deep depression and with a pair of carinae reaching the metaventrite. Fifth ventrite with tapered apex and with long setae.

Male genitalia ( Fig. 2C ): (Total length: 0.70 mm. Greatest width: 0.16 mm), symmetrical and acute. Phallobase twice as long as wide, moderately longer than the penis length. Parameres articulated with the phallobase, reaching 2/3 of the penis length; apex sharp, with a tuft of long thin setae. Penis with the lateral margin sinuous; anterior half constricted, half of the width of the posterior half; apex acute; fibula elongated, approximately 2/3 of the length of the penis.

Female: External morphology similar to that of male, except for the shorter metacoxal spur.

Material examined: 102 specimens.

Male holotype: ♂ | Holo- / type | BR-BA-Igrapiuna / Reserva Michelin / 19.IX.2012 / Adolfo Calor leg. | Córrego do Alojamento / 13º 44’ 23.5” S / 39º 10’ 21.0” W / Light trap. | MZSP 35776 (MZSP)

Paratypes: 101 specimens (36 ♂ 65 ♀): BR-BA-Igrapiuna / Reserva Michelin / 19.IX.2012 / Adolfo Calor leg. | Córrego do Alojamento / 13º 44’ 23.5” S / 39º 10’ 21.0” W / Light trap. (12 ♂ 25 ♀ MZSP; 12 ♂ 20 ♀ NHMUK; 6 ♂ 10 ♀ USN; 6 ♂ 10 ♀ SEMK) (MZSP 35768-35775; 35777-35805) .

Distribuition: Brazil: Bahia State.

Etymology: calori is a tribute to Dr. Adolfo Calor, the collector of the specimens and one of the foremost specialists on Neotropical caddisflies.

Comparative notes: Hexacylloepus calori sp. nov. resembles Hexacylloepus bassindalei Hinton, 1969 with the body elongated and subparallel, the general colour similar and the metacoxae with a spur. However, H. calori sp. nov. has a complete longitudinal impression on the disc of the pronotum, antennae with setae on all antennomeres, and the disc of the first abdominal ventrite without tomentum, while H. bassindalei has a short longitudinal impression on the disc of the pronotum, antennae each with only the six apical antennomeres with setae, and the disc of the first and second abdominal ventrite without tomentum. The male genitalia also differ, in H. calori sp. nov. the parameres have a tuft of setae on their apices and the penis is constricted in anterior half; in H. bassindalei there is no tuft of setae on the parameres and the penis is narrowed towards the apex.

Figures

FIGURE 2. Hexacylloepus calori 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.