Hexacylloepus Hinton, 1940 rises again; 18 new species of a neglected genus (Coleoptera: Byrrhoidea: Elmidae) Author Polizei, Thiago T. S. 0000-0003-3746-8865 Laboratório de Coleoptera (LaC) - Museu de Zoologia da Universidade de São Paulo (MZSP). São Paulo, São Paulo State, Brazil. thiagopolizei @ hotmail. com; https: // orcid. org / 0000 - 0003 - 3746 - 8865 & Programa de Pós-Graduação em Entomologia-Departamento de Biologia - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCL-RP) - Universidade de São Paulo (USP). Ribeirão Preto, São Paulo State, Brazil. thiagopolizei@hotmail.com Author Barclay, Maxwell V. L. Department of Life Sciences, Natural History Museum. London SW 7 5 BD, United Kingdom. Author Bispo, Pitágoras C. Programa de Pós-Graduação em Entomologia-Departamento de Biologia - Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCL-RP) - Universidade de São Paulo (USP). Ribeirão Preto, São Paulo State, Brazil. & Laboratório de Biologia Aquática (LABIA). Departamento de Ciências Biológicas - Faculdade de Ciências e Letras de Assis (FCL) - Universidade Estadual Paulista “ Júlio de Mesquita Filho ” (Unesp). Assis, São Paulo State, Brazil. text Zootaxa 2020 2020-07-22 4819 1 6 48 journal article 10.11646/zootaxa.4819.1.2 1175-5326 4396744 80258C53-F94D-46CB-9E86-AF0C3226DF9E Hexacylloepus manauara sp. nov. ( Fig. 10 A–C) Type locality: Brazil , Amazonas State , Manaus . Diagnosis : Antennae with thin and short setae at apex of each antennomeres. Frontoclypeal suture inconspicuous. Pronotum with a short, wide and deep longitudinal impression on disc, not reaching the anterior and posterior margins. Hypomera with a transverse belt of tomentum reaching only the lateral margin. Epipleura without tomentum. Tibiae each with two rows of setae in distal half. Abdomen with the disc of the first ventrite without tomentum, and a deep depression with a pair of carinae extending towards and reaching the metaventrite. Male genitalia apically acute; phallobase twice as long as wide, half of the penis length; parameres reaching 1/4 of the penis length; penis very elongated, constricted at base, with the lateral margin straight, apex slightly acute. Description: Male. Body suboval. Reddish-brown colour. Total length: 2.15 mm . Greatest width: 1.04 mm . Head: surface with micropunctures separated from each other by their diameter and with short setae. Antenna inserted at the anterior margin of the eyes, filiform, with 11 antennomeres each one with long thin setae at apex. Frontoclypeal suture inconspicuous. Clypeus 3x as wide as long; anterior margin moderately convex and posterior sinuous; surface similar to that of head. Labrum twice as wide as long; antero-lateral angles rounded and surface with short and thin setae. Maxillary palpus 4-segmented; terminal palpomere truncated apically. Labial palpus 3- segmented. Mentum and submentum rectangular. Gula rectangular. Genae covered with tomentum. Thorax: Pronotum longer than wide, arcuate anteriorly; sides sinuate, posterior margin smooth with two prescutellar foveae ( Fig. 10A ). Surface with micropunctures and with many dense, sparse, golden setae. Sublateral carinae complete and sinuous. Longitudinal impression short, wide and deep on disc, not reaching the anterior and posterior margins ( Fig. 10A ). Elytra slightly longer than wide; anterior margin arcuate, lateral margin moderately arcuate; rounded apex ( Fig. 10A ). Posterior half of elytral wider than anterior half. Humeri prominent. Surface with puncture rows separated from each other by their diameter and with rows of setae on intervals. Elytral suture moderately elevated. Carina short on interval IV, extending from base to 1/4 of the elytral length; sublateral carinae on intervals VI and VIII, extending from base to half of the elytral length. Epipleura without tomentum ( Fig. 10B ). Hind wings macropterous. Scutellum oval. Prosternum broad, strongly elevated and with a pair of carina reaching the anterior margin; surface with micropunctures, anterior margin straight with many setae and lateral margin covered with tomentum. Disc with a transverse depression. Prosternal process long, and beyond the procoxae; lateral margin elevated; straight apex; disc deep. 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. 10B ). Mesoventrite with a 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. 10B ). Coxae rounded; trochanter elongated; femora robust, 4x as long as wide, 1/3 of the length of the elytra; tibiae thin, 6x as long as wide, 1/3 of the length of the elytra. Tibiae each with two rows of setae in distal half. Tarsi elongate, with setae. Apical tarsomere with the length of the basal four combined. Claws long and thin. Abdomen ( Fig. 10B ): 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 a pair of carinae extending towards and reaching the metaventrite. Fifth ventrite with lateral margins slightly produced posterolaterad; apex tapered and with long setae. Male genitalia ( Fig. 10C ): (Total length: 0.90 mm . Greatest width: 0.16 mm ), symmetrical and very elongated. Phallobase twice as long as wide, with half of the penis length. Parameres articulated with the phallobase, reaching 1/4 of the penis length; twice as wide at base as at apex; apex moderately sharp. Penis very elongated, constricted at base, with the lateral margin straight; apex slightly sharp; 6x as long as wide; fibula elongate, as wide as penis, and of approximately the same length. Female: External morphology similar to male. Material examined: 62 specimens . FIGURE 10. Hexacylloepus manauara 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. Distribution: Brazil : Amazonas State. Male holotype : ♂ | BRAZIL / Manaos / ix-1937 / H.E.Hinton | H.E.Hinton / collection. / B.M.1977-566. | Holo- / type (NHMUK) Paratypes : 61 specimens : Manaos / ix-11-37 Braz | H.E.Hinton / collection. / B.M.1977-566. | Para- / type ( 2 ♂ 1 ♀ 7? NHMUK; 2 ♂ 5? MZSP) (MZSP 35745-35751). BRASIL . Amazonas. Manaus. / BR 174— Km 25. Quinta da Boa / Esperança. Igarapé atrás do Sítio. / 27.V. 2008 . 72m . C. Azevêdo leg. / 02°44’42,7”S 60º00’00,6”W (4 INPA). BRASIL . Amazonas. Manaus. / BR 174— Km 56. Trilha da Torre. / Igarapé menor. 22.V. 2008 . 44m . / C. Azevêdo et al. leg. / 02°35’50,9”S 60º12’54,9”W (5 INPA). BRASIL. Amazonas. Manaus. / AM 010— Km 26. Reserva Ducke. / Igarapé Bolívia . 26.V.2008 . / C. A. Azevêdo et al. leg. / 02°59’14,5”S 59º56’30,5”W (10 INPA; 21 MZSP) (MZSP 31521-31541). BRASIL. Amazonas. Presidente / Figueiredo. AM 240— Km 13. / Sítio do Maroca. 23.IV.2008 . / 02°00’54,4”S 59º51’34,4”W 106m / Neusa Hamada et al. leg (2 INPA). BRASIL . Amazonas. Presidente / Figueiredo. AM 240— Km 24. / Sítio Seu José. 20.IV.2008 . / 02°01’13,2”S 59º49’29,1”W / Neusa Hamada et al. leg (INPA). BRASIL . Amazonas. Presidente / Figueiredo. AM 240 Sítio dos / Pioneiros. 19.IV. 2008 . 94m . / 02°04’05,0”S 59º54’28,8”W / Neusa Hamada et al. leg (INPA). Etymology: manauara is a tribute to Manaus city ( Amazonas State ), the type locality. Comparative notes: Hexacylloepus manauara sp. nov. resembles Hexacylloepus heterelmoides Hinton, 1939 with a suboval body and the disc of the first abdominal ventrite without tomentum. However, H. manauara sp. nov. has setae on the surface of the pronotum and head, epipleura without tomentum, longitudinal impression on pronotal disc that is short, wide and deep. Hexacylloepus heterelmoides differs by having tomentum on epipleura, longitudinal impression on pronotum reaching the anterior and posterior margins, and absence of setae on pronotum and head. The male genitalia are also different: in H. manauara sp. nov. they are elongated, with the phallobase half the length of the penis, parameres reaching 1/4 of the penis length, apex moderately sharp; in H. heterelmoides , the genitalia are oval, with the phallobase with the same length of the penis, parameres reaching half of the penis length, apex rounded.