Heterelmis debilis, Polizei, 2018

Polizei, Thiago Tadeu Silva, 2018, A new species and a key for the Brazilian species of the genus Heterelmis Sharp, 1882 (Coleoptera: Elmidae, Elminae), Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 58, pp. 4-4 : 2-4

publication ID	https://doi.org/ 10.11606/1807-0205/2018.58.20
publication LSID	lsid:zoobank.org:pub:34EEE39E-147D-4ADB-B600-53DA213CE83E
persistent identifier	https://treatment.plazi.org/id/14BAEF0C-3D5C-4FAF-94CF-8BD4CC4CD16F
taxon LSID	lsid:zoobank.org:act:14BAEF0C-3D5C-4FAF-94CF-8BD4CC4CD16F
treatment provided by	Carolina
scientific name	Heterelmis debilis
status	sp. nov.

Treatment

Heterelmis debilis sp. nov.

( Fig. 1 View Figure 1 A‑G)

Diagnosis: Body suboval, moderately convex. Head surface covered with micropunctures; antennomeres 3‑6 each one with half of length of apical antennomere. Pronotum with a feeble transversal and an oblique impressions on an‑

terior ⅖. Disc of all the five abdominal ventrites without tomentum. Aedeagus with parameres strongly acuminate on apex and with a row of setae on internal margin (in ventral view).

Description: General coloration: black with appendages brown. Size range (n = 10) Total length 2.1‑2.2 mm, greatest width 0.95‑1.05 mm.

Head: Partially retractable, without impressions, surface with micropunctures separated from each other by their diameter, each with one seta. Eyes protruding laterally. Antennae almost reaching hind angles of pronotum, filiform with 11 antennomeres, antennomeres 3‑6 with half of length of apical ones. Clypeus elongate and concave, with surface covered with punctures and golden long setae. Frontoclypeal suture straight. Labrum reddish‑brown, with anterior and lateral margins rounded, surface similar to the clypeus. Mandible ( Fig. 1A View Figure 1 ) with lateral lobe pronounced;apical tooth moderately sharp and prostheca feebly sclerotized with three lobes, apical lobe bilobed. Maxilla ( Fig. 1B View Figure 1 ): cardo wider than long; stipes large, undivided; palpifer present and large; palpi three articulated, galea palpiform and 2‑articulated, with long and few setae on apex and sensorial pores laterointernally; lacinia subrectangular with long setae of different sizes anteriorly and externally. Labium ( Fig. 1C View Figure 1 ): gula subrectangular with lateral margins arcuate and with a few setae; mentum with lateral margins concave,anterior angles broadly rounded, anterior margin gradually tapered towards apex; prementum narrow, with apex sinuous; palpi three articulated, palpomeres 1‑2 transverse, apical palpomere longer than the basal two combined; ligula wider than long, anterior angles rounded and produced laterally with long setae, ventral surface with rows of hair and circle‑like sensilla, ( Fig. 1C View Figure 1 ). Gena with tomentum.

Thorax: Pronotum as long as wide (length 0.7 mm, width 0.8 mm), ( Fig. 1D View Figure 1 ). Anterior margin moderately acute, anterior angles acute and protruding, lateral margins sinuous with granules, posterior angles acute, and posterior margin smooth with two prescutellar fovea. Pronotum surface covered with golden setae, with micropunctures separated their own diameter. Sublateral carinae complete, reaching the anterior and posterior margin. Feebly transversal impression in ⅖ of disc, with the posterior portion with a feebly oblique impression towards the scutellum ( Fig. 1D View Figure 1 ). Elytra ( Fig. 1E View Figure 1 ) longer than wide (length 1.35 mm, width 1.0 mm), anterior margin arcuate, lateral margin sinuous and apex margin smooth arcuate. Median suture elevated. Sublateral carinae on intervals VI and VIII, extending ¾ of elytral length on sixth interval, and ⅘ of elytra length on eighth interval; surface with puncture rows separated by double rows of setae and carinae in each intervals. Scutellum rounded, covered by two rows of golden short setae. Epipleura covered by tomentum ( Fig. 1F View Figure 1 ). Hind wings macropterous. Prosternum broad,as long as wide,with lateral portion covered by tomentum, forming a belt with notosternal suture, reaching the internal ⅖ of hypomera ( Fig. 1F View Figure 1 ). Hypomerum 4x longer than wide, with a deep transversal depression on anterior ⅖. Prosternal process as long as wide, reaching coxae, with posterior margin moderately rounded, surface with micropunctures. Mesoventrite twice as long as wide, with a shallow depression to receive prosternal process, surface similar to prosternum. Metaventrite very broad, 3x wider than long, lateral part covered by tomentum, disc alutaceous with a longitudinal line, with punctures separated from each other by their own diameter. Legs covered by tomentum. Coxae rounded. Trochanter as long as wide. Femora narrowed at the distal margin, only the half‑proximal portion covered by tomentum. Tibiae with a row of long fringes of tomentum on half‑distal; two rows of short spines on distal third. Elongated tarsus, with setae, apical tarsomere smaller than the basal four combined. Claws large and stout.

Abdomen: Five ventrites ( Fig. 1F View Figure 1 ). Margins moderately arcuate. Surface covered by micropuctures and short setae, separated from each other by their own diameter, tomentum absent only in median portion. First ventrite with a pair of carinae medially, extending from anterior to posterior margin. Fifth ventrite with apex rounded,lateral margin with a shallow depression.

Genitalia: ( Fig. 1G View Figure 1 ). Phallobase twice as long as wide. Parameres reaching the posterior ¾ of penis length, twice wider at base than at apex, feebly sharp on apex, inner margin with a row of long setae. Penis as long as phallobase, 3x as long as wide, strongly constricted at apex; basolateral apophyses 4x longer than wide; fibula restricted to the anterior half part.

Female: External morphology similar to male except by the absence of long setae on tibiae.

Etymology: The specific epithet debilis refers to the feeble transversal and oblique impressions on pronotum.

Type locality: Nova Teutônia (municipality of Seara), Santa Catarina State, Brazil.

Male holotype: Labels : ♂ | Holotype | Nova Teutônia S.C. / Brasil / V.1966 / Fritz Plaumann leg. | MZSP 35546 View Materials . ( MZSP).

Paratypes: 92 specimens: Brazil, Minas Gerais: Itacarambi / (Caverna Olhos d’Água) / 10.VII.1993 / E. Trajano leg. (2 specimens, MZSP). Brazil, Minas Gerais: Cambui / (Sitio Cachoeirinha, Córrego) / 01.V.2017 / S. Vanin leg. (1 specimen, MZSP). Brazil, São Paulo / Campos do Jordão / (Pq. Estadual), 26.III.1987 / L.G.Oliveira & C.G. Froehlich leg. (4 specimens, MZSP). Brazil, São Paulo / Salesópolis ( Estação Biológica / de Boracéia, Rib. Venerando) / 27‑28, Maio, 1965 / C.G. Froehlich leg. (1 specimen, MZSP). Brazil, São Paulo / Ribeirão Grande (Faz. Intervales) / 09.XI.1983, Froehlich & Paprocki leg. (10 specimens, MZSP). Brazil, Santa Catarina / Anita Garibaldi I.1940 / Col. Dirings (3 specimens, MZSP). Brazil, Santa Catarina / Nova Teutônia, V.1966 / Fritz Plaumann leg. (60 specimens in MZSP; 11 specimens in NHMUK) .

Additional material: 10 specimens: Brazil, Rio de Janeiro / Nova Friburgo, Lumiar / 15.XI.2008 / B.H.L. Sampaio leg. (Entomological Collection Professor José Alfredo Pinheiro Dutra, Department of Zoology, Federal University of Rio de Janeiro (DZRJ)).

Comments: Heterelmis debilis sp. nov. can be easily differentiated from any other species of the genus by a feeble transversal and an oblique impressions on pronotum. The new species resembles H.obscura by the body shape and the presence of a transversal and an oblique impressions on pronotum but the latter has stronger impressions on pronotum, the body is more elongated, besides the differences in the male genitalia. It is also similar to H. apicata (Grouvelle, 1896) by the pattern of the male genitalia, however the aedeagus of the latter is thiner, without row of setae on parameres and its pronotum does not present any kind of impression.

Heterelmis obscura was described by Sharp (1882) to Guatemala and Grouvelle (1889) recorded it from Brazil (Santa Catarina State). According to Grouvelle, these specimens are less elongated than the Central American specimens. The type lectotype of H. obscura and the Grouvelle’s collection, both housed at MNHN (Paris), were studied.The Brazilian specimens of “H. obscura” det. by Grouvelle (1889) are actually a new species, here described and named Heterelmis debilis sp. nov. For this reason, H. obscura has its geographic distribution restricted to Costa Rica, Guatemala, Mexico and Peru (Jäch et al., 2016).