Hydrocanthus zimmermanni, Guimarães & Ferreira-Jr & Miller, 2018

Guimarães, Bruno A. C., Ferreira-Jr, Nelson & Miller, Kelly B., 2018, On Hydrocanthus Say, 1823 (Coleoptera: Noteridae): description of a new species, two new synonyms and a key to Brazilian species, Zootaxa 4508 (2), pp. 288-300 : 289-296

publication ID

https://doi.org/ 10.11646/zootaxa.4508.2.10

publication LSID

lsid:zoobank.org:pub:ADB5471A-2473-441A-83EE-B09D479BC92B

DOI

https://doi.org/10.5281/zenodo.5955766

persistent identifier

https://treatment.plazi.org/id/C656320D-012B-1848-AEAB-0298A527FF19

treatment provided by

Plazi

scientific name

Hydrocanthus zimmermanni
status

sp. nov.

Hydrocanthus zimmermanni sp. nov.

( Figs 1 View FIGURE 1 j–k, 3k–l, 4y–aa, 5a, 6a)

Type locality. Peru, Madre de Dios Region, Tambopata River, Explorer’s Inn , 12°50’12.5”S 69°17’36.3”W GoogleMaps .

Type material. Holotype GoogleMaps ♂. “ PERU, MADRE DE DIOS REGION, Tambopata River, Explorer’s Inn   GoogleMaps , 12°50’12.5”S 69°17’36.3”W, 10.XII.2003, Miller K.B. leg.” (MSBA). Paratypes. Same data as Holotype (1 ♂ 1 ♀ / MSBA) .

Diagnosis. Hydrocanthus zimmermanni sp. nov. can be distinguished from other species in the genus by the following characteristics: male and female with prosternum laterally and medially setose and prosternal process entirely smooth ( Figs 3 View FIGURE 3 k–l); median lobe of aedeagus, in lateral aspect, with two ridges: one long dorsally on the left side, rising basally, entirely crossing the left surface and extending to the midlength of the ventral margin, and one short dorsal ridge on the right side, rising at distal ¾ of dorsal margin and ending abruptly subapically (Fig. 4z).

Description. Holotype. Body outline, in dorsal view ( Fig. 1j View FIGURE 1 ) oval, broader anteriorly and attenuated posteriorly (TL/MW = 1.95).

Measurements. TL = 4.20 mm; MW = 2.15 mm; AW = 0.55 mm; BW = 0.20 mm; TL/MW = 1.95; AW/BW = 2.75.

Color ( Fig. 1j View FIGURE 1 ). Head and pronotum light yellowish-brown. Elytra very dark reddish-brown from base to midlength, light to dark reddish-brown from after midlength to near apex and light yellowish-brown at apex; marmorations not visible. Ventral surface light yellowish-brown. Apical region of mesofemur and ventral region of metafemur darkened; mesotibia and metatibia entirely darkened.

FIGURE 4. Hydrocanthus species aedeagus. a, d, g, j, m, p, s, v, y) right lateral lobe; b, e, h, k, n, q, t, w, z) median lobe, left lateral aspect; c, f, i, l, o, r, u, x, aa) left lateral lobe. a–c) Hydrocanthus ancus , d–f) Hydrocanthus debilis , g–i) Hydrocanthus guignoti , j–l) Hydrocanthus levigatus , m–o) Hydrocanthus paraguayensis , p–r) Hydrocanthus sharpi , s–u) Hydrocanthus socius , v–x) Hydrocanthus marmoratus , y–aa) Hydrocanthus zimmermanni sp. nov. Scale bar = 0.2 mm.

Sculpture. Head microsculpture consisting of small, regular cells. Pronotum and elytra with shallow, reticulate microsculpture. Prosternum, metaventrite and noterid platform microsculpture consisting of small, regular cells, larger than those in the head. Ventral surface consisting of small, regular cells, as larger as those in prosternum, metaventrite and noterid platform.

Head. Antennae glabrous; antennomeres III–XI subserrate; VII–IX slightly expanded; antennomere XI distally attenuate. Maxillary palps glabrous; apical palpomere elongate, length almost greater than half of total length of palp, distally attenuate, apex truncate, emarginated with two small sensory fields. Labial palps glabrous; apical palpomere rectangular, expanded, length greater than twice the combined length of basal palpomeres, bifid, with sensory field on the medioventral margin, with a second sensory field smaller, round, produced on a small protuberance anteromedial to medial margin.

Thorax. Prosternal process wide (AW/BW = 2.75). Prosternum laterally and medially setose; prosternal process entirely smooth; metaventrite setose in posterior ¼, leaving a glabrous semicircular area anteriorly ( Fig. 3k View FIGURE 3 ). Metaventrite without tubercles. Mesofemur anteroventral margin with fine setose fringe, rising at base and extending to first ¼ of mesofemur as in Figs 5a View FIGURE 5 , 6a View FIGURE 6 (figured is H. levigatus , with similar characters of mesofemur). Mesotarsomere I with semicircular region excavated at base; general shape slightly sinuous near adhesive setae. Adhesive setae ringed by marginal setose corona.

Aedeagus. Median lobe, in lateral aspect, with ventral margin curved in basal half and straight in apical half and truncate apex; with one long dorsal ridge on left side, rising at base, entirely crossing left surface and ceasing at midlength of ventral margin, and one short dorsal ridges on right side, rising at distal ¾ of dorsal margin and abruptly ceasing subapically (Fig. 4z). Left lateral lobe, in lateral aspect, slender, elongated and considerably twisted apically with apex globose and setose along dorsal margin (Fig. 4aa). Right lateral lobe, in lateral aspect, broad and subrectangular (Fig. 4y).

Female. Head and pronotum reddish-brown; elytra entirely very dark reddish-brown ( Fig. 1k View FIGURE 1 ); ventral surface reddish-brown; mesofemur, mesotibia and metafemur without darkened parts.

Variation. Measurements. TL = 4.15–4.45 mm, ♂ = 4.15 mm, ♀ = 4.45 mm; MW = 2.10–2.35 mm; AW = 0.55–0.60 mm; BW = 0.20 mm; TL/MW = 1.75–2.10; AW/BW = 2.75–3.00.

Due to the lack of additional specimens available, it is not possible to assess intraspecific variation.

Taxonomic notes. The distinctive pattern of prosternum and prosternal process setation and aedeagal features of H. zimmermanni sp. nov. makes its identification a relatively simple task, especially if male specimens are available ( Figs 1j View FIGURE 1 , 3k View FIGURE 3 , 4z). However, when only female specimens are available there is a chance of them being mistaken for H. sharpi Zimmermann , 1 928. Females of the two species can be distinguished by their different patterns of metaventrite setation, where in females of H. zimmermanni sp. nov., the metaventrite is setose in the posterior ¼, leaving a glabrous semicircular area anteriorly ( Fig. 3l View FIGURE 3 ), and in females of H. sharpi , the metaventrite is distinctly setose on the sides, leaving a glabrous circular area near the posterior margin and a glabrous subtriangular area anteriorly ( Fig. 3b View FIGURE 3 ).

It is necessary to consider that whereas bicolored elytra are unique within the genus, due to the lack of available specimens, it is not possible to assess whether this characteristic is really a diagnostic feature of Hydrocanthus zimmermanni sp. nov. or it is only related to intraspecific variation.

Etymology. The specific name is an homage to Alois Zimmermann. It is a noun in the nominative singular standing in apposition.

Geographic distribution. So far Hydrocanthus zimmermanni sp. nov. is known only from the region of Madre de Dios, Peru.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Noteridae

Genus

Hydrocanthus

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