Helobata amazonensis Clarkson

Clarkson, Bruno & Almeida, Lúcia M., 2018, On Brazilian Helobata Bergroth, 1888 (Coleoptera: Hydrophilidae) II: new distribution data, Papéis Avulsos de Zoologia 58, pp. 1-6 : 2-5

publication ID

https://doi.org/ 10.11606/1807-0205/2018.58.35

persistent identifier

https://treatment.plazi.org/id/03DE075D-B43D-4337-85E4-FBAA5364FD88

treatment provided by

Felipe

scientific name

Helobata amazonensis Clarkson
status

 

Helobata amazonensis Clarkson View in CoL ,

Santos & Ferreira-Jr., 2016 ( Figs. 7-8 View Figures 7-11 )

Material examined: BRAZIL: Roraima State: Pacaraima Municipality: “Surumu, Roraima / IX.1966 / M. Alvarenga &/ F.M. Oliveira col.// Helobata amazonensis / Clarkson et al., 2016/ Clarkson det. 2018” (1 female: MZSP).

Distribution: Brazil ( Fig. 12 View Figure 12 ): Amazonas and Roraima (new record) States.

Discussion: This species was described based on a single male specimen from Central Amazon. This is the first mention of a female specimen. The examined specimen corresponds to H. amazonensis by the moderate-size – 5.00 mm in length compared to 5.70 mm in the holotype; the coloration – dorsum yellow with conspicuous brown areas,pronotum with well-defined central brown area,elytra with faint light brown spots close to humeral humps and diffusely spread throughout elytral disc ( Fig. 7 View Figures 7-11 ), and abdominal ventrites yellow ( Fig. 8 View Figures 7-11 ); the general morphology of head and mouth parts – anterior clypeal margin convex, slightly truncate medially ( Figs. 7-8 View Figures 7-11 ); frontoclypeal suture distinct ( Fig. 7 View Figures 7-11 ); maxillary palpomere 3 and 4 subequal in length ( Fig. 8 View Figures 7-11 ); mentum without conspicuous microsculpture; the general dorsal sculpture – punctures on elytral rows fine, regularly spaced ( Fig. 7 View Figures 7-11 ); the presence of fine and very short decumbent setae distributed on anterior half of the clypeus; the general morphology of the ventral projections – posteromedial elevation on mesoventrite semi-trapezoidal, very wide, with strongly raised lateral carinae, oblique, widely distant each other, converging anteriorly; widely connected with the metaventral projection ( Fig. 8 View Figures 7-11 ); metaventral projection (between mesocoxae) forming an elevated longitudinal carina, strongly and widely connected posteriorly with metaventral medial carina; metaventral medial carina rising gradually until connecting to metaventral projection ( Fig. 8 View Figures 7-11 ).

In comparison with the holotype the examined specimen ( Fig. 7-8 View Figures 7-11 ) shows variations in dorsal coloration as brown area on elytra expanded and elytral disc, head and pronotum without metallic sheen (with weak metallic sheen in the holotype); in the dorsal microsculpture as clypeal disc and frons with shagreened microsculpture on interstices of ground punctuation (without conspicuous microsculpture in the holotype); and in the presence of fine and very short decumbent setae on frons (absent in the holotype).

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydrophilidae

Genus

Helobata

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