Eurystethus Mayr 1864
Creators: name: Correia, André Oliveira
name: Fernandes, José Antônio Marin
name: Campos, Luiz Alexandre
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Eurystethus

description: Eurystethus jo sp. nov.
(Figs. 1A, B; 2A, B; 3A–D; 4)
Etymology. The name honors the prominent taxonomist Jocélia Grazia, the way her friends affectionately call her; noun in apposition.
Holotype male. BRAZIL. Amazonas. ♂, Barcelos, rio Unini, Boca da Onça; 25–26/I/1990; P. Bürhnheim, H. Remold, N.O. Aguiar e J. da Silva col. [lat. -0.973987; long. -62.925583] (UFAM).
Differential diagnosis. This is one of the tiniest species in Eurystethus together with E. microlobatus Ruckes. Eurystethus jo sp. nov. shares with E. parvulus Ruckes the general morphology of the body and pygophore, such as laterally projected parameres whose apices curve ventrad and partially reach each other beneath the segment X. However, in E. jo the lateral projection of paramere is acuminate and almost touches the posterolateral angles, and the long thorn-like projections of the process of ventral rim are unique and long (Figs 3B, D, pvr); in E. parvulus the projection and processes are shorter. The area behind the eyes (Fig. 2B, abe) almost entirely black, a conspicuous macula at the end of the radial vein at corium, and the lateral areas of urosternites densely spotted differs E. jo from E. multipunctatus sp. nov. and E. rufodorsatus sp. nov., which have the area behind the eyes mostly yellow, macula almost inconspicuous and urosternites sparsely spotted. Also, E. jo has anteocular angles slightly developed (Fig. 2A, aoa), different from the undeveloped anteocular angles of E. multipunctatus, and the head longer than wide, different from the E. rufodorsatus with head as long as wide. The male parameres (Fig. 3A, pa) are bilobed and oblique to each other at apex (Fig. 3B), with both lobes about the same size and only the posterior lobes reaching each other beneath the segment X (Figs 3A, X, Figs 3B–D). The shape of parameres and the subrectangular and long posterolateral angles of pygophore (Fig. 3A, pla), differs E. jo from E. multipunctatus, with posterolateral angles wider.
Description. Head: Mandibular plates reflexed.Anteocular angles developed, rounded and shorter than half the width of the eyes. Interommatidial sensilla (Fig. 2A, ios) long. Area behind the eyes almost entirely black, yellow on middle and narrow close to the eyes. Ventral surface of head with punctures on base of buccula and near the posterior half of it. Margins of maxillary plates with tiny black spots. Antennomeres proportions: I<II>III<IV; V not observed. Antennomere I almost entirely black, except on dorsal side and smoky ventral area. Intercalary labial unit short, enlarged (sensu Ruckes 1966).
Thorax: Pronotum with punctured spots at posterior margin of pronotum. Anterolateral angles (Fig. 2A, ala) directed laterad.Anterolateral margins of pronotum slightly arcuate.Transhumeral tubercles (Figs 2A–B, tht) slightly developed and rounded. Scutellum with dense punctured spots on the lateral face of tubercles. Anterior tubercles of scutellum (Figs 2A–B, ats) developed, acuminate, surpassing the height of transhumeral tubercles in lateral view (Fig. 2B). Posterior tubercle (Fig. 2B, pts) slightly tumid. Apex of scutellum (Fig. 2B, aps) reflexed and high, about ⅓ the anterior tubercles height and surpassing the posterior tubercles height. Lateral portions of thoracic pleura with dense punctured spots. Femora with reddish marks, sparse black spots, and incomplete annulus near apices. Tibiae yellow on apices. Tarsi yellow with few reddish marks.
Abdomen: Connexival segments with few punctured spots and reddish mark on anterior and posterior margins of each segment. Urosternites heterogeneously and densely spotted on lateral thirds; urosternite VII with spots also on middle third. Intersegmental areas, pseudosuture and trichobothrial tubercles light brown to concolor with the abdomen. Spiracles black.
Male (Figs 3A–D): Pygophore campaniform. Basal portion of parameres flat, directed laterad over the posterolateral angles of pygophore; distal portions convergent to each other, abruptly curved ventrally and then mesially (Fig. 3C); apex truncate and bilobed, with rounded angles. Process of ventral rim shield-like, ventral portion developed into a pair of black thorns (Figs 3B, D, pvr). Posterolateral angles dorsoposteriorly projected, ventrally shallowly concave, apex subrectangular with rounded angles. Ventral margin of pygophore (Figs 3A–D, vm) medially concave, with dense and black punctured spots forming a broad transversal line.
Measurements. Total length: 7.4 mm; abdominal width: 4.8 mm; head length: 1.8 mm; head width: 0.8 mm; antennomeres length: I, 0.6; II, 0.7; III, 0.7; IV, 1 mm; pronotum length: 1.7 mm; pronotum width: 4.5 mm; scutellum length: 3.11 mm; scutellum basal width: 2.62 mm.
Distribution (Fig. 4). BRAZIL. Amazonas: Barcelos.
description: Published as part of Correia, André Oliveira, Fernandes, José Antônio Marin & Campos, Luiz Alexandre, 2021, Three new species of Eurystethus from Brazil (Hemiptera: Heteroptera: Pentatomidae), pp. 585-594 in Zootaxa 4958 (1) on pages 586-587, DOI: 10.11646/zootaxa.4958.1.34, http://zenodo.org/record/4692518