Guadalupe Del Río M, Lanteri Analía A
División Entomología, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina.
Zookeys. 2013 Dec 2(357):29-43. doi: 10.3897/zookeys.357.5854. eCollection 2013.
Stenocyphus Marshall, 1922 (Entiminae, Naupactini) includes three species: the type species S. bituberosus (Gyllenhal, 1833), S. tuberculatus (Hustache, 1938), comb. n. herein transferred from Neoericydeus Hustache, 1938, and S. sextuberosus sp. n. The genus is endemic to the Atlantic forests of the states of Espirito Santo, Rio de Janeiro and São Paulo, Brazil andis mainly characterized by the presence of humped elytra bearing large conical tubercles on the intervals 5, or 3 and 5, or 3, 5 and 7. It shares some external morphological characters with Hadropus Schoenherr, 1826 and the Brazilian species of Cyrtomon Schoenherr 1823, but its phylogenetic position is uncertain. Herein we provide a diagnostic key to separate Stenocyphus from those genera, generic and species redescriptions or descriptions, a key to species, habitus photographs, line drawings of genitalia, and a discussion of the patterns of elytral tubercles in unrelated genera of Neotropical broad-nosed weevils.
窄胸象属（Stenocyphus）由马歇尔于1922年建立（隐颚象亚科，纳帕克象族），包含三个物种：模式种双瘤窄胸象（Stenocyphus bituberosus）（吉伦哈尔，1833年）、瘤突窄胸象（Stenocyphus tuberculatus）（于斯塔什，1938年）（新组合，本文从于斯塔什1938年建立的新埃里西象属（Neoericydeus）移入）以及六瘤窄胸象（Stenocyphus sextuberosus）新种。该属为巴西圣埃斯皮里图州、里约热内卢州和圣保罗州大西洋森林所特有，主要特征是鞘翅隆起，在第5条、或第3和第5条、或第3、第5和第7条行距上有大型圆锥形瘤突。它与1826年的哈德罗普象属（Hadropus）舍恩赫尔以及1823年的巴西 Cyrtomon象属舍恩赫尔的一些巴西物种共有一些外部形态特征，但其系统发育位置尚不确定。本文提供了将窄胸象属与这些属区分开来的检索表、属和种的重新描述或描述、种检索表、成虫照片、生殖器线条图，以及对新热带区阔鼻象甲科不相关属鞘翅瘤突模式的讨论。
