Haemulon steindachneri (Jordan and Gilbert) (Haemulidae), popularly known as "cocoroca-de-boca-larga", "latin-grunt" or "latin-burro", represents a species complex found on the Atlantic western coast and on the Pacific eastern coast, condition confirmed recently by molecular phylogenies. In the present study, DNA barcoding analysis recognizes two distinct clusters; the first includes Brazil and Caribbean, and the second is composed of Pacific specimens, with genetic distance of 7.4%, differentiated by 35 base pairs. In addition to the molecular evidence, our results show morphological differences that distinguish the Atlantic lineage from that of the Pacific: anal fin, usually, with eight rays (vs. generally nine rays in Pacific); 13-15 scales below the lateral line, rarely 12 (vs. 12 scales below the lateral line, rarely 13 in Pacific), posterior margin of the maxilla robust with a slightly angled end (vs. smaller maxilla with moderately convex extremity), and presence of a spot on the pre-operculum, broad and robust, with no definite shape (vs. narrow spot, with anterior extremity tuned and posterior straight, resembling a triangle in Pacific). Therefore, based on both molecular and morphological evidences, H. steindachneri is redescribed for the Pacific coast while a new species is described for the Atlantic coast.

中文翻译：

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物种复合体 Haemulon steindachneri ( ) (Eupercaria; Haemulidae) 的综合分类，描述了来自西大西洋的一个新物种

Haemulon steindachneri (Jordan and Gilbert) (Haemulidae)，俗称“cocoroca-de-boca-larga”、“latin-grunt”或“latin-burro”，代表在大西洋西海岸和太平洋发现的物种复合体东海岸，最近分子系统发育证实了这种情况。在本研究中，DNA 条形码分析识别出两个不同的簇；第一个包括巴西和加勒比海，第二个由太平洋标本组成，遗传距离为 7.4%，由 35 个碱基对区分。除了分子证据外，我们的结果还显示了大西洋谱系与太平洋谱系的形态差异：臀鳍通常有八条射线（而太平洋通常有九条射线）；侧线以下有 13-15 个鳞片，很少有 12 个（而侧线以下有 12 个鳞片，在太平洋地区很少 13），上颌骨的后缘结实，末端略微倾斜（相对于较小的上颌骨，末端适度凸出），在前鳃盖上有一个斑点，宽而结实，没有明确的形状（vs.窄点，前肢微调，后肢笔直，类似于太平洋中的三角形）。因此，基于分子和形态学证据，H. steindachneri 被重新描述为太平洋沿岸，而一个新物种被描述为大西洋沿岸。