{"title":"硬鼻刺猫的分类鉴定(志形目:刺猫科:特征刺猫1925)及对gephartrachydoras, n.sp的描述。","authors":"M. Sabaj, Mariangeles Arce Hernández","doi":"10.1635/053.166.0102","DOIUrl":null,"url":null,"abstract":"ABSTRACT. Trachydoras is a genus of Doradidae (thorny catfishes) with five nominal valid species distributed in lowland areas of the Amazon, Orinoco, Paraná-Paraguay and Essequibo river basins of South America. A sixth species is described here as Trachydoras gepharti and diagnosed by five characteristics unique among congeners: mental barbels thick, tapered and profusely ornamented with many elongate fleshy papillae loosely arranged in 2–3 rows (vs. mental barbels thinner, papillae lacking or fewer, arranged in 1–2 rows); distinct columns of small, soft papillae along medial and lateral margins of gill filaments on all gill arches (vs. gill filaments lacking conspicuous papillae in congeners); gas bladder acorn-shaped (vs. cordiform) with smooth anterolateral shoulder (vs. shoulder with accessory diverticulum) and terminal diverticula medially united into singular, finger-like projection formed mostly by elongation of only one of the two posterior chambers (vs. both chambers elongated, contributing more or less equally to terminal diverticula in congeners or terminal diverticula absent or reduced in some specimens of T. nattereri and T. paraguayensis). Trachydoras gepharti is known from the Amazon and Orinoco basins where it often occurs syntopically with T. microstomus, T. nattereri and a separate undescribed species of Trachydoras. Like other species of Trachydoras, T. gepharti is specialized for vacuuming chironomid larvae from sandy substrates in medium to large river channels. Redescriptions and diagnoses are provided for the five nominal valid species of Trachydoras along with a key to identification and comments on characteristics used to diagnose the genus and delimit species. Designations include a lectotype (NMW 46375, 91.7 mm SL) for Trachydoras brevis (Kner 1853) and neotype (ANSP 178443, 100 mm SL) for T. nattereri (Steindachner 1881). The true holotype of T. microstomus (Eigenmann 1912) is identified as FMNH 118302 [ex. FMNH 53207, ex. CM 1650] and the specimen previously cataloged as the holotype (FMNH 53206) is identified as T. brevis.","PeriodicalId":54579,"journal":{"name":"Proceedings of the Academy of Natural Sciences of Philadelphia","volume":"166 1","pages":"1 - 53"},"PeriodicalIF":0.5000,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1635/053.166.0102","citationCount":"8","resultStr":"{\"title\":\"Taxonomic assessment of the Hard-Nosed Thornycats (Siluriformes: Doradidae: Trachydoras Eigenmann 1925) with description of Trachydoras gepharti, n. sp.\",\"authors\":\"M. Sabaj, Mariangeles Arce Hernández\",\"doi\":\"10.1635/053.166.0102\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"ABSTRACT. Trachydoras is a genus of Doradidae (thorny catfishes) with five nominal valid species distributed in lowland areas of the Amazon, Orinoco, Paraná-Paraguay and Essequibo river basins of South America. A sixth species is described here as Trachydoras gepharti and diagnosed by five characteristics unique among congeners: mental barbels thick, tapered and profusely ornamented with many elongate fleshy papillae loosely arranged in 2–3 rows (vs. mental barbels thinner, papillae lacking or fewer, arranged in 1–2 rows); distinct columns of small, soft papillae along medial and lateral margins of gill filaments on all gill arches (vs. gill filaments lacking conspicuous papillae in congeners); gas bladder acorn-shaped (vs. cordiform) with smooth anterolateral shoulder (vs. shoulder with accessory diverticulum) and terminal diverticula medially united into singular, finger-like projection formed mostly by elongation of only one of the two posterior chambers (vs. both chambers elongated, contributing more or less equally to terminal diverticula in congeners or terminal diverticula absent or reduced in some specimens of T. nattereri and T. paraguayensis). 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引用次数: 8
摘要
摘要。Trachydoras是多刺鲶鱼科的一个属,有五种名义有效物种,分布在南美洲亚马逊、奥里诺科、巴拉那-巴拉圭和埃塞奎博河流域的低地地区。第六个物种在这里被描述为Trachydoras gepharti,并通过同类中特有的五个特征进行诊断:精神杠铃厚、锥形,装饰丰富,有许多细长的肉质乳头,松散地排列在2-3排(而精神杠铃更薄,乳头缺失或更少,排列在1-2排);在所有鳃弓上,沿着鳃丝的内侧和外侧边缘有明显的小而软的乳头列(与同类中缺乏明显乳头的鳃丝相比);具有光滑的前外侧肩(相对于具有副憩室的肩)和末端憩室的气囊橡子形(相对于心形)向内合并为单一的,指状突起主要由两个后腔中的一个的伸长形成(与两个腔伸长相比,两个腔都伸长,对同类中的终末期憩室的贡献或多或少相等,或对纳特勒氏锥虫和巴拉圭锥虫的一些标本中缺失或减少的终末憩室的贡献)。在亚马逊和奥里诺科河流域,人们都知道gepharti Trachydoras,在那里它经常与微小T.tomus、纳特勒T.nattereri和一个单独的未描述的Trachydora物种同生。与其他Trachydoras物种一样,T.gepharti专门用于从中大型河道的沙质基质中抽真空处理摇蚊幼虫。对Trachydoras的五个名义有效物种进行了重新描述和诊断,并提供了识别关键和对用于诊断属和界定物种的特征的评论。名称包括Trachydoras brevis(Kner 1853)的选择型(NMW 46375,91.7 mm SL)和T.nattereri(Steindachner 1881)的新型(ANSP 178443,100 mm SL)。微小T.microtomus的真正正模标本(Eigenmann 1912)被鉴定为FMNH 118302[例如,FMNH 53207,例如,CM 1650],并且之前被编目为正模标本的标本(FMNH 53/206)被鉴定为由短T.brevis。
Taxonomic assessment of the Hard-Nosed Thornycats (Siluriformes: Doradidae: Trachydoras Eigenmann 1925) with description of Trachydoras gepharti, n. sp.
ABSTRACT. Trachydoras is a genus of Doradidae (thorny catfishes) with five nominal valid species distributed in lowland areas of the Amazon, Orinoco, Paraná-Paraguay and Essequibo river basins of South America. A sixth species is described here as Trachydoras gepharti and diagnosed by five characteristics unique among congeners: mental barbels thick, tapered and profusely ornamented with many elongate fleshy papillae loosely arranged in 2–3 rows (vs. mental barbels thinner, papillae lacking or fewer, arranged in 1–2 rows); distinct columns of small, soft papillae along medial and lateral margins of gill filaments on all gill arches (vs. gill filaments lacking conspicuous papillae in congeners); gas bladder acorn-shaped (vs. cordiform) with smooth anterolateral shoulder (vs. shoulder with accessory diverticulum) and terminal diverticula medially united into singular, finger-like projection formed mostly by elongation of only one of the two posterior chambers (vs. both chambers elongated, contributing more or less equally to terminal diverticula in congeners or terminal diverticula absent or reduced in some specimens of T. nattereri and T. paraguayensis). Trachydoras gepharti is known from the Amazon and Orinoco basins where it often occurs syntopically with T. microstomus, T. nattereri and a separate undescribed species of Trachydoras. Like other species of Trachydoras, T. gepharti is specialized for vacuuming chironomid larvae from sandy substrates in medium to large river channels. Redescriptions and diagnoses are provided for the five nominal valid species of Trachydoras along with a key to identification and comments on characteristics used to diagnose the genus and delimit species. Designations include a lectotype (NMW 46375, 91.7 mm SL) for Trachydoras brevis (Kner 1853) and neotype (ANSP 178443, 100 mm SL) for T. nattereri (Steindachner 1881). The true holotype of T. microstomus (Eigenmann 1912) is identified as FMNH 118302 [ex. FMNH 53207, ex. CM 1650] and the specimen previously cataloged as the holotype (FMNH 53206) is identified as T. brevis.
期刊介绍:
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