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Larval description and chaetotaxic analysis of Gyrinus monrosi MOUCHAMPS, 1957

机译:Gyrinus monrosi MOUCHAMPS,1957年的幼虫描述和骨架分类分析

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摘要

The three larval instars of the Neotropical Gyrinus (Oreogyrinus) monrosi Mouchamps, 1957 (Coleoptera: Gyrinidae) are described and illustrated for the first time including detailed morpho-metric and chaetotaxic analyses of the cephalic capsule, head appendages and legs. Larvae of Gyrinus Muller, 1764 are diagnosed by the following combination of characters: cephalic capsule not constricted at level of occipital region; medial lobe of frontoclypeus with four inconspicuous teeth; presence of a mandibular retinaculum; lacinia broad, indented apically; claws with basoventral spinulae. Larvae of the subgenus Oreogyrinus Ochs, 1935 have the medial hooks of the abdominal segment X slightly longer than the lateral hooks, whereas in the subgenus Neogyrinus Hatch, 1925 the medial hooks are much shorter than the lateral ones. Regarding chaetotaxy, Gyrinus differs from Andogyrus Ochs, 1924 and Dineutus Macleay, 1828 in the absence of additional setae on the mandible, the distal position of pore MXg and the presence of seta TR2, from Orectochilus Lacordaire, 1835 in the shape of the pretarsal setae PT1 and PT2, and from all other gyrinid genera with known larvae except Aulonogyrus Motschulsky, 1853 in the presence of a row of robust hook-like additional setae on the dorsointernal margin of the stipes.
机译:首次描述和说明了1957年新热带陀螺(Oreogyrinus)Monrosi Mouchamps(鞘翅目:Gyrinidae)的三只幼虫,包括对头capsule,头附属物和腿的详细形态学和变位分析。 Gyrinus Muller(1764)的幼虫通过以下特征组合诊断:头枕未在枕骨区域水平收缩;前额叶内侧叶,具四个不明显的牙齿;下颌视网膜的存在;宽广的紫胶质,顶切爪与基底腹棘。 Oreogyrinus Ochs属的幼虫,1935年,腹节X的内侧钩比外侧钩稍长,而1925年的Neogyrinus Hatch属的内侧钩比外侧钩短得多。关于椎间融合术,Gyrinus与1924年的Andogyrus Ochs和1828年的Dineutus Macleay不同,在下颌骨上没有额外的刚毛,毛孔MXg的远端位置和1835年的Orectochilus Lacordaire的刚毛TR2存在于前齿骨刚毛的形状PT1和PT2,以及所有其他具有已知幼虫的陀螺类,除了Aulonogyrus Motschulsky(1853年)外,在剑柄的背内侧边缘上有一排健壮的钩状附加刚毛。

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  • 来源
    《Koleopterologische Rundschau》 |2010年第2010期|p.1-14|共14页
  • 作者单位

    CONICET - Laboratorio de Entomologia, Dpto. de Biodiversidad y Biologia Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Av. Int. Guiraldes s/n, Ciudad Universitaria, 1428 Buenos Aires, Argentina;

    rnCONICET-LIESA, Laboratorio de Investigaciones en Ecologia y Sistemdtica Animal, Universidad Nacional de La Patagonia, San Juan Bosco, Sarmiento 849, 9200, Esquel, Chubut, Argentina;

    rnDivision Entomologia, Museo de La Plata, Paseo del Bosque s/n, La Plata, 1900;

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  • 正文语种 eng
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  • 关键词

    coleoptera; gyrinidae; larva; chaetotaxy; morphometry; neotropical region;

    机译:鞘翅目犬科幼虫;tax术形态学新热带地区;

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