Innervation of the lateral line system in Rhyacichthys aspro: the origin of superficial neuromast rows in gobioids (Perciformes: Rhyacichthyidae)

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• 作者：Ryu Asaoka (1)
  Masanori Nakae (2)
  Kunio Sasaki (1)
  
• 关键词：Canal neuromast ; Lateral line nerve ; Homology ; Neoteny
• 刊名：Ichthyological Research
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：61
• 期：1
• 页码：49-58
• 全文大小：810 KB
• 作者单位：Ryu Asaoka (1)
  Masanori Nakae (2)
  Kunio Sasaki (1)
  
  1. Laboratory of Marine Biology, Faculty of Science, Kochi University, 2-5-1 Akebono-cho, Kochi, 780-8520, Japan
  2. Department of Zoology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan
  
• ISSN：1616-3915

文摘

The lateral line system and its innervation were examined in the most primitive gobioid taxon, Rhyacichthys aspro (Rhyacichthyidae). The infraorbital canal was present, whereas superficial neuromast rows a and c, typically present on the cheek of gobioids, were absent. Because the infraorbital canal (absent in other gobioids) and the two rows were commonly innervated by the buccal ramus, the latter were categorized as replaced rows from canal neuromasts. On an innervation basis, rows b and d on the cheek were considered to comprise superficial neuromasts only in all gobioids. The trunk lateral line system comprised canal and superficial neuromasts, the former being included in the lateral line scales (each bearing 1- neuromasts arranged longitudinally along the direction of a groove). Absence of bony roofs in the lateral line system was proposed as a synapomorphy of Gobioidei, and a progressive neotenic shift in the lateral line system of the suborder discussed.