Branching patterns of trunk lateral line nerves in Pleuronectiformes: uniformity and diversity |
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Authors: | Emi Fukuda Masanori Nakae Ryu Asaoka Kunio Sasaki |
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Institution: | (1) Laboratory of Marine Biology, Faculty of Science, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan;(2) Collection Center, National Museum of Nature and Science, 3-23-1 Hyakunin-cho, Shinjuku-ku Tokyo, 169-0073, Japan; |
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Abstract: | Branching patterns of the trunk lateral line nerves were studied in 46 pleuronectiform species, representing nine families
in two suborders. The dorsal fin longitudinal ramus (DFLR), derived from the main nerve (horizontal septum lateral line nerve),
passed closely along the course of the middle trunk lateral line in all specimens examined, the dorsal longitudinal collector
nerve (DLCN) partly coalescing with the DFLR along the arched part of the lateral line in Psettodes
erumei (Psettodoidei), compared with the entire length of the latter in all other species (Pleuronectoidei). Citharidae, Paralichthyidae,
and Pleuronectidae were characterized by having a simple, elongated dorsal ramule; Bothidae was unique in having more than
one dorsal ramule, forming a ladder-like network and peripherally giving off numerous minute branches; Poecilopsettidae and
Samaridae possessed a few, short dorsal ramules; Soleidae and Cynoglossidae were characteristic in having a dendritic dorsal
ramule. Secondary modifications of the course of the middle trunk lateral line were detected by nerve information, the arched
part of the lateral line having been secondarily highly elevated in some genera of Pleuronectidae, but secondarily straightened
in Samaridae. |
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