The innervation and adaptive significance of extensively distributed neuromasts in Glossogobius olivaceus (Perciformes: Gobiidae)

Asaoka, Ryu; Nakae, Masanori; Sasaki, Kunio

doi:10.1007/s10228-011-0263-x

“…Taste buds on the trunk have been exclusively described as innervated by the recurrent ramus of the facial nerve 40 . Superficial neuromasts have been described previously on the caudal fins of various fishes 37, 62, 63 , but not on adipose fins. Although we were able to observe nerves entering the adipose fin and extending anteriorly through the fin spine, we were unable to determine whether they terminated upon the superficial neuromasts.…”

Section: Discussionmentioning

confidence: 89%

Adipose fin development and its relation to the evolutionary origins of median fins

Stewart

¹

,

Ho

²

,

Hale

³

2018

Preprint

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The dorsal, anal and caudal fins of vertebrates are proposed to have originated by the partitioning and transformation of the continuous median fin fold that is plesiomorphic to chordates. Evaluating this hypothesis has been challenging, because it is unclear how the median fin fold relates to the adult median fins of vertebrates. To understand how new median fins originate, here we study the development and diversity of adipose fins. Phylogenetic mapping shows that in all lineages except Characoidei (Characiformes) adipose fins develop from a domain of the larval median fin fold. To inform how the larva’s median fin fold contributes to the adipose fin, we study Corydoras aeneus (Siluriformes). As the fin fold reduces around the prospective site of the adipose fin, a fin spine develops in the fold, growing both proximally and distally, and sensory innervation, which appears to originate from the recurrent ramus of the facial nerve and from dorsal rami of the spinal cord, develops in the adipose fin membrane. Collectively, these data show how a plesiomorphic median fin fold can serve as scaffolding for the evolution and development of novel, individuated median fins, consistent with the median fin fold hypothesis.

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“…Taste buds on the trunk have been exclusively described as innervated by the recurrent ramus of the facial nerve 42 . Superficial neuromasts have been described previously on the caudal fins of various fishes 39,63,64 , but not on adipose fins. Although we were able to observe nerves entering the adipose fin and extending anteriorly through the fin spine, we were unable to determine whether they terminated upon the superficial neuromasts.…”

Section: Discussionmentioning

confidence: 89%

Adipose fin development and its relation to the evolutionary origins of median fins

Stewart

¹

,

Bonilla

²

,

Ho

³

et al. 2019

Sci Rep

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The dorsal, anal and caudal fins of vertebrates are proposed to have originated by the partitioning and transformation of the continuous median fin fold that is plesiomorphic to chordates. Evaluating this hypothesis has been challenging, because it is unclear how the median fin fold relates to the adult median fins of vertebrates. To understand how new median fins originate, here we study the development and diversity of adipose fins. Phylogenetic mapping shows that in all lineages except Characoidei (Characiformes) adipose fins develop from a domain of the larval median fin fold. To inform how the larva’s median fin fold contributes to the adipose fin, we study Corydoras aeneus (Siluriformes). As the fin fold reduces around the prospective site of the adipose fin, a fin spine develops in the fold, growing both proximally and distally, and sensory innervation, which appears to originate from the recurrent ramus of the facial nerve and from dorsal rami of the spinal cord, develops in the adipose fin membrane. Collectively, these data show how a plesiomorphic median fin fold can serve as scaffolding for the evolution and development of novel, individuated median fins, consistent with the median fin fold hypothesis.

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“…At settlement, several hundred neuromasts are found in well-defined lines on the skin of the head, trunk and tail (Fig. 1 b: 28–31 dph) 27 , a complex pattern that is typical among gobies 47 , 48 but uncommon among other fishes.…”

Section: Resultsmentioning

confidence: 97%

“…However, it should be noted that some features of the sensory systems in E. lori are typical of gobies, but are relatively unusual among other fishes. These include reduced (developmentally truncated) lateral line canals accompanied by the proliferation of superficial neuromasts, absence of complex folding (lamellae) of the olfactory epithelium, and presence of a large sacculus containing a particularly large square saccular otolith in the inner ear 26 , 27 , 47 , 48 . Further analysis of sensory anatomy can be found in recent papers on the ontogeny of the olfactory organs and taste buds 26 , and mechanosensory lateral line 27 .…”

Section: Resultsmentioning

confidence: 99%

An integrative investigation of sensory organ development and orientation behavior throughout the larval phase of a coral reef fish

Majoris

¹

,

Foretich

²

,

Hu

³

et al. 2021

Sci Rep

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The dispersal of marine larvae determines the level of connectivity among populations, influences population dynamics, and affects evolutionary processes. Patterns of dispersal are influenced by both ocean currents and larval behavior, yet the role of behavior remains poorly understood. Here we report the first integrated study of the ontogeny of multiple sensory systems and orientation behavior throughout the larval phase of a coral reef fish—the neon goby, Elacatinus lori. We document the developmental morphology of all major sensory organs (lateral line, visual, auditory, olfactory, gustatory) together with the development of larval swimming and orientation behaviors observed in a circular arena set adrift at sea. We show that all sensory organs are present at hatch and increase in size (or number) and complexity throughout the larval phase. Further, we demonstrate that most larvae can orient as early as 2 days post-hatch, and they swim faster and straighter as they develop. We conclude that sensory organs and swimming abilities are sufficiently developed to allow E. lori larvae to orient soon after hatch, suggesting that early orientation behavior may be common among coral reef fishes. Finally, we provide a framework for testing alternative hypotheses for the orientation strategies used by fish larvae, laying a foundation for a deeper understanding of the role of behavior in shaping dispersal patterns in the sea.

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The innervation and adaptive significance of extensively distributed neuromasts in Glossogobius olivaceus (Perciformes: Gobiidae)

Cited by 21 publications

References 16 publications

Adipose fin development and its relation to the evolutionary origins of median fins

Adipose fin development and its relation to the evolutionary origins of median fins

Adipose fin development and its relation to the evolutionary origins of median fins

An integrative investigation of sensory organ development and orientation behavior throughout the larval phase of a coral reef fish

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