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

Asaoka, Ryu; Nakae, Masanori; Sasaki, Kunio

doi:10.1007/s10228-013-0373-8

Cited by 15 publications

(13 citation statements)

References 28 publications

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“…The superficial neuromasts on the head and trunk appear to comprise at least one additional component (or module) of the lateral line system, which demonstrates developmental trajectories and evolutionary trends different from those of the canal neuromasts [58,70]. The hypothesis that the cranial lateral line canal system is modular is also supported by the stereotyped location of canal neuromasts within individual canal segments (Figure 4), which is the result of neuromast-centered canal morphogenesis (Figures 2, 7 and 8), and the association of different lateral line canals with different dermal bones (Figure 1; [60,71]) that have distinct structural attributes, functional roles, and are subject to different constraints within the skull [27,72,73].…”

Section: Discussionmentioning

confidence: 99%

“…The nature of the structural hierarchy that defines the cranial lateral line canal system strongly suggests a modular organization, which is defined as follows: 1) individual canal segments, 2) the series of canal segments that compose a lateral line canal (for example, SO1 to SO5, MD1 to SO5), 3) the portions of a canal in different dermal bones composed of one or more canal segments (for example, the portions of the SO canal in the nasal and frontal bones, and the portions of the MD canal in the dentary and anguloarticular bones), 4) each lateral line canal (for example, MD, SO, IO and PO canals), 5) the entire cranial lateral line canal system (all canals), and 6) the entire lateral line canal system (cranial and trunk canals). The superficial neuromasts on the head and trunk appear to comprise at least one additional component (or module) of the lateral line system, which demonstrates developmental trajectories and evolutionary trends different from those of the canal neuromasts [ 58 , 70 ]. The hypothesis that the cranial lateral line canal system is modular is also supported by the stereotyped location of canal neuromasts within individual canal segments (Figure 4 ), which is the result of neuromast-centered canal morphogenesis (Figures 2 , 7 and 8 ), and the association of different lateral line canals with different dermal bones (Figure 1 ; [ 60 , 71 ]) that have distinct structural attributes, functional roles, and are subject to different constraints within the skull [ 27 , 72 , 73 ].…”

Section: Discussionmentioning

confidence: 99%

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Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Bird

Webb

2014

EvoDevo

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BackgroundThe canals of the mechanosensory lateral line system are components of the dermatocranium, and demonstrate phenotypic variation in bony fishes. Widened lateral line canals evolved convergently in a limited number of families of teleost fishes and it had been hypothesized that they evolved from narrow canals via heterochrony and explore modularity in the lateral line system. Two species of cichlids with different canal phenotypes were used to test a hypothesis of heterochrony. Histological material prepared from ontogenetic series of Aulonocara stuartgranti (widened canals) and Tramitichromis sp. (narrow canals) was analyzed using ANCOVA to determine rates of increase in canal diameter and neuromast size (length, width) and to compare the timing of onset of critical stages in canal morphogenesis (enclosure, ossification).ResultsA faster rate of increase in canal diameter and neuromast width (but not length), and a delay in onset of canal morphogenesis were found in Aulonocara relative to Tramitichromis. However, rates of increase in canal diameter and neuromast size among canals, among canal portions and among canals segments reveal similar trends within both species.ConclusionThe evolution of widened lateral line canals is the result of dissociated heterochrony - acceleration in the rate of increase of both canal diameter and neuromast size, and delay in the onset of canal morphogenesis, in Aulonocara (widened canals) relative to Tramitichromis (narrow canals). Common rates of increase in canal diameter and neuromast size among canal portions in different dermatocranial bones and among canal segments reflect the absence of local heterochronies, and suggest modular integration among canals in each species. Thus, canal and neuromast morphology are more strongly influenced by their identities as features of the lateral line system than by the attributes of the dermatocranial bones in which the canals are found. Rate heterochrony manifested during the larval stage ensures that the widened canal phenotype, known to be associated with benthic prey detection in adult Aulonocara, is already present before feeding commences. Heterochrony can likely explain the convergent evolution of widened lateral line canals among diverse taxa. The lateral line system provides a valuable context for novel analyses of the relationship between developmental processes and the evolution of behaviorally and ecologically relevant phenotypes in fishes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Bird

Webb

2014

EvoDevo

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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: 98%

“…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

Foretich

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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“…Accordingly, SNs in mugilids can also be interpreted as ''paedomorphic'' CNs, their development having stopped at the second stage (i.e., groove). Asaoka et al (2014) encountered a similar situation in the primitive goby Rhyacichthys aspro, in which the lateral line scales were longitudinally grooved, each housing several neuromasts. In that study, such neuromasts were classified as CNs owing to the presence of a skin roof over each groove.…”

Section: Discussionmentioning

confidence: 99%

The trunk lateral line system and its innervation in Mugil cephalus (Mugilidae: Mugiliformes)

et al. 2014

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The trunk lateral line system and its innervation were examined in Mugil cephalus. Almost every scale had an open longitudinal groove that housed a superficial neuromast (SN), the total number of SNs being 550 (including 55 on the caudal fin). Grooved lateral line scales constituted 14 longitudinal rows (14 lateral lines), although each groove was independent, not forming a continuous common groove along adjacent scales. The lateral ramus of the posterior lateral line nerve gave off four characteristic ramules: the anteriormost two dorsal ramules extended strongly backward, innervating SNs on the dorsal surface of the trunk; the anteriormost ventral ramule was extensively ramified to innervate SNs on the anterior flank, passing ventrally in front of the pectoral fin base; and the fifth ventral ramule extended posteriorly close to the anal fin origin, innervating SNs on the ventral half of the middle flank. The remaining SNs were innervated by 29 dorsal, 33 lateral and 25 ventral ramules, excepting those on the caudal fin. The innervation pattern revealed that the sixth lateral line (from uppermost) was homologous with that typically found in teleosts, the others being considered as additional. The sixth lateral line was anteriorly regressive, suggesting that the high insertion of the pectoral fin on the trunk is a secondary condition.

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

Cited by 15 publications

References 28 publications

Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

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

The trunk lateral line system and its innervation in Mugil cephalus (Mugilidae: Mugiliformes)

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