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

Abstract

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.

Diversity and sexual dimorphism in the head lateral line system in North Sea populations of threespine sticklebacks, Gasterosteus aculeatus (Teleostei: Gasterosteidae)

“…Nevertheless, it has to be noted that the separation of PO, PT and ST is just functional. These neuromasts are innervated by the ramus supratemporalis of the posterior lateral line nerve (Ahnelt and Bohacek 2004;Asaoka et al 2011;Sato et al 2019) which innervates the neuromasts on the trunk, the tail and the caudal fin (Asaoka et al 2011;Ishida et al 2015;Sato et al 2019).…”

Estudio comparativo de escamas de las líneas laterales y corporales del Bacalao de profundidad <i>Dissostichus eleginoides</i> (Teleostei: Nototheniidae)

“…Los resultados de este trabajo indican que algunas escamas del sector medio, en especial en la LLM de ambos lados del tronco D. eleginoides se caracterizan por la ausencia de la abertura anterior. Esto sugiere que las escamas que presentan ambas aberturas se intercalan con aquellas sin una abertura anterior, hecho que no alteraría la funcionalidad de las escamas, ya que al estar superpuestas unas con otras, la corriente circulatoria creada en la escama con ambas aberturas traspasaría la información a la escama con abertura posterior, permitiendo con ello percibir la información hidrodinámica necesaria para que el pez determine la dirección, velocidad, tamaño y forma de los objetos dispuestos a su alrededor(Vogel & Bleckmann 2000, Modgans et al 2003, Ishida et al 2014, Ristroph et al 2015.…”