Inner ear and otolith morphology of climbing perch Anabas testudineus (Anabantidae)статья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.
Аннотация:The inner ear position and structure, related parts of the brain and neurocranium, as well as themorphology of the lapillus, sagitta, and asteriscus, are described in climbing perch, an obligate air-breathingfish capable of terrestrial movements. The olfactory bulbs and telencephalon are well developed. The dorsalprotrusion with two symmetrical lobes is observed on the dorsal posterior surface of the telencephalon. Thealmost triangular rear part of the brain capsule and a narrow posterior region of the neurocranium representthe border of the suprabranchial chamber. The pars superior of the inner ear is located along the internal triangular part of the brain capsule, and both crus communis and ductus semicircularis posterior are locatedclose to each other in the narrow extreme rear region of the brain capsule. The sacculus is enclosed in the largeoval bony capsule (saccular swelling), and the sagitta is large with the average otolith length–total body length(TL) ratio equal to 0.06. Linear growth of the lapillus and sagitta is characterized by negative allometry inrelation to body length. Despite the slow growth rate of the lapillus, its shape substantially changes during thegrowth of the fish 36–205 mm TL that, most likely, reflects increasing locomotion complexity. Possible adaptations of climbing perch inner ear to terrestrial movements are discussed.