Development of the dorsal and anal fin in <i>Kneria stappersii</i> (Otomorpha: Gonorynchiformes)

Koch, Ann‐Katrin; Moritz, Timo; Thieme, Philipp

doi:10.1111/azo.12439

Cited by 2 publications

(1 citation statement)

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“…For the distinction between “fin stay” and “true pterygiophore,” we followed Weitzman ( 1962 ), who used the term for the last element in the anal und dorsal fin, respectively. The fin stay lacks a distal radial as well as associated fin rays (at least in adults) and develops later than the “true pterygiophores” (see Fischbach et al, 2022 ; Koch et al, 2022 ). The fin stay was also used as a landmark to divide the Gemminger bones into anterior and posterior portions.…”

Section: Methodsmentioning

confidence: 99%

Ontogeny reveals the origin of Gemminger bones in Mormyridae

2023

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Mormyridae are well known and intensively studied for their weak electric organ discharges, which facilitate communication and orientation. The Gemminger bones of Mormyridae are located next to the electrical organ in the caudal peduncle; however, they have not attracted much interest until recently. Therefore, we investigated the diversity of Gemminger bones in mormyrids and studied their ontogenetic development in Mormyrus rume proboscirostris. Gemminger bones are paired, thin, elongated ossifications lying on the dorsal and ventral sides of the caudal peduncle, and usually reach anterior well below the dorsal and anal fin bases. Ontogeny revealed that they are not intermuscular ossifications, as suspected based on the anatomical position of this structure and the systematic position of the mormyrids. Instead, they are membrane ossifications that originate from the fin stays of the dorsal and anal fins.

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Section: Methodsmentioning

confidence: 99%