Development of the olfactory organ of oviparous and viviparous cyprinodonts (Teleostei)1

Abstract

Summary The development of the olfactory organ of oviparous and viviparous cyprinodonts is described. Differences between both groups referring mainly to the sequence of formation of the nasal openings are discussed. These differences are thought to be related to ontogenetic characteristics not common to both groups (e. g. the formation of an extra‐embryonic pericardium). Résumé Le Développement de l'Appareil olfactif des Cyprinodontes ovipares et vivipares (Teleostei) Le développement de l'appareil olfactif des cyprinodontes ovipares et vivipares est décrit. Les différences entre Ies deux groupes concernant en particulier l'ordre de la formation des narines font l'objet d'une discussion. On suppose que ces différences ont un rapport avec des caractéristiques ontogénétiques qui ne sont pas communes aux deux groupes (p. e. formation du pericard extraembryonaire). Zusammenfassung Die Entwicklung des Geruchsorgans von oviparen and viviparen Zahnkarpfen (Teleostei) Die Entwicklung des Geruchsorgans von oviparen and viviparen Zahnkarpfen wird besdtrieben. Untersdsiede zwisdlen beiden Gruppen, die hauptsächlich die Reihenfolge in der Ausbildung der Riedloffnungen betreffen, werden diskutiert. Es wird angenommen, daβ diese Untersdtiede im Zusammenhang mit ontogenetisdlen Merkmalen stehen, die nidu beiden Gruppen gemeinsam sind (z. B. der Ausbildung eines extraembryonalen Perikards).

Olfactory Sensory Neuron Morphotypes in the Featherback Fish, Notopterus notopterus (Osteoglossiformes: Notopteridae)

“…These are however widespread in number of teleost fishes. 10,12,58,59,62-66 They are reported in Cyprinodonts, 37 catfish, swordtail and needlefishes 11 and in Zebrafish, Danio rerio . 13 …”

“…It is 35 µm in piranha, Serrasalmus nattereri , 35 35–55 µm in European eel, Anguilla anguilla 36 and 60–75 µm in swordtail, Xiphophorus helleri 37 which is folded to form olfactory lamellae. Number, shape and arrangement of lamellae vary considerably among different teleosts ranging from flat unfolded surface to multi-lamellar rosette.…”

Architectural pattern of different cells lining the olfactory epithelium of long-whiskered catfish, Sperata aor (Hamilton)

“…The folding on the lamellae of the olfactory epithelium increases the surface area of the epithelium as well as the sensitivities and efficacy of the olfactory organ (Zeiske et al, 1976). There seems to be no record on correlation and cellular variation of the olfactory epithelium and their role in sensory reception in teleost under examine.…”

The Influence of Fixatives on the Validity of Histological Preparations of Olfactory Organ in Teleostei

“…For the study of olfactory structures, diff erent methods are used such as light microscopy, scanning electron microscopy, and transmission electron microscopy. Th e most popular fi xatives are 2.5 % glutaraldehyde fi xative (Zielinski & Hara, 1988;Arvedlund et al, 2000Arvedlund et al, , 2007Cobcroft & Pankhurst, 2003;Pashchenko & Kasumyan, 2015, 2017, Carnoy fi xative (Devitsina & Radishcheva, 1989), 70 % ethanol (Chen & Arratia, 1994), formalin (Zeiske et al, 1976;Breucker et al, 1979;Yamamoto et al, 2004;Doldan et al, 2011;Kim &Park, 2016) and Bouin's solution (Jahn, 1972;Camacho et al, 2010;Doldan et al, 2011;Ghosh & Chakrabarti, 2016;Tytiuk et al 2018), Bouin-ethanol solution (Diaz et al, 2002).10 % formalin and Bouin's solution are commonly used for histological studies of olfactory structures in Teleostei.…”