Abstract
We examined the morphology and ultrastructures of fertilized egg envelopes of glowlight tetra (Hemigrammus erythrozonus) belong to Characidae using light and electron microscopes.The fertilized eggs were spherical, transparent, demersal, adhesive, and have no oil droplet. The perivitelline space was well-developed and the micropyle was surrounded by 15–20 uplifted lines of egg envelope in a spoke like pattern. The outer surface of egg envelope was rough side with grooves. Also, the total thickness of the fertilized egg envelope was about 2.1–2.3 μm, and the fertilized egg envelope consisted of two layers, an outer adhesive electron-dense layer with grooves and three feather-like lamellae layers. Collectively, these morphological characteristics of fertilized egg and micropyle with spoke-like structure showed family Characidae specificity, and ultrastructures of outer surface and section of fertilized egg envelope showed species specificity.
Highlights
The glowlight tetra (Hemigrammus erythrozonus Durbin 1909) is a teleost belong to Characidae, Characiformes, and Actinopterygii
In Characidae, the ultrastructure of fertilized egg envelope has been studied in Hemigrammus ocellifer, Gymnocorymbus ternetzi, Hemigrammus caudovittatus (Kim et al 1996) and Hyphessobrycon serpae (Kim et al 2005)
We found special micropyle structure from fertilized egg envelope of 4 species all belonging to Characidae
Summary
The glowlight tetra (Hemigrammus erythrozonus Durbin 1909) is a teleost belong to Characidae, Characiformes, and Actinopterygii. In Characidae, the ultrastructure of fertilized egg envelope has been studied in Hemigrammus ocellifer, Gymnocorymbus ternetzi, Hemigrammus caudovittatus (Kim et al 1996) and Hyphessobrycon serpae (Kim et al 2005). In these four species belonging to Characidae, the fertilized eggs are transparent, demersal, and spherical type. (2019) 49:8 of fertilized egg, and compared the ultrastructures of outer surface, micropyle, and section of fertilized egg envelopes under the light and electron microscopes from the other a species, Hemigrammus erythrozonus, Characidae to find out whether these structures have the species, genus or family specificity
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