Page 155 - 《水产学报》2026年第2期

2 期 水 产 学 报 50 卷

Dfa

Afa
Nc
0.50 mm 1

Df
Nc
Hy

Ph
Af
0.50 mm 2

V Ns
Na

Hs
Fr Ha
1.00 mm 3

Na Ns

Hs
Ha
0.25 mm 4
Plate Ⅵ Formation and ossification of vertebral column
(1) 3.78 mm NL; (2) 6.08 mm NL; (3) 10.24 mm SL; (4) 12.89 mm SL. Af. anal fin; Df. dorsal fin; Dfa. dorsal fin anlage; Nc. notochord; V. vertebral
centra.
proceeding both anteriorly and posteriorly. This pat- have a highly specialised caudal fin, and the caudal-fin
tern appears to be the general pattern of ossification in skeleton evolved a high morphological diversity
[23]
Clupeiformes . within Teleostei [26-28] . The sequence of development of
During skeletal ontogeny, 7-9 predorsal (supran- cartilaginous elements, followed by ossification, is a
eurals) bones were counted. The nature and origin of common trend in vertebrate skeletal development as
[29]
these bones in fishes remain a subject of discussion. described by Arratia .
For instance, several hypotheses have been raised to In E. punctifer (present study), the formation of
try to interpret the homologies among supraneural ele- caudal fin supports started with hypural 1 and 2 and
ments, neural arches and dorsal proximal radials. In a parhypural. Ossification commenced from hypural 1
[24]
study , dorsal-fin and supraneural patterns among and then proceeded dorsally, with hypural 6 being the
adult percoids were examined leading to the conclu- last hypural to ossify, and epurals (1+2) and 3 were the
sion that these bones are homologous to the proximal last to ossify, a similar trend described in Engraulis
[30]
pterygiophores of the dorsal fin in teleosts. However, japonicus and in other clupeoid species [31-32] . On the
comparative developmental evidence indicates that contrary, in C. harengus (Clupeidae) and Danio rerio
supraneurals are not the serial homologues of ptery- (Cyprinidae) larvae, the formation of caudal fin com-
[25]
giophores . plex started with the formation of parhypural and
Compared to other fish-like vertebrates, teleosts hypural 1 [19,33] .

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