形態學資料 Squalus acanthias
檢索表
Abnormalities
主要參考文獻 White, W.T., G.K. Yearsley and P.R. Last, 2007
形態描述的性別
Bones in OsteoBase

性別內容

特殊器官
不同的外表
不同的顏色
附註

稚魚與成魚的特徵描述

顯著的特徵
側面體型 elongated
橫切面 compressed
頭部背面描繪
眼的類型 more or less normal
口/吻尖的類型 more or less normal
口的位置 sub-terminal/inferior
Type of scales placoid scales
鑑別

This moderately sized species is distinguished by the following set of characters: very slender body, abdomen width 7.2-9.2% TL; narrow head, width at mouth 7.9-10.2% TL; mouth width 1.7-2.2 times its horizontal prenarial length; moderately long snout, preoral length 2.2-2.5 times horizontal prenarial length, 8.5-9.8% TL; single-lobed anterior nasal flap; small dorsal fins, raked, first dorsal-fin height 1.1-1.3 times its inner margin length, second dorsal-fin height 0.7-0.9 times its inner margin length; origin of first dorsal-fin located just posterior to pectoral-fin free rear tips; exposed bases of dorsal-fin spines relatively narrow, 0.4-0.7% TL; short spine of first dorsal fin, exposed length 1.7-2.7% TL; pectoral-fin anterior margin 1.9-3.1 times its inner margin length; preventral caudal margin 1.9-2.6 times inner margin of pelvic fin; pale caudal fin with poorly demarcated, whitish margin, blackish caudal blotch at the apex of upper lobe, anterior margins of both lobes whitish in juveniles; dark caudal bar absent; dorsal and lateral surfaces of body bluish grey with an irregular array of moderately-large white spots; whitish ventrally; flank denticles tricuspid; monospondylous centra 41-45, precaudal centra 74-79, total centra 100-105 (Ref. 58446).

鑑定難易度

分節特性 Squalus acanthias

側線 打斷: No
側線上的鱗片
側線上鱗片數
側生系列的鱗片
側線上的鱗片列
側線下的鱗片列
尾梗周圍的鱗片
觸鬚
鰓裂 (僅限於鯊魚/ 魟魚) 5
鰓耙
在下肢上
上枝鰓耙
總數
脊椎骨
肛門前 75 - 81
總數 101 - 109

背鰭 (s)

屬性
鰭數 2
離鰭號碼 Dorsal   0 - 0
Ventral  0 - 0
棘總數 2 - 2
軟條總數 0 - 0
脂鰭 absent

尾鰭

屬性 heterocercal; asymmetric

臀鰭 (s)

鰭數
棘總數 0 - 0
軟條總數 0 - 0

偶鰭

胸鰭 屬性  more or less normal
脊椎     0
軟條   0 - 0
骨盤的 屬性  more or less normal
位置    abdominal  behind origin of D1
脊椎     0
軟條   0 - 0
主要參考文獻 (例如 9948)
字彙 ( 例如 cephalopods )
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