形態學資料 Hymenocephalus nascens
檢索表
Abnormalities
主要參考文獻 McMillan, P. and T. Iwamoto, 2014
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
頭部背面描繪
眼的類型
口/吻尖的類型
口的位置
Type of scales
鑑別

This species is distinguished by the following characters: pelvic rays usually 12-14 (elsewhere 11-13); total gill-rakers first arch (outer/inner) 17-22/23-28, second arch 22-28/22-26; no chin barbel; snout length 22-31% HL; orbit diameter 29-40% HL; suborbital width 10-14%HL, interorbital width 24-29%HL; most of the orbit, upper surface of snout, sides of head and trunk silvery or pale, ventral aspects of heed and trunk black; a prominent midlateral stripe of silvery (when fresh) or brownish (preserved) pigment running along trunk and tail (Ref. 97189). Additional distinguishing characteristics: pectoral fin rays 13-16; projecting snout, 20-26% HL; infraorbital width 11-16% HL; moderately long preopercular supporter, with obtuse angle at rear margin, 4-9% HL; ventral striae reaching to ½ distance from pelvic fin bases to periproct; otolith has moderately high predorsal lobe, with colliculi separated, closely placed across collum with a tendency to joining in large individuals, terminating at some distance from anterior and posterior rims of otolith; otolith length to height (OL:OH), 1.1-1.2; total colliculum length to pseudocolliculum length (TCL:PCL), 1.8-2.4 (Ref. 98298).

鑑定難易度

分節特性 Hymenocephalus nascens

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)
鰓耙
在下肢上
上枝鰓耙
總數
脊椎骨
肛門前
總數

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
脂鰭 absent

尾鰭

屬性

臀鰭 (s)

鰭數 1
棘總數
軟條總數

偶鰭

胸鰭 屬性  
脊椎     0
軟條   14 - 16
骨盤的 屬性  
位置    
脊椎     0
軟條   12 - 13
主要參考文獻 (例如 9948)
字彙 ( 例如 cephalopods )
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