Morphology Summary - Pellona ditchela
形态学资料 Pellona ditchela
检索表
Abnormalities
主要参考文献 Whitehead, P.J.P., 1985
形态描述的性别
Bones in OsteoBase

性别内容

特殊器官 no special organs
不同的外表 males alike females
不同的颜色 males alike females
附注

稚鱼与成鱼的特徵描述

显着的特徵 none
侧面体型  (shape guide) fusiform / normal
横切面 compressed
头部背面描绘 more or less straight
眼的类型 more or less normal
口/吻尖的类型 more or less normal
口的位置 terminal
天平类型 cycloid scales
鉴别

Diagnosis: Body moderately deep, compressed, belly with strongly keeled scutes, 17-20 pre-pelvic and 8-10 post-pelvic scutes, with a total of total 25-29 scutes (Ref. 188, 6867). Eye large; lower jaw projecting; upper jaw with a toothed hypomaxillary bone between hind tip of pre-maxilla and lower bulge of maxilla blade; lower gillrakers 22-27; dorsal fin origin near midpoint of body; pelvic fins present; anal fin with 34-42 finrays; scales with upper and lower vertical striae slightly overlapping each other at centre of scales (Ref. 188). It closely resembles Pellona dayi, which has only 20-21 lower gillrakers and the vertical scale striae not meeting at centre of scale; species of Ilisha have no hypomaxilla; other pristigasterids are much more slender and lack pelvic fins (Ref. 188).

Description: Body fairly deep and compressed, its depth 25 to 36% of standard length (Ref. 6867). Lower jaw very prominent, toothed hypomaxilla present in upper jaw; eyes large, about 30% of head length (Ref. 6867, 30573). Gillrakers 22-27 on lower arm of first arch (Ref. 188, 3259, 6867). Dorsal fin with 3-4 unbranched rays and 13-16 branched rays, its origin about midway between snout-tip and caudal fin base; pectoral fin with 1 unbranched ray and 13-17 branched rays; pelvic fins, with 1 unbranched ray and 6 branched rays, slightly in advance of dorsal-fin origin; anal fin fairly long, with 3-4 unbranched rays and 31-38 branched rays, its origin slightly behind dorsal-fin base (Ref. 3259, 6867). Scales on lateral line 37-44; scales with vertical striae discontinuous, but slightly overlapping in scale centre (Ref. 3259, 11441). Belly with strongly keeled scutes; 17-20 pre-pelvic scutes, 8-10 post-pelvic scutes, total 25-29 scutes (Ref. 3259, 6867).

Colouration: Back blue-brown, flanks silvery; fins hyaline (Ref. 3259, 6867).

鉴定难易度

分节特性 Pellona ditchela

侧线 打断: No
侧联机的鳞片 37 - 44
侧联机鳞片数
侧生系列的鳞片
侧联机的鳞片列
侧线下的鳞片列
尾梗周围的鳞片
触须
鳃裂 (仅限于鲨鱼/ 鱼)
鳃耙
在下肢上 22 - 27
上枝鳃耙
总数
脊椎骨
肛门前
总数

背鳍 (s)

属性 no striking attributes
鳍数 1
离鳍号码 Dorsal   
Ventral  
棘总数 0 - 0
软条总数 16 - 19
脂鳍 absent

尾鳍  (shape guide)

属性 forked; more or less normal

臀鳍 (s)

鳍数 1
棘总数 0 - 0
软条总数 34 - 42

偶鳍

胸鳍 属性  more or less normal
脊椎     0
软条   14 - 18
骨盘的 属性  more or less normal
位置    abdominal  beneath origin of D1
脊椎     0
软条   7 - 7
(例如 9948)
(例如 oophagy)
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意见 & 订正
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