形态学资料 Sauvagella robusta
检索表
Abnormalities
主要参考文献 Stiassny, M.L.J., 2002
形态描述的性别
Bones in OsteoBase

性别内容

特殊器官
不同的外表
不同的颜色
附注

稚鱼与成鱼的特徵描述

显着的特徵 none
侧面体型 elongated
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 superior
Type of scales
鉴别

Diagnosis: Body relatively elongate; belly rounded, without pre-pelvic scutes, but a pelvic scute present with slender lateral arms; gillrakers reduced in number, 15-19 gillrakers on lower limb of first arch; pelvic fin with 1 unbranched and 7 branched finrays, a little anterior to dorsal fin origin; last two anal finrays not separate from others (Ref. 33664). It is distinguished from Sauvagella madagascariensis by lower vertebral number, 38-40 vs. 41-43; deeper body, 20.8-27.4% of standard length vs. 15.8-21.1%; a shorter snout, 18.5-26.6% of head length vs. 26.2-33.7%; and a lower anal fin ray count, 13-17 vs. 17-19 (Ref. 33664).

Description: Robust, relatively deep-bodied, even in small specimens, with a straight dorsal profile; ventrum markedly rounded to caudal peduncle; snout short and straight, with slightly upturned mouth; gape inclination approximately 40° to horizontal; upper jaw to vertical through anterior margin of orbit (Ref. 33664). Pre-maxilla with short dentigerous arm, extending over anterior third of maxillary shaft; pre-maxillary teeth few, 5-8, small unicuspids in single row; maxilla usually with smooth ventral flange, slightly serrate in large individuals; single, tear-shaped posterior supramaxilla; lower jaw teeth few, in single row of small unicuspids restricted to region of symphysis (Ref. 33664). Relatively few robust rakers on lower limb of first arch, 15-19; 7-9 hypobranchial rakers, mostly blunt and conical, increasing in length to ceratobranchial; 10-12, elongate, widely spaced rakers on ceratobranchial; usually 1 raker in angle of arch, included in count of lower limb, and 9-12 epibranchial rakers; a row of short blunt rakers on inner face of third epibranchial (Ref. 33664). Dorsal fin short-based, relatively tall, usually with 3 unbranched and 8-12 branched rays; entire fin situated anterior to anal origin; anal fin with 3-4 unbranched and 11-14 branched rays, origin posterior to end of dorsal; ventral margin of anal broadly incised; pectoral fin short, with 11 rays, reaching midway to pelvic fin origin; pelvic fin with 1 unbranched and 7 branched rays, its insertion anterior to dorsal fin origin; caudal fin forked (Ref. 33664). Scales are cycloid (Ref. 33664). Belly rounded, lacking pre-pelvic scutes and post-pelvic scutes; pelvic scute with slender lateral arms (Ref. 33664). Vertebral counts 38-40 with 20-22 precaudal and 18-19 caudal centra; first supraneural bone flat and platelike, remaining 12-13 short and tubular; hyoid arch with 5 branchiostegal rays, first is narrow and filamentous, the second variously expanded, and rest are flat and broad; a single row of small teeth on ectopterygoid, small toothpatch on median face of endopterygoid, rodlike palatine edentate even in large individuals (Ref. 33664).

Colouration: In life, uniformly pale creamy yellow with some silvery iridescence on chest and ventrum (Ref. 33664). Preserved specimens are pale cream or dark yellow with faint pigment ringing dorsal scale margins, slightly darkening the dorsum; a trace of a thin midlateral band of dark pigment restricted to posterior half of body; dorsal, anal and caudal fins with a line of dark pigment along base at body wall; pupil situated more-or-less in mid-eye, iris silver or black (Ref. 33664).

鉴定难易度

分节特性 Sauvagella robusta

侧线 打断: No
侧联机的鳞片
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 15 - 19
上枝鳃耙 9 - 12
总数
脊椎骨
肛门前
总数 38 - 40

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 11 - 15
脂鳍 absent

尾鳍

属性 forked; more or less normal

臀鳍 (s)

鳍数 1
棘总数 0 - 0
软条总数 13 - 17

偶鳍

胸鳍 属性  more or less normal
脊椎     0
软条   11 - 11
骨盘的 属性  more or less normal
位置    abdominal  before origin of D1
脊椎     0
软条   8 - 8
主要参考文献 (例如 9948)
字汇 ( 例如 cephalopods )
Comments & Corrections
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