形態學資料 Tylochromis praecox
檢索表
Abnormalities
主要參考文獻 Stiassny, M.L.J., 1989
形態描述的性別
Bones in OsteoBase

性別內容

特殊器官
不同的外表 always different morphology between mature adults
不同的顏色
附註 Sexual dimorphism of the buccal dentition pronounced, and already clearly evident in small specimens (9.5cm SL); male dentition is considerably coarser than that of females of equivalent sizes, and all teeth are larger and fewer in number (Ref. 52346).

稚魚與成魚的特徵描述

顯著的特徵
側面體型
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

Diagnosis: upper lateral line extending full length of dorsal fin base and descending a row before proceeding the length of 3 or more scales; 15 gill-rakers along lower limb of first arch; 35-37 lateral line scales; relatively large headed and deep bodied; pectoral fin long, usually extending to level of spinous anal fin (Ref. 52346).

Description: moderately deep-bodied (Ref. 52307, 52346). Head profile steep, but somewhat flattened above the eyes (Ref. 52307). Strong dorsal body curvature and ventral flattening; predorsal profile rises steeply over snout, usually interrupted by slight thickening of interobital region, then continues rising smoothly to dorsal fin origin; deepest body depth along back at origin of dorsal fin; mouth more or less along horizontal when closed; lower pharyngeal jaw weakly developed; lips moderately fleshy and thickened; inferior vertebral apophysis of standard Tylochromis type, with minor contribution of 4th vertebra forming a buttress for 3th vertebral process; gill-rakers along lower limb of first arch stout, crenate and well spaced; first few hypobranchial rakers often simple and somewhat elongate; epibranchial rakers relatively broad; 35-37 lateral line scales; upper lateral line extensive, extending full length of dorsal fin base and descending a row before proceeding length of 3 or more scales; terminal canal bearing scales descend a scale row and canal continues for 3-4 scales; dorsal, ventral and median lateral line branches on caudal fin well developed, extending to fin periphery; caudal fin very densely scaled to fin periphery; dorsal fin spines increase in length to 5th and then are more or less equal in length; anal fin rounded; pectoral fin moderately long, usually extending to level of spinous anal fin; first branched pelvic ray produced and filamentous, reaching beyond level of spinous anal fin in some individuals; caudal fin broad and roundly emarginate (Ref. 52346).

Coloration: body and lips silvery; head, cheeks and opercula of adults more golden; body often with horizontal yellowish lines; larger specimens (males?) with black spots on the soft dorsal, anal and caudal fins (Ref. 52307). Preserved specimens: body uniform light brown; upper lip black and ethmoid region dark dusky grey in male specimens; nape band is very strongly pigmented, short, broad and not extending down to the diffuse opercular blotch; lower lip, upper lip membranes and branchiostegal membranes white; no traces of any vertical bands behind the nape band; dorsal fin smokey grey with rows of numerous pale maculae; caudal stripes fine and numerous; preserved females exhibit similar, but muted, body and dorsal fin markings; faint traces of vertical stripes only present in the smallest individuals (Ref. 52346).

鑑定難易度

分節特性 Tylochromis praecox

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 0
鰓裂 (僅限於鯊魚/ 魟魚)
鰓耙
在下肢上 15 - 15
上枝鰓耙 8 - 9
總數
脊椎骨
肛門前
總數 28 - 28

背鰭 (s)

屬性
鰭數 1
離鰭號碼 Dorsal   0
Ventral  0
棘總數 14 - 15
軟條總數 13 - 14
脂鰭 absent

尾鰭

屬性

臀鰭 (s)

鰭數 1
棘總數
軟條總數 7 - 7

偶鰭

胸鰭 屬性  
脊椎     
軟條   
骨盤的 屬性  
位置    
脊椎     
軟條   
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