摘要
通过对眼斑猛虾蛄(Harpiosquillaannandalei)幼体各发育期的连续取样,在显微镜或解剖镜下系统地观察各发育期的形态变化及生长特征并描图。眼斑猛虾蛄假蚤状幼体经11次蜕皮,在水温24～27℃,盐度25.4～29.0的条件下,历时49d,发育变态成仔虾蛄;第Ⅰ期假蚤状幼体(Z1)体长1.75～1.83mm,头部有一长额角,头胸甲形状似龟壳,有1对腹侧齿,四角有刺,后部中间有一较长棘刺;第Ⅵ期头胸甲形状渐变成梯形,腹侧齿5对,第一触角中鞭萌芽,第二触角内肢发育呈短芽状,第Ⅷ期头胸甲左右两侧边缘开始渐向下弯卷;第Ⅺ期(Z11)体长15.10～17.20mm,第二触角内肢发育成鞭状且分为14～16节,尾肢外肢2节,内肢1节;Ⅰ期仔虾蛄体长14.50～16.10mm,长额角消失,头胸头形状仍为梯形,但光滑无腹侧齿,前侧角圆形,后侧角有二个缺角,这是该种的特征,后部中间棘刺消失,头胸甲占体长的比例明显缩小,形似成体虾蛄。眼斑猛虾蛄的幼体与黑斑口虾蛄的幼体的形态存在一定差异,主要表现在头胸甲与体长的比例,头胸甲的长宽比及第二触鳞片刚毛数和尾节的侧小齿、中间小齿和亚中间小齿的齿数。
Based on the continuous samples of the larvae development of Harpiosquilla annandalei Kemp, the morphology and the development features were observed under microscope and dissecting microscope and their pictures were drawn. The result showed that after experiencing 11 molts at water temperature 24 - 27 ℃ and salinity 25.4 - 29.0, the pseudozoea of H. annanda/ei. . metamorphose into juvenile squilla and this process takes 49 days to complete. The body length at pseudozoea Ⅰ is 1.75 - 1.83 mm. Its head has a long rostrum. The shape of the carapace with one pair of ventral teeth in edge, a spine in each comers and a long spine in the middle of retral part is similar to a turtle shell. At pseudozoea stage Ⅵ, the carapace with 5 pairs of lateral abdomen teeth in edge gradually developed, and then looks like a trapezium. The mesial flagellum bud appears on the first antenna and the endopodite in the second antenna develops into a short bud. The telson appendage presents when the larva develops into pseudozoea Ⅶ. The two edges of carapace begin to bend and cover downwards when the larva is pseudozoea Ⅶ. At pseudozoea Ⅺ, its body length is 15.10- 17.20 mm. The endopodite in the second antenna develops and become a long flagellum divided into 14- 16 segments. The exopodite of telson has 2 segments and the endopodite has 1 segment. The body length of juvenile squilla at stage I is 14.5 - 16.10 mm. The long rostrum disappears and the carapace is still in trapezium shape while smooth and without ventral teeth. Its anterior cumu is rounded and its posterior comu has two nicks which are the distinguishing feature for this species. Then the mid spines in the retral carapace disappear. The rate of carapace length compared to body length decreases obviously. The larvae in this stage look like a miniature adult squilla. The larval morpha of H. annandaiei has some differences from those of O. kempi and O. oratoria. The differences can be identified by the rate of the carapace length compared to the body length, the rate between the length and width of carapace, the scale seta numbers in the second antenna and the lateral, mid, sub-mid tooth numbers in the telson.
出处
《水产学报》
CAS
CSCD
北大核心
2006年第1期42-49,共8页
Journal of Fisheries of China
基金
福建省海洋与渔业局资助项目(闽海渔科0314号)
关键词
眼斑猛虾姑
假蚤状幼体
形态发育
HarpiosquiUa annandalei
pseudozoea larvae
morphological development
