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首页> 外文期刊>Fishery Bulletin >Morphometric differentiation in small juveniles of the pink spotted shrimp (.Farfantepenaeus brasiliensis) and the southern pink shrimp (F. notialis) in the Yucatan Peninsula, Mexico
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Morphometric differentiation in small juveniles of the pink spotted shrimp (.Farfantepenaeus brasiliensis) and the southern pink shrimp (F. notialis) in the Yucatan Peninsula, Mexico

机译：墨西哥尤卡坦半岛粉红色斑点虾（.Farfantepenaeus brasiliensis）和南部粉红色虾（F. notialis）小幼体的形态学分化

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The morphometric and morphological characters of the rostrum have been widely used to identify penaeid shrimp species (Heales et al., 1985; Ball et al., 1990; Pendrey et al., 1999). In this setting, one of the constraints in studies of penaeid shrimppopulations has been the uncertainty in the identification of early life history stages, especially in coastal nursery habitats, where recruits and juveniles dominate the population (Ball et al., 1990; Perez-Castaneda and Befeo, 2001). In the western Atlantic Ocean, Perez-Far fante (1969, 1970, 1971a) described diagnostic characters of the genus Farfantepenaeus that allowed identification of individuals in the range of 8-20 mm CL (carapace length) on the basis of the following morphological features: 1)changes in the structure of the pe-tasma and thelycum; 2) absence or presence of distomarginal spines in the ventral costa of the petasma; 3) the ratio between the keel height and the sulcus width of the sixth abdominal somite; 4) the shape and positionof the rostrum with respect to the segments and flagellum of the antennule; and 5) the ratio between rostrum length (RL) and carapace length (RL/CL). In addition, she classified Farfantepenaeus into two groups according to the shape and position of therostrum with respect to the segments and flagellum of the antennule and the ratio RL/CL: 1) F. duorarum and F. notialis: short rostrum, straight distally, and the proximodorsal margin convex, usually extending anteriorly to the end of distal antennular segment, sometimes reaching to proximal one-fourth of broadened portion of lateral antennular flagellum, with RL/CL <0.75; and 2) F. aztecus, F. brasiliensis, F. paulen-sis, andF. subtilis: long rostrum, usually almost straight along the entire length, extending anteriorly beyond the distal antennular segment, sometimes reaching to the distal one-third of broadened portion of lateral antennular flagellum, with RL/CL >0.80. Perez-Farfante stressed that, for the recognition to species level of juveniles <10 mm CL, all the characters listed above should be considered because occasionally one alone may not prove to be diagnostic. However, the only characters that could be distinguished for small juveniles in the range 4-8 mm CL are those defined on the rostrum. Therefore, it has been almost impossible to identify and separate small specimens of Farfantepenaeus (Perez-Farfante, 1970, 1971a; Perez-Farfante and Kensley, 1997).
机译：讲台的形态和形态特征已被广泛用于识别对虾物种（Heales等，1985; Ball等，1990; Pendrey等，1999）。在这种情况下，对虾种群研究的制约因素之一是在确定早期生命史阶段尤其是在沿海苗圃生境中，其中新兵和少年占主导地位的不确定性（Ball等，1990; Perez-Castaneda）和Befeo，2001年）。在西大西洋，Perez-Far fante（1969，1970，1971a）描述了Farfantepenaeus属的诊断特征，该特征允许根据以下形态特征识别8-20 mm CL（甲壳长度）范围内的个体：1）眼皮和斜纹肌的结构变化; 2）气肿的腹肋中不存在螺旋状棘; 3）第六腹节龙骨的龙骨高度与沟宽之比; 4）相对于小节的节段和鞭毛的讲台的形状和位置; 5）讲台长度（RL）与甲壳长度（RL / CL）之比。此外，根据法氏囊相对于节段和鞭毛的形状和位置以及比率RL / CL，她将Farfantepenaeus分为两类：1）F. duorarum和F. notialis：短讲台，远端笔直，前外侧边缘凸起，通常向前延伸至远端瓣膜节段的末端，有时到达近端外侧瓣膜鞭毛部分的近四分之一，RL / CL <0.75;和2）F. aztecus，F。brasiliensis，F。paulen-sis和F.枯草：长的讲台，通常在整个长度上几乎笔直，向前延伸到远侧的眼前节，有时到达远侧的眼前鞭毛的三分之一，RL / CL> 0.80。 Perez-Farfante强调，要识别小于10毫米CL的未成年人，应考虑上述所有特征，因为偶尔只有一个可能无法诊断。但是，对于在4-8 mm CL范围内的小型青少年，唯一可以区分的字符是在讲台上定义的字符。因此，几乎不可能鉴定和分离出法氏菌的小标本（Perez-Farfante，1970，1971a; Perez-Farfante和Kensley，1997）。

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