PHOSPHATOCOPINE OSTRACODES WITH PRESERVED APPENDAGES FROM THE UPPER CAMBRIAN OF SWEDEN
PHOSPHATOCOPINE OSTRACODES WITH PRESERVED APPENDAGES FROM THE UPPER CAMBRIAN OF SWEDEN
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DOI：
10.1111/j.1502-3931.1979.tb01234.x
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发表时间：
1979-01-01
期刊：
影响因子：
1.5
通讯作者：
MULLER, KJ
中科院分区：
文献类型：
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作者：
MULLER, KJ
400多个标本的磷甲片介形虫。代表了西哥特的不同蜕皮阶段。法利特人和赫斯兰多人已经被发现，身体和附属结构被保存得非常详细。来自瑞典上寒武统的炭疽岩和来自该地区的漂流巨石。磷酸盐化这些结构的二次磷酸盐化，导致保存。被广泛讨论。它甚至包括内板，但腹部没有保存。下腹部和下唇发育良好。大触角由一个可能有两个足节的基足和一个长的外足组成，外足有多达18个足节，长刺，形成一个游泳器官，以及一个由两到三个足节组成的宽的内足。触角的二分支组织是一个独特的，最原始的特征，具有系统发育的意义。触角和多达四对附加的附属物也是双枝的，与触角相似，尚未分化为专门的功能。只有最后一对是单枝的，但第二个分支可能已经在随后的蜕皮阶段没有代表的材料。食物进入口中的运动是通过触角和触角的末端实现的，在介形虫的发育过程中，这一功能向后转移到其他附属物，并反映在最近介形虫的个体发育趋势中。的phosphatocopines是nectobenthic，过滤浮游生物的饲料。
More than 400 specimens of phosphatocopine ostracodes. representing different moult stages ofVestrogothia. FalitesandHesslandonahave been recovered, with body and appendage structures preserved in minute detail. from anthraconites in the Upper Cambrian of Sweden and drift boulders deriving from that area. The secondary phosphatization of these structures, leading to preservation. is extensively discussed. It comprises even the inner lamella, but the abdomen is not preserved. Hypostome and lower lip are well developed. The large antennula is composed of a basipodite with probably two podomeres and a long exopodite with up to 18 podomeres bearing long spines, forming a natatory organ, and a broad endopodite of two to three podomeres. The biramous organization of the antennula is a unique, most primitive feature of phylogenetic significance. The antennae and up lo four additional pairs of appendages are also biramous and similar to the antennulae, not yet differentiated for specialized functions. Only the last pair is uniramous, but a second branch may have developed in subsequent moult stages not represented in the material. The movement of food into the mouth was achieved by the endites of antennulae and antennae, a function transferred backwards to other appendages during the course of ostracode phylogeny and reflected in ontogenetic trends among Recent ostracodes. The phosphatocopines were nectobenthic, filtering plankton feeders.