Institute of Marine Biotechnology, School of Life Sciences, Tsinghua University, Beijing 100084, China.
Sci China Life Sci. 2011 Feb;54(2):175-80. doi: 10.1007/s11427-010-4132-z. Epub 2011 Feb 14.
We report a unique shell margin that differed from the usual shell structure of Pinctada fucata. We observed empty organic envelopes in the prismatic layer and the formation of the nacreous layer in the shell margin. All the characteristics of the growing margin indicated that the shell was growing rapidly. To explain this anomaly, we propose the concept of "jumping development". During jumping development, the center of growth in the bivalve shell jumps forward over a short time interval when the position of the mantle changes. Jumping development explains the unusual structure of the anomalous shell and the development of annual growth lines in typical shells. Annual growth lines are the result of a discontinuity in the shell microstructure induced by jumping development.
我们报告了一个独特的壳缘，与珍珠贝通常的壳结构不同。我们在棱柱层中观察到了空的有机包被，并且在壳缘中形成了珍珠层。生长缘的所有特征都表明壳正在快速生长。为了解释这种异常，我们提出了“跳跃发育”的概念。在跳跃发育过程中，当外套膜位置发生变化时，双壳贝类壳的生长中心在短时间间隔内向前跳跃。跳跃发育解释了异常壳的异常结构和典型壳中年度生长线的发育。年度生长线是由跳跃发育引起的壳微结构不连续而产生的。
