Benmansour Sana , Benmessaouda Hadil , Drifi Naima
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引用次数: 0
摘要
本文报道了阿尔及利亚东北部Bellezma-Batna山脉Cenomanian矿床中两种棘类动物Macraster douvillei (Gauthier)和Mecaster pseudofourneli (psamron and Gauthier)的生长解剖异常。这样的话题在阿尔及利亚还是第一次被报道。大量的收集(400个标本)使得区分几种罕见的病理成为可能,每一种都有解释性的插图说明。提出了三种与五元体直接相关的变形。它们通常是由于额外的生长区(6个ambulacra),以缺失生长区(4个ambulacra)为代表的完整四联体以及ambulacra的收缩或窒息造成的。一旦幼虫进入变态阶段,在雏形中就会出现异常,或者在幼雏中很快出现异常。它们可能会改变板的排列和测试的总体形状,或者相反,导致局部变形,影响ambulra的排列或形状等。这些畸形是由内在(遗传)或外在(环境)条件造成的。
Growth anatomical anomalies in Cenomanian echinoids of the Bellezma-Batna Mountains (NE Algeria)
This article reports cases of growth anatomical anomalies in two echinoid species, Macraster douvillei (Gauthier) and Mecaster pseudofourneli (Péron and Gauthier), from the Cenomanian deposits of the Bellezma-Batna mountains (northeastern Algeria). Such a topic is first reported in Algeria ever. The large collection (400 specimens) made it possible to distinguish several types of these rare pathologies, each one being illustrated by explanatory drawings. Three types of deformation directly concerning the pentamery, are presented. They are most often resulting from an additional growth zone (6 ambulacra), a complete tetramery represented by a missing growth zone (4 ambulacra) and constrictions or strangulation of the ambulacres. Abnormalities can develop in the rudiment as soon as the larva enters metamorphosis, or shortly afterwards in juvenile broods. They may alter the plate arrangement and the general shape of the test or, on the contrary, result in local deformations, influencing the arrangement or shape of the ambulacra, etc. These malformations resulted from either intrinsic (genetic) or extrinsic (ambiental) conditions.
期刊介绍:
The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa.
The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.