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Systematic study of the monotypic fish order Indostomiformes(Osteichthyes).

单型鱼目 Indostomiformes (Osteichthyes) 的系统研究。

基本信息

批准号：
12640686
负责人：
IWAMI Tetsuo
金额：
$ 0.9万
依托单位：
Tokyo Medical Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640686/
关键词：
systematics chromosome Indostomidae osteology Gasterosteiformes ヨウジウオ目

项目摘要

TAXONOMY Britz and Kottelat (1999) described two new species, Indostomus and I. crocodilus, from the South East Asia. Based on their work, the present secimens were referred to I. Corocodilus, however, some interesting specimens having different shape of caudal preduncle were also found. More detailed revised work including examinations on growth and sel differences is expected.CHOMOSOMES Based on cultured cells derived from the gill epithlium, the diploid chromosome number of I. Crocodilus is concluded as 30. Karyotype of this species is 14M/SM+16ST/A.HISTOLOGY Histological examinations provednthe kidney type of I. crocodilus as the glomerular kidney.OSTEOLOGICAL CHAACTES The premaxillary of I. crododilus is small and has no premaxillary articular process. The number of radials is 3. They are relatively large and similar in size with the scapula. No postclcithrum. All elements of the caudal skeletions are united to a single bony plate.The Indostomidae have a similar feature in osteology with the Gasterosteiformes. Based on the chromosome and histological data, however, the close relationships between the Indostomidae and the Gasterosteiformes could not be supported. The taxonomic position of the Indostomidae proposed by Nelson(1994), therefore, is supposed to be a problematical. A molecular approach and adequate morphological data of supposed relatives are indispensable for reconstructing the reliable phylogenetic relationships of the Indostomiformes.

Britz和Kottelat（1999）描述了两个来自东南亚的新种：Indostomus和I. crocodilus。根据他们的工作，目前的标本被认为是Corocodilus，但也发现了一些具有不同形状的尾前鞘的有趣标本。预计将进行更详细的修订工作，包括对生长和自我差异的检查。基于鳃上皮细胞的培养，鳄鱼二倍体染色体数目为30。核型为14M/SM+16ST/A。组织学检查证实鳄鱼肾型为肾小球肾。骨学特征：罗虎的上颌前骨很小，没有上颌前关节突。径向数是3。它们相对较大，大小与肩胛骨相似。没有postclcithrum。尾部骨骼的所有部分都连接在一块单一的骨板上。Indostomidae与gasterosteiformae在骨学上有相似的特征。然而，基于染色体和组织学资料，不能支持Indostomidae和gasterosteiformae之间的密切关系。因此，Nelson（1994）提出的Indostomidae的分类地位应该是有问题的。对于重建可靠的indostomiforma的系统发育关系，分子方法和足够的形态学数据是必不可少的。