What is the fine-grained topic of the following text: Choi, D. H., Jang, G. I., Lapidus, A., Copeland, A., Reddy, T. B. K., Mukherjee, S., Huntemann, M., Varghese, N., Ivanova, N., Pillay, M., Tindall, B. J., Goker, M., Woyke, T., Klenk, H. P., Kyrpides, N. C., Cho, B. C.
The genus Marinobacterium belongs to the family Alteromonadaceae within the class Gammaproteobacteria and was reported in 1997. Only return the topic.
The genus Marinobacterium within the class Gammaproteobacteria.