Yes, there is no Tiger constellation in Saint Seiya.

In the Saint Seiya universe, the constellations are represented by the twelve Zodiac signs and several additional constellations that correspond to various mythological figures and creatures. These constellations are significant because they serve as the basis for the power and personalities of the Saints, who are warriors chosen to protect the world from evil.

The Tiger constellation, however, is not included in the list of constellations recognized by Saint Seiya. This is likely due to the fact that the Zodiac signs and additional constellations included in the series were chosen based on their significance in Greek mythology, as well as their connection to horoscopes and astrology.

While the Tiger is a significant animal in various cultures and mythologies, it does not have the same level of connection to astrology and the twelve Zodiac signs as the other animals included in Saint Seiya. As a result, it is not surprising that the Tiger constellation was not included in the series.

It is also worth noting that Saint Seiya is a work of fiction and, as such, the inclusion or exclusion of certain elements is up to the discretion of the creator. It is possible that the absence of the Tiger constellation was a deliberate choice made for artistic or storytelling reasons, rather than simply an oversight or lack of knowledge of the animal's significance.

Despite the absence of the Tiger constellation, Saint Seiya remains a beloved and influential work of anime and manga, known for its memorable characters, epic battles, and rich mythology.