What type of galaxy is characterized by having both spiral and elliptical features?

A lenticular galaxy is characterized by features that exhibit both spiral and elliptical characteristics. These galaxies possess a central bulge and a disk structure like spiral galaxies, but they lack the prominent spiral arms. Instead, they typically show a smooth and featureless disk, which is reminiscent of elliptical structures.

Lenticular galaxies often form when spiral galaxies lose their gas and dust and stop forming new stars, leading to an intermediate form between spiral and elliptical galaxies. This unique combination of features allows lenticular galaxies to be classified distinctly based on their morphology and evolutionary status in the context of galaxy formation.

Other types of galaxies mentioned, such as irregular or barred spiral galaxies, do not fulfill the specific structural criteria that define the lenticular type. Irregular galaxies lack a defined shape and can contain a blend of features but do not exhibit the smooth characteristics of lenticular galaxies. Similarly, barred spiral galaxies specifically display a central bar feature with spiral arms, setting them apart from the more elliptical nature of lenticular galaxies.