Symmetry in biology Most radially symmetric animals are symmetrical about an axis extending from the center of the oral surface, which contains the mouth to the center of the opposite, , end. Radial symmetry is especially suitable for sessile animals such as the sea anemone, floating animals such as jellyfish, and slow moving organisms such as starfish. Animals in the phyla Cnidaria and Echinodermata are radially symmetric, although many sea anemones and some corals have bilateral symmetry defined by a single structure, the siphonoglyph. Many flowers are radially symmetric or actinomorphic. Roughly identical flower parts – petals, sepals, and stamens – occur at
Bacterial phyla Despite these lineages not being officially recognised (due to the ever-increasing number of sequences belonging to undescribed phyla) the ARB-Silva database lists 67 phyla, including 37 candidate phyla (Acetothermia, Aerophobetes, Aminicenantes, aquifer1, aquifer2, Atribacteria, Calescamantes, CKC4, Cloacimonetes, GAL08, GOUTA4, Gracilibacteria, Fermentibacteria (Hyd24-12), Hydrogenedentes, JL-ETNP-Z39, Kazan-3B-09, Latescibacteria, LCP-89, LD1-PA38, Marinimicrobia, Microgenomates, OC31, Omnitrophica, Parcubacteria, PAUC34f, RsaHF231, S2R-29, Saccharibacteria, SBYG-2791, SHA-109, SM2F11, SR1, TA06, TM6, WCHB1-60, WD272, and WS6), the Ribosomal Database Project 10, lists 49 phyla, including 20 candidate phyla (Acetothermia, Aminicenantes, Atribacteria, BRC1, Calescamantes, Cloacimonetes, Hydrogenedentes, Ignavibacteriae, Latescibacteria, Marinimicrobia, Microgenomates, Nitrospinae, Omnitrophica, Parcubacteria, Poribacteria, SR1, Saccharibacteria, WPS-1, WPS-2, and ZB3),