a conclusion supported by molecular genetic data. during s-phase of the nuclear cycle the chromosomes do uncoil to facilitate dna synthesis, and the volumes of both the chromosomes and the nucleus return to those seen in the g22 phase. other cytoplasmic organelles there are several additional organelles found in the cytoplasm of symbiodinium. the most obvious of these is the structure referred to as the "accumulation body". this is a membrane-bound vesicle (vacuole) with contents that are unrecognizable, but appear red or yellow under the light microscope. it may serve to accumulate cellular debris or act as an autophagic vacuole in which non-functional organelles are digested and their components recycled. during mitosis, only one daughter cell appears to acquire this structure. there are other vacuoles that may contain membranous inclusions, while still others contain crystalline material variously interpreted as oxalate crystals or crystalline uric acid. species symbiodinium kawagutii the following species are recognised by the world register of marine species: symbiodinium bermudense r.k.trench, 1993 symbiodinium californium a.t.banaszak, r.iglesias-prieto & r.k.trench, 1993 symbiodinium cariborum r.k.trench, 1993 symbiodinium corculorum r.k.trench, 1993 symbiodinium glynnii d.c.wham, g.ning, t.c.lajeunesse, 2017 symbiodinium goreaui trench & blank, 2000 symbiodinium kawagutii trench & blank, 2000 symbiodinium meandrinae r.k.trench, 1993 symbiodinium microadriaticum freudenthal, 1962 symbiodinium minutum t.c.lajeunesse, j.e. parkinson & j.d.reimer, 2012 symbiodinium pilosum trench & blank, 2000 symbiodinium psygmophilum lajeunesse, t.c., parkinson, j.e. & reimer, j.d., 2012 symbiodinium pulchrorum r.k.trench, 1993 symbiodinium thermophilum, new species