Paramyosin is a major structural component of many thick filaments isolated from invertebrate muscles. Heterodimer of two isoforms. Thick filaments of the myofibrils. Additional isoforms seem to exist. Isoforms can also be produced by post-translational modifications. Expressed in all larval and adult muscle tissues. Expression is five times higher in tubular than in fibrillar muscles. Undetectable during gastrulation and early phases of germ band formation. Increases during organogenesis, around 10 hours post-fertilization (hpf), to the adult stage. The more-acidic and less-abundant isoform is phosphorylated. Belongs to the paramyosin family. Truncated C-terminus.