Lamins are components of the nuclear lamina, a fibrous layer on the nucleoplasmic side of the inner nuclear membrane, which is thought to provide a framework for the nuclear envelope and may also interact with chromatin (PubMed:3126192, PubMed:15035436). May have a role in the localization of the LEM domain proteins Ote, bocks and MAN1 to the nuclear membrane (PubMed:15035436, PubMed:16439308). In spermatocytes, plays a role in maintaining type-A lamin LamC nuclear localization; regulates meiotic cytokinesis by maintaining the structure of the spindle envelope, and by contributing to the formation of the contractile ring and central spindle (PubMed:27402967). Required for nuclear migration and to link the microtubule organizing center (MTOC) to the nucleus (PubMed:14617811). In addition, is required for nuclear envelope localization of klar (PubMed:14617811). Interacts directly with LBR (PubMed:15054108). Interacts with MAN1 (PubMed:16439308). Interacts with Ote (PubMed:9632815, PubMed:22751930). Nuclear periphery (PubMed:7593280). At metaphase and anaphase, weakly expressed in the nuclear envelope and spindle poles (PubMed:16439308). Expression in oocyte cytoplasm increases after stages 6 to 7 of egg development (PubMed:9199347). In spermatocytes detected at the spindle envelope, spindle poles and astral membrane throughout meiosis I, whereas mostly depleted in meiosis II (PubMed:27402967). Colocalizes with nuclear pore complex component Nup107 throughout meiosis I (PubMed:27402967). Constitutively expressed in all tissues (at protein level) (PubMed:7593280). Expressed in spermatocytes (at protein level) (PubMed:27402967). Constitutively expressed in all developmental stages, especially during the first 6-9 hours. Three forms of lamin have been identified in D.melanogaster, lamin Dm0 is rapidly processed to lamin Dm1 in the cytoplasm, Dm1 is then assembled in the nuclear envelope and is then phosphorylated, forming lamin Dm2. RNAi-mediated knockdown in spermatocytes results in spindle envelope disintegration, failure to form contractile rings and central spindle microtubules during meiosis I resulting in abnormal cytokinesis and multinuclear cell formation. Belongs to the intermediate filament family.