FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term spermatocyte ID (Ontology) FBbt:00004936 (Fly Anatomy)
Definition Male germline cell that is part of the 16-cell spermatocyte cyst. It expresses twine, which regulates the meiotic cycle (Witt et al., 2019).[ FlyBase:FBrf0064778 FlyBase:FBrf0243241 ]
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes  Insertions Constructs
 spermatocyte (all annotations which use CV term, excluding "NOT" statements)
     spermatocyte | adult stage
      --       --
     spermatocyte | adult stage | increased number
      --       --       --       --
     spermatocyte | cell autonomous | somatic clone
      --       --       --       --
     spermatocyte | cell non-autonomous | somatic clone
      --       --       --       --
     spermatocyte | decreased number
      --       --
     spermatocyte | ectopic
      --       --       --       --
     spermatocyte | germline clone
      --       --       --       --
     spermatocyte | heat sensitive
      --       --
      --
     spermatocyte | increased number
      --       --       --       --
     spermatocyte | somatic clone
      --       --       --
     spermatocyte | spermatogenesis
      --       --
     spermatocyte | third instar larval stage
      --       --       --       --
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germline cell
 |__male germline cell___________
male germline cyst               |
 |__spermatocyte cyst            |
male-specific anatomical entity  |
 |__male germline cell___________|
                                 spermatocyte  920 rec.
                                 spermatocyte cyst(+) 1007 rec.
                                  |__spermatocyte  920 rec.
                                  |__primary spermatocyte 191 rec.
                                  |   |__apolar primary spermatocyte
                                  |   |__mature primary spermatocyte 7 rec.
                                  |   |__meiotic primary spermatocyte(+) 12 rec.
                                  |   |__polar primary spermatocyte 18 rec.
                                  |__secondary spermatocyte 35 rec.
                                  |   |__interphase secondary spermatocyte
                                  |   |__meiotic secondary spermatocyte(+) 2 rec.
                                  |__spermatocyte fusome 28 rec.
                                  |__Y chromosome loop 156 rec.
                                      |__primary spermatocyte 191 rec.
                                      |   |__apolar primary spermatocyte
                                      |   |__mature primary spermatocyte 7 rec.
                                      |   |__meiotic primary spermatocyte(+) 12 rec.
                                      |   |__polar primary spermatocyte 18 rec.
                                      |__secondary spermatocyte 35 rec.
                                      |   |__interphase secondary spermatocyte
                                      |   |__meiotic secondary spermatocyte(+) 2 rec.
                                      |__spermatocyte fusome 28 rec.
                                      |__Y chromosome loop 156 rec.
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Is a male germline cell
Develops from spermatogonium
Part of spermatocyte cyst
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CL:0000017