overlaps embryonic/larval hemocyte larva larval sessile hemocyte fly_anatomy.ontology FBbt:00005496 sessile haemocyte The 2 denser areas of sessile hemocytes at abdominal segments A and A9 have been referred to as posterior hematopoietic tissue (PHT) (Kurucz et al., 2007). A hemocyte that is not freely circulating, but is attached to the inner surface of the integument or attached to the imaginal discs. Sessile hemocyte islets are segmentally distributed and often located near crystal cells or along the posterior region of the dorsal vessel, concentrated in 2 denser organ-like clusters. These islets contain plasmatocytes, crystal cells and lamellocyte precursors. sessile hemocyte