FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term sensillum of sacculus chamber I ID (Ontology) FBbt:00004184 (Fly Anatomy)
Definition Sensillum of chamber I of the sacculus of the antenna (Shanbhag et al., 1995). It is devoid of pores, has no socket at the base and gradually tapers at the distal end, which has an irregularly-sculpted surface (Shanbhag et al., 1995). It houses the sensory dendrites of two hygrosensory neurons, expressing Ir40a and Ir68a (Shanbhag et al., 1995; Marin et al., 2020). Some of these sensilla additionally house one thermosensory neuron, expressing Ir21a (Shanbhag et al., 1995; Marin et al., 2020).[ FlyBase:FBrf0084361 FlyBase:FBrf0246456 ]
Also Known As"basiconic sensillum of sacculus" ; "no-pore basiconic sensillum" ; "no-pore sensilla basiconica" (for all, see Synonyms field below)
CommentClassed as basiconic by Shanbhag et al. (1995), but lacks characteristic rows of pores to match description in Shanbhag et al. (1999) - FBrf0128642 and Gonzales et al. (2021) - FBrf0250923.
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VFB:FBbt_00004184
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 sensillum of sacculus chamber I (all annotations which use CV term, excluding "NOT" statements)
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antennal segment 3 sense organ
 |__chamber I of sacculus_________
 |__sensillum of sacculus_________|
sacculus                          |
 |__chamber I of sacculus_________|
 |__sensillum of sacculus_________|
sense organ                       |
 |__hygrosensitive sensory organ__|
external compound sense organ     |
 |__chamber I of sacculus_________|
adult antennal sensillum          |
 |__sensillum of sacculus_________|
hygrosensory system               |
 |__hygrosensitive sensory organ__|
                                  sensillum of sacculus chamber I  3 rec.
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Is a hygrosensitive sensory organ
sensillum of sacculus
Part of chamber I of sacculus
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Synonyms
  • "basiconic sensillum of sacculus" EXACT
    "no-pore basiconic sensillum" EXACT
    "no-pore sensilla basiconica" EXACT[ FlyBase:FBrf0084361 ]
    "no-pore sensillum of sacculus" BROAD
    "np-SB" EXACT[ FlyBase:FBrf0084361 ]
Secondary IDs
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VFB:FBbt_00004184