OBSERVATIONS ON THE GENITAL SEGMENTS OF SPIRORBIS (POLYCHAETA)

1. In all species of Spirorbis examined, the first two or three abdominal segments of mature adults are female and the remaining abdominal segments are male. Both female and male gametes differentiate simultaneously in the same individual and arise from a discrete and persistent gonad composed of primordial germ cells arranged in two retroperitoneal rows, mesial to the ventral nerve cords, and running the length of the abdominal segments.2. Cytological events associated with the development of female and male gametes are described. Differentiation of oocytes and spermatocytes occurs freely within the coelomic cavity without the aid of attached nurse cells.3. Although coelomostome rudiments are present in both female and male segments, functional genital ducts do not develop. Spawning is assumed to take place by rupture of the body wall.

• Publication year

  1967

• Venue

  The Biological Bulletin

• Publication date

  1967-02-01

• Fields of study

  Biology

• Identifiers
  DOI 10.2307/1539880
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• Although coelomostome rudiments are present, functional genital ducts do not develop and spawning is inferred to occur by rupture of the body wall.

  Confidence 0.89

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• Oocytes and spermatocytes differentiate freely within the coelomic cavity without attached nurse cells.

  Confidence 0.91

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• Female and male gametes differentiate simultaneously within the same individual from a discrete, persistent gonad made of primordial germ cells arranged in two retroperitoneal rows along the abdominal segments.

  Confidence 0.95

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• In mature Spirorbis adults, the first two or three abdominal segments are female and the remaining abdominal segments are male.

  Confidence 0.97

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review

• abdominal segments

  anatomical structure

  The posterior body segments whose sex-specific differentiation is described in mature adults.

  Aliases: abdomen segments

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• coelomic cavity

  anatomical structure

  The internal body cavity where gamete differentiation is observed to occur.

  Aliases: coelom

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• genital ducts

  anatomical structure

  The reproductive ducts expected to conduct gametes outward from the body cavity.

  Aliases: ducts

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• gonad

  anatomical structure

  The persistent reproductive tissue in the abdominal region that contains the germ cells.

  Aliases: reproductive gonad

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• primordial germ cells

  cell type

  The germline precursor cells that form the discrete gonadal rows in the abdominal segments.

  Aliases: PGCs

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review
• spirorbis

  organism group

  A genus of spirorbid polychaete worms examined for the organization of their genital segments.

  Aliases: spirorbid worms

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewimjlk (vdp8mqzes2) reviewAK (4715169a40) review

• No references are available for this paper.

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