Ultrastructure of spermiogenesis and spermatozoa of Decadidymus gulosus, Temnocephala dendyi, T. minor, Craspedella sp., Craspedella spenceri and Diceratocephala boschmai (Platyhelminthes, Temnocephalida, Temnocephalidae), with emphasis on the intercentri

Watson, Nikki A., Rohde, Klaus and Sewell, Kim B. (1995) Ultrastructure of spermiogenesis and spermatozoa of Decadidymus gulosus, Temnocephala dendyi, T. minor, Craspedella sp., Craspedella spenceri and Diceratocephala boschmai (Platyhelminthes, Temnocephalida, Temnocephalidae), with emphasis on the intercentri. Invertebrate Reproduction and Development, 27 2: 131-143.

Author Watson, Nikki A.
Rohde, Klaus
Sewell, Kim B.
Title Ultrastructure of spermiogenesis and spermatozoa of Decadidymus gulosus, Temnocephala dendyi, T. minor, Craspedella sp., Craspedella spenceri and Diceratocephala boschmai (Platyhelminthes, Temnocephalida, Temnocephalidae), with emphasis on the intercentri
Formatted title
Ultrastructure of spermiogenesis and spermatozoa of Decadidymus gulosus, Temnocephala dendyi, T. minor, Craspedella sp., Craspedella spenceri and Diceratocephala boschmai (Platyhelminthes, Temnocephalida, Temnocephalidae), with emphasis on the intercentriolar body and zone of differentiation
Journal name Invertebrate Reproduction and Development
ISSN 0792-4259
0168-8170
Publication date 1995-01-01
Sub-type Article (original research)
Volume 27
Issue 2
Start page 131
End page 143
Total pages 13
Place of publication Abingdon, Oxfordshire, United Kingdom
Publisher Taylor & Francis
Language eng
Formatted abstract
Examination of the ultrastructure of spermiogenesis and mature sperm in six species of Temnocephalidae revealed the origin of the spiral region of microtubules in the sperm shaft. The region is characteristic of many Temnocephalida but absent from other platyhelminth taxa. During spermiogenesis, an electron-dense heel region develops from, or adjacent to, the outer plates of the intercentriolar body in the zone of differentiation. The intercentriolar body splits into two halves, each of which remains attached to one basal body via the dense heel. The entire anchoring apparatus of each flagellum, consisting of the basal body, striated rootlet and the intercentriolar body and dense heel, rotates around the spermatid shaft until the two basal bodies lie parallel to each other. This rotation causes the compression of one of the two semi-circular rows of microtubules which originate on opposite sides of the spermatid shaft. The row is compressed to a tight horseshoe shape with electron-dense material between the folded halves. Distal to the flagellar insertion region, the shaft tapers and the number of microtubules decreases. Proximally the inner folded row gradually opens to join the remaining semicircle of microtubules by one end joining the outer array first. The other end remains inside the peripheral row for some distance, resulting in a spiral arrangement along part of the shaft. In the six species examined, the proximal end of the sperm terminated either in an extensive flange that contained only microtubules or by the shaft splitting into a number of fine processes, each containing only one or a few microtubules.

Keyword Spermiogenesis
Spermatozoa
Ultrastructure
Temnocephalida
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Microscopy and Microanalysis Publications
 
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Created: Thu, 22 Jan 2015, 18:19:29 EST by Kim Sewell on behalf of Centre for Microscopy and Microanalysis