Abstract：
:To add to our understanding of dendrocoelid spermatozoa and to describe additional phylogenetic characters, the ultrastructure of the testis was investigated in the subterranean freshwater planarian Dendrocoelum constrictum. This is the first study investigating spermatogenesis and spermatozoon ultrastructure in a subterranean freshwater planarian species. We found that the basic structure of spermatozoa in D. constrictum is similar to that of other Tricladida that have been studied previously. In fact, D. constrictum spermatozoa possess an elongated nucleus, one giant mitochondrion, and two subterminal flagella with a 9+'1' pattern. The flagella emerge together from one side of the spermatozoon. However, D. constrictum has some characteristics that have not yet been described for other freshwater planarians. In fact, the number of cortical microtubules reaches the maximum number in the anterior and middle part of region I, and then decrease until they disappear towards the posterior extremity of the spermatozoon. The extreme tip of the anterior region of the spermatozoon exhibits a specific external ornamentation of the plasma membrane.
journal_name
C R Bioljournal_title
Comptes rendus biologiesauthors
Harrath AH,Gammoudi M,Mansour L,Ahmed M,Sirotkin AV,Al Omar SY,Ibrahim KE,Alwasel SHdoi
10.1016/j.crvi.2014.07.004subject
Has Abstractpub_date
2014-09-01 00:00:00pages
513-20issue
9eissn
1631-0691issn
1768-3238pii
S1631-0691(14)00163-2journal_volume
337pub_type
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