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Sperm ultrastructure in Myxinidocotyle and Acanthocotyle (Platyhelminthes, Monogenea, Acanthocotylidae)
Author(s) -
MALMBERG GÖRAN,
AFZELIUS BJÖRN A.
Publication year - 1990
Publication title -
zoologica scripta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 64
eISSN - 1463-6409
pISSN - 0300-3256
DOI - 10.1111/j.1463-6409.1990.tb00245.x
Subject(s) - monogenea , biology , ultrastructure , flatworm , turbellaria , sperm , anatomy , hagfish , zoology , fish <actinopterygii> , gill , fishery , vertebrate , biochemistry , botany , gene
Spermatozoa of Myxinidocotyle californica from the hagfish Eptatretus stoutii and of Acanthocotyle lobianchi from the skate Raja clavata show a similar ultrastructure: two axoncmes of the 9 + 1 type in parallel with the nucleus‐and one mitochondrion. In the released Acanthocotyle spermatozoa nucleus and mitochondrion both have a triangular cross‐section. No cortical microtubules are present. The ultrastructure of these two acanthocotylid spermatozoa thus corresponds to sperm pattern 2 according to Justine et al. (1985). This pattern is derived from the more primitive pattern 1, which in the Monogenea is found only in the Oligonchoinea Bychowsky, 1937 or the Polyopisthocotylea sensu Justine et al.