Spermatozoa and spermiogenesis in the monocotylid Heterocotyle capricornensis (Platyhelminthes, Monogenea, Monopisthocotylea), including observations of aberrant folding and fusing of spermatozoa in one individual

Title:

Spermatozoa and spermiogenesis in the monocotylid Heterocotyle capricornensis (Platyhelminthes, Monogenea, Monopisthocotylea), including observations of aberrant folding and fusing of spermatozoa in one individual

Creator:

Watson, Nikki A. and Chisholm, Leslie A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b0b48e95-9fdd-4955-aaed-2c6236392114
uuid:b0b48e95-9fdd-4955-aaed-2c6236392114
urnnbn:urn:nbn:cz:aba007-000dpo

Subject:

flatworm, phytogeny, monogcncan, monoeolylid, plathelminth, sperm, and spermiogenesis

Type:

model:internalpart and TEXT

Format:

print

Description:

Spermatozoa of the monogenean Heterocotyle capricornensis Chisholm et Whittington, 1996 are long and filiform, comprising an elongate nucelus, probably a single elongate mitochondrion and two incorporated axonemes, one of which is shifted with respect to the other. The shift results in a region at each end of the sperm where only one axoncmc is present, accompanied by the nucleus and mitochondrion at one end and the nucleus and/or mitochondrion at the other. By taking note of the direction of dyncin arms on the axonemal doublet microtubules, each axoneme is identified and followed from beginning to end. No basal bodies remain in mature sperm but the main nuclear end is interpreted as proximal/anterior based on the final stages of spermiogenesis. A group of four or five cortical microtubules from the spermatid zone of differentiation persists in mature sperm, but is not closely associated with a region of extracellular matrix, as it is in other monocotylids. The sperm structure is compared with that of other monocotylids and the phylogenetic implications are discussed. Aberrant sperms in one individual were folded and fused along much of their length.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

211-220 and 37-46

Source:

Folia parasitologica | 1998 Volume:45 | Number:3

Harvested from:

CDK

Metadata only:

false