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ISSN: 2320-964X (Online) 

ISSN: 2320-7817  (Print)



Dr. Santosh Pawar 




Int. Journal of Life Sciences, 2018; 6(2): 386-393       |                 Available online, April 25, 2018

Comparative ultrastructure study on the sperm morphology of two grapsid crabs

Thanamalini R1, Shyla Suganthi A1* and Ganapiriya V2


1Department of Zoology, Holy Cross College (Autonomous), Nagercoil, Tamil Nadu, India – 629004

2Department of Zoology, Khadir Mohideen College, Adiramapattinam, Tanjore, Tamil Nadu, India -614 701

*corresponding Author: Shyla Suganthi A, E mail


Received : 26.10.2017     |     Accepted : 10.03.2018     |      Published : 25.04.2018

The study envisaged the spermatozoon morphology of two grapsid crabs, Grapsus albolineatus and G. tenuicrustatus (Family: Grapsidea) via, electron microscope. The marked spermatozoa similarities between these two species appear to indicate a close phylogenetic proximity with the  Grapsidae  family.  With few variations such as the absence of acrosome ray zone and thickened ring in the posterior acrosome, the spermatozoa of these two crabs display the features of thoracotreme  synapomorphy. The distinct variations between these two species are the presence of onion ring in the peripheral outer acrosome layer of G. tenuicrustatus, and capsular flange in G.  albolineatus.  Apart from the other thoracotreme characters, the spermatozoa of these two crabs possess a protective outer sheath with striking differences. 


Key words: Spermatozoa, crustaceans, brachyurans, Grapsus albolineatus, Grapsus tenuicrustatus.



Editor: Dr.Arvind Chavhan


Cite this article as:

Thanamalini R, Shyla Suganthi A and Ganapiriya V (2018) Comparative ultrastructure study on the sperm morphology of two grapsid crabs, Int. J. of. Life Sciences, Volume 6(2): 386-393. 



Fund received from UGC Minor project [No: F. MRP-3929/11 (MRP/UGC-SERO) Link No: 3929] is gratefully acknowledged. We thank Mrs. Rita, Electron Microscopic Unit, Christian College, Vellore, Tamil Nadu for permitting to make used TEM facility.


Conflicts of interest: The authors stated that no conflicts of interest.



Copyright: © 2018 | Author(s), This is an open access article under the terms of the Creative Commons Attribution-Non-Commercial - No Derives License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.


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