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Histology and ultrastructure of male reproductive system of the Indian Spiny lobster Panulirus homarus (Decapoda: Palinuridae)

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Relation http://eprints.cmfri.org.in/9981/
 
Title Histology and ultrastructure of male reproductive system
of the Indian Spiny lobster Panulirus homarus (Decapoda: Palinuridae)
 
Creator Pillai, S Lakshmi
Nasser, M
Sanil, N K
 
Subject Lobsters
 
Description The spiny lobster Panulirus homarus, distributed along the Southeast and Southwest coasts of India,
is an important commercial species having mariculture potential. Despite its importance, the structural and
ultrastructure features of male gonads from this species have received scarce attention. Hence this study was
aimed to describe the male reproductive tract of the species, using standard histological and electron microscopy
techniques. Gonads from 94 specimens of P. homarus ranging in carapace length 37mm-92mm from
vizhinjam (Southwest coast of India.) were obtained and processed for the study (Histology-70 numbers &
ultrastructure-24 numbers). The male reproductive system consists of paired testis and vas deferens located in
the cephalo-thoracic region. Macroscopically, the reproductive tract was observed in lobsters >35mm carapace
length. In immature testis, spermatogonia were seen which measured 6.9-13.8µm in diameter and in the mature
testis primary (5.4-5.9µm) and secondary spermatocytes (2.8-3µm) and spermatids (2.2-2.4µm) were present.
Each vas deferens consists of proximal and distal portions. The spermatophoric mass begins formation in
the proximal vas deferens. In the distal vas deferens the spermatophoric mass containing the spermatozoa are
arranged in packets towards the periphery by the gelatinous matrix produced by the typhlosole. Ultrastructurally,
the spermatogonia have lamina, nucleus and mitochondria like bodies, the primary spermatocytes have nucleus,
dense chromatin and vacuolated cytoplasm and the spermatids have mitochondria, endoplasmic reticulum and
centrioles. The endoplasmic reticulum and the nuclear envelope in the spermatids form the acrosome. The radial
arms with microtubules are formed in association with the dense endoplasmic reticulum, near the nucleus. The
sperm has a spherical structure with the nucleus, lamellar region, spikes and acrosome. This is the first comprehensive
report of the structure of the male gametes and spermatogenesis in P. homarus from Indian waters.
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/9981/1/Lakshmi_Pillai_Lobster.pdf
Pillai, S Lakshmi and Nasser, M and Sanil, N K (2014) Histology and ultrastructure of male reproductive system of the Indian Spiny lobster Panulirus homarus (Decapoda: Palinuridae). International Journal of Tropical Biology and Conservation / Revista de Biologia Tropical, 62 (2). pp. 533-541.