Spermatogenesis in the Non-Scrotal Bat–&lt;i&gt;Rhinopoma kinnear&lt;/i&gt;&lt;i&gt;i&lt;/i&gt; Wroughton (Microchiroptera: Mammalia)

Singwi, M.S.; Lall, Suresh B.

doi:10.1159/000145735

Cited by 21 publications

(24 citation statements)

References 18 publications

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“…In a nonscrotal microchiropteran, Rhinopoma kinneari, three types of spermatogonia were observed: a single type A, the intermediate type (In), and type B (Singwi and Lall, 1983). These three types of spermatogonia were observed in the megachiropteran Pteropus poliocephalus (McGuckin and Blackshaw, 1987) and Saidapur and Patil (1992) recognized three types of A spermatogonia (A 1 , A 2 and A 3 ), in addition to In and B types in Rousettus leschenaulti.…”

Section: Discussionmentioning

confidence: 95%

“…Although testicular histoarchitecture and seasonal changes in the germinal epithelium, the Sertoli cells and the Leydig cells have been described in some oriental and occidental species of Micro-and Mega-chiroptera, information about the kinetics of the process is still scarce (Anand Kumar, 1965;Racey and Tam, 1974;Singwi and Lall, 1983;McGuckin and Blackshaw, 1987;Saidapur and Patil, 1992;Entwistle et al, 1998;Morigaki et al, 2001;Kurohmaru et al, 2002;Lee, 2003;Sharifi et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Beguelini

Moreira

Faria

et al. 2009

Journal of Morphology

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We know little about the process of spermatogenesis in bats, a great and diverse clade of mammals that presents different reproductive strategies. In the present study, spermatogenesis in six species of Neotropical bats was investigated by light microscopy. On the basis of chromatin condensation, nuclear morphology, relative position to the basal membrane and formation of the flagellum, three types of spermatogonia were recognized: dark type A (A(d)), pale type A (A(p)), and type B; the development of spermatids was divided into seven steps. With the exception of Myotis nigricans, the seminiferous epithelium cycle of the other five species studied was similar to those of other mammals, showing gradual stages by the tubular morphology method. Asynchrony was observed in the seminiferous epithelium cycle of M. nigricans, shown by overlapping stages and undefined cycles. The frequencies found in the three phases of the cycle were variable with the greatest frequency occurring in the postmeiotic phase (>50%) and the least in the meiotic phase (<10%). The similarities observed in the five species of Phyllostomidae appeared to be related to their phylogenetic relationship and shorter divergence times, whereas the differences in M. nigricans appeared to be related to its greater phylogenetic distance because the Vespertilionidae family diverged earlier.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Beguelini

Moreira

Faria

et al. 2009

Journal of Morphology

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“…Several studies have been reported on the testes of bats [6,10,[14][15][16][17]23]. Some of them were carried out from a morphological viewpoint.…”

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confidence: 99%

“…Oh et al [16] investigated the spermiogenesis in the Japanese greater horseshoe bat by transmission electron microscopy. However, only one report is available on the cycle of the seminiferous epithelium in bats [23].…”

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confidence: 99%

Cycle of the Seminiferous Epithelium in the Java Fruit Bat (Pteropus vampyrus) and the Japanese Lesser Horseshoe Bat (Rhinolophus cornutus).

Morigaki

Kurohmaru

Kanai‐Azuma

et al. 2001

The Journal of Veterinary Medical Science

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ABSTRACT. The cycle of the seminiferous epithelium in the Java fruit bat, Pteropus vampyrus, and the Japanese lesser horseshoe bat, Rhinolophus cornutus, was investigated by light microscopy and the characteristics of spermiogenesis were compared between these two species. In the Java fruit bat, the cycle of the seminiferous epithelium was divided into 11 stages and developing spermatids were subdivided into 13 steps. While in the Japanese lesser horseshoe bat, the cycle of the seminiferous epithelium was divided into 10 stages and developing spermatids were subdivided into 13 steps. Excepting slight morphological differences, the characteristics of acrosomal formation in both species were almost similar with each other. In the Java fruit bat after stage VII, the acrosome gradually elongated, flattened and finally became scoop-like in shape. In the Japanese lesser horseshoe bat after stage VIII, the acrosome elongated, flattened and then slightly shortened. Before spermiation, the acrosome became long spatula-like in shape. The elongation and flattening of spermatids in these two species were similar to those in insectivores. The finding may reflect the fact that the order Chiroptera is phylogenetically close to the order Insectivora. KEY WORDS: acrosome, cycle of seminiferous epithelium, Japanese lesser horseshoe bat, Java fruit bat, spermiogenesis.

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“…The spermatid differentiation occurred in four phases: the Golgi phase, the cap phase, the acrosomal phase, and the maturation phase (Gunawardana & Scott 1977, Singwi & Lall 1983, Lin & Jones 1993, Gó es & Dolder 2002, Segatelli et al 2002. Chromatoid bodies observed in spermatids have been reported in guinea pigs, other mammals, birds, and reptiles.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructure of spermatogenesis in Spix's yellow-toothed cavy (Galea spixii)

et al. 2014

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This was a pioneer study of the spermatogenic process from the onset of puberty in Spix's yellow-toothed cavies (SYC, Galea spixii) bred in captivity. The study aimed to characterize fine structure of spermatogenesis. Twelve testes from pubertal and post-pubertal SYC males were studied using transmission electron microscopy. Spermatogenesis can be divided into three phases: proliferation, meiosis, and spermiogenesis. In proliferation phase, three types of spermatogonia were identified and characterized as A dark , A pale , and B. In the second phase, spermatocytes (2n) undergo meiotic divisions that generate spermatids (n); the process begins in spermatocytes in the preleptotene stage when they increase their nuclear size, differentiating into spermatocytes in the leptotene stage when cell division is initiated. In addition, we found chromatin condensation, and formation of a structure composed of proteins that formed a central shaft and two lateral bars associated with pairing of homologous chromosomes. During spermiogenesis, the following main events occurred: condensation of nuclear chromatin, formation of acrosome with perfuratorium, elimination of residual cytoplasm, and development of the flagellum. The sperm head is different from that of other rodents. The endoplasmic reticulum and the Golgi complex are the two main organelles demonstrated during this process. These organelles collaborate through synthesis of proteins and hormones for the development of germ cells during spermatogenesis in SYC.

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Spermatogenesis in the Non-Scrotal Bat–<i>Rhinopoma kinnear</i><i>i</i> Wroughton (Microchiroptera: Mammalia)

Cited by 21 publications

References 18 publications

Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Morphological characterization of the testicular cells and seminiferous epithelium cycle in six species of Neotropical bats

Cycle of the Seminiferous Epithelium in the Java Fruit Bat (Pteropus vampyrus) and the Japanese Lesser Horseshoe Bat (Rhinolophus cornutus).

Ultrastructure of spermatogenesis in Spix's yellow-toothed cavy (Galea spixii)

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