The ultrastructure of the male gonad of Eulimnadia texana (Branchiopoda, Spinicaudata) has been observed for the first time to investigate the sexuality of a well-studied case of androdioecy in the animal kingdom. The male gonad is a double structure located in the hemocoel throughout the entire body length on each side of the midgut. Male gametes originate from the wall and mature centripetally toward the lumen; the proliferative activity is very high and continuous and therefore the mature gonad is full of numerous germ cells. Inside the lumen several degenerative stages are found mixed with sperm cells and spermatids, the latter two being not easily distinguishable because of the slight differences between them. The evolutionary meaning of the degenerative process in E. texana male gametes is difficult to explain, and we propose some hypotheses about its possible role or cause in the studied population: (a) to help build spermatophores, (b) to act as a trophic component for viable sperm, (c) as a manifestation of inbreeding depression, and/or (d) to regulate the number of sperm cells. © 2006, The American Microscopical Society, Inc.

Ultrastructure of the male gonad and male gametogenesis in the clam shrimp Eulimnadia texana (Crustacea, Branchiopoda, Spinicaudata) / Scanabissi, F.; Cesari, M.; Reed, S. K.; Weeks, S. C.. - In: INVERTEBRATE BIOLOGY. - ISSN 1077-8306. - 125:2(2006), pp. 117-124. [10.1111/j.1744-7410.2006.00046.x]

Ultrastructure of the male gonad and male gametogenesis in the clam shrimp Eulimnadia texana (Crustacea, Branchiopoda, Spinicaudata)

Cesari M.;
2006

Abstract

The ultrastructure of the male gonad of Eulimnadia texana (Branchiopoda, Spinicaudata) has been observed for the first time to investigate the sexuality of a well-studied case of androdioecy in the animal kingdom. The male gonad is a double structure located in the hemocoel throughout the entire body length on each side of the midgut. Male gametes originate from the wall and mature centripetally toward the lumen; the proliferative activity is very high and continuous and therefore the mature gonad is full of numerous germ cells. Inside the lumen several degenerative stages are found mixed with sperm cells and spermatids, the latter two being not easily distinguishable because of the slight differences between them. The evolutionary meaning of the degenerative process in E. texana male gametes is difficult to explain, and we propose some hypotheses about its possible role or cause in the studied population: (a) to help build spermatophores, (b) to act as a trophic component for viable sperm, (c) as a manifestation of inbreeding depression, and/or (d) to regulate the number of sperm cells. © 2006, The American Microscopical Society, Inc.
2006
125
2
117
124
Ultrastructure of the male gonad and male gametogenesis in the clam shrimp Eulimnadia texana (Crustacea, Branchiopoda, Spinicaudata) / Scanabissi, F.; Cesari, M.; Reed, S. K.; Weeks, S. C.. - In: INVERTEBRATE BIOLOGY. - ISSN 1077-8306. - 125:2(2006), pp. 117-124. [10.1111/j.1744-7410.2006.00046.x]
Scanabissi, F.; Cesari, M.; Reed, S. K.; Weeks, S. C.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1249770
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 10
social impact