Reproductive biology of the unique mudskipper Periophthalmodon septemradiatus living from estuary to upstream of the Hau River
This study provided new knowledge on reproductive traits of the unique mudskipperPeriophthalmodon septemradiatus that is also a potential aquarium pet. Fish specimens were obtained by using fishing rods at the muddy flat in tributaries of the Hau River from August 2017 to July 2018. Data analysis of a collection of 1,504 individuals (930 males and 674 females) showed that the sex ratio of this species was significantly different from the ratio 1:1. As mature gonads were found monthly during the study period, it is suggested thatP. septemradiatus is an iteroparous species releasing eggs for a year ‐round cycle. The fish...
Source: Acta Zoologica - November 16, 2018 Category: Zoology Authors: Quang Minh Dinh,
Lam Thanh Tran,
Nhu Chon Ngo,
Tram Bich Pham,
Tien Thi Kieu Nguyen Tags: ORIGINAL ARTICLE Source Type: research
First demonstration of the neuroepithelial cells and their chemical code in the accessory respiratory organ and the gill of the sharptooth catfish, Clarias gariepinus: A preliminary study
AbstractAvailable studies that have examined O2 sensing in fish have indicated that oxygen ‐sensitive neuroepithelial cells (NECs) are O2 sensors in the gills and initiate cardiorespiratory reflexes in aquatic vertebrates. This is the first study describing the occurrence of NECs in accessory respiratory organs in the air ‐breathing catfishClarias gariepinus. Immunocytochemical stainings with specific neuronal markers such as nNOS, VAchT, 5 ‐HT and TH have been shown to be very useful for location and distribution of these cells in the gill fans and suprabranchial chamber that take origin from the transformation of t...
Source: Acta Zoologica - November 11, 2018 Category: Zoology Authors: Giacomo Zaccone,
John Maina,
Antonino German à,
Giuseppe Montalbano,
Gioele Capillo,
Luisa Aragona,
Michał J. Kuciel,
Eugenia Rita Lauriano,
José M. Icardo Tags: ORIGINAL ARTICLE Source Type: research
Why the term “larva” is ambiguous, or what makes a larva?
AbstractThe term “larva” is used for many different metazoans. Although this implies a uniform meaning, the term has in fact been used to address immatures with very different characteristics. For providing more precise reference how the term larva is applied in a specific context, I outline here different crite ria that have been used to identify an immature as a larva. These include larvae that (a) differ morphologically from their adult (morpho‐larva s. l.); (b) differ morphologically from their adult and additionally possess structures that become reduced during ontogeny (morpho‐larva s. str.); (c) have a diffe...
Source: Acta Zoologica - November 8, 2018 Category: Zoology Authors: Joachim T. Haug Tags: ORIGINAL ARTICLE Source Type: research
Microvascular anatomy of testes in the adult pipid frog, Xenopus laevis Daudin: A scanning electron microscopic study of vascular corrosion casts
AbstractThe three ‐dimensional microvascular anatomy of the testes of adultXenopus laevis was studied by scanning electron microscopy of vascular corrosion casts. Results showed that testicular arteries branch off from urogenital arteries and approach the testes via the mesorchium. At the dorsal surface of testes, arteries course towards the medial and lateral surfaces of the ovoid testes, pierce the tunica albuginea and run in the subalbugineal space and then penetrate the testicular parenchyma. In the parenchyma, they branch in all directions. At sites where larger branches arise, sphincters are present. Intimal cushio...
Source: Acta Zoologica - November 6, 2018 Category: Zoology Authors: Alois Lametschwandtner,
Bernd Minnich Tags: ORIGINAL ARTICLE Source Type: research
Ultrastructure of the spermatozoa of three species of Anomalodesmata (Mollusca, Bivalvia) and phylogenetic implications
AbstractAnomalodesmata is the rarest and most specialized group of the class Bivalvia. In general, scarce data on sperm ultrastructure of anomalodesmatans are available in the literature. Aiming to contribute to an understanding of spermatozoon morphology in this group, the present study describes the ultrastructure of male gametes of three species —Cardiomya cleryana (Orbigny 1842) (Cuspidariidae),Pandora brevirostris G üller and Zelaya 2016 (Pandoridae) andThracia similis Couthouy 1839 (Thraciidae).C. cleryana has an acrosome located at the anterior region, and the mitochondria are symmetrically arranged, while the ...
Source: Acta Zoologica - November 6, 2018 Category: Zoology Authors: Ariane Campos,
Gisele Orlandi Intro íni,
Lenita de Freitas Tallarico,
Flávio Dias Passos,
Fabrizio Marcondes Machado,
Shirlei Maria Recco‐Pimentel Tags: ORIGINAL ARTICLE Source Type: research
Microvascular anatomy of testes in the adult pipid frog, Xenopus laevis Daudin: A scanning electron microscopic study of vascular corrosion casts
AbstractThe three ‐dimensional microvascular anatomy of the testes of adultXenopus laevis was studied by scanning electron microscopy of vascular corrosion casts. Results showed that testicular arteries branch off from urogenital arteries and approach the testes via the mesorchium. At the dorsal surface of testes, arteries course towards the medial and lateral surfaces of the ovoid testes, pierce the tunica albuginea and run in the subalbugineal space and then penetrate the testicular parenchyma. In the parenchyma, they branch in all directions. At sites where larger branches arise, sphincters are present. Intimal cushio...
Source: Acta Zoologica - November 6, 2018 Category: Zoology Authors: Alois Lametschwandtner,
Bernd Minnich Tags: ORIGINAL ARTICLE Source Type: research
Ultrastructure of the spermatozoa of three species of Anomalodesmata (Mollusca, Bivalvia) and phylogenetic implications
AbstractAnomalodesmata is the rarest and most specialized group of the class Bivalvia. In general, scarce data on sperm ultrastructure of anomalodesmatans are available in the literature. Aiming to contribute to an understanding of spermatozoon morphology in this group, the present study describes the ultrastructure of male gametes of three species —Cardiomya cleryana (Orbigny 1842) (Cuspidariidae),Pandora brevirostris G üller and Zelaya 2016 (Pandoridae) andThracia similis Couthouy 1839 (Thraciidae).C. cleryana has an acrosome located at the anterior region, and the mitochondria are symmetrically arranged, while the ...
Source: Acta Zoologica - November 6, 2018 Category: Zoology Authors: Ariane Campos,
Gisele Orlandi Intro íni,
Lenita de Freitas Tallarico,
Flávio Dias Passos,
Fabrizio Marcondes Machado,
Shirlei Maria Recco‐Pimentel Tags: ORIGINAL ARTICLE Source Type: research
Persistence of Meckel's cartilage in sub ‐adult Struthio camelus and Dromaius novaehollandiae
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - October 30, 2018 Category: Zoology Authors: Martina Rachel Crole,
John Thomson Soley Source Type: research
Comparison of microridges in juvenile and adult sunfish, Lepomis gibbosus
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - October 30, 2018 Category: Zoology Authors: Joseph A. DePasquale Source Type: research
Persistence of Meckel's cartilage in sub ‐adult Struthio camelus and Dromaius novaehollandiae
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - October 30, 2018 Category: Zoology Authors: Martina Rachel Crole,
John Thomson Soley Source Type: research
Comparison of microridges in juvenile and adult sunfish, Lepomis gibbosus
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - October 30, 2018 Category: Zoology Authors: Joseph A. DePasquale Source Type: research
The neuromuscular system of the cyclostome bryozoan Crisia eburnea (Linnaeus, 1758)
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - October 24, 2018 Category: Zoology Authors: Katrine Worsaae,
Tobias Frykman,
Claus Nielsen Source Type: research
