Search

Your search keyword '"Antonio Todaro M."' showing total 7 results
Start Over Author "Antonio Todaro M."
7 results on '"Antonio Todaro M."'

1. The unusual spermatozoa of Dolichodasys sp. (Gastrotricha, Macrodasyida).

Author

Guidi, Loretta, Antonio Todaro, M., Cesaroni, Lucia, and Balsamo, Maria

Subjects
*SPERMATOZOA, *GASTROTRICHA, *MACRODASYOIDEA, *MICROSCOPY, *ENDOPLASMIC reticulum
Abstract

The spermatozoon of an undescribed species of Dolichodasys (Cephalodasyidae) from the Pacific coast of Panama was studied at structural and ultrastructural levels. Under optical microscopy, it appears as a short and wide cell with pointed extremities but without a flagellum. The cell body is made up of two well distinct regions: an anterior region with a homogeneous appearance, and a posterior region containing an evident rod-like nucleus. Under TEM, a peripheral layer of microtubules densely arranged extends for the whole cell length. In the anterior cell region, microtubules surround many tubular cisternae of smooth endoplasmic reticulum (SER), and a thin layer of vesicles with a probable acrosomal function lies just beneath the plasma membrane. The rod-shaped nucleus fills up the posterior cell region and forms a pouch that hosts a single large, irregular mitochondrial mass. A hypothesis about the motility of this aflagellate cell is advanced, on the basis of the coexistence of singlet microtubules and SER. The general architecture of Dolichodasys sp. spermatozoon departs from the Macrodasyida sperm basic model, consisting of a filiform cell with a corkscrew-shaped acrosome, a spring-shaped nucleus surrounding a mitochondrial axis and an ordinary flagellum. The unusual morphology of the Dolichodasys sperm seems to be unique in the family Cephalodasyidae: the data available for 6 species belonging to the other 4 genera of the family report spermatozoa perfectly matching the basic sperm plan of the Macrodasyida. A sister-taxon relationship between Dolichodasys and Cephalodasys, two genera drastically different in sperm shape, emerged from recent phylogenetic molecular studies, but it needs confirmation due to the still limited number of molecular data and the likely polyphyletic nature of the family Cephalodasyidae. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

2. Two new interesting species of Macrodasyida (Gastrotricha) from KwaZulu-Natal (South Africa).

Author

Antonio Todaro, M., Zotto, Matteo Dal, Bownes, Sarah J., and Perissinotto, Renzo

Subjects
*MACRODASYOIDEA, *GASTROTRICHA, *ANIMALS, *TAXONOMY, *BENTHOS
Abstract

This study is part of a larger research program aimed at shedding light on meiofauna and macrofauna communities of the subtropical Eastern Province of KwaZulu-Natal, South Africa. Previous articles on the phylum Gastrotricha have detailed faunistic and preliminary taxonomic data on marine and freshwater species found in the iSimangaliso Wetland Park. Here, two new interesting marine macrodasyidan species, in the families Cephalodasyidae and Turbanellidae, are reported from a wider area of the KZN coast. Descriptions are based on observations carried out on living specimens using differential interference contrast microscopy. Pleurodasys incomptus new species is the second species in the genus; surprisingly, it lacks the peculiar gravireceptor organs (pharyngeal knobs) thought to be an autapomorphic trait of the genus. Paraturbanella africana new species is a mid-sized species (up to 520 lm in length), showing a peribuccal swelling; its most obvious autapomorphic trait pertains to the testes, which are located well passed half the body rather than at- or near the pharyngo-intestinal junction as occur in the other species of the genus. The relevant anatomical novelties shown by the two new species testify that current knowledge about gastrotrich basic morphology is far from complete. This holds true also for taxa that are considered to be well-known (e.g. the speciose genus Paraturbanella), and stresses once again the importance of investigating new geographic areas in order to improve our understanding of global gastrotrich morphological diversity and species richness. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

4. Faunistics and zoogeographical overview of the Mediterranean and Black Sea marine Gastrotricha

Author

Antonio Todaro M., Maria Balsamo, Paolo Tongiorgi, and Lucia Matinato

Subjects
Mediterranean climate, Global and Planetary Change, mediterraneo, Ecology, biology, Biogeography, Fauna, Species distribution, Life Sciences, Gastrotrich, Macrodasyida, biology.organism_classification, Gastrotricha, biogeografia, mar nero, meiofauna, invertebrati, zoologia, biologia marina, Chaetonotida, Geography, Mediterranean sea, Ecology, Evolution, Behavior and Systematics
Abstract

Biogeographia vol. XXIV - 2003 (Printed October, 31st 2003) Marine biogeography of the Mediterranean Sea: patterns and dynamics of biodiversity Faunistics and zoogeographical overview of the Mediterranean and Black Sea marine Gastrotricha M. ANTONIO TODARO*, LUCIA MATINATO**, MARIA BALSAMO***, PAOLO TONGIORGI** *Dz'pzzrrz'mem‘o di Bio/ogirz /lnimzzle, Uni:/ersitiz (ii Marian/1 E Reggio Emilirz, Vizz Czzmpi 213/cl’, [~41 I 00 Madcna (Juli)/),' e—mzzz'/: todzzro. zzntonio @zmimo. it **Dzj7zzrti7neI2to di Scierzze Agnzrie, Urziz/erritiz di Marlena e Reggia Emilia, Via Kennmfiz 17, 142100 Reggie Emz'lz'zz (Italy) ***[5tz'tLiz‘0 di Scimze Maifblogic/ye, Universitfz di Ureirzo, Via Oddi 21, I-61029 M~bz'no (Italy) Key words: Gastrotrichs, Biogeography, Meiofauna, Taxonomy, Mediterranean Sea, Black Sea. SUMMARY The paper provides an updated overview of the knowledge regarding the marine gastrotrich fauna of 10 Mediterranean and 2 Black Sea countries. Taxonomic account and species distribution come from published records, including electronically disseminated information, as well as original data from 18 localities (16 western and 2 levantine), investigated by the authors between 1990 and 2002. Since the description of the first marine Mediterranean gastrotrich, Hera)/zlzzijir izgzzm Claparede, 1867, discovered in the Gulf of Naples (Italy), 273 additional species, from 417 locations have been recorded in the basin so far. Of the gastrotrichs found, 143 species, in 24 genera and 6 families, belong to the order Macrodasyida and 131 species, in 11 genera and 3 families, belong to the order Chaetonotida; these statistics include several species as yet not described. The number of species per location is variable, ranging from 1—37, with a global mean of 8.041” 6.69 spp/location. Egypt and Israel show mean values well above the average, with 12.8 and 10.8 spp/loc. respectively, whereas mean values for Algeria, Tunisia, Bulgaria, Croatia, and France are below average (1— 5.43 spp / location); data For Cyprus, Greece, Romania and Italy are within the average value. Arttzzr/Jorlzzrys (Ictz/mtm‘, recorded in 28% of the investigated locations is the most Frequently found macrodasyidan; Htz/it/Jzzetmzatur am/zfi'r, also recorded in 28% of the investigated localities, is the most common chaetonotidan. Data analysis indicated substantial differences among countries, regarding sampling effort and, consequently, faunistic knowledge. In comparison with the generally good information concerning the Italian fauna (177 species from 246 localities), gastrotrichs from other Mediterranean nations are much less known; along with Italy, only few other Nations have been investigated to a sufficient extent (i.e., Greece: 44 sampled localities, 77 recorded species; France: 37 L, 70 spp; Egypt: 28 L, 81 spp; Israel: 15 L, 55 spp; Cyprus: 9 L, 41 spp), whereas investigation carried out in several other countries can be considered, to a variable degree, incomplete (i.e., Algeria: 16 investigated localities and 11 species found; Romania: 7 L, 30 spp; Tunisia: 5 L, 2 spp; Bulgaria: 3 L, 11 spp; Croatia: 1 L, 12 spp, Spain: 1 L, 3 sp, Malta; 2L, 2 spp.), or nil (e.g., Morocco, Libya, Turkey, Albania). All marine gastrotrich Families and most marine genera have representatives in the Mediterranean Fauna, notable absences regard the genera Demzoz/zzryr, Dirzadmjyr, Plzzizat/rziyx, Prostabucttzntizl and perhaps Prezzzfart/1‘brz71e[/zz; on the other hand representatives of two genera, En2_ytI'mji: and Dezzdmpar/01:1, are unknown elsewhere in the world except the western Mediterranean. At species level, about 140 taxa have so Far been found only in the Mediterranean area, whereas the

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results