1,722,016 research outputs found
Analytic taxonomy and notes on marine, brackish-water and estuarine Gastrotricha
No full textHummon, William D., Todaro, M. Antonio (2010): Analytic taxonomy and notes on marine, brackish-water and estuarine Gastrotricha. Zootaxa 2392 (1): 1-32, DOI: 10.11646/zootaxa.2392.1.1, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2392.1.
Chaetonotidae Gosse 1864
No full textFamily Chaetonotidae Gosse, 1864 [sensu Leasi & Todaro, 2008] Subfamily Chaetonotinae Gosse, 1864 Genus Aspidiophorus Voigt, 1903Published as part of Kånneby, Tobias & Todaro, M. Antonio, 2017, A new species of Aspidiophorus (Gastrotricha: Chaetonotidae) from the Swedish west coast, pp. 390-394 in Zootaxa 4290 (2) on page 390, DOI: 10.11646/zootaxa.4290.2.11, http://zenodo.org/record/82900
Biodiversità e biogeografia dei Gastrotrichi tra tradizione e approcci innovativi
Full text linkGastrotrichi sono un phylum (Gastrotricha) di microscopici invertebrati bentonici (da 80 μm a 3-5 mm in lunghezza) ubiquitari e spesso abbondanti nei diversi ecosistemi acquatici del mondo. Il clade conta al momento 870 specie suddivise in due ordini, Macrodasyida e Chaetonotida, i cui rappresentanti sono facilmente riconoscibili. I gastrotrichi Macrodasyida sono infatti di aspetto vermiforme ed ermafroditi e si rinvengono quasi esclusivamente nelle sabbie marine, mentre i Chaetonotida hanno una caratteristica forma a birillo con l'estremità posteriore bifida e sono per lo più partenogenetici e dulciacquicoli, anche se due famiglie includono esclusivamente specie marine ermafrodite. La classificazione dei gastrotrichi, tradizionalmente basata sulle caratteristiche anatomiche, e spesso sulle sole ornamentazioni cuticolari, negli ultimi anni ha beneficiato dei risultati dell'applicazione delle moderne tecniche di indagine, sia microscopiche sia molecolari, spesso integrate tra loro. Attualmente lo spettro tassonomico di entrambi gli ordini appare alquanto articolato e meglio definito rispetto agli inizi del secolo. Le 380 specie di Macrodasyida risultano infatti ripartite in 37 generi e 10 famiglie, mentre le 490 specie di Chaetonotida sono distribuite in 33 generi e otto famiglie. Il miglioramento delle conoscenze tassonomiche, a diverso livello gerarchico, è avvenuto anche grazie a studi svolti nei laboratori di UniMORE, alcuni dei quali vengono brevemente illustrati in questa occasione. Anche la comprensione dei dati biogeografici può trovare giovamento se proposti con metodi innovativi, come nel caso delle WebMap interattive su base GIS che stiamo sviluppando per le specie marine e dulciacquicole italiane
Xenotrichulidae Remane 1927
No full textFamily: Xenotrichulidae Remane, 1927 Subfamily: Xenotrichulinae Ruppert, 1979Published as part of <i>Chatterjee, Tapas & Todaro, M. Antonio, 2021, An annotated checklist of the chaetonotidan Gastrotricha from India, pp. 332-350 in Zootaxa 5027 (3)</i> on page 344, DOI: 10.11646/zootaxa.5027.3.2, <a href="http://zenodo.org/record/5449646">http://zenodo.org/record/5449646</a>
Polymerurus magnus Visvesvara 1963
No full textPolymerurus magnus Visvesvara, 1963 Records from India. MAHARASTRA: Nagpur— Visvesvara (1963); GENERAL RECORD: Naidu & Rao (2004). Habitat (as in Indian records). Freshwater; shallow parts of a tank. Distribution. Known only from India. Remarks. The species was found only once. The description was based on five specimens, which according to the author (Visvesvara 1963 ) differ from P. nodicaudus in virtue of the larger body size and the major length of the body spines (improperly called bristles). Schwank (1990) considered the species to be provisionally valid, although the synonymy between the two species seems to be likely. In our opinion further data are needed to confirm or disprove the current status of this species.Published as part of Chatterjee, Tapas & Todaro, M. Antonio, 2021, An annotated checklist of the chaetonotidan Gastrotricha from India, pp. 332-350 in Zootaxa 5027 (3) on page 343, DOI: 10.11646/zootaxa.5027.3.2, http://zenodo.org/record/544964
Not too big for its mouth: direct evidence of a macrodasyidan gastrotrich preyed in nature by a dileptid ciliate
Full text linkNearly ubiquitous and usually speciose in most aquatic habitats, the meiofaunal-sized gastrotrichs are recognized as an important component of marine and freshwater ecosystems. The common observations that gastrotrichs feed on bacteria, microalgae and biodetritus strongly imply that they play a relevant role in linking the microbial loop to the higher trophic levels. Which are the organisms that in turn prey on gastrotrichs is, however, a substantially unexplored question. Inspecting meiofauna samples collected from shallow sites of the Tyrrhenian coast, we had the chance to spot a wild case of a macrodasyidan gastrotrich predated by a dileptid ciliate. This case is documented here with a set of in-vivo photos, jointly with an unequivocal taxonomic identification of the preyed gastrotrich with Paraturbanella teissieri and a tentative identification of the predator ciliate with Pseudomonilicaryon marinus
Chaetonotus (Schizochaetonotus) atrox Wilke 1954
No full textChaetonotus (Schizochaetonotus) atrox Wilke, 1954 Records from India. ANDHRA PRADESH: Bhimilipatnam, Visakhapatnam— Ganapati & Rao (1967), Sarma & Mohan (1981); ODISHA: Gopalpur, Bahuda estuary— Rao (1989). ANDAMAN & NICOBAR ISLANDS: Bomilla creek, East Bay, Hut Bay, Little Andaman— Rao (1980, 1993); LAKSHADWEEP: Kavaratti, Minicoy— Rao (1991); GENERAL RECORD: Naidu & Rao (2004). Habitat (as in Indian records). Marine, intertidal; fine and medium sands, 5 cm below surface between low and high water levels. Distribution. Cosmopolitan. Remarks. The Indian specimens agree with morphometric information on the species provided originally by Wilke (1954) from the Mediterranean Sea. We found in the morphometric account of the species provided by Naidu & Rao (2004) some incongruences with the known morphology of this taxon. First, they report the presence of refractile bodies on the head (presumably eye spots) and second, the say the anus is dorsal. Neither of these traits applies to C. atrox. Moreover, in the legend of Figure 65 they indicate Ferraguti (1996) as the original author of the provided figure. Likely this is material error, because in the references such a paper is not listed and prof. M. Ferraguti (University of Milan), author of many papers regarding the spermatology and reproductive system of the Gastrotricha, denies he is the author of that drawing (personal communication to MAT).Published as part of Chatterjee, Tapas & Todaro, M. Antonio, 2021, An annotated checklist of the chaetonotidan Gastrotricha from India, pp. 332-350 in Zootaxa 5027 (3) on page 338, DOI: 10.11646/zootaxa.5027.3.2, http://zenodo.org/record/544964
I Gastrotrichi del golfo di Squillace e del golfo di Sant’Eufemia (Calabria, Italia)
No full textThe administrative Italian Region Calabria is home to 17 reported species of marine
gastrotrichs. In September 2021, we conducted new investigations focusing on the gulfs of Squillace (Ionian
Sea) and Sant'Eufemia (Tyrrhenian Sea). Nine locations were investigated, taking 1-2 liters of sediment
from each. Taxonomic analysis was conducted on-site using differential interference contrast microscopy.
Altogether, 41 species were found, averaging 11.5 ± 4.7 species per location. Bellini Beach (Doganieri, CZ)
was the richest, with 18 species, followed by Le Castella (KT), with 17 species. Overall, the fauna
documented in 2021 was made up mostly of species already known for Italy; however, 59% of the species
are new to Calabria, including four belonging to the genus Halichaetonotus, not yet reported for the region.
The 2021 findings encourage further research in other underexplored coastal areas of Calabria and other southern regions
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