1,721,078 research outputs found
Zygophylax kakaiba, a new species of hydroid (Cnidaria: Hydrozoa: Zygophylacidae) from the Philippine Islands
No full textCampos, Felipe Ferreira, Marques, Antonio Carlos, Puce, Stefania, Pérez, Carlos Daniel (2016): Zygophylax kakaiba, a new species of hydroid (Cnidaria: Hydrozoa: Zygophylacidae) from the Philippine Islands. Zootaxa 4088 (3): 438-444, DOI: 10.11646/zootaxa.4088.3.
First evidence of a specific association between a stylasterid coral (Cnidaria: Hydrozoa: Stylasteridae) and a boring cyanobacterium
No full textEudendrium (Cnidaria, Anthomedusae) from the Antarctic Ocean with a description of new species.
No full textNematocyst arrangement on the tentacles of the polyps of the genus Eudendrium (Cnidaria, Hydrozoa).
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Investigation of nematocysts in stylasterids (Cnidaria: Hydrozoa: Stylasteridae)
No full textThe type, size, shape and distribution of nematocysts represent important taxonomic characters that help to identify many hydrozoan species. The Stylasteridae is one of the most species-rich hydroid families. Nevertheless, information about the soft tissue and especially data about the nematocysts are still very scant. Scattered data about nematocysts are available in several taxonomic papers, but unfortunately without the type identification or shape description, this information is not very useful. Therefore, several questions still need answers. What types of nematocysts are present in the stylasterid family? Do nematocysts have a particular distribution in the soft tissue? Could they be considered a useful taxonomic character for the family? Is it possible to hypothesize their functions? In order to answer these questions, we analysed 15 stylasterid species belonging to seven genera. Euryteles, desmonemes, isorhizas and probably also mastigophores were identified. All examined species have euryteles and desmonemes, while isorhizas are recorded in two genera and mastigophores in only one genus. Moreover, the shape of the nematocysts in some species is very distinct. The distribution of nematocysts shows that each species contains, in the coenosarc, all nematocysts of its cnidome, while in the polyps there are only euryteles and desmonemes. Our study showed that in integrating the information about nematocyst type, size, shape and distribution, each species investigated herein has a specific cnidome. Therefore, nematocysts have a taxonomic value for stylasterids and, whenever possible, nematocysts should be included in the species descriptions. Moreover, the possible functions of stylasterid nematocysts are given in relation to their type and distribution.</p
THE HYDROID SYMBIOTIC RADIATION
No full textThe sixth workshop of the Hydrozoan Society, Plymouth 18-30 giugno 200
SPATIAL AND TEMPORAL VARIATIONS IN A TROPICAL HYDROID ASSEMBLAGE
No full textThe sixth workshop of the Hydrozoan Society, Plymouth 18-30 giugno 200
Marine beach litter monitoring strategies along Mediterranean coasts. A methodological review
Full text link: Marine beach litter (MBL) represents a serious issue for marine life, coastal ecosystems, human health and several economical activities. The Mediterranean Sea is a semi enclosed basin particularly vulnerable to this problem. Its coasts are threatened by critical anthropogenic pressures that sum up with intensive fishing and shipping, and the slow turnover of its waters. In the last decades, several scientific and participative initiatives have been conducted to study, monitor and clean-up shorelines. These studies were generally characterized by differences in timing and frequency of the surveys, as well as in litter sampling, classification and analysis. This paper presents a systematic review of current literature concerning MBL monitoring strategies along the Mediterranean coasts. Scopus indexed studies are analysed to identify discrepancies and similarities among the applied protocols, understand where current gaps lie, and point out what would be needed to develop a basin-scale efficient monitoring for the Mediterranean Sea
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