Taxonomic Studies on the Hydras of North America. VIII. Description of Two New Species, with New Records and a Key to the North American Hydras

Forrest, Helen

doi:10.2307/3223815

Cited by 21 publications

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“…The Hydra had superficial characteristics close to those of Hydra canadensis (Rowan): a maximum length of 20 mm, tentacles up to five times column length, a northern distribution, and a frequent red coloration (Rowan 1930;Adshead et al 1963;Forrest 1963).…”

Section: Resultsmentioning

confidence: 99%

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Cuker

Mozley

1981

Limnology & Oceanography

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Section: Resultsmentioning

confidence: 99%

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Cuker

Mozley

1981

Limnology & Oceanography

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“…Period IV: Modern work Schulze's system of classification was immediately accepted by workers in the field, and was followed in most works on taxonomy of hydra: Hyman ( 1928Hyman ( , 1929Hyman ( , 1930Hyman ( , 193 la, 1931Hyman ( b, 1938Hyman ( , 1959, Ewer (1948), Brien & Reniers-Decoen (1949, 1950 1 ), Kanaev ( 1952), Semal-van Gansen ( 1953, 1954, Forrest ( 1959Forrest ( , 1963, Brien ( 196 1, 1965), Grayson ( 197 1 ) and Holstein ( 1989). For some reason, Schulze's many taxonomic decisions have received essentially no scrutiny from later workers5.…”

Section: Period 11: Explorationmentioning

confidence: 99%

Taxonomy of the European Hydra (Cnidaria: Hydrozoa): a re-examination of its history with emphasis on the species H. vulgaris Pallas, H. attenuata Pallas and H. circumcincta Schulze

Campbell

1989

Zoological Journal of the Linnean Society

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The name Hydra attenuata Pallas is currently applied to the wrong animal. The common brown polyp, which is widely called H. attenuata, was described by Pallas (1766) as Hydra vulgaris. The name H. attenuata Pallas originally referred to an uncommon pale polyp, currently known as H. circumcincta Schulze. The history of this confusion is analysed here. The taxonomy of hydra was in disarray during the 18th and 19th centuries, and was clarified in 1917 with the monograph of Schulze. But Schulze misapplied the name for the common hydra, H. vulgaris, to an unusual form and thus was led to assign the name of a rare hydra, H. attenuata, to the common type. Schulze redescribed the rare, pale hydra that Pallas had named H. attenuata as H. circumcincta. The correct name of the common European brown, stalkless hydra is thus H. vulgaris Pallas, 1766. The name H. attenuata has priority for the uncommon pale hydra, but because of disuse of this application of the name, the pale hydra should be recognized by the current, generally accepted binominal H. circumcincta Schulze, 1914.

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“…In some cases, the form, proportions and relative sizes of the nematocysts were the guide more simple and reliable for the separation of the species; today we know that the entire complex of characters shown by a form must be taken into account (Forrest, 1963); many times, this characteristics varies considerably and depending on the stage of development of the nematocysts (Weill, 1934). In Hydra hymanae Hadley &Forrest, 1949 andHydra americana Hyman, 1929, for example, the nematocysts are closely similar, but the hydras differ importantly in other aspects like relative length of tentacles and sexual characters (Forrest, 1963).…”

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confidence: 99%

“…In Hydra hymanae Hadley &Forrest, 1949 andHydra americana Hyman, 1929, for example, the nematocysts are closely similar, but the hydras differ importantly in other aspects like relative length of tentacles and sexual characters (Forrest, 1963).…”

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confidence: 99%

“…ÖstMan et al (1987) revealed a considerable variation in cnidoma biometry for hydrozoan populations from a variety of Mediterranean and Scandinavian shores. itô (1951) found statistically significant differences in shapes and sizes of stenoteles and holotrichous isorhiza from populations of Hydra robusta (itô, 1947) collected from widely separated localities, but this differences was not present for populations located in habitats more nearby (Forrest, 1963).…”

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confidence: 99%

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Biometric and statistical investigations on the cnidoma of the genus Hydra (Cnidaria, Hydrozoa)

Deserti

Zamponi

2012

Iheringia, Sér. Zool.

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RESUMEN. Investigaciones biométricas y estadísticas en el cnidoma del género Hydra (Cnidaria, Hydrozoa). El presente estudio utiliza los nematocistos como fuente de información biométrica para llevar a cabo comparaciones entre las especies Hydra vulgaris Pallas, 1766, Hydra vulgaris pedunculata Deserti et al., 2011 y Hydra pseudoligactis (Hyman, 1931. La utilización de dicha herramienta nos permitió realizar comparaciones estadísticas y sumar los resultados obtenidos a la identificación clásica de especímenes pertenecientes a diferentes grupos clasificatorios. Utilizando entonces la biometría de los nematocistos, se hallaron diferencias estadísticamente significativas al comparar especies distintas, individuos de cada especie y tipos de nematocistos. Se observo variación del tamaño de las cápsulas de los nematocistos atrico isorriza y holotrico isorriza para la especie H. vulgaris en relación al tamaño de la columna del ejemplar. PALABRAS-CLAVE. Nematocistos, biometría, análisis estadísticos.ABSTRACT. This paper deals about the nematocysts like a source of biometric information for comparison between the species Hydra vulgaris Pallas, 1766, Hydra vulgaris pedunculata Deserti et al., 2011 and Hydra pseudoligactis (Hyman, 1931). This biometric tool lets us carry out statistical comparisons and adding these results to the identification of specimens from different classificatory groups. In this particular study, we obtained significant differences between species, individuals of each species and nematocysts type when compared the biometry of its nematocysts. Another result was the variation in of particular nematocysts, like atrichous isorhiza and holotrichous isorhiza for the species H. vulgaris in relation to the column size.

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Taxonomic Studies on the Hydras of North America. VIII. Description of Two New Species, with New Records and a Key to the North American Hydras

Cited by 21 publications

References 0 publications

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Summer population fluctuations, feeding, and growth of Hydra in an arctic lake1

Taxonomy of the European Hydra (Cnidaria: Hydrozoa): a re-examination of its history with emphasis on the species H. vulgaris Pallas, H. attenuata Pallas and H. circumcincta Schulze

Biometric and statistical investigations on the cnidoma of the genus Hydra (Cnidaria, Hydrozoa)

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