PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Hydrozoa

Taxonomy

Hydrozoa was named by Owen (1843). It is extant. It was considered monophyletic by Kayal et al. (2013).

It was assigned to Coelenterata by Ulrich (1904); to Cnidaria by Barnes (1998) and Sepkoski (2002); and to Medusozoa by Kayal et al. (2013).

Synonymy list

Year	Name and author
1843	Hydrozoa Owen
1904	Hydrozoa Ulrich p. 433
1998	Hydrozoa Barnes p. 183
2002	Hydrozoa Sepkoski
2013	Hydrozoa Kayal et al.

Is something missing? Join the Paleobiology Database and enter the data

Rank	Name	Author
kingdom	Animalia	()
phylum	Cnidaria	Hatschek 1888
subphylum	Medusozoa

Rank	Name	Author
class	Hydrozoa	Owen 1843
class	Hydrozoa	Owen 1843

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Cl. Hydrozoa Owen 1843

show all | hide all

G. †Delheidia

G. †Fistulella Shuysky 1970

G. †Graptogeitonia

Or. Hydroida Johnston 1836

G. †Archaeonectris

Subor. Calyptoblastina Allman 1871

G. †Archaeoantennularia

Fm. Campanulariidae Johnston 1836

Subfm. Campanulariinae Johnston 1836

G. †Mesodendriurn Waggoner and Langer 1993

G. Hydrallmania Hincks 1869

†Hydrallmania graptolithiformis Voigt 1973

G. †Kristinella

G. †Mesokylix

G. †Palaeokylix

G. †Palaeotuba

G. †Protohalecium

G. †Sphenoecium

G. †Cambrohydra Hu 2005

†Cambrohydra ercaia Hu 2005

Subor. †Chondrophorina Chamisso and Eysenhardt 1821

Fm. †Chondroplidae Wade 1971

G. †Palaelophacmaea

†Palaelophacmaea valentinei Waggoner and Collins 1995

G. †Gelenoptron Conway Morris 1993

G. †Clyxhydra Kozlowski 1959

G. †Drevotella Nitecki and Richardson 1972

G. †Flexihydra

Subor. Gymnoblastina Bayer et al. 1956

Fm. Hydractiniidae Agassiz 1862

G. †Cycloporidium

G. †Philippinactinia

G. †Stromactinia

Fm. Oceaniidae Eschscholtz 1829

G. †Crucimedusina

G. †Inocaulis Hall 1852

†Inocaulis plumulosa Hall 1852

Fm. †Lafoeidae Hincks 1868

G. †Filelloides Jarms and Voigt 1994

†Filelloides cretacea Jarms and Voigt 1994

G. †Mazohydra

G. †Palaeacmea

†Palaeacmea solarium Angelin and Lindström 1880

G. †Palaeonectris

G. †Parleria

G. †Pontifennia Cope 2005

†Pontifennia gracilis Cope 2005

G. †Protulophila

G. †Psammactinia

G. †Rhabdohydra

Subor. Thecata Fleming 1828

G. †Eisenackiella Taylor 1988

†Eisenackiella thanetensis Taylor 1988

Subcl. Hydroidolina Collins 2000

Or. Anthoathecata Cornelius 1992

Subor. Capitata Kuhn 1913

Superfm. Porpitoidea Goldfuss 1818

G. †Bertratis Larson and Briggs 2023

Fm. Porpitidae Goldfuss 1818

G. †Kerunia Mayer-Eymar 1899

†Kerunia cornuta Mayer-Eymar 1899

Or. †Lemniscaterina Gallitelli 1979

Fm. †Cassianastraeidae Montanaro-Gallitelli 1980

G. †Cassianastraea Volz 1897

†Cassianastraea reussi Laube 1865

Invalid names: Hydrosclera plumosa Gaetani and Fois 1978 [synonym]

Invalid names: Hydrosclera Gaetani and Fois 1978 [synonym]

G. †Pentasmilia Deng 2006

†Pentasmilia guangxiensis Deng 2006

Invalid names: Lemniscateridae Montanaro-Gallitelli [empty]

G. †Likinia

Or. †Limnomedusae Kramp 1938

Fm. †Olindiadidae Haeckel 1879

G. †Progonionemus Grauvogel and Gall 1962

†Progonionemus vogesiacus Grauvogel and Gall 1962

Fm. †Milleporidae

G. †Milleaster Ulrich 1904

†Milleaster incrustans Ulrich 1904

†Milleaster subramosus Ulrich 1904

G. †Permostroma Wu 1991

†Permostroma sinensis Wu 1991

Or. Milleporina [fire coral]

Fm. †Axoporidae Boschma 1951

G. †Axopora

†Axopora aggtelekensis Scholz 1972

†Axopora cleithridium Squires 1958

G. †Axoporella

G. †Diamantopora

Fm. †Heterastrididae Frech 1890

G. †Heterastridium Reuss 1865

†Heterastridium conglobatum Reuss 1854

Invalid names: Stoliczkaria [synonym]

G. Millepora

†Millepora alcicornis Linnaeus 1758

†Millepora depauperata Reuss 1864

Invalid names: Millepora cylindrica Reuss 1864 [synonym]

†Millepora dichotoma Forskal 1775

†Millepora irregularis Rehfeld and Ernst 1998

†Millepora mammillaris d'Achiardi 1867

†Millepora platyphylla Hemprich and Ehrenberg 1834

†Millepora subpirenaica Altuna et al. 2007

†Millepora verrucosa Reuss 1868

G. †Palaeomillepora

G. †Subaxopora

Fm. †Nigriporellidae Rigby 1958

G. †Tubiphytes Maslov 1956

†Tubiphytes gracilis Schafer and Senowbary-Daryan 1983

†Tubiphytes polyvesica Wu 1991

†Tubiphytes spinalis Wu 1991

†Tubiphytes tubularis Wu 1991

G. †Plumalina Hall 1858

†Plumalina gracilis Hall 1858

G. †Rhizostromella

G. †Roseoporella

†Roseoporella heuvelmansi Zapalski 2012

Or. Siphonophorida

G. †Protolyella

Fm. Velellidae Brandt 1835

G. †Plectodiscus Ruedemann 1916

†Plectodiscus berlinensis Hogler and Hanger 1989

†Plectodiscus discoideus Rauff 1939

Invalid names: Silurovelella Fisher 1957 [synonym]

G. Velella Lamarck 1801

Or. †Sphaeractinida

G. †Globostroma

G. †Paronaria

Or. †Spongiomorphida Alloiteau 1952

G. †Jillua Krumbeck 1913

†Jillua tubifera Krumbeck 1913

Fm. †Spongiomorphidae Frech 1890

G. †Heptastylis Frech 1890

†Heptastylis aquilae Smith 1927

†Heptastylis oregonensis Smith 1927

G. †Spongiomorpha Frech 1890

Subg. †Spongiomorpha (Heptastylopsis) Frech 1890

†Spongiomorpha (Heptastylopsis) gibbosa Frech 1890

†Spongiomorpha (Heptastylopsis) ramosa Frech 1890

†Spongiomorpha (Heptastylopsis) tenuis Smith 1927

†Spongiomorpha acyclica Frech 1890

†Spongiomorpha asiatica Yabe and Sugiyama

†Spongiomorpha globosa Yabe and Sugiyama 1931

†Spongiomorpha minor Frech 1890

†Spongiomorpha tenuis Smith 1927

G. †Stoliczkiella

Or. Stylasterina [lace coral]

G. †Calyptopora

G. †Crypthelia Milne-Edwards and Haime 1849

†Crypthelia vetusta Wells 1976

G. Distichopora

†Distichopora nitida Verrill 1864

G. †Inferiolabiata

G. †Lepidopora

G. †Stenohelia Kent 1870

†Stenohelia boschmai Wells 1976

G. Stylaster

†Stylaster cretaceous Jell et al. 2011

†Stylaster gigas Cairns and Grant-Mackie 1993

†Stylaster milleri Durham 1942

†Stylaster roseus Pallas 1766

Fm. Stylasteridae Gray 1847

Subfm. Errininae Hickson 1912

G. Errina

G. Pliobothrus

†Pliobothrus grantmackiei Squires 1965

G. Sporadopora

Subfm. Stylasterinae Gray 1847

G. Allopora

G. Astya Stechow 1921

†Astya nielseni Wells 1976

G. †Congregopora

G. Conopora

†Conopora mariae Stolarski 1998

Invalid names: Distichoporinae Stechow 1921 [empty]

Or. †Trachylinida

G. †Acsaspedites

G. †Hydrocsaspedota

Subor. Narcomedusina Haeckel 1879

Fm. Cuninidae Broch 1929

G. †Acalepha

Or. †Tubulariae

G. Hydractinia

†Hydractinia cretacea Fischer 1867

†Hydractinia multispinosa Ulrich 1904

G. †Tubuloparietes Schnorf 1960

Invalid names: Actinulida Swedmark and Teissier 1959 [empty], Hydrocorallinae Mosley [empty], Narcomedusae Haeckel 1879 [empty]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

aragonitec

Locomotion:

stationaryc

Attached:

yesc

Life habit:

epifaunalc

Diet:

carnivorec

Diet 2:

suspension feederc

Vision:

blindc

Comments:

COMMENTS: Includes erect, surficial, and pelagic tiering, non-motile attached, facultatively motile attach, non-motile unattached, and fully motile slow motility, and suspension-feeding, predation, photosymbiosis.c

Created:

2007-08-27 03:49:02

Modified:

2010-02-11 07:06:40

Source: c = class

Reference: Kiessling 2004

Age range

Maximum range based only on fossils: base of the Atdabanian to the top of the Holocene or 521.00000 to 0.00000 Ma
Minimum age of oldest fossil (stem group age): 516.0 Ma

Collections (669 total)

Time interval	Ma	Country or state	Original ID and collection number
Oldest occurrences
Atdabanian	521.0 - 516.0	China (Yunnan)	Cambrohydra ercaia (90133)
Delamaran	511.2 - 506.5	USA (California)	Palaelophacmaea valentinei (218890)
Middle Cambrian	509.0 - 497.0	USA (Utah)	Hydrozoa indet. (96868)
Drumian	504.5 - 500.5	USA (Utah)	Sphenoecium wheelerensis, Narcomedusae indet. (230679)
Marjumian	504.5 - 497.0	USA (Utah)	Sphenoecium wheelerensis (230682)
Tremadoc	486.5 - 477.7	China (HeBei)	Inocaulis sp. (7985)
Floian	477.7 - 470.0	China (Hunan)	Inocaulis sp. (226639)
Floian	477.7 - 470.0	Russian Federation (Siberia)	Palaeacmea humilis (206297)
Fennian	470.7 - 468.0	United Kingdom (Wales)	Pontifennia gracilis (87604)
Dapingian - Middle Ordovician	470.0 - 458.4	Russian Federation	Tubiphytes sp. (154813)
Darriwilian	467.3 - 458.4	Algeria	Inocaulis gigas (196943)
Darriwilian	467.3 - 458.4	Russian Federation (Siberia)	Palaeacmea sp. (206300)
Caradoc	458.4 - 449.5	USA (New York)	Inocaulis aborescens (340)
Katian - Hirnantian	453.0 - 443.4	Russian Federation (Siberia)	Inocaulis sp. (205665)
Edenian	451.0 - 450.2	USA (Pennsylvania)	Inocaulis sp. (34895)
Maysvillian	450.2 - 449.6	Canada (Manitoba)	Inocaulis canadensis (174050)
Llandovery	443.4 - 433.4	USA (Michigan)	Inocaulis sp. (532)
Wenlock	433.4 - 427.4	Canada (Ontario)	Inocaulis sp. (26855)
Wenlock	433.4 - 427.4	USA (New York)	Inocaulis plumulosa (226164)
Wenlock	433.4 - 427.4	United Kingdom	Hydroida indet. (68060)