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Schuchert, P., 2005. Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa). Journal of Natural History 39 8: 607-639.
38714
Schuchert, P.
2005
Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa
Journal of Natural History
39(8): 607-639
Publication
Available for editors  PDF available [request]
Although the genus Halechan is easy to recognize, identifications at the species level are often difficult. this even for quite common and supposedly well-known species of the north-eastem Atlantic. This paper revises and re-describes some Halecium species which resemble each other closely and which are not easy to distinguish. Additional information on a few rare species is also provided. The study is based on material collected from the North Atlantic, Mediterranean. South Africa. and New Zealand. Halecium scutum Clark, 1877 is recognized as a valid species and distinct from both H. beanii and H. halecinum; colony form. and microscopic characters allow a distinction. The pinnate colony form of H. halecinum is a characteristic trait, but not all colonies show this growth form. Halecium beanii can occur in monosiphonic and polysiphonic colonies. Monosiphonic colonies of H. beanii have probably been misidentified by some authors as H. lankesterii. The differences of H. lankesteri to H. beanii and H. petrosum are discussed. The South African population of the reportedly cosmopolitan H. beanii has distinct gonothecae and could belong to a separate species. The Mediterranean Halecium mediterraneum is hardly distinguishable from the New Zealandic H. delicatulum. but it is kept separate mainly for biogeographic reasons. The rare Mediterranean Halecium banyulense is redescribed based on a second find from Naples. The mate gonothecae of Halecium corrugatissimum are described for the first time.
Systematics, Taxonomy
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Alaskan Exclusive Economic Zone for Checked: verified by a taxonomic editorHalecium scutum Clark, 1976 
Arctic Ocean for Checked: verified by a taxonomic editorHalecium halecinum (Linnaeus, 1758) 
Arctic Ocean for Checked: verified by a taxonomic editorHalecium labrosum Alder, 1859 
Arctic Ocean for Checked: verified by a taxonomic editorHalecium scutum Clark, 1976 
Arctic Ocean for Checked: verified by a taxonomic editorHalecium textum Kramp, 1911 
Atlantic Europe for Checked: verified by a taxonomic editorHalecium mediterraneum Weismann, 1883  (doubtful)
Azores for Checked: verified by a taxonomic editorHalecium labrosum Alder, 1859  (doubtful)
Brittany for Checked: verified by a taxonomic editorHalecium labrosum Alder, 1859 
Canada for Checked: verified by a taxonomic editorHalecium textum Kramp, 1911 
Cape Farewell for Checked: verified by a taxonomic editorHalecium scutum Clark, 1976 
East Atlantic for Checked: verified by a taxonomic editorHalecium halecinum (Linnaeus, 1758) 
English Channel for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
Faroe Islands for Checked: verified by a taxonomic editorHalecium scutum Clark, 1976 
Faroe Islands for Checked: verified by a taxonomic editorHalecium textum Kramp, 1911 
Galicia for Checked: verified by a taxonomic editorHalecium mediterraneum Weismann, 1883  (doubtful)
Greenland for Checked: verified by a taxonomic editorHalecium textum Kramp, 1911 
Iceland for Checked: verified by a taxonomic editorHalecium scutum Clark, 1976 
Iceland for Checked: verified by a taxonomic editorHalecium textum Kramp, 1911 
Maroussia for Checked: verified by a taxonomic editorHalecium textum Kramp, 1911 
Mediterranean Sea for Checked: verified by a taxonomic editorHalecium banyulense Motz-Kossowska, 1912 
Mediterranean Sea for Checked: verified by a taxonomic editorHalecium halecinum (Linnaeus, 1758) 
Mediterranean Sea for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
Mediterranean Sea for Checked: verified by a taxonomic editorHalecium mediterraneum Weismann, 1883 
Mediterranean Sea for Checked: verified by a taxonomic editorHalecium petrosum Stechow, 1919 
Morocco for Checked: verified by a taxonomic editorHalecium mediterraneum Weismann, 1883  (doubtful)
Mozambique for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
New Zealand for Checked: verified by a taxonomic editorHalecium corrugatissimum Trebilcock, 1928 
North Atlantic for Checked: verified by a taxonomic editorHalecium labrosum Alder, 1859 
North Atlantic for Checked: verified by a taxonomic editorHalecium scutum Clark, 1976 
North Island for Checked: verified by a taxonomic editorHalecium corrugatissimum Trebilcock, 1928 
North Sea for Checked: verified by a taxonomic editorHalecium labrosum Alder, 1859 
North Sea for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
Pacific Ocean for Checked: verified by a taxonomic editorHalecium halecinum (Linnaeus, 1758) 
South Africa (country) for Checked: verified by a taxonomic editorHalecium halecinum (Linnaeus, 1758) 
South Africa (country) for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
South Island for Checked: verified by a taxonomic editorHalecium corrugatissimum Trebilcock, 1928 
Spain for Checked: verified by a taxonomic editorHalecium labrosum Alder, 1859  (doubtful)
Subtropical Atlantic for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
Tropical Atlantic for Checked: verified by a taxonomic editorHalecium lankesterii (Bourne, 1890) 
West Atlantic for Checked: verified by a taxonomic editorHalecium halecinum (Linnaeus, 1758) 
Unknown type, locality Banyuls-sur-Mer, identified as Halecium banyulense Motz-Kossowska, 1912
Unknown type, locality Banyuls-sur-Mer, identified as Halecium petrosum Stechow, 1919
Unknown type, locality Naples, identified as Halecium mediterraneum Weismann, 1883
Unknown type, locality Plymouth, identified as Halecium lankesterii (Bourne, 1890)
Unknown type, locality United Kingdom, identified as Halecium labrosum Alder, 1859
Unreviewed: has not been verified by a taxonomic editor authority

Clark, 1877 [details]

Unreviewed: has not been verified by a taxonomic editor Distribution

Cosmopolitan (World Oceans) [details]

Unreviewed: has not been verified by a taxonomic editor Distribution

in the North Atlantic reaching south at least to Brittany and North Sea, perhaps even Spain and Azores (Cornelius 1995) [details]

Unreviewed: has not been verified by a taxonomic editor Distribution

Reportedly cosmopolitan (Peña Cantero and Garcïa Carrascosa 2002) not in the Artic regions [details]

Unreviewed: has not been verified by a taxonomic editor Taxonomy

Some records of H. undulatum from the British Isles, the North Sea, Sweden, and Norway could also be H. textum [details]

Unreviewed: has not been verified by a taxonomic editor type locality

Clark (1877) gives several localities in Alaska [details]

Unreviewed: has not been verified by a taxonomic editor Type locality

Maroussia, eastern Greenland, 160-180m (Kramp 1911) [details]

Checked: verified by a taxonomic editor Type locality

near Scarborough, Yorkshire, England (Cornelius 1975) [details]

Checked: verified by a taxonomic editor type locality

Whitstable, Kent, England [details]