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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 Halecium scutum Clark, 1976 
Arctic Ocean for Halecium halecinum (Linnaeus, 1758) 
Arctic Ocean for Halecium labrosum Alder, 1859 
Arctic Ocean for Halecium scutum Clark, 1976 
Arctic Ocean for Halecium textum Kramp, 1911 
Atlantic Europe for Halecium mediterraneum Weismann, 1883  (doubtful)
Azores for Halecium labrosum Alder, 1859  (doubtful)
Brittany for Halecium labrosum Alder, 1859 
Canada for Halecium textum Kramp, 1911 
Cape Farewell for Halecium scutum Clark, 1976 
East Atlantic for Halecium halecinum (Linnaeus, 1758) 
English Channel for Halecium lankesterii (Bourne, 1890) 
Faroe Islands for Halecium scutum Clark, 1976 
Faroe Islands for Halecium textum Kramp, 1911 
Galicia for Halecium mediterraneum Weismann, 1883  (doubtful)
Greenland for Halecium textum Kramp, 1911 
Iceland for Halecium scutum Clark, 1976 
Iceland for Halecium textum Kramp, 1911 
Maroussia for Halecium textum Kramp, 1911 
Mediterranean Sea for Halecium banyulense Motz-Kossowska, 1912 
Mediterranean Sea for Halecium halecinum (Linnaeus, 1758) 
Mediterranean Sea for Halecium lankesterii (Bourne, 1890) 
Mediterranean Sea for Halecium mediterraneum Weismann, 1883 
Mediterranean Sea for Halecium petrosum Stechow, 1919 
Morocco for Halecium mediterraneum Weismann, 1883  (doubtful)
Mozambique for Halecium lankesterii (Bourne, 1890) 
New Zealand for Halecium corrugatissimum Trebilcock, 1928 
North Atlantic for Halecium labrosum Alder, 1859 
North Atlantic for Halecium scutum Clark, 1976 
North Island for Halecium corrugatissimum Trebilcock, 1928 
North Sea for Halecium labrosum Alder, 1859 
North Sea for Halecium lankesterii (Bourne, 1890) 
Pacific Ocean for Halecium halecinum (Linnaeus, 1758) 
South Africa (country) for Halecium halecinum (Linnaeus, 1758) 
South Africa (country) for Halecium lankesterii (Bourne, 1890) 
South Island for Halecium corrugatissimum Trebilcock, 1928 
Spain for Halecium labrosum Alder, 1859  (doubtful)
Subtropical Atlantic for Halecium lankesterii (Bourne, 1890) 
Tropical Atlantic for Halecium lankesterii (Bourne, 1890) 
West Atlantic for Halecium 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
 authority

Clark, 1877 [details]

 Distribution

Cosmopolitan (World Oceans) [details]

 Distribution

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

 Distribution

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

 Taxonomy

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

 type locality

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

 Type locality

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

 Type locality

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

 type locality

Whitstable, Kent, England [details]