(Hanleya hanleyi)

Almennt

Hanleya hanleyi (Bean, 1844)

Synonyms:

Chiton hanleyi Bean in Thorpe 1844

Chiton nagelfar Lovén, 1846

Chiton abyssorum M. Sars MS, Jeffreys, 1865

Hanleya abyssorum Knuden, 1949

Reference to best descriptions of the species: Kaas & Van Belle 1985a: 193-196, Fig. 91. Muus 1959: 40-41, Fig. 23. Kaas & Van Belle (1985a) also describes H. nagelfar on pp 196-199, fig. 92.

BIOICE samples and (no specimens): 2056 (25), 2074 (1), 2099 (6), 2126 (1), 2150 (1), 2154 (4), 2161 (5), 2167 (2), 2168 (4), 2219 (1), 2264 (1), 2300 (1), 2305 (1), 2357 (1), 2463 (1), 2487 (3), 2493 (1), 2520 (1), 2522 (4), 2524 (4), 2533 (1), 2568 (2), 2592 (2), 2595 (2), 2597 (3), 2608 (1), 2710 (5), 2720 (2), 2813 (1), 2823 (1), 2824 (3), 2839 (4), 2844 (1), 2850 (1), 2877 (2), 2878 (2), 2889 (1), 2893 (3), 2897 (2), 2928 (1), 2939 (1), 2940 (2), 2943 (5), 2944 (1), 2951 (2), 2957 (2), 2959 (1), 2981 (1), 3001 (1), 3002 (1), 3004 (1), 3010 (1), 3026 (2), 3028 (1), 3029 (1), 3033 (1), 3046 (4), 3047 (3), 3050 (2), 3056 (2), 3064 (1), 3552 (2), 3554 (2), 3558 (2), 3561 (2), 3562 (2), 3565 (1), 3568 (2), 3586 (23), 3589 (30), 3597 (1), 3603 (4), 3604 (3), 3610 (2), 3611 (3),

Other records: North West and West of Iceland, 2 localities (Knudsen 1949)

Bathymetrical range within the area: 68 - 1085 m

Substrate: Gravely sand, gravel, stones, boulders

Temperature: 2.7° - 7.2 °C

Water mass: 34.86 - 35.14

World distribution:  Greenland, Iceland, Barents Sea south to Skagerrak, the Faroes, British Isles, Rockall Bank, Ireland and further to the Canary Islands, Madeira, the Azores and the Mediterranean; in East America south to Massachusetts Bay.

World bathymetrical range: 15 - 800 m

Remarks: The species Hanleya nagelfar was described by Lovén in 1846, and ever since it has puzzled scientists. Some have considered it to be a varity of Hanleya hanleyi occuring in deeper water only, or it has been considered a real species, mainly found in sponge communities, whereas H. hanleyi usually lives on hard substrates, like rocks, shells, and stones, feeding on detritus and occasionally on small sponges.

Warén and Klitgaard (1991) gave the taxonomic problems regarding this species a thorough consideration. Later Audun Schrøder-Nielsen (2009) in his master thesis used genetics combined with morphometric characters, in an attempt to distinguish the two species. He analyzed characters based on more than 100 specimens of Hanleya including “typical” H. nagelfar sampled during BIOICE programme. He concluded that the diagnostic characters that had so far been used to separate H. hanleyi and H. nagelfar in Scandinavian waters, were not effective. However, he did find variation in the protein coding mitochondrial gene cytochrome b within specimens which correlated with differences in radular morphology. These results could indicate presence of a cryptic species within Hanleya in the Northern European Atlantic. Therefore, to establish differences in cryptic Hanleya species of the North Atlantic, requires close examination of radula and DNA sequencing (Schrøder-Nielsen 2009). Todt et al. (2009) studied finds of H. hanleyi (as H. nagelfar) in combination with finds of sponge species as pray for the chiton species, especially a sponge-sponge-chiton association. When publishing the article in 2009 the authors were probably not aware of the work by Schrøder-Nielsen (2009).

Cite this page as: Jon-Arne Sneli and Gudmundsson, G. (2018). Polyplacophora (Nökkvar). http://ni.is/biota/animalia/mollusca/polyplacophora/hanleya-hanleyi

References at: http://ni.is/biota/animalia/mollusca/polyplacophora

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Guðmundur Guðmundsson maí 2018

Biota

Tegund (Species)
(Hanleya hanleyi)