Overview

Comprehensive Description

Description

 

Nacella concinna (Strebel, 1908)

 

(Pl. 176, figs. 1-5)

 

 

Range—South Georgia, South Orkneys, South Shetlands, Bouvet Island, Seymour Island, Paulet Island, Wandel Island, Anvers Island and Petermann Island.

 

Remarks—Unfortunately the well-known name of this species, Patella polaris Hombron & Jacquinot, 1841, falls as a homonym of the same combination of Röding, 1798. However there is a substitute name available, in Patinella polaris concinna Strebel, 1908, from South Georgia, and this name, concinna, may be used specifically, since there appears to be no real difference between the shallow-water 'polaris’ and the deeper- water concinna, other than a gradual tendency towards lower profile, lighter build, more clear‑cut ribbing and paler coloration as the depth increases. Strebel's concinna, described as a Patinella, does not conflict with the Japanese acmaeid that was originally described as Patella concinna Lischke. The species lives from the intertidal zone down to 110 metres.

 

 

Description (shallow-water 'polaris' form)— Shell moderately large, up to 60 mm. (2⅜ inches) in length, elongate ovate, rather thin, moderately elevated, with the apex between central and the anterior third. Sculptured with distant weak radial ribs in young shells, but the ribbing be­comes subobsolete to obsolete in the adult. Col­our, externally pale brownish; internally very dark bronzy-brown, almost black, the spatula sometimes a paler chestnut-brown.

 

Description (deeper-water typical form)—Shell usually small, 20 to 32 mm. (¾ to 1¼ inches) in length, thin and fragile, elongate ovate, moder­ately elevated and with the apex at about the anterior third. Sculptured with about 28 to 30 narrow radial (ribs, crossed by dense fine lamel­lose growth lines. Colour buff, sparingly blotched in reddish brown; interior cream, shining, vary­ingly maculated with pale reddish brown. Some larger examples, approaching the larger shallow-water form in size, tend to flatten out at the margin, towards which the radial sculpture be­comes subobsolete.

 

 

Measurements (mm.)—

                                              
 

length

 
 

width

 
 

height

 
 

 
 

58.0

 
 

42.0

 
 

19.0

 
 

Palmer Archipelago, 4-10 metres; (‘polaris’ form)

 
 

44.0

 
 

31.0

 
 

18.5

 
 

S. Orkneys (‘polaris’ form)

 
 

42.0

 
 

29.0

 
 

9.0

 
 

S. Georgia, 27 metres: (intermediate form)

 
 

31.0

 
 

21.5

 
 

11.0

 
 

S. Georgia (‘polaris’ form)

 
 

29.0

 
 

20.0

 
 

8.0

 
 

S. Georgia, 18 metres: (typical concinna)

 
 

25.0

 
 

17.0

 
 

6.25

 
 

S. Georgia (typical concinna)

 
 

 

Synonymy—

 

1841 Patella polaris Hombon & Jacquinot, Ann. Sci. Nat. Zool., vol. 16, p. 191 (non Röding, 1798).

 

1886 Patella polaris H. and J. Martens and Pfeffer, Moll. Süd-Georgien, J. hamb. wiss. Anst., vol. 3, p. 101, pl. 2, figs. 11-13.

 

1891 Nacella (Patinella) polaris H. and J. Pilsbry, Man. Conch., vol. 13, p. 120, pl. 49, figs. 21-27.

 

1908 Patinella polaris H. and J. Strebel, Wiss. Ergeb. schwed. Südpolar-Exped. (1901-3), vol. 6, p. 81, pl. 5, fig. 77.

 

1908 Patinella polaris concinna Strobel, Wis. Ergeb. schwed. Südpolar-Exped. (1901-3), vol. 6, p. 82, pl. 5, figs. 76 a-e, 78 a, b.

 

1951 Patinigera polaris H. and J. Powell, Discovery Rep., vol. 26, p. 82.

 

1951 Patinigera polaris concinna Strebel, Powell, Discovery Rep., vol. 26, p. 83.

 

 

Records—SOUTH GEORGIA (type of ‘polaris’): Cumberland Bay, 15-25 metres (type of concinna); East Cumberland Bay 18-110 metres; Moltke Harbour, in rock pool; Stromness Harbour, 26-35 metres; Undine Harbour, 18-27 metres. SOUTH ORKNEYS: Signy Island, 18-27 metres; Normanna Strait, 24-36 metres (`Discovery II'; Powell, 1951). SOUTH SHETLANDS: Deception Island, 5-60 metres; Nelson Island, shore; Livingston Island, shore; Wilhelmina Bay, Danco Land, 1-8 fathoms (‘Discovery II’; Powell, 1951). PALMER ARCHIPELAGO: Melchior Island, 4-10 metres. Bouvet Island, 40-45 metres (‘Discovery II’; Powell, 1951). Seymour, Paulet, Wandel, Anvers and Petermann Islands (Strebel, 1908; Lamy, 1911).”

 

 

(Powell, 1973: 193-195)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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Ecology

Habitat

Depth range based on 22 specimens in 1 taxon.
Water temperature and chemistry ranges based on 15 samples.

Environmental ranges
  Depth range (m): 0 - 909.5
  Temperature range (°C): -0.780 - 0.444
  Nitrate (umol/L): 26.960 - 29.217
  Salinity (PPS): 33.818 - 33.949
  Oxygen (ml/l): 7.190 - 7.913
  Phosphate (umol/l): 1.726 - 1.880
  Silicate (umol/l): 27.223 - 65.005

Graphical representation

Depth range (m): 0 - 909.5

Temperature range (°C): -0.780 - 0.444

Nitrate (umol/L): 26.960 - 29.217

Salinity (PPS): 33.818 - 33.949

Oxygen (ml/l): 7.190 - 7.913

Phosphate (umol/l): 1.726 - 1.880

Silicate (umol/l): 27.223 - 65.005
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Nacella concinna

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 5 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

GGGACTGGTTTA---AGTATGCTTATTCGTGCTGAGCTGGGGCAGCCTGGAGCTTTGTTGGGTGAT---GATCAGTTGTATAATGTTATTGTTACTGCTCATGCTTTTGTAATAATTTTTTTTTTAGTGATACCTATAATAATTGGGGGGTTTGGTAACTGGCTTGTTCCTTTAATG---TTGGGGGCCCCTGATATGGCTTTTCCTCGGTTAAATAATATGAGTTTCTGGTTACTTCCTCCTTCTCTATTTTTATTGCTTAGTTCTTCTGCGGTTGAAAGTGGGGTTGGAACTGGGTGAACTGTTTATCCGCCGTTGTCTAGGAATGTTGCTCACTCCGGTGCTTCTGTAGATTTG---GCTATTTTTTCTCTTCATTTGGCTGGTGTGTCTTCTATTTTAGGGGCTGTTAATTTTATTACTACCGTTATTAATATTCGTTGACAAGGGCTTCAGTTTGAGCGGCTTCCTTTATTTGTTTGGTCTGTGAAGATTACTGCTATTTTACTTCTTCTTTCTTTGCCTGTATTAGCCGGT---GCTATTACTATGCTTTTGACTGATCGTAATTTTAATACTTGTTTTTTTGACCCCGGGGGTGGTGGTGACCCTATTCTTTAT
-- end --

Download FASTA File
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Nacella concinna

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Nacella concinna

Nacella concinna is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets.


Contents

Description

The shell of Nacella concinna grows to about 6 centimetres (2.4 in) long with deep water specimens being rather smaller. It is an elongated ovate, moderately elevated cone with a low apex somewhat towards the anterior margin and angled in that direction. There are about 30 faint radial ribs and a series of fine concentric lines that indicate the annual growth rings. The exterior of the shell is varying shades of pale brown and grey and the interior is dark purplish-brown in deep water specimens but creamy-brown in those from shallow water. The mantle has a fringe of short tentacles.[2]

Distribution

Nacella concinna is found on the seabed of the Scotia Sea between Tierra del Fuego and the Antarctic Peninsula. The range includes South Georgia, the South Orkneys, the South Shetlands, Bouvet Island, Seymour Island, Paulet Island, Wandel Island, Anvers Island and Petermann Island. The depth range varies from the inter-tidal zone down to 935 metres (3,068 ft) though most specimens come from shallow waters a few metres deep.[2]

Biology

Nacella concinna moves around on rocks and soft substrates feeding on algae and diatoms. Its growth rate is slow and it is said to grow to 41 millimetres (1.6 in) in 21 years and live as long as 60 years.[3] It is gonochoristic, individuals being either male or female, and fertilisation is external. The larval development has been little studied. Spawning takes place in the spring algal bloom period. Mature adults often synchronise their spawning, forming spawning towers or groups of up to 35 individuals which may persist for a week or more. These structures are considered likely to improve fertilisation rates as sperm flows have been observed to cascade down the towers in calm water situations. Even in moving water, sperm concentrations are higher and fertilisation is more likely to occur.[3]

References

  1. ^ WoRMS (2010). "Nacella concinna (Strebel, 1908)". World Register of Marine Species. http://www.marinespecies.org/aphia.php?p=taxdetails&id=197296. Retrieved 2012-02-16. 
  2. ^ a b Nacella (Patinigera) concinna (Strebel, 1908) The Smithsonian National Museum of Natural History. Retrieved 2012-02-16.
  3. ^ a b Powell, Dawn K., P.A. Tyler and L.S. Peck (2001). "Effect of sperm concentration and sperm ageing on fertilisation success in the Antarctic soft-shelled clam Laternula elliptica and the Antarctic limpet Nacella concinna". Marine Ecology Progress Series 215: 191–200. http://www.int-res.com/articles/meps/215/m215p191.pdf. 
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