Eucyclotoma albomacula

Eucyclotoma albomacula is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.[1] It was first described by E. Alison Kay in 1979 and is distinguished by a single spiral keel on each whorl with axial white stripes; the species name (albomacula) is derived from the Latin albo (white) and macula (speck or spot).[2]

Eucyclotoma albomacula
Eucyclotoma sp., specimen at French National Museum of Natural History (Muséum National d'Histoire Naturelle), Paris
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Conoidea
Family: Raphitomidae
Genus: Eucyclotoma
Species:
E. albomacula
Binomial name
Eucyclotoma albomacula
Kay, 1979

Description

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The shell varies greatly in length, with specimens ranging in size from 2 mm to 8 mm (0.08 - 0.31 inches).[3] The holotype has a diameter of 2 mm (0.08 inches) and a length of about 7.75 mm (0.3 inches). The shell is tall-spired, thin, with a sloping spiral keel on each whorl. The shell is described as glossy, chestnut brown with three axial streaks of white colour. Its spire consists of a protoconch of two and a half whorls, a teleoconch of c. nine whorls, and an indistinct suture marked by a spiral head and a linear spiral of white and brown. It has a widely oval aperture about one-fifth the total length of the shell, a thin outer lip with protrusions of the spiral keels.[2]

Distribution

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Eucyclotoma albomacula are rare, found at mesophotic depths between 59 m to 195 m (194 - 640 ft). They are thought to be endemic to the Hawaiian Islands.[3] The holotype was collected at a depth of 60 m (197 ft), in Kepuhi Point, O'ahu. Specimens have been collected from Lāna'i, Ni'ihau, French Frigate Shoals, Laysan, Salmon Bank, Pearl and Hermes Atoll, Midway Atoll, and Kure Atoll.[3]

[3]
Specimens at Bernice P. Bishop Museum Shell length (mm) Site collected Depth range
1 (holotype specimen) 7.75 Kepuhi Point, O’ahi 60 m
3 specimens 3.9 - 6.0 Lāna‘i 75 m - 91 m
1 specimen 4.6 Ni‘ihau 59 m
1 specimen 7.0 French Frigate Shoals 85 m
1 specimen 2.5 Laysan 64 m
2 specimens, 1 partial shell 2.7 - 3.5 Salmon Bank 82 m (partial shell found at 91 m)
12 specimens, 1 partial shell 2.2 - 3.0 Pearl and Hermes Atoll 55 m - 98 m (partial shell found at 85 m)
7 specimens, 1 partial shell 2.2 - 5.7 Midway Atoll 59 m - 65 m (partial shell found at 84 m)
4 specimens 2.0 - 6.8 Kure Atoll 88 m - 94 m

This table does not represent every specimen of Eucyclotoma albomacula collected, merely specimens in possession of the Bernice P. Bishop Museum, Honolulu, Hawaii.

See also

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References

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  1. ^ a b Eucyclotoma albomacula Kay, 1979. Retrieved through: World Register of Marine Species on 5 April 2010.
  2. ^ a b Kay, E. Alison, ed. (1979). Reef and shore fauna of Hawaii. 4: Mollusca / E. Alison Kay. Bishop Museum special publication. Honolulu, Hawai'i: Bishop Museum Press. p. 358. ISBN 978-0-910240-26-0.
  3. ^ a b c d Polhemus, Dan A. (12 April 2020). "New Records and Updated Distributional Data for Marine Micromollusks (Mollusca: Gastropoda) from the Mesophotic Depth Zone of the Hawaiian Islands" (PDF). Bishop Museum Occasional Papers (133): 13.
  • Severns, M. (2011). Shells of the Hawaiian Islands - The Sea Shells. Conchbooks, Hackenheim. 564 pp.
  • Liu J.Y. [Ruiyu] (ed.)(2008). Checklist of marine biota of China seas. China Science Press. 1267 pp
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