Eucyclotoma albomacula

Eucyclotoma albomacula
Eucyclotoma sp., specimen at French National Museum of Natural History (Muséum National d'Histoire Naturelle), Paris
Scientific 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

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]

Description

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

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

• Eucyclotoma
• Raphitomidae
• Tritonoturris

References

1. Eucyclotoma albomacula Kay, 1979 . Retrieved through: World Register of Marine Species  on 5 April 2010.
2. 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. 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

External links

• Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295.
• Kay, E. A. (1979). Hawaiian marine shells. Reef and shore fauna of Hawaii. Section 4: Mollusca. Bernice P. Bishop Museum Special Publications. 64xviii + 1-653
• Moretzsohn, Fabio, and E. Alison Kay. "HAWAIIAN MARINE MOLLUSCS." (1995)