Atlanta brunnea | |
---|---|
![]() | |
apical view of the shell of Atlanta brunnea from the Pliocene of Philippines | |
![]() | |
apertural view of the shell of Atlanta brunnea from the Pliocene of Philippines | |
Scientific classification
![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Caenogastropoda |
Order: | Littorinimorpha |
Family: | Atlantidae |
Genus: | Atlanta |
Species: | A. brunnea
|
Binomial name | |
Atlanta brunnea
J. E. Gray, 1850
[2]
| |
Synonyms [4] | |
Atlanta brunnea is a species of sea snail, a holoplanktonic marine gastropod mollusk in the family Atlantidae. [4]
Atlanta brunnea is a small species ( shell diameter to 2.0 mm) that is darkly pigmented (brown to reddish-and golden-brown). [5] The keel is tall and colorless, and inserts between the last and penultimate shell whorls in animals larger than 1.5 mm. [5] The spire is tall and conical, consisting of 4 whorls and possessing a complex pattern of spiral sculpture that ends on the protoconch and is replaced by spiral rows of small punctae on the teleoconch. [5] Coloration ranges from brown to amber and reddish brown. [5]
Juveniles of this species are easily recognised by their shape and ornament. [1] The protoconch is rather high conical and has 3½ - 3¾ whorls, slowly increasing in diameter. [1] On the first whorl, in front of the nucleus, an ornament is seen of some nine or ten irregular spirals. [1] Two stronger spirals from the second whorl on delimit a subsutural zone and the base of the shell. [1] On these spirals the whorl profile is slightly angular. [1] The whole surface of the protoconch is furthermore covered with numerous finer spirals in an irregular zigzag shape, also on the base and within the umbilicus. [1] The boundary with the teleoconch is made distinct by the sudden disappearance of these spirals. [1] From that point on the whorl diameter increases rapidly, by which the shape of the shell becomes lenticular. [1] Somewhat more than one teleoconch whorl is present in the largest specimens. [1] The periphery of the body whorl is angular and bears a distinct flange-like keel. [1] The protoconch is visible in an apertural view. [1]
Eyes aretype a, operculum is type a, and radula type I. [5]
Description overview:
Atlanta brunnea has an almost worldwide tropical and subtropical distribution pattern. [1]
Atlanta brunnea is known from the Pliocene of Anda, Pangasinan, Luzon, Philippines. [1]
It is limited to the upper 100 m of the water column in Hawaiian waters. [5] Comparison of day and night vertical distribution of abundances suggested that a portion of the population from 50 to 100 m migrated into the upper 50 m at night. [5]
This article incorporates CC-BY-3.0 text from references. [1] [5]
Atlanta brunnea | |
---|---|
![]() | |
apical view of the shell of Atlanta brunnea from the Pliocene of Philippines | |
![]() | |
apertural view of the shell of Atlanta brunnea from the Pliocene of Philippines | |
Scientific classification
![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Caenogastropoda |
Order: | Littorinimorpha |
Family: | Atlantidae |
Genus: | Atlanta |
Species: | A. brunnea
|
Binomial name | |
Atlanta brunnea
J. E. Gray, 1850
[2]
| |
Synonyms [4] | |
Atlanta brunnea is a species of sea snail, a holoplanktonic marine gastropod mollusk in the family Atlantidae. [4]
Atlanta brunnea is a small species ( shell diameter to 2.0 mm) that is darkly pigmented (brown to reddish-and golden-brown). [5] The keel is tall and colorless, and inserts between the last and penultimate shell whorls in animals larger than 1.5 mm. [5] The spire is tall and conical, consisting of 4 whorls and possessing a complex pattern of spiral sculpture that ends on the protoconch and is replaced by spiral rows of small punctae on the teleoconch. [5] Coloration ranges from brown to amber and reddish brown. [5]
Juveniles of this species are easily recognised by their shape and ornament. [1] The protoconch is rather high conical and has 3½ - 3¾ whorls, slowly increasing in diameter. [1] On the first whorl, in front of the nucleus, an ornament is seen of some nine or ten irregular spirals. [1] Two stronger spirals from the second whorl on delimit a subsutural zone and the base of the shell. [1] On these spirals the whorl profile is slightly angular. [1] The whole surface of the protoconch is furthermore covered with numerous finer spirals in an irregular zigzag shape, also on the base and within the umbilicus. [1] The boundary with the teleoconch is made distinct by the sudden disappearance of these spirals. [1] From that point on the whorl diameter increases rapidly, by which the shape of the shell becomes lenticular. [1] Somewhat more than one teleoconch whorl is present in the largest specimens. [1] The periphery of the body whorl is angular and bears a distinct flange-like keel. [1] The protoconch is visible in an apertural view. [1]
Eyes aretype a, operculum is type a, and radula type I. [5]
Description overview:
Atlanta brunnea has an almost worldwide tropical and subtropical distribution pattern. [1]
Atlanta brunnea is known from the Pliocene of Anda, Pangasinan, Luzon, Philippines. [1]
It is limited to the upper 100 m of the water column in Hawaiian waters. [5] Comparison of day and night vertical distribution of abundances suggested that a portion of the population from 50 to 100 m migrated into the upper 50 m at night. [5]
This article incorporates CC-BY-3.0 text from references. [1] [5]