Borsonella merriami

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Borsonella merriami
Borsonella merriami 001.jpg
Original drawing of a shell of Borsonella merriami
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Borsoniidae
Genus: Borsonella
Species:
B. merriami
Binomial name
Borsonella merriami
(Arnold, 1903)
Synonyms [1]

† Drillia merriamiArnold, 1903 (original combination)

Contents

Borsonella merriami is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae. [1]

Description

(Original description) The small, fusiform shell is rather thin. The apex is blunt. The seven whorls are somewhat angular, with about fourteen slightly oblique, prominent, rather sharp transverse ridges. These ridges are most prominent on the angle of the whorl, and become obsolete near the anterior margin and at about one-third width of the whorl from the posterior margin. A narrow sutural band occupies the upper one third of the whorl. Incremental lines are visible. The suture is deeply impressed and distinct. The body whorl is somewhat ventricose and narrowed anteriorly, with transverse ribs sometimes obsolete. The aperture is broadly elliptical, narrowed anteriorly to a prominent sinus. The posterior sinus is small, near the suture. The thin outer lip is arcuate. The columella is smooth.

Dimensions: Length. 14.2 mm.; width: 5.2 mm.; body whorl 7.6 mm.; aperture, including siphonal canal, 6 mm.; siphonal canal 1.5 mm. [2]

Distribution

This fossil species is rare in Pliocene and lower San Pedro series of Deadman Island. The specimen figured is the type, which is from the lower San Pedro series at Deadman Island (California).

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References

  1. 1 2 Bouchet, P. (2015). Borsonella merriami (Arnold, 1903). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=849189 on 2016-02-26
  2. ↑ Arnold (1903), The Paleontology and Stratigraphy of San Pedro; Memoirs of the California Academy of Sciences, 1903, 3; p. 207 (described as Drillia merriami)
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