Megasurcula

Last updated

Megasurcula
Megasurcula carpenteriana.jpg
A live individual of Megasurcula carpenteriana on the sea bed
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Conoidea
Family: Pseudomelatomidae
Genus: Megasurcula
Casey, 1904 [1]
Type species
Pleurotoma (Surcula) carpenterianaGabb, 1865
Species

See text

Megasurcula is a genus of medium-sized predatory sea snails, marine gastropod molluscs in the family Pseudomelatomidae, a family previously lumped with others collectively known as turrids. [2] Species within this genus occur in the Eastern Pacific Ocean [3]

Contents

Description

(Original description) The embryo in this genus is apparently paucispiral, but conoidal. The siphonal canal is obsolete. The base of the shell is broadly obtuse. The columella shows an oblique ridge externally. The sinus is large and broadly rounded and very near the suture. The fasciolar surface below the suture is broad and feebly concave. The periphery is obtuse and not very prominent. The suture is simple, without a subjacent elevated collar. The surface is rendered somewhat rough by relatively fine, close-set and irregular spiral lines. There is no longitudinal sculpture except lines of growth.

The species are large and ponderous, and include Megasurcula carpenteriana (Gabb, 1865) and Surcula tryoniGabb 1865, from the coast of California.

Megasurcula is a widely isolated and strongly characterized genus, belonging exclusively to the living fauna of the Pacific coast of North America as far as known at present. It is, at the same time, a rather direct descendant of the extinct Bathytoma, but the species are of far larger size, carpenteriana being probably the largest or most ponderous Pleurotomid known. The embryo, which is conoidal and multispiral in Bathytoma, has gradually lost some of its whorls, as shown in Megasurcula, which of itself would not be a generic character, but there is in Bathytoma a broad constriction of the body whorl below the convexity, forming a short stout beak, which is wholly unobservable in Megasurcula, and the aperture is much more capacious in the latter, with the anal sinus much larger and different in form and position. [4]

Species

Species within the genus Megasurcula include:

Species brought into synonymy

Related Research Articles

<span class="mw-page-title-main">Turrid</span> Common name for many species of snail

Turrid, plural turrids, is a common name for a very large group of predatory sea snails, marine gastropod mollusks which until recently were all classified in the family Turridae. However, recently the family was discovered to be polyphyletic and therefore was split into a number of families.

<i>Crassispira</i> Genus of gastropods

Crassispira is a genus of small predatory sea snails with narrow, high-spired shells, marine gastropod mollusks in the family Pseudomelatomidae.

<span class="mw-page-title-main">Pseudomelatomidae</span> Family of gastropods

Pseudomelatomidae is a family of predatory sea snails, marine gastropods included in the superfamily Conoidea and part of the Neogastropoda.

<i>Megasurcula carpenteriana</i> Species of gastropod

Megasurcula carpenteriana, also known as Carpenter's turrid, is a species of medium-sized predatory sea snail, a marine gastropod mollusc in the family Pseudomelatomidae, a family previously lumped with others collectively known as turrids. This species occurs in the Eastern Pacific Ocean. The species was named in honor of Philip Pearsall Carpenter.

<i>Megasurcula tremperiana</i> Species of gastropod

Megasurcula tremperiana is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

<i>Brachytoma</i> Genus of gastropods

Brachytoma is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae.

<i>Cymatosyrinx</i> Genus of gastropods

Cymatosyrinx is a genus of sea snails, marine gastropod mollusks in the family Drilliidae.

<i>Bathytoma</i> Genus of gastropods

Bathytoma is a genus of deep-water sea snails, marine gastropod mollusks in the family Borsoniidae.

Monilispira is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae, the turrids and allies.

<i>Antiplanes</i> Genus of gastropods

Antiplanes is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae,.

<i>Knefastia</i> Genus of gastropods

Knefastia is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae.

<span class="mw-page-title-main">Borsoniidae</span> Family of sea snails

Borsoniidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.

<i>Turbonilla</i> Genus of gastropods

Turbonilla is a large genus of ectoparasitic sea snails, marine gastropod molluscs in the family Pyramidellidae, the pyrams and their allies.

<span class="mw-page-title-main">Mitromorphidae</span> Family of gastropods

Mitromorphidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.

<i>Pseudorhaphitoma</i> Genus of gastropods

Pseudorhaphitoma is a genus of sea snails, marine gastropod mollusks in the family Mangeliidae.

<i>Vitrinella</i> Genus of gastropods

Vitrinella is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Vitrinellidae.

<i>Megasurcula stearnsiana</i> Species of gastropod

Megasurcula stearnsiana is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

<i>Cyclostremiscus</i> Genus of gastropods

Cyclostremiscus is a genus of small sea snails in the family Tornidae.

<i>Solariorbis</i> Genus of gastropods

Solariorbis is a genus of gastropods belonging to the family Tornidae.

References

  1. ↑ Casey, Thos. L. (1904). "Notes on the Pleurotomidae with Description of Some New Genera and Species". Transactions of the Academy of Science of St. Louis . 14: 123 at 147–148.
  2. ↑ Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN   3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
  3. ↑ MolluscaBase (2020). MolluscaBase. Megasurcula T. L. Casey, 1904. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=432503 on 2020-01-25
  4. ↑ Casey T.L. (1904) Notes on the Pleurotomidae with description of some new genera and species. Transactions of the Academy of Science of St. Louis, 14, 123–170
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.