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THE ISLAND OCTOPUS BLOG

Shell Feature: Apple Murex

1/31/2025

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Apple Murex Shells
Apple murex shells are large sea snails found in Florida. They feature lacy vertical stripes and ridges and one large round opening. This is a fairly common find on Southwest Florida beaches, and often when I find one, I find many of them. The apple murex is one of 6 murex species found here.
Scientific name of the Apple Murex: Phyllonotus pomum
Coloring: brown and white stripes, sometimes featuring pink, orange, purple and reddish-brown hues.
Size: up to about 5 inches
​Apple murex live in coral reefs, mangroves, shell beds, rock and sand. They are carnivorous gastropods, drilling holes in bivalves.


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Shell Feature: Florida Horse Conch

11/30/2024

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Florida horse conch shells
The Florida horse conch, also know as the giant horse conch, is the largest snail in the United States. They are the state shell of Florida. Horse conchs contain a large opening which has been used as a drinking vessel and for holding other liquids in the past. They are known for their pronounced spiral tips and are popular with shell hunters and collectors alike. Due to the juveniles bright colors, they are easier to spot amongst other shells as they roll in with the tide. These shells can be found around the beaches of Sanibel and other local barrier islands.
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Scientific name of the Florida Horse Conch: Triplofusus giganteus
Coloring: adults range from off white, tan to dark brown while juveniles may be vivid colors ranging from yellow, golden and bright orange.
Size: up to about 24 inches long. The juveniles in the photo are under one inch in length.
Florida horse conchs are found along the coasts of the North Carolina down to the Yucatán in the Gulf of Mexico.
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Shell Feature: Worm Shell

8/15/2024

 
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The somewhat bizarre worm shells feature a swirly spiral shaped hollow tube. These shells are made from two related species: the Fargo Worm Snail and the Florida Worm Snail. These snails start making a tightly coiled shell until it's about half an inch to an inch long. Then, the length of the shell becomes uncoiled, changing into this loose swirly spiral shape. This shape allows the Worm Snail to anchor itself to sponges, rocks and corals. It's fairly common to find broken pieces of this shell on Sanibel beaches (like the photo above), and occasionally you can find one with the tightly coiled pointy shell top!
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Scientific name of the Florida Worm Snail: Vermicularia knorrii
Scientific name of the Fargo Worm Snail: Vermicularia fargoi
Coloring: white, tan or light brown
Worm Snails are sea snails that live in coastal reefs. They are suspension feeders that trap plankton for food.

Shell Feature: Banded Tulip

5/28/2024

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banded tulip shell
The smooth, swirly banded tulip shells have an elegant spiral shape that resembles a tie-dyed tulip flower. You can find a variety of sizes, with a maximum size of about 4 inches. The banded tulip is a common shell in Southwest Florida and is also found in other areas of the Gulf of Mexico, eastern Florida, and northern Caribbean Sea.

Scientific name of the banded tulip: Cinctura lilium
Tulips are predatory sea snails, feeding on other smaller mollusks.
Coloring: gray, purple, pink, blue, orange and white with dark brown bands.
Size: up to 4 inches
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Find banded tulips in Southwest Florida and the Gulf of Mexico, eastern Florida and the northern Caribbean Sea. It typically lives on sand between 2 and 150 feet deep. Frequently found on Sanibel Island, you can often find these pretty shells washed ashore, or live snails in or near tide pools.
-Melissa
banded tulip shells
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Shell Feature: Olives

3/16/2024

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olive shells
The glossy, smooth, marble-like olive shells have a distinctive oval-shape with a conical top. You can find a variety of sizes, with a maximum size of about 3.5 inches. The most common olive shells in Southwest Florida are the lettered olive, which are cream or tan colored with brownish v-shaped "lettering". I have also found all-cream colored shells, and recently a dark-gray colored one.

Scientific name of the lettered olive: Oliva sayana
Olives are predatory sea snails, a marine gastropod mollusk in the family Olivdae.
Coloring: tan, white, cream, brownish, gray
Size: up to 3.5 inches
Find lettered olives from North Carolina to Florida, Louisiana to Texas and south through the east coast of Mexico. It typically lives in near-shore waters, on shallow sand flats near inlets. The shells frequently wash ashore on Sanibel and Fort Myers Beach.

​-Melissa

olive seashells
lettered olive shells
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March News

3/4/2024

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Our events this month include the Sanibel Shell Festival, the Sanibel Community House Arts & Crafts Fair, and a shamrock craft project at Sanibel Public Library. Learn more on our local event page.

On Patreon this month, we will be releasing some digital coloring pages from our 2 upcoming coloring books. We will also be releasing a new sticker design and discussing several art projects this month. 

Photo above:  a Junonia shell watercolor collage created by Melissa this week!
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Shell Feature: Calico Scallop

1/25/2024

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The Atlantic Calico Scallop is one of my favorite shells found in Southwest Florida. It features a lovely "calico" patchwork pattern of pink, red and white. The photo above includes some of our favorites we've found on the beach. They are very plentiful on Sanibel Island, and easy to spot since they are so bright.

Scientific name: Argopecten gibbus
Calico scallops are bivalve (two-shells) molluscs
Coloring: patterns of pink, purple and white (and sometimes orange and grey)
Size: up to 3 inches
Where to find: coastal waters from Maryland to Florida, throughout the Gulf of Mexico and the Caribbean Sea, and down to Brazil. 
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-Melissa
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October News

10/4/2023

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Our October events this month include the Wednesday Night Market at Alliance for the Arts, a candy corn craft project at Sanibel Public Library, Fall Festival at Edison Ford Winter Estates, and the Sanibel Community House Arts & Crafts Fair! Learn more on our local event page.

On Patreon this month, we will be releasing our next digital zine! This one will be themed Halloween Nights. 

On Instagram, Melissa is releasing new art/sketches for the 2023 Drawtober art challenge.

Photo above:  a very stylish shell we found a few months ago
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The Banded Tulip Shell

8/10/2022

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Banded Tulip at Blind Pass, Sanibel Island 2022

Banded Tulip shells (Cinctura hunteria) are commonly found along the barrier islands of Southwest Florida. They can also be found in other areas along the Gulf of Mexico, the Florida Keys and throughout the Caribbean Sea.

The organisms responsible for the creation of these shells are a type of mollusk, more commonly known as aquatic snails. These mollusks are epifaunal carnivores, meaning they live most of their lives attached to hard surfaces beneath the ocean waves. They hunt for smaller prey on coral reefs and other rocky surfaces. These beautiful shells can grow as large as 4 inches or more.
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Banded Tulip original art by Melissa (water color, pencil, collage) 2022

The Cinctura genus contains 5 known species of Tulip. This genus is a member of the Fasciolariidae family, which also contains what is known as the true tulip shell (Fasciolaria tulipa). The Fasciolariidae family, also known as the tulip and spindle snails family, is thought to have first appeared during the Cretaceous period. Today’s species inhabit warm tropical and temperate waters.

We have found Banded Tulip shells twice on Sanibel Island, once at Gulfside City Beach and the other recently at Blind Pass. Banded Tulips prefer intertidal sand flats, especially in quiet lagoon water. Their diets consist mainly of other mollusks, which they hunt amongst beds of sea grass.
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Banded Tulip found at Gulf Side Beach, Sanibel Island 2022

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