Tag: coastal habitat

Cocoa Beach’s Unique Nine-Armed Sea Star Encounter

In Cocoa Beach, I encountered a Nine-armed Sea Star, which I returned to the ocean, reflecting on its ecological role and the wonders of marine life.

MichaelStephenWills11 Comments

Walking along the shoreline of Cocoa Beach in the early morning light, I encountered a remarkable sight—a Nine-armed Sea Star (Luidia senegalensis) sprawled on the damp sand. Its long, slender arms stretched outward in a perfect starburst pattern, each limb tapering to a fine point. The sandy beige coloration of its body blended with the surrounding beach, accentuated by a darker stripe running down the center of each arm. Scattered around it were small shells and fragments, remnants of the ocean’s ebb and flow, testifying to the high tide that had deposited this fascinating creature ashore.

The scientific name Luidia senegalensis provides insight into the taxonomy and classification of this intriguing sea star. The genus Luidia is named after the 18th-century Portuguese naturalist Francisco Luid, who contributed significantly to marine biology. The species name senegalensis refers to its first recorded discovery along the coast of Senegal in West Africa. As a member of the phylum Echinodermata and the class Asteroidea, the Nine-armed Sea Star shares lineage with other starfish, sea urchins, and sand dollars, distinguished by their radial symmetry and water vascular system used for movement and feeding.

As I paused to observe it more closely, I marveled at the intricate details of its structure. Unlike the more familiar five-armed sea stars, this specimen had nine arms radiating from a small central disc. The surface of its body appeared smooth, with tiny tube feet lining the underside of each arm—a biological marvel designed for locomotion and feeding.

This starfish washed up on high tide. I seemed alive so I returned it to the surf during ebb tide, hoping the ebb current would return it to deeper water.

The Nine-armed Sea Star, common along Florida’s coastline, is a voracious predator within the benthic ecosystem. It primarily preys on bivalves such as clams and mussels, using a fascinating feeding strategy. Unlike most predators that rely on speed and strength, this sea star employs patience and ingenuity. It wraps its flexible arms around a bivalve, exerting a slow and steady force to pry the shell open. Once a small gap is achieved, the sea star everts its stomach through its mouth and into the prey’s shell, secreting digestive enzymes that liquefy the soft tissues within. This external digestion allows the sea star to consume its prey without the need for teeth or jaws—a perfect example of nature’s ingenuity.

Despite its delicate appearance, the Nine-armed Sea Star plays a crucial role in the marine ecosystem. By preying on bivalves, it helps regulate their populations, preventing overgrazing of seagrass beds and maintaining a balanced food web. Additionally, it serves as a food source for larger marine predators, such as fish and sea turtles. Its presence signifies a healthy intertidal environment, where nutrient cycles and predator-prey relationships are in dynamic equilibrium.

As I considered the sea star’s role in the ecosystem, I wondered about its journey to this point. These creatures undergo a fascinating life cycle, starting as tiny, free-swimming larvae that drift with ocean currents. Over time, they undergo metamorphosis, settling onto the seabed and gradually developing into their iconic star shape. The resilience and adaptability of these creatures are truly astounding, capable of regenerating lost arms and thriving in diverse habitats.

Realizing that this sea star likely found itself stranded by the receding high tide, I felt a sense of responsibility to help it return to its natural environment. Picking it up gently, I carried it toward the water’s edge, where the ebb tide was beginning to pull the sea back into its vast domain. With a final look at its striking form, I placed it carefully into the shallow waves, hoping that the ebb current would carry it back to the sandy seabed where it belonged.

As the waves lapped around my feet, I imagined the sea star resuming its journey, gliding along the ocean floor in search of its next meal. The interconnectedness of all marine life became evident in that moment—each creature playing its part in an intricate and delicate dance of survival.

Walking back along the shoreline, I reflected on the experience. My fleeting encounter with the Nine-armed Sea Star was a reminder of the wonders hidden beneath the ocean’s surface and our role in preserving them. Every tide brings new discoveries, and every ebb offers a second chance—for the sea star, and perhaps for us as well.

Cocoa Beach, with its gentle waves and abundant life, had once again provided an unforgettable encounter with nature. The starfish, now safely returned to the ocean, would continue its unseen work beneath the waves, a quiet but essential denizen of the underwater world.

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Beachcombing on Cocoa Beach: A Moon Snail Encounter

Join me in reliving the enchanting evening on Cocoa Beach where my wife and I discovered a rare, intact Atrina rigida shell. Dive into the world of this fascinating bivalve through our story of ecological wonder and natural beauty.

MichaelStephenWills8 Comments

 

The first light of dawn painted the horizon in soft hues of pink and orange as I strolled along Cocoa Beach, Brevard County, Florida, the heart of the Space Coast. It was winter 2017, and the cool breeze carried the salty scent of the ocean. My eyes scanned the sand for treasures, remnants of the ocean’s bounty washed ashore by the relentless rhythm of the tides.

The beach was a mosaic of shells, fragments of marine life that had completed their journey. Among them, a particular shell caught my eye – the Moon Snail or Necklace Shell, scientific name Naticidae, known for its smooth, spiraled form and glossy finish. The shell I found that morning was bathed in the early light, its curves reflecting the phases of the moon, hinting at the mysteries of the ocean from which it came.

The scientific name of the Moon Snail, belonging to the family Naticidae, finds its roots in the rich tapestry of classical languages, reflecting the distinct characteristics and historical context of these marine gastropods. The family name, Naticidae, is derived from the genus Natica, which in turn originates from the Latin word “naticula,” meaning “a little buttock.” This whimsical etymology is thought to describe the round, smooth, and somewhat globular shape of the Moon Snail’s shell, which can resemble a small, rounded form akin to a buttock.

The genus Natica was first described by the French naturalist Jean-Baptiste Lamarck in the early 19th century. The suffix “-idae” is a common ending used in zoological nomenclature to indicate a family level in taxonomy. Moon Snails are known for their distinctive appearance, with large, rounded shells that often have a glossy surface and intricate patterns. The family’s name not only captures the physical traits of these snails but also highlights the historical practice of using descriptive and sometimes playful terms in the classification of organisms.

As I admired the shell, memories of previous beachcombing adventures flooded back. The Moon Snail’s elegant design has always fascinated me, symbolizing both beauty and predation. The shell’s form, with its deep umbilicus and polished surface, is a testament to the life it once harbored.

 

Shell of the Moon Snail (Naticidae) found in the surf wash. Cocoa Beach, Brevard County, Florida

 

This winter past, January 2024, I enjoyed a rare sight – a live Moon Snail washed up on the shore. The small, compact form was nestled in the sand, its body partially retracted into its shell. I carefully picked it up gently. The snail’s soft, pale brown body contrasted with the hard, glossy shell, a perfect example of nature’s duality.

Observing the snail closely, I could see its large foot, a muscular organ that it uses for locomotion and burrowing into the sand. The foot’s underside, called the sole, was slightly sticky, aiding in its movement. The snail’s head, with its small, retractable tentacles, peeked out cautiously. These tentacles are equipped with sensory organs, allowing the snail to explore its surroundings and detect prey.

Moon Snails are predatory creatures, and their diet consists mainly of other mollusks. The snail’s mantle, a fleshy part of its body, secretes the shell and also houses the snail’s siphon. The siphon is used for breathing and detecting chemical signals in the water, crucial for hunting. The snail’s radula, a toothed, tongue-like organ, is a formidable tool for drilling into the shells of its prey. The Moon Snail wraps its large foot around its victim, creating an acidic environment that helps it bore a hole into the shell. This process can take several hours, after which the snail consumes the soft tissue inside.

Can you spot the work of the Moon Snail on these waves washed shells? Cocoa Beach, Brevard County, Florida

Aware of the snail’s delicate nature, I decided to return it to the surf. I tossed the creature far into the surf. It was a small act of conservation, a gesture to ensure that this remarkable creature could continue its journey.

Reflecting on the encounter, I felt a deep connection to the natural world. Beachcombing is not just about collecting shells; it’s about understanding the lives they represent and the intricate ecosystems they are part of. Each shell tells a story of survival, adaptation, and the relentless cycle of life and death in the ocean.

Cocoa Beach, with its endless horizon and rhythmic waves, is a sanctuary for these stories. The Space Coast, known for its technological achievements and space exploration, also offers a window into the ancient, natural world that thrives beneath the waves. The juxtaposition of human advancement and natural beauty is striking, reminding us of our place in the larger tapestry of life.

As I left the beach that January 2024 morning, the sun climbing higher in the sky, I carried a renewed appreciation for the ocean’s wonders. The delicate balance of predator and prey, the seamless integration of form and function, and the ongoing dance of life – all captured in the spiral of a Moon Snail shell.

 

Copyright 2024 Michael Stephen Wills All Rights Reserved

A Complete Atrina rigida found on Cocoa Beach

Join me in reliving the enchanting evening on Cocoa Beach where my wife and I discovered a rare, intact Atrina rigida shell. Dive into the world of this fascinating bivalve through our story of ecological wonder and natural beauty.

MichaelStephenWills6 Comments

 

Introduction


One evening, as the sun dipped below the horizon, my wife Pam and I walked along the Cocoa Beach shore. There, among the relics of the receding high tide, I found a complete shell, a rare occurrence where often only fragments are discovered. This intact specimen was a rigid pen shell, scientifically known as Atrina rigida, its 6-inch length and 4-inch width a testament to its resilience in the face of the ocean’s might.

 

A Rigid Pen Shell (Atrina rigida). These bivalves are found in sandy or muddy substrates in shallow waters and are characterized by their triangular shape and distinctive long, pointed end. This specimen is about 6 inches long, 4 inches wide.

 

Etymology and Common Name


The scientific name ‘Atrina rigida’ is steeped in Latin origins, with ‘atrium’ suggesting a ‘hall’ and ‘rigidus’ denoting ‘stiff.’ This nomenclature reflects the shell’s hardy structure, reminiscent of a grand hall’s architecture, standing firm against the elements. The common name “Pen Shell” draws from the shell’s elongated, pen-like appearance when it stands vertically in the sand, resembling antique writing quills used in centuries past.

 

Ecology and Habitat


“The rigid pen mollusk burrows as it grows, but the wide posterior end of the shell always remains exposed so water from above the seafloor can be drawn through the inhalant chamber of the mantle cavity. Typical of bivalves, water is drawn over gills or ctenidium by the beating of cilia where oxygen from the water is absorbed. Suspended food and other water-borne nutrients also become trapped in mucus, which is then transported to the mouth, digested and expelled as feces. Unique gutter-like waste canals in the viscera of the inhalant chamber also help to keep gills and other organs clear from silt and other unwanted water-borne particles by expelling these as pseudofeces. Its anterior end is typically buried in fine substrate and attached by byssal threads, with its wider posterior gaping end extending just above the sea bottom surface to facilitate filter-feeding. Algae (e.g. Lobophora variegata) and invertebrates such as sponges and encrusting corals tend to grow on the exposed part of the shell and may camouflage it very well.” [1]

 

Rarity of a Whole Pen Shell


Typically, one finds only broken shards of these shells, the complete forms often victims to the ocean’s relentless energy or human activity. The intact shell I found lying atop the sand was therefore a unique and precious find, its wholeness mirroring the unbroken evening calm.

 

The Beauty of Nacre and Sea Silk


Look inside a rigid pen shell to find a hidden treasure: the nacre, or mother-of-pearl, lining the interior. This lustrous, iridescent layer is typically found on the inner surface, a stark contrast to the rough exterior. The nacre’s smooth, reflective quality has made pen shells a source of ornamentation throughout history, their beauty extracted from the depths to adorn human creations.

“Sea silk is an extremely fine, rare, and valuable fabric that is made from the long silky filaments or byssus secreted by a gland in the foot of pen shells (in particular Pinna nobilis). The byssus is used by the clam to attach itself to the seabed.

Sea silk was produced in the Mediterranean region from the large marine bivalve mollusk Pinna nobilis until early in the 20th century. The animal, whose shell is sometimes almost a metre long, adheres itself pointed end down to rocks in the intertidal zone using a tuft of very strong thin fibres. These byssi or filaments (which can be six centimeters long) are spun and, when treated with lemon juice, turn a golden color, which never fades.

The cloth produced from these filaments can be woven even more finely than silk, and is extremely light and warm; it was said that a pair of women’s gloves made from the fabric could fit into half a walnut shell and a pair of stockings in a snuffbox. The cloth attracts clothes moths, the larvae of which will eat it.

Pinna nobilis is also sometimes gathered for its edible flesh and occasional pearls of fair quality.” [2]

 

Location and Personal Impact


Our discovery on Cocoa Beach, a location known for its diverse marine life, added to the sense of connection with the natural world. The shell’s journey to rest upon the sand, whole and unblemished, felt like a shared secret between the ocean and us, a fleeting glimpse into the life of a creature whose home is often hidden beneath the waves.

 

Conservation and Reflection


This encounter with a complete Atrina rigida emphasizes the importance of marine conservation and protecting such fragile ecosystems. It serves as a poignant reminder of our responsibility to the environment and the need for collective action to preserve the ocean’s myriad inhabitants.

 

Conclusion


Finding a whole rigid pen shell amidst our peaceful walk was an extraordinary event that transcended mere chance. It provided a moment of awe, an opportunity to marvel at the elegance of nature’s design, and a reminder of the delicate balance that exists within our planet’s ecosystems. This intact Atrina rigida from Cocoa Beach will forever symbolize the enduring beauty and complexity of the marine world.

References
  1. Wikipedia articles for “Atrina rigida,”
  2. and “Sea Silk.”

 

Copyright 2024 Michael Stephen Wills All Rights Reserved