Aliger gigas

The queen conch was originally described from a shell in 1758 by Swedish naturalist and taxonomist Carl Linnaeus, who originated the system of binomial nomenclature.[4] Linnaeus named the species Strombus gigas, which remained the accepted name for over 200 years. Linnaeus did not mention a specific locality for this species, giving only "America" as the type locality.[14] The specific name is the ancient Greek word gigas (γίγας), which means "giant", referring to the large size of this snail compared with almost all other gastropod molluscs.[15] Strombus lucifer, which was considered to be a synonym much later, was also described by Linnaeus in Systema Naturae.[4]

In the first half of the 20th century, the type material for the species was thought to have been lost; in other words, the shell on which Linnaeus based his original description and which would very likely have been in his own collection, was apparently missing, which created a problem for taxonomists. To remedy this, in 1941 a neotype of this species was designated by the American malacologists William J. Clench and R. Tucker Abbott. In this case, the neotype was not an actual shell or whole specimen, but a figure from a 1684 book Recreatio mentis, et occuli, published 23 years before Linnaeus was born by the Italian Jesuit scholar Filippo Buonanni (1638–1723). This was the first book that was solely about seashells.[14][16][17][18] In 1953 the Swedish malacologist Nils Hjalmar Odhner searched the Linnaean Collection at Uppsala University and discovered the missing type shell, thereby invalidating Clench and Abbott's neotype designation.[19]

Strombidae's taxonomy was extensively revised in the 2000s and a few subgenera, including Eustrombus, were elevated to genus level by some authors.[20][21][22] Petuch[5] and Petuch and Roberts[23] recombined this species as Eustrombus gigas, and Landau and collaborators (2008) recombined it as Lobatus gigas.[22] In 2020, it was recombined as Aliger gigas by Maxwell and colleagues,[24] which is the current valid name according to the World Register of Marine Species.[25]

The phylogenetic relationships among the Strombidae were mainly studied by Simone (2005)[20] and Latiolais (2006),[21] using two distinct methods. Simone proposed a cladogram (a tree of descent) based on an extensive morpho-anatomical analysis of representatives of Aporrhaidae, Strombidae, Xenophoridae and Struthiolariidae, which included A. gigas (there referred to as Eustrombus gigas).[20]

With the exception of Lambis and Terebellum, the remaining taxa were previously allocated in the genus Strombus, including A. gigas. However, according to Simone, only Strombus gracilior, Strombus alatus and Strombus pugilis, the type species, remained within Strombus, as they constituted a distinct group based on at least five synapomorphies (traits that are shared by two or more taxa and their most recent common ancestor).[20] The remaining taxa were previously considered subgenera and were elevated to genus level by Simone. Genus Eustrombus (now considered a synonym of Lobatus[26]), in this case, included Eustrombus gigas (now considered a synonym of Aliger gigas) and Eustrombus goliath (= Lobatus goliath), which were thus considered closely related.[20]

In a different approach, Latiolais and colleagues (2006) proposed another cladogram that attempts to show the phylogenetic relationships of 34 species within the family Strombidae. The authors analysed 31 Strombus species, including Aliger gigas (there referred to as Strombus gigas), and three species in the allied genus Lambis. The cladogram was based on DNA sequences of both nuclear histone H3 and mitochondrial cytochrome-c oxidase I (COI) protein-coding gene regions. In this proposed phylogeny, Strombus gigas and Strombus gallus (= Lobatus gallus) are closely related and appear to share a common ancestor.[21]

Common names include "queen conch" and "pink conch" in English, caracol rosa and caracol rosado in Mexico, caracol de pala, cobo, botuto and guarura in Venezuela, caracol reina, lambí in the Dominican Republic and Grenada,[27][28][29][30][31] and carrucho in Puerto Rico.[32]

Five different views of an adult shell of A. gigas: abapertural (upper left), lateral (center), apertural (upper right), apical (lower left) and basal (lower right). Note: The lip of this shell has been filed down or cut down artificially, a common practice in the shell trade.

An adult queen conch shell with the lip completely intact

Abapertural (left) and apertural (right) views of a beachworn and slightly bleached-out juvenile shell of A. gigas

Aliger gigas fossil from the Pleistocene (Eemian) of Great Inagua, the Bahamas.

The mature shell grows to 15–31 centimetres (5.9–12.2 in) in length in three to five years[33][34] while the maximum reported size is 35.2 centimetres (13.9 in). However, even though they only grow to be this maximum length, the thickness of the shell is constantly increasing.[3][18][35] The shell is very solid and heavy, with 9 to 11 whorls and a widely flaring and thickened outer lip. The thickness is highly important because the thicker the shell, the better protected it is. Additionally, instead of increasing in size once it reaches its maximum, the outside shell thickens as time goes on- an important indicator of how old the queen conch is.[11] Although this notch is not as well developed as elsewhere in the family,[18] the shell feature is nonetheless visible in an adult dextral (normal right-handed) specimen, as a secondary anterior indentation in the lip, to the right of the siphonal canal (viewed ventrally). The animal's left eyestalk protrudes through this notch.[18][32][36][37]

The spire is a protruding part of the shell that includes all of the whorls except the largest and final whorl (known as the body whorl). It is usually more elongated than in other strombid snails, such as the closely related and larger goliath conch, Lobatus goliath that is endemic to Brazil.[18] In A. gigas, the glossy finish or glaze around the aperture of the adult shell is primarily in pale shades of pink. It may show a cream, peach or yellow colouration, but it can also sometimes be tinged with a deep magenta, shading almost to red. The periostracum, a layer of protein (conchiolin) that is the outermost part of the shell surface, is thin and a pale brown or tan colour.[34][36][37]

The overall shell morphology of A. gigas is not solely determined by the animal's genes; environmental conditions such as location, diet, temperature and depth, and biological interactions such as predation, can greatly affect it.[38][39] Juvenile conches develop heavier shells when exposed to predators. Conches also develop wider and thicker shells with fewer but longer spines in deeper water.[39]

The shells of juvenile queen conches are strikingly different in appearance from those of the adults. Noticeable is the complete absence of a flared outer lip; juvenile shells have a simple sharp lip, which gives the shell a conical or biconic outline. In Florida, juvenile queen conches are known as "rollers", because wave action very easily rolls their shells, whereas it is nearly impossible to roll an adult specimen, due to its shell's weight and asymmetric profile. Subadult shells have a thin flared lip that continues to increase in thickness until death.[40][41][42]

Conch shells are about 95% calcium carbonate and 5% organic matter.[43]

Index Testarum Conchyliorum (published in 1742 by the Italian physician and malacologist Niccolò Gualtieri) contains three illustrations of adult shells from different perspectives. The knobbed spire and the flaring outer lip, with its somewhat wing-like contour expanding out from the last whorl, is a striking feature of these images. The shells are shown as if balancing on the edge of the lip and/or the apex; this was presumably done for artistic reasons as these shells cannot balance like this.

One of the most prized shell publications of the 19th century, a series of books titled Illustrations conchyliologiques ou description et figures de toutes les coquilles connues, vivantes et fossiles (published by the French naturalist Jean-Charles Chenu from 1842 to 1853), contains illustrations of both adult and juvenile A. gigas shells and one uncoloured drawing depicting some of the animal's soft parts.[44] Almost forty years later, a colored illustration from the Manual of Conchology (published in 1885 by the American malacologist George Washington Tryon) shows a dorsal view of a small juvenile shell with its typical brown and white patterning.[42]

Adult shell, apical view, Gualtieri, 1742

Adult shell, ventral view, Gualtieri, 1742

Adult shell, dorsal view, Gualtieri, 1742

Juvenile shell, Tryon, 1885

The foot (with a brown, sickle-shaped operculum), eyestalks and snout of Aliger gigas exposed through the shell's aperture. At the tip of each eyestalk there is a well-developed eye. Near the tip is a small sensory tentacle.

Many details about the anatomy of Aliger gigas were not well known until Colin Little's 1965 general study.[45] In 2005, R. L. Simone gave a detailed anatomical description.[20] A. gigas has a long extensible snout with two eyestalks (also known as ommatophores) that originate from its base. The tip of each eyestalk contains a large, well-developed lensed eye, with a black pupil and a yellow iris and a small, slightly posterior sensory tentacle.[18][33] Amputated eyes completely regenerate.[46] Inside the mouth of the animal is a radula (a tough ribbon covered in rows of microscopic teeth) of the taenioglossan type.[45] Both the snout and the eyestalks show dark spotting in the exposed areas. The mantle is darkly coloured in the anterior region, fading to light gray at the posterior end, while the mantle collar is commonly orange. The siphon is also orange or yellow.[45] When the soft parts of the animal are removed from the shell, several organs are distinguishable externally, including the kidney, the nephiridial gland, the pericardium, the genital glands, stomach, style sac and the digestive gland. In adult males, the penis is also visible.[45]

A drawing of an adult male Aliger gigas (from Duclos in Chenu, 1844) showing the external soft parts including the spade-shaped penis on the left. Separate details show the mouth, the distal portion of the penis, and both sides of the claw-like operculum

The species has a large and powerful foot with brown spots and markings towards the edge, but is white nearer to the visceral hump that stays inside the shell and accommodates internal organs. The base of the anterior end of the foot has a distinct groove, which contains the opening of the pedal gland. Attached to the posterior end of the foot for about one third of its length is the dark brown, corneous, sickle-shaped operculum, which is reinforced by a distinct central rib. The base of the posterior two-thirds of the animal's foot is rounded; only the anterior third touches the ground during locomotion.[20][45] The columella, the central pillar within the shell, serves as the attachment point for the white columellar muscle. Contraction of this strong muscle allows the animal's soft parts to shelter in the shell in response to undesirable stimuli.[45]

Aliger gigas has an unusual means of locomotion, first described in 1922 by George Howard Parker (1864–1955).[47][48] The animal first fixes the posterior end of the foot by thrusting the point of the sickle-shaped operculum into the substrate, then it extends the foot in a forward direction, lifting and throwing the shell forward in a so-called leaping motion. This way of moving is considered to resemble that of pole vaulting,[49] making A. gigas a good climber even of vertical concrete surfaces.[50] This leaping locomotion may help prevent predators from following the snail's chemical traces, which would otherwise leave a continuous trail on the substrate.[51]

Aliger gigas is native to the tropical Western Atlantic coasts of North and Central America in the greater Caribbean tropical zone.[37] Although the species undoubtedly occurs in other places, this species has been recorded within the scientific literature as occurring, in:[3][60][61] Aruba, (Netherlands Antilles); Barbados; the Bahamas; Belize; Bermuda; North and northeastern regions of Brazil (though this is contested);[18] Old Providence Island in Colombia; Costa Rica; the Dominican Republic; Panama; Swan Islands in Honduras; Jamaica; Martinique; Alacran Reef, Campeche, Cayos Arcas and Quintana Roo, in Mexico; Puerto Rico; Saint Barthélemy; Mustique and Grenada in the Grenadines; Pinar del Río, North Havana Province, North Matanzas, Villa Clara, Cienfuegos, Holguín, Santiago de Cuba and Guantánamo, in the Turks and Caicos Islands and Cuba; South Carolina, Florida, with the Florida Keys and Flower Garden Banks National Marine Sanctuary, in the United States; Carabobo, Falcon, Gulf of Venezuela, Los Roques archipelago, Los Testigos Islands and Sucre in Venezuela; all islands of the United States Virgin Islands.

Aliger gigas lives at depths from 0.3–18 m[37] to 25–35 m.[35][56] Its depth range is limited by the distribution of seagrass and algae cover. In heavily exploited areas, the queen conch is more abundant in the deepest range.[56] The queen conch lives in seagrass meadows and on sandy substrate,[52] usually in association with turtle grass (species of the genus Thalassia, specifically Thalassia testudinum[40] and also Syringodium sp.)[38] and manatee grass (Cymodocea sp.).[36] Juveniles inhabit shallow, inshore seagrass meadows, while adults favor deeper algal plains and seagrass meadows.[37][62] The critical nursery habitats for juvenile individuals are defined by a series of characteristics, including tidal circulation and macroalgal production, which together enable high rates of recruitment and survival.[63] A. gigas is typically found in distinct aggregates that may contain several thousand individuals.[39]

Strombid gastropods were widely accepted as carnivores by several authors in the 19th century, a concept that persisted until the first half of the 20th century. This erroneous idea originated in the writings of Jean-Baptiste Lamarck, who classified strombids with other supposedly carnivorous snails. This idea was subsequently repeated by other authors, but had not been supported by observation. Subsequent studies have refuted the concept, proving beyond doubt that strombid gastropods are herbivorous animals.[64] In common with other Strombidae,[21] Aliger gigas is a specialized herbivore,[34] that feeds on macroalgae (including red algae, such as species of Gracilaria and Hypnea),[42] seagrass[36] and unicellular algae, intermittently also feeding on algal detritus.[64][65] The green macroalgae Batophora oerstedii is one of its preferred foods.[37]

A few different animals establish commensal interactions with A. gigas, which means that both organisms maintain a relationship that benefits (the commensal) species but not the other (in this case, the queen conch). Commensals of this species include certain mollusks, mainly slipper shells (Crepidula spp.) The porcelain crab Porcellana sayana is also known to be a commensal and a small cardinalfish, known as the conch fish (Astrapogon stellatus),[38] sometimes shelters in the conch's mantle for protection.[37] A. gigas is very often parasitized by protists of the phylum Apicomplexa, which are common mollusk parasites. Those coccidian[66][67] parasites, which are spore-forming, single-celled microorganisms, initially establish themselves in large vacuolated cells of the host's digestive gland, where they reproduce freely.[66][67] The infestation may proceed to the secretory cells of the same organ. The entire life cycle of the parasite typically occurs within a single host and tissue.[66]

Aliger gigas is a prey species for several carnivorous gastropod mollusks, including the apple murex Phyllonotus pomum, the horse conch Triplofusus papillosus, the lamp shell Turbinella angulata, the moon snails Natica spp. and Polinices spp., the muricid snail Phyllonotus margaritensis, the trumpet triton Charonia variegata and the tulip snail Fasciolaria tulipa.[18][33][68] Crustaceans are also conch predators, such as the blue crab Callinectes sapidus, the box crab Calappa gallus, the giant hermit crab Petrochirus diogenes, the spiny lobster Panulirus argus and others.[33][68] Sea stars, vertebrates, horse conch, octopus, eagle ray, nurse shark, fish (such as the permit Trachinotus falcatus[69] and the porcupine fish Diodon hystrix), loggerhead sea turtles (Caretta caretta) and humans also eat the queen conch.[33][68]

On the island of Anegada, British Virgin Islands, a heap consists of thousands of empty queen conch shells, discarded after their flesh was taken for human consumption.

Queen conch populations have been rapidly declining throughout the years and have been mostly depleted in some areas in the Caribbean due to the fact that they are highly sought after for their meat and their value.[84] Within the conch fisheries, one of the threats to sustainability stems from the fact that there is almost as much meat in large juveniles as there is in adults, but only adult conchs can reproduce, and thus sustain a population.[71] In many places where adult conchs have become rare due to overfishing, larger juveniles and subadults are taken before they ever mate.

In the United States (Florida), it is currently illegal to gather or pick the queen conch either recreationally or commercially.[85] In other parts of the world where it is legal, only adult conchs can be fished. The rule is to let each conch have ample time to reproduce before taken out of its habitat, potentially leading to a more stable population. However, this rule has not been followed by countless fishers.[84][71][86] On a number of islands, subadults provide the majority of the harvest.[87] The abundance of Aliger gigas is declining throughout its range as a result of overfishing and poaching. Especially because of overfishing, many pockets of conch communities fall below the critical level needed for reproducing. A 2019 study predicted overfishing could lead to the extinction of queen conchs in as little as ten years.[88] Additionally, if the conch fishery collapses, it could potentially leave over 9,000 Bahamian fishers out of work.[84] Trade from many Caribbean countries, such as the Bahamas, Antigua and Barbuda, Honduras, Haiti and the Dominican Republic, is known or thought to be unsustainable.[86] As of 2001, queen conch populations in at least 15 Caribbean countries and states were overfished or overexploited.[86] Illegal harvest, including fishing in foreign waters and subsequent illegal international trade, is a common problem in the region.[59] The Caribbean "International Queen Conch Initiative" is an international attempt at managing this species.[61] On 13 January 2019, the Bahamas' Department of Marine Resources announced it would be making official recommendations to better protect the conch, including ending exports and increasing regulatory staff.[84]

Presently, ocean acidification is another serious threat to the queen conch. Acidity levels are rising and adversely affecting shellfish larvae. Rising atmospheric CO₂ levels result in rising levels of carbonic acid in seawater, which is particularly harmful to organisms with calcium carbonate shells and structures. Certain larval stages of shellfish are very sensitive to lower seawater pH.[89]

The queen conch fishery is usually managed under the regulations of individual nations. In the United States all taking of queen conch is prohibited in Florida and in adjacent Federal waters. No international regional fishery management organization exists for the whole Caribbean area, but in places such as Puerto Rico and the Virgin Islands, queen conch is regulated under the auspices of the Caribbean Fishery Management Council (CFMC).[59] In 2014, the Parties to the Convention for the Protection and Development of the Marine Environment of the Wider Caribbean Region (Cartagena Convention) included queen conch in Annex III of its Protocol Concerning Specially Protected Areas and Wildlife (SPAW Protocol). Species included in the Annex III require special measures to be taken to ensure their protection and recovery, and their use is authorised and regulated accordingly.[90][91]

The species is listed in Appendix II of the Convention on International Trade in Endangered Species (CITES) meaning international trade (import/export) in the species and its parts and derivatives is regulated by the CITES permitting system.[39] The listing was proposed by the United States making queen conch the first large-scale fisheries product to be regulated by CITES (as Strombus gigas).[59][92][93] In 1995 CITES began reviewing the biological and trade status of the queen conch under its "Significant Trade Review" process. These reviews are undertaken to address concerns about trade levels in an Appendix II species. Based on the 2003 review,[72] CITES recommended that all countries prohibit importation from Honduras, Haiti and the Dominican Republic, according to Standing Committee Recommendations.[94] Queen conch meat continues to be available from other Caribbean countries, including Jamaica and Turks and Caicos, which operate well-managed queen conch fisheries.[59] For conservation reasons, the Government of Colombia currently bans the commercialisation and consumption of the conch between the months of June and October.[95] The Bahamas National Trust is building awareness by educating teachers and students through workshops and an awareness campaign which includes the catchy pop song Conch Gone.[96]