Sea Monsters, Marine Biology, and Ocean Explorations

Comprehensive practice flashcards reviewing all key terms, historical figures, taxonomic entities, physiological adaptations, and ecological concepts from the lectures on sea monsters, blood-suckers, marine parasites, harmful algal blooms, navigation, and shark ecology.

Candiru (Vandellia cirrhosa)

A small species of parasitic freshwater catfish in the family Trichomycteridae native to the Amazon Basin; it is notorious for the persistent myth (dismissed by Francis de Castelnau in 1855) that it can swim up a human urine stream into the urethra.

Ammocoetes

The worm-like larval stage of the lamprey that burrows into stream sediments for up to seven years, functioning as an ecosystem engineer by filter feeding, aerating the water, and recycling nutrients.

Lamprey Oral Disc

The jawless, disc-shaped suction-cup mouth of a sea lamprey, ringed with sharp keratinized teeth and equipped with a raspy tongue used to abrade fish scales and feed on blood and body fluids.

Welland Canal

An inland navigational shipping canal opened in 1829 connecting Lake Ontario to Lake Erie; it bypassed Niagara Falls and inadvertently allowed invasive sea lampreys to enter the upper Great Lakes, decimating regional lake trout fisheries by the 1930s.

Traditional Ecological Knowledge (TEK)

The cumulative body of knowledge, practices, and beliefs concerning the relationships of living beings with one another and with their environment, preserved and adapted through oral history, direct observation, and generational experience.

Seventh Generation Principle

An ancient Indigenous governance framework originating from the Great Law of the Haudenosaunee Confederacy, dictating that all current decisions must preserve a sustainable world and healthy relationships seven generations into the future.

Cultural Burning

The deliberate application of low-intensity, seasonal controlled fires by Indigenous peoples to clear underbrush, replenish soil nutrients, encourage fire-tolerant flora, and prevent destructive catastrophic wildfires.

Marine Nutrient Vectors

Anadromous organisms, such as Pacific salmon, that accumulate marine-derived isotopes ($^{15}\text{N}$ and $^{13}\text{C}$) at sea and deliver up to $80\%$ of the nitrogen found in giant riparian trees like Sitka spruce via predator consumption and carcass decomposition.

Harmful Algal Bloom (HAB)

A rapid proliferation of toxic or non-toxic phytoplankton or cyanobacteria that results in hypoxia, fish mortalities, toxic seafood bioaccumulation, or noxious foam and discoloration along coastal and freshwater waterways.

Brevetoxins

A suite of lipid-soluble polyether neurotoxins produced by the unarmored marine dinoflagellate Karenia brevis; they trigger Neurotoxic Shellfish Poisoning (NSP) and cause severe aerosolized respiratory irritation when sea spray carries them ashore.

Saxitoxin

A potent alkaloid neurotoxin produced by marine dinoflagellates such as Alexandrium and Pyrodinium; it selectively blocks voltage-gated sodium channels, causing Paralytic Shellfish Poisoning (PSP) in humans who ingest contaminated bivalves.

Pfiesteria piscicida

An estuarine dinoflagellate exhibiting a complex polymorphic life cycle with amoeboid and flagellated stages; notorious for causing massive fish kills and releasing volatile toxins that cause systemic human health issues upon inhalation or dermal contact.

Estuary Associated Syndrome

A clinical syndrome identified in watermen and researchers exposed to waters harboring toxic blooms of Pfiesteria piscicida, characterized by acute memory loss, cognitive confusion, skin lesions, and headaches.

Photophore

A specialized glandular light-emitting organ present in various marine organisms (including lanternfish, deep-sea squids, and lanternsharks) that produces bioluminescence for counterillumination, predator deterrence, or mate attraction.

Bioluminescent Reaction

An exergonic biochemical oxidation wherein the substrate luciferin is converted into an electronically excited state by the catalytic enzyme luciferase in the presence of oxygen, emitting photons predominantly in the blue-green spectrum ($\text{FMNH}_2 + \text{O}_2 + \text{RCHO} \rightarrow \text{FMN} + \text{RCOOH} + \text{H}_2\text{O} + \text{light}$).

Globster

A cryptozoological term coined by Ivan T. Sanderson in 1962 to describe an unidentified, beached organic mass of marine tissue that lacks visible eyes, bones, or a defined head structure, typically consisting of decaying whale blubber and collagen.

Trunko

The moniker given to a legendary 47-foot-long, white-haired marine carcass featuring a 5-foot-long trunk-like snout, reported fighting two killer whales before beaching on the coast of Margate, South Africa in 1922.

Stronsay Beast

A 55-foot decomposing marine carcass stranded on Scotland's Orkney Islands in 1808; mistakenly designated by Edinburgh naturalists as a new species of sea serpent named Halsydrus pontoppidani before anatomical evaluation identified it as a basking shark.

Whale Fall

The ecological event occurring when a cetacean carcass sinks to the abyssal or bathyal seafloor at depths greater than $1,000\,\text{m}$, sustaining a specialized, multi-stage benthic community for decades.

Sulfophilic Stage

The third ecological succession stage of a deep-sea whale fall, lasting between 50 and 100 years, during which anaerobic bacteria reduce dissolved sulfate ($\text{SO}_4^{2-}$) to break down bone lipids, emitting toxic hydrogen sulfide ($\text{H}_2\text{S}$) that sustains chemosynthetic microbial mats.

Marine Snow

A continuous shower of non-living macroscopic organic aggregates ($>0.5\,\text{mm}$ in diameter) comprising phytoplankton detritus, zooplankton fecal pellets, mucous feeding structures, and transparent exopolymer particles that sink through the water column.

Whale Pump

The biological mechanism whereby whales feed on prey at depth in the mesopelagic zone and release buoyant, nutrient-rich fecal plumes and urea at the surface, upwardly recharging nitrogen and iron in the euphotic zone.

Peritrophic Membrane

A durable chitin- and polysaccharide-rich sheath enclosing the fecal pellets of marine crustaceans, preventing rapid microbial degradation and accelerating downward sinking velocities through the water column ($>100\,\text{m/day}$).

Sirenia

An order of fully aquatic, herbivorous placental mammals comprising living manatees and dugongs, named after the classical mythological sirens due to their historical confusion with mermaids by early European mariners.

Atargatis

An ancient Syrian fertility goddess dating to around 1000 BC who dove into a sacred lake near Hierapolis and transformed into a hybrid creature—half-woman, half-fish—constituting one of history's earliest recorded mermaid depictions.

Qallupilluk

A predatory amphibious being from Inuit folklore characterized by bumpy, scaly green skin resembling a sculpin and a pungent sulfur smell, described as lurking beneath sea ice cracks to snatch unaccompanied children.

Jenny Haniver

A dried and modified carcass of a skate or ray that has been strategically carved, shaped, varnished, and dried by fishermen to resemble a miniature devil, mermaid, or mythical cryptid for sale as a curiosity.

Florida Manatee (Trichechus manatus latirostris)

A native sub-species of the West Indian manatee whose statewide census rose from 1,267 in 1991 to an estimated 9,790 in 2025, but which faces critical threats from watercraft strikes, cold stress, and seagrass die-offs caused by brown tide algal blooms.

Pleistocene Megafauna Extinction

A rapid prehistoric extinction pulse between 13,000 and 9,000 years ago that eliminated more than half of large mammalian genera across the Americas, coinciding with climatic shifts and the arrival of humans utilizing Clovis hunting technology.

Clovis Point

A distinctive, bifacially fluted prehistoric stone spear point manufactured by early Paleo-Indian peoples approximately 11,000 to 13,000 years ago, widely associated with big-game hunting of late Pleistocene megafauna.

Scurvy

A fatal nutritional deficiency disorder resulting from an absence of Vitamin C (ascorbic acid), which prevents stable collagen synthesis and leads to gum ulceration, systemic bleeding, reopening of old wounds, physical exhaustion, and death.

James Lind

A Scottish naval surgeon credited with conducting one of the earliest recorded controlled clinical trials aboard HMS Salisbury in 1753, proving that dietary supplementation with citrus fruit rapidly and reliably cures scurvy.

Great Circle

Any imaginary circular line that divides a sphere into two equal hemispheres; on Earth, the Equator represents the only true east-west great circle parallel.

Sextant

An analog optical navigation device with a 60-degree arc ($\frac{1}{6}$ of a circle) that employs double reflection mirrors to measure celestial angles up to $120^\circ$ above the horizon for calculating latitude at local solar noon.

Scilly Naval Disaster of 1707

A catastrophic maritime accident in which four Royal Navy warships under Admiral Sir Cloudesley Shovell wrecked against the rocks of the Isles of Scilly due to severe navigational positioning errors, drowning 1,400 to 2,000 sailors.

Longitude Act 1714

An Act of the British Parliament establishing the Board of Longitude and offering an unprecedented cash prize of £20,000 to anyone who could develop a practical, accurate method for determining longitude at sea within specified precision limits.

John Harrison

An English self-taught clockmaker and carpenter who resolved the longitude problem by designing high-precision marine chronometers (H1 through H4) capable of keeping stable time across variable sea temperatures and rocking ship motions.

Ophiocordyceps unilateralis

An entomopathogenic parasitic fungus that invades the nervous system of carpenter ants, altering their behavioral programming to make them climb plants and clamp onto leaf veins before growing a reproductive stalk through their heads.

Cymothoa exigua

A parasitic marine isopod that enters marine fish via the operculum, severs the lingual blood supply to the tongue until the organ atrophies and falls off, and permanently grips the lingual stump to act as a mechanical substitute.

Bitter Crab Disease

A fatal disease in commercially harvested cold-water crabs (such as snow and tanner crabs) caused by parasitic dinoflagellates of the genus Hematodinium, which alters host hemolymph and makes the muscle tissue unpalatable with a strong aspirin taste.

MSX Disease (Multinucleated Sphere Unknown)

A lethal protozoan infection of the eastern oyster (Crassostrea virginica) caused by the parasite Haplosporidium nelsoni, introduced into Chesapeake Bay through foreign oyster importations and severely restricting bivalve growth, feeding, and valve adduction.

Sacculina carcini

A parasitic barnacle belonging to the group Rhizocephala that invades crabs, establishes a nutrient-absorbing internal root network, chemically castrates the host, and manipulates both sexes into caring for the parasite's external brood pouch as if it were their own eggs.

Placentanema gigantisma

The largest documented parasitic nematode worm in existence, attaining lengths of up to 24 feet ($\approx 7.3\,\text{m}$) within the placenta and uterus of pregnant sperm whales.

Carta Marina

A celebrated 1539 navigational sea chart created in Rome by Swedish cleric Olaus Magnus, famed for illustrating Northern European geography alongside detailed depictions of fantastical, aggressive sea serpents and leviathans.

Mester Stoor Worm

A gigantic, venomous sea serpent from Orkney and Scottish folklore, described as one of the nine curses that plagued mankind, whose foul, putrid breath was reputed to kill all living things and splinter wooden ships.

Hydrarchos

A fraudulent 114-foot composite fossil exhibited in New York in 1845 by Albert Koch as an antediluvian sea serpent, subsequently debunked by anatomist Jeffries Wyman as an artificial assemblage of skeletal elements from multiple Basilosaurus archaeocete whales.

Basilosaurus

An elongate, serpentine archaeocete whale from the late Eocene ($\approx 37\,\text{mya}$) that possessed functioning, highly reduced vestigial hind limbs and transmitted acoustic vibrations directly from its lower jaw to its middle ear.

Ambulocetus

A transitional, 4-meter-long amphibious stem cetacean from the early Eocene ($\approx 48\,\text{mya}$) featuring well-developed limbs adapted for both walking on land and undulating through coastal waterways.

Melon

A bulbous, lipid-rich organ situated in the forehead of toothed whales (Odontocetes) that acoustically focuses and directs high-frequency biosonar clicks used for underwater echolocation and prey detection.

Cryptozoology

A pseudoscience established in the 1950s by zoologists Bernard Heuvelmans and Ivan T. Sanderson dedicated to the search for and study of undiscovered, extinct, or legendary animals whose presence is disputed by mainstream biology.

Antonie van Leeuwenhoek

A Dutch draper and pioneering microscopist who hand-ground optical lenses to discover single-celled microorganisms ('animalcules'), refuting the doctrine of spontaneous generation and co-founding the science of microbiology.

Robert Hooke

An English polymath and author of Micrographia (1665) who coined the term 'cell,' proposed wave properties of light, derived planetary inverse-square mechanics, and deduced that fossil shells represented extinct biological organisms.

Carl Linnaeus

The Swedish botanist and physician who founded modern biological taxonomy and ecology by introducing the hierarchical classification system and formal binomial nomenclature in Systema Naturae (1735).

Gregor Mendel

An Austrian-Czech Augustinian friar, botanist, and mathematician whose rigorous cross-breeding experiments with Pisum sativum pea plants established the fundamental particulate laws of genetic inheritance.

Chondrichthyes

A taxonomic class of jawed vertebrates comprising sharks, rays, skates, and chimaeras that possess a flexible cartilaginous skeleton rather than true bone, originating in the fossil record around 450 million years ago.

Kinocilium

A specialized, elongated cilium projecting from the hair cells of a shark's inner ear and lateral line system that embeds within a gelatinous cupula to detect acoustic vibrations and local hydrodynamic pressure changes.

Tapetum Lucidum

A specialized reflective tissue layer situated immediately behind the retina in sharks, consisting of guanine crystal plates that bounce transmitted light back onto photoreceptors, enhancing low-light visual sensitivity up to 10-fold.

Ampullae of Lorenzini

An array of external pores on a shark's head leading to jelly-filled subcutaneous canals and innervated sensory ampullae, specialized for detecting microvolt bioelectric fields emitted by hidden or struggling prey.

Nictitating Membrane

A tough, protective transparent third eyelid that sweeps horizontally across the eye during prey capture in many carcharhinid sharks; notably absent in Great White Sharks, which protect their eyes by rolling them back into the orbital sockets.

Cookiecutter Shark (Isistius brasiliensis)

A small, bioluminescent pelagic dogfish shark with suctorial mouthparts and triangular lower teeth capable of gouging circular flesh plugs from large pelagic fauna; famously documented biting and sinking an inflatable catamaran in the Coral Sea in 2023.

Tsukumo Shark Attack Victim

A Jōmon period hunter-fisher skeleton from Okayama, Japan dating to 1370–1010 cal BC displaying at least 790 perimortem traumatic gouges, tooth serration striations, and blunt force fractures from a fatal attack by a tiger or white shark.

Otodus megalodon

An extinct apex lamniform shark that reached lengths of 12 to 18 meters during the Neogene; it commanded a calculated bite force between $108,514\,\text{N}$ and $182,201\,\text{N}$ to prey on large marine mammals before going extinct during the Pliocene.

Trimethylamine Oxide (TMAO)

An osmolyte and protein-stabilizing compound concentrated in the muscle tissues of Greenland sharks to counter extreme Arctic cold and hydrostatic pressure; highly intoxicating and neurotoxic if consumed raw.

Hákarl

A traditional fermented Icelandic culinary dish made by burying and curing Greenland shark meat for several months and drying it for four to five months to break down and purge toxic concentrations of trimethylamine oxide.

Trophic Cascade

An ecological indirect control dynamic across multiple trophic levels, wherein the abundance or behavior of an apex predator controls the population of mesopredators or herbivores, thereby protecting basal plant or habitat structures.

Top-Down Control

The trophic process in which high-trophic-level consumers regulate the population density, structure, and behavior of lower-trophic-level prey species, preventing overgrazing and stabilizing the broader ecosystem.

Peter and Paul Lake Experiment

A landmark ecosystem manipulation study in Michigan demonstrating trophic cascades in freshwater lakes: dividing a single lake in two and altering top piscivorous fish populations induced dramatic, reciprocal shifts down through zooplankton and phytoplankton.

Coastal Shark Cascade

The ecological process documented by Ransom Myers and colleagues (2007) wherein commercial overexploitation of apex coastal sharks triggered a mesopredator release of cownose rays, whose unchecked predation caused the collapse of North Carolina's bay scallop fishery.