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Wild A to Z: Invertebrates

For each letter of the alphabet, name the invertebrate associated with the description.
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aestheticdirt
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Last updated: August 13, 2025
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First submittedAugust 13, 2025
Times taken9
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Hint
Letter
Answer
Refers to a large group of invertebrates, such as centipedes, millipedes, crustaceans, and insects, characterized by their exoskeletons, jointed legs, and symmetrical, segmented bodies.
A
Arthropod
A chemical reaction in this insect’s body lets it spray a boiling hot, caustic chemical spray from its abdomen as a defense mechanism against predators.
B
Bombardier beetle
The “cigarette snail”, an ornate snail species whose sting is so venomous, one only has time to smoke one last cigarette before they die, is a type of this predatory marine snail.
C
Cone snail
A slender, delicate, metallic blue insect with two sets of wings, which lives near the water and feeds on mosquitoes.
D
Damselfly
These burrowing, segmented roundworms are commonly seen following a heavy rain, and play a major role in soil health as decomposers. They also have five hearts.
E
Earthworm
These soft beetles, also called lightning bugs, are known for their bioluminescence.
F
Firefly
Some believe legends of the Kraken to have been inspired by this behemoth of the deep.
G
Giant squid
These ancient creatures are over 400 million years old, and, despite their name, are more closely related to spiders and scorpions than crabs.
H
Horseshoe crab
The larvae of geometer moths are commonly known as this, and are roughly 2.5cm long.
I
Inchworm
These metallic green and copper beetles are native to Asia, and have become a significant invasive species in the North American ecosystem.
J
Japanese beetle
These small, sheimp-like crustaceans are a major food source of many different whale species.
K
Krill
These minuscule creatures sound phoenetically similar to a country in Asia.
L
Louse
A phylum of aquatic animals that include oysters, clams, snails, and cephalopods.
M
Mollusca
Hint
Letter
Answer
A cephalopod member of the above, with a large, chambered shell.
N
Nautilus
This group of spiders is known for building large, intricate, circular webs, known as orb webs.
O
Orb-weaver spider
Easily mistaken for a jellyfish, these organisms are actually colonies of zooids, which work together to form an entity with a gas-filled float and venomous, stinging tentacles.
P
Portuguese man-o’-war
A round, hard-shelled clam, which is the namesake of a fictional city in Rhode Island.
Q
Quahog
While these creatures, also known as pill bugs, appear insectoid, they are actually crustaceans.
R
Roly-poly
These marine invertebrates have a symbiotic relationship with animals such as clownfish, which are immune to their stings and find shelter in their many tentacles.
S
Sea anemone
These small, pesky creatures, known for burrowing into decaying plant material, live underground and, with the exception of queens and kings, do not have eyes.
T
Termite
While this word originally referred to hedgehogs, it is now associated with a type of spiny, venomous sea creature.
U
Urchin
These small, red cephalopods have eight tentacles, connected by webbing, and is not a squid or octopus, but belongs to its own order, Vampyromorpha.
V
Vampire squid
These long-nosed insects are notorious for infesting grains such as rice.
W
Weevil
The order of H, named for a Greek weapon.
X
Xiphosura
A species of social wasps with yellow and black stripes, known for their aggression and tendency to sting.
Y
Yellowjacket
These large, aggressive hornets have black and cream colored stripes, and often dwell in plants such as trumpet vines.
Z
Zebra hornet
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