The English language is filled with linguistic curiosities that trace their roots back to Latin, and the word species is perhaps one of the most frequently discussed examples in both scientific and everyday contexts. Understanding how to navigate nouns that do not follow standard pluralization patterns is essential for clear communication, especially when dealing with words like species, series, means, and crossroads. These invariant nouns maintain the same form regardless of whether you are discussing a single entity or a vast collection of different types. Mastering this particular word is vital for biologists, students, and writers who need to describe biological diversity with precision and grammatical accuracy.
This comprehensive guide explores the etymology, grammatical classification, and practical application of the word species. By the end of this article, you will understand why we do not say “specie” when referring to a single animal and why the plural form does not require an additional “es” or “s” at the end. We will delve into the historical reasons for this consistency and provide ample examples to ensure you never feel confused by this biological term again.
Table of Contents
- Definition and Linguistic Classification
- Structural Breakdown of the Word
- The Plural Rule: Why It Stays the Same
- Scientific Context vs. Monetary Context
- Extensive Usage Examples
- Comparison Tables and Reference Lists
- Common Mistakes and How to Avoid Them
- Advanced Topics: Latin Plurals in English
- Practice Exercises and Quizzes
- Frequently Asked Questions (FAQ)
- Conclusion and Key Takeaways
Definition and Linguistic Classification
The word species (pronounced SPEE-sheez or SPEE-seez) is classified as a noun that belongs to a specific group of English words known as invariant nouns or zero plurals. In biological terms, a species refers to a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. It is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial.
Grammatically, species is a count noun, meaning it can be quantified. However, unlike regular count nouns like “cat” (singular) and “cats” (plural), species does not change its spelling. It functions as both the singular and the plural form. This can often lead to confusion for English learners who are accustomed to the standard rule of adding “-s” or “-es” to indicate multiplicity.
In a broader, non-biological sense, the word can also refer to a kind or sort of something. For instance, one might speak of a “particular species of politics” or a “species of logic.” Even in these metaphorical or abstract uses, the word remains species in both singular and plural contexts. It is derived from the Latin word species, meaning “a sight, outward appearance, shape, or kind.”
Structural Breakdown of the Word
To understand why species behaves the way it does, we must look at its Latin morphology. In Latin, species belongs to the fifth declension. Nouns in this group often have the same form for the nominative singular and the nominative plural. When English adopted the word in the 14th century, it retained this specific Latin characteristic.
The structure of the word consists of the root and the suffix “-ies.” In many English words, an “-ies” ending is the result of changing a “y” to “i” and adding “es” (like fly to flies). However, in species, the “ies” is part of the original Latin stem. Therefore, removing the “s” to create “specie” is a back-formation error that changes the meaning of the word entirely.
The word’s structural integrity is paramount. Because the “s” at the end is not a plural marker but a part of the root, the word remains stable. This is similar to other Latin-derived words like series. You would never say “a lone seri” or “several serieses.” Understanding this structural history helps learners appreciate why the word resists standard English pluralization rules.
The Plural Rule: Why It Stays the Same
The primary rule for species is simple but strict: The singular is “species” and the plural is “species.” There is no variation in spelling between the two. The distinction between whether you are talking about one or many depends entirely on the surrounding context, specifically the articles, adjectives, and verb conjugations used in the sentence.
For example, “This is a rare species” uses the singular verb “is” and the indefinite article “a,” signaling that we are discussing one type of organism. Conversely, “There are many species in the rainforest” uses the plural verb “are” and the quantifier “many,” signaling that we are discussing multiple types.
This lack of change is what linguists call a zero-inflection plural. Other examples of this in English include animals like sheep, deer, and fish (though “fishes” is sometimes used in specific scientific contexts). However, while sheep is a Germanic root, species is a Latin root, showing that zero-inflection can occur across various etymological backgrounds in English.
Scientific Context vs. Monetary Context
A common point of confusion is the existence of the word specie. While it looks like the singular of species, it is a completely different word with a specific meaning in economics and law. Specie (without the ‘s’) refers to money in the form of coins rather than notes. It comes from the Latin phrase in specie, meaning “in the actual form.”
In a scientific or biological context, using the word “specie” is considered a grammatical error. If a biologist says, “I discovered a new specie,” they are accidentally saying they discovered a new type of coin. To maintain professional and academic standards, one must always use species when referring to biological organisms, even if there is only one.
The distinction is crucial for students. In biology exams or research papers, using “specie” can result in lost marks or a lack of clarity. Always remember: if it has DNA, it’s a species. If it’s a gold or silver coin, it’s specie. This distinction is one of the most important “traps” in scientific English writing.
Extensive Usage Examples
To truly master the use of species, it is helpful to see it in action across various sentence structures. Notice how the word itself never changes, but the words around it provide the necessary clues for number.
Singular Usage Examples:
- The mountain gorilla is an endangered species.
- Scientists found a single species of bacteria that can survive in extreme heat.
- Every species has a unique role to play in the ecosystem.
- A new species of orchid was discovered in the Amazon last month.
- The giant panda is perhaps the most famous species in conservation efforts.
Plural Usage Examples:
- There are thousands of species of beetles in the world.
- Many species are currently facing the threat of extinction.
- The Darwin finches consist of several different species spread across the islands.
- How many species of birds migrate through this region annually?
- These two species look identical but have different mating calls.
Comparison Tables and Reference Lists
The following tables provide a clear visual reference for how species compares to other nouns and how it functions in different grammatical environments. These tables are designed to help you quickly identify patterns and avoid common pitfalls.
Table 1: Invariant Nouns (Singular vs. Plural)
This table lists nouns that, like species, do not change their form between singular and plural. This is a helpful reference for understanding the “zero plural” category.
| Singular Form | Plural Form | Example Sentence (Plural) |
|---|---|---|
| Species | Species | Several species of fish live here. |
| Series | Series | The network aired three series this year. |
| Means | Means | They used all available means to escape. |
| Crossroads | Crossroads | The travelers reached the crossroads. |
| Headquarters | Headquarters | The company has multiple headquarters. |
| Sheep | Sheep | The flock contained fifty sheep. |
| Deer | Deer | We saw five deer in the meadow. |
| Aircraft | Aircraft | The hangar held several aircraft. |
| Spacecraft | Spacecraft | NASA launched two spacecraft yesterday. |
| Bison | Bison | The plains were covered with bison. |
| Offspring | Offspring | The animals protect their offspring. |
| Shrimp | Shrimp | We caught a bucket of shrimp. |
| Squid | Squid | Giant squid are rarely seen. |
| Moose | Moose | Three moose blocked the road. |
| Swine | Swine | The farmer raised many swine. |
| Gallows | Gallows | The old town had two gallows. |
| Barracks | Barracks | The soldiers moved into the barracks. |
| Corps | Corps | The peace corps operate worldwide. |
| Chassis | Chassis | The factory produced 100 chassis. |
| Species | Species | There are many species of oak trees. |
Table 2: Species vs. Specie
This table highlights the critical difference between the biological term and the monetary term to prevent the most common error associated with this word.
| Word | Meaning | Context | Example |
|---|---|---|---|
| Species (Singular) | A specific type of organism | Biology / Science | I saw a rare species of bird. |
| Species (Plural) | Multiple types of organisms | Biology / Science | There are many species of birds. |
| Specie (Singular) | Money in the form of coin | Finance / Law | The debt was paid in gold specie. |
| Specie (Plural) | Rarely used plural of coins | Finance / Law | The treasury held various specie. |
| “Specieses” | Incorrect spelling | None | DO NOT USE. |
| “Specie” (as animal) | Incorrect usage | None | DO NOT USE for animals. |
| Genus | Category above species | Taxonomy | The genus includes five species. |
| Genera | Plural of Genus | Taxonomy | These genera contain many species. |
| Subspecies | Division of a species | Biology | The tiger has several subspecies. |
| Biota | All species in an area | Ecology | The lake’s biota is diverse. |
| Flora | Plant species | Botany | The local flora is unique. |
| Fauna | Animal species | Zoology | The desert fauna is nocturnal. |
| Taxon | A taxonomic group | Science | A species is a type of taxon. |
| Taxa | Plural of Taxon | Science | These taxa include many species. |
| Specimen | An individual example | Science | This specimen is a male of the species. |
| Specimens | Multiple examples | Science | We collected ten specimens. |
| Type | General category | General | What species/type is this? |
| Kind | General category | General | A species is a kind of animal. |
| Variety | Variation within species | Botany | This species has many varieties. |
| Strain | Variation in microbes | Microbiology | A species can have many strains. |
Table 3: Subject-Verb Agreement with “Species”
Because the spelling doesn’t change, the verb is the only way to know if the subject is singular or plural. This table shows how to match verbs correctly.
| Number | Determiner/Adjective | Verb Form | Example Sentence |
|---|---|---|---|
| Singular | A / An | Is / Was / Has | A species is vanishing. |
| Plural | Many / Several | Are / Were / Have | Many species are vanishing. |
| Singular | This / That | Does / Goes | This species does not fly. |
| Plural | These / Those | Do / Go | These species do not fly. |
| Singular | One | Lives | One species lives in the cave. |
| Plural | Two / Three | Live | Two species live in the cave. |
| Singular | Every | Needs | Every species needs water. |
| Plural | All | Need | All species need water. |
| Singular | The only | Exists | The only species that exists here. |
| Plural | The various | Exist | The various species that exist here. |
| Singular | Each | Has | Each species has a name. |
| Plural | Both | Have | Both species have names. |
| Singular | A single | Appears | A single species appears to be new. |
| Plural | Numerous | Appear | Numerous species appear to be new. |
| Singular | The specific | Thrives | The specific species thrives here. |
| Plural | Different | Thrive | Different species thrive here. |
| Singular | Another | Migrates | Another species migrates south. |
| Plural | Other | Migrate | Other species migrate south. |
| Singular | Which | Is | Which species is that? |
| Plural | Which | Are | Which species are native? |
Comprehensive Coverage of Rules
When using the word species, there are several nuanced rules that go beyond simple pluralization. These rules ensure that your writing is not only grammatically correct but also scientifically precise.
1. The Article Rule
Because species is a count noun, it usually requires an article when used in the singular. You would say “a species” or “the species,” but rarely just “species” unless you are using it in a plural sense or as a collective concept. For example, “Species diversity is important” uses the word as an abstract concept, whereas “The species is endangered” refers to a specific group.
2. Subject-Verb Agreement
As shown in Table 3, the verb must match the intended number. This is the most common area where writers slip up. If you are discussing the genus Canis, you might say, “The Canis species is widespread.” If you are discussing both dogs and wolves, you would say, “These two species are related.” Always look at your quantifiers (one, many, each, all) to determine the verb form.
3. Collective Contexts
Sometimes, species is used to refer to a whole group as a single entity. In these cases, it behaves like a collective noun. While American English tends to treat collective nouns as singular, British English often allows for plural verbs if the focus is on the individual members. However, with species, it is safer to stick to the intended count (singular for one, plural for more than one).
4. Binomial Nomenclature
In scientific writing, a species is often identified by its Latin name (e.g., Homo sapiens). Even when the Latin name ends in “s,” the rules remain the same. Homo sapiens is a single species. If you were discussing multiple groups within the Homo genus, you would say “various Homo species.” Never add an “s” to the end of a Latin species name to make it plural.
Common Mistakes and How to Avoid Them
Even seasoned writers can make mistakes with species. Here are the most frequent errors and the corrections you need to keep in mind.
| Incorrect Usage | Correct Usage | Explanation |
|---|---|---|
| A new specie was found. | A new species was found. | “Specie” refers to coins, not animals. |
| Many specieses live here. | Many species live here. | “Specieses” is not a word in English. |
| The species are small. (Referring to one) | The species is small. | Singular subjects need singular verbs. |
| This species live in water. | This species lives in water. | Third-person singular needs “s” on the verb. |
| All species has DNA. | All species have DNA. | Plural subjects need plural verbs. |
| A species’s habitat. | A species’ habitat. | Possessive of words ending in “s” often use just the apostrophe. |
The mistake of using “specie” as the singular of “species” is known as back-formation. This happens when people assume that because a word ends in “s,” the “s” must be a plural marker that can be removed. This is the same logic that leads people to say “pease” instead of “pea” or “kudo” instead of “kudos.” However, in the case of species, the “s” is vital to the word’s identity.
Advanced Topics: Latin Plurals in English
The word species is part of a larger group of Latin-derived words that often confuse English speakers. Understanding these patterns can help you master a wider range of academic vocabulary. English has several ways of handling Latin plurals:
- The -us to -i change: Cactus becomes cacti, stimulus becomes stimuli.
- The -um to -a change: Bacterium becomes bacteria, datum becomes data.
- The -is to -es change: Analysis becomes analyses, crisis becomes crises.
- The invariant -es: Species stays species, series stays series.
In the 18th and 19th centuries, there was a strong movement to “Anglicize” these words. This is why we now accept “cactuses” alongside “cacti.” However, species has resisted this trend entirely. There is no accepted Anglicized plural like “specieses.” This is likely due to the word’s heavy use in the scientific community, which prizes Latin consistency.
Furthermore, the word species is related to the word specious (meaning superficially plausible but actually wrong) and spectacle. All these words come from the Latin root specere, meaning “to look at.” When you identify a species, you are essentially looking at its “appearance” to categorize it. This etymological connection highlights why the word’s form is so tied to its historical roots.
Practice Exercises and Quizzes
Test your knowledge with the following exercises. These are designed to challenge your understanding of subject-verb agreement and the singular/plural distinction of species.
Exercise 1: Fill in the Blanks
Choose the correct form (is/are, this/these, species/specie) to complete the sentences.
- Scientists believe that _________ (this/these) species of frog is extinct.
- How many _________ (species/specieses) of ants are in that colony?
- The treasury has a large reserve of gold _________ (species/specie).
- Every _________ (species/specie) in the park _________ (is/are) protected.
- Three different _________ (species/specie) _________ (was/were) observed.
- The _________ (species/specie) Canis lupus is known as the gray wolf.
- Are _________ (this/these) two species related?
- One _________ (species/specie) of bird _________ (mimic/mimics) other sounds.
- The extinction of a single _________ (species/specie) can affect the whole food chain.
- Many deep-sea _________ (species/specie) _________ (has/have) bioluminescence.
Exercise 2: Error Correction
Identify and correct the error in each of the following sentences. Some sentences may be correct.
- The biologist found a new specie in the jungle.
- There are several specieses of roses in the garden.
- This species of spider are very dangerous.
- Many species has adapted to urban environments.
- The series of experiments involved four species of mice.
- Each species have a specific role in the ecosystem.
- I am studying a rare species of orchid.
- The two species looks very similar to each other.
- We must protect all endangered species.
- The gold specie was kept in a secure vault.
Answers for Exercises
| Question # | Exercise 1 Answers | Exercise 2 Corrections |
|---|---|---|
| 1 | this | specie -> species |
| 2 | species | specieses -> species |
| 3 | specie | are -> is |
| 4 | species, is | has -> have |
| 5 | species, were | Correct |
| 6 | species | have -> has |
| 7 | these | Correct |
| 8 | species, mimics | looks -> look |
| 9 | species | Correct |
| 10 | species, have | Correct |
Frequently Asked Questions (FAQ)
1. Is “specieses” ever a correct word?
No, “specieses” is not a recognized word in standard English. While some people might use it in very informal speech, it is considered a grammatical error in all academic, professional, and formal writing. The plural of species is always species.
2. Why do we say “a species” if it ends in ‘s’?
In English, we are used to ‘s’ meaning plural, but many words end in ‘s’ in their singular form. Think of bus, lens, or gas. In the case of species, the ‘s’ is part of the original Latin root, not a plural suffix added later.
3. Can I use “specie” when talking about one animal?
No. Using “specie” to refer to a single organism is a common mistake. “Specie” refers specifically to coined money. If you are talking about biology, you must always use “species,” even for just one individual type.
4. How do I know if “species” is plural in a sentence?
Look for clues like the verb (is vs. are), the article (a/an vs. none), or numbers (one vs. many). For example, “A species is” is singular, while “Many species are” is plural.
5. Is “species” a collective noun?
It can function as one, but it is primarily a count noun. A collective noun refers to a group of individuals (like “herd” or “team”). A species refers to a biological category. You can have a “group of a species,” but the word species itself usually refers to the category/type.
6. What is the plural of “subspecies”?
Just like species, the word subspecies is invariant. The singular is “subspecies” and the plural is “subspecies.” For example: “This subspecies is rare” and “These two subspecies are rare.”
7. Does “species” always take a singular verb?
Only when it is used in the singular sense. When you are referring to multiple types, it takes a plural verb. “There are many species” is correct plural usage.
8. Is the “s” in species silent?
No, the “s” at the end of species is pronounced. It usually sounds like a “z” sound (/spiːʃiːz/) or sometimes a soft “s” (/spiːsiːz/), depending on regional accents. It is never silent.
Conclusion and Key Takeaways
Mastering the plural of species is a hallmark of a sophisticated English speaker and a precise scientist. The most important takeaway is that species is an invariant noun; it remains exactly the same in both its singular and plural forms. You should never use “specie” to describe an organism, nor should you ever use “specieses” to describe a group. Instead, rely on context clues—such as verbs, articles, and adjectives—to convey whether you are discussing one type of life or many. By paying attention to these small but significant details, you ensure that your communication is clear, professional, and scientifically accurate. Keep practicing with the examples provided, and soon using this “zero plural” noun will become second nature in your writing and speech.
