Classification: Classifying entails grouping things into categories based on comparable characteristics. Insects, favor all life organisms, have the right to be classified follow to their phylogenetic relationships. The group system used by scientists requires a hierarchy start with a wide category and also ending through a very particular category. In science, us classify organisms according to kingdom, phylum, class, order, family, genus, and also species.

You are watching: Select all of the characteristics that apply to members of phylum arthropoda.

Nomenclature: Nomenclature refers to the naming of organisms. Every organism is provided a name consisting of 2 words referred to as the clinical name. The very first word represents the genus and the 2nd the species. Clinical names room Latin and are either printed in italics or underlined if handwritten. The scientific name for the honey punishment is Apis mellifera.

Identification of Insects and their Relatives: Insects are component of the phylum of animals called Arthropoda. Every arthropods posses one exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages. The significant arthropod classes have the right to be separated by compare their variety of body regions, legs, and antennae.


Major outside Characteristics

1. Exoskeleton include chitin

2. Human body bilaterally symmetrical

3. Human body segments grouped into devoted regions (= tagmata, plural)

4. Jointed appendages

5. These jointed appendages variously dedicated for feeding, locomotion, sensing

Key come the adult of the usual Classes of Arthropoda

1a. Two pairs that antennae (one pair might be reduced, complicated to see);

Number of foot variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class Crustacea, go to 2

1b. One pair the antennae or none. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .go to 3

2a. Two distinctive body regions (cephlothorax and also abdomen);

Five bag of thoracic legs. . . . . . . . . . . . . . . . . Crayfish, lobsters, shrimp; Order Decapoda

2b. Three distinct body regions (head, thorax, abdomen);

Seven bag of thoracic foot . . . . . . . . . . . . . . Sowbugs, pillbugs, roly-polys; Order Isopoda

3a. No antennae; Two unique body areas (cephlothorax and abdomen);

Four bag of legs;. . . . . . . . . . . . . . . . . . Spiders, ticks, scorpions, etc; Class Arachnida

3b. One pair of antennae. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4a. Three distinct body areas (head, thorax, abdomen);

Three bag of thoracic legs. Wings present or absent. . . . . . . . . . . . . . Class Insecta

4b. Two distinct body regions (head and also trunk). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

5a. One pair of legs per trunk segment. . . . . . . . . . . . . . . . . . . . . .centipedes; Class Chilopoda

5b. 2 pairs the legs per trunk segment. . . . . . . . . . . . . . . . Millipedes; Class Diplopoda


Class Crustacea (crus-ta-ce-uh), the crustaceans. This is a very diverse class. Its members screen much sport in the tagmata and also the appendages. There are about 30,000 species of Crustacea. Most are aquatic, the bulk of which space marine. Crustaceans includes lobsters, crabs, crayfish, shrimp, barnacles, and several less acquainted forms. Among the last is the Isopoda, the sowbugs and pillbugs or roly-polys. Most human being will likely encounter just two orders, the orders Decapoda and Isopoda.

Order Decapoda (dec-o-po-da). Lobsters, crayfish, crabs, shrimp.

Two tagmata (cephlothorax and abdomen)

Two bag of antennae (can be complicated to watch both pairs) Five bag of legs top top the cephlothorax, the first pair usually v a big claw

Order Isopoda (eye-so-po-da). Sowbugs, pillbugs, roly-polys.

Three tagmata (head, thorax and abdomen)

Two pairs of antennae: very first pair is greatly reduced , rarely noticed

Seven pairs of legs, one pair on every thoracic segment

Abdomen small, an ext or much less fused.

Most isopods space marine, life in seaweed and also under stones in the water. There are a couple of freshwater forms. The just Crustacea to invade the land room the isopods However, they have not severed every ties v the aquatic habitat for they are only discovered in locations of high moisture. This has places such together leaf litter and also soil and also beneath bark and also stones. A couple of are sometimes pests of grew plants, but they normally feed on essential debris. Those that have the right to roll right into a sphere are dubbed pillbugs or roly-polys; those that deserve to not form a ball room the sowbugs.


Class Arachnida (uh-rak-nid-uh), spiders, ticks, mites, scorpions and also others. This is a diverse course which belongs come a subphylum the the Arthropoda known as the Chelicerata. Chelicerata are defined as having two unique body regions, a cephlothorax and an abdomen. Chelicerates have actually six bag of appendages, the very first two pairs being mouthparts and also the adhering to four pairs being legs. They do not have antennae.

The first pair that mouthparts room the chelicerae (sing., chelicera). They space three-segmented and pincher-like. In spiders, the terminal 3rd segment is often dubbed a fang. The 2nd pair the mouthparts space the six-segmented pedipalps. Castle may show up leg-like (spiders) or claw-like (scorpions). The foot of many Chelicerata have seven segments. Contrasted to insects, whose legs have actually six segments, there is one extra segment, dubbed the patella, between the third segment (the femur) and the 4th segment (the tibia). Usual orders that Arachnida include:

Order Araneae (a-ran-e-uh), the spiders.Two tagmata (cephlothorax and abdomen)

No antennae

Abdomen joined to cephlothorax by slim pedicel

Four bag of legs

Mouthparts: One pair chelicerae and also one pair the pedipalps

Eyes basic ocelli. Commonly eight, occasionally fewer

Poison apparatus opens up on the fangs of the chelicerae

Silk apparatus always present at end of abdomen, below anus

This is a big order, having around 2500 species in north America. Although nearly all spiders have venom glands, spiders hardly ever bite man. Just a couple of U.S. Species are taken into consideration dangerous. In Nebraska, the black widow and the brown recluse are the only seriously awful spiders

Order Acari (ak-a-ri), the mites and ticks.

Two tagmata (cephlothorax and also abdomen)

No antennae.

Abdomen extensively joined to cephlothorax (no pedicel).

Four pairs of legs in adults; only three bag at hatching

Ticks and mites happen just about anywhere pet life is found. They might be terrestrial or aquatic, free-living or parasitic.They might feed on necessary debris (beneficial scavengers) or on life plants or animals. Some of the tree feeders are serious pests that crops. Several of the parasitic creates are pests of animals and also man. Some room vectors the diseases. A couple of of the predatory and parasitic mites are thought about beneficial because they feeding on insects or various other pests. End 30,000 types of ticks and also mites have been described.

Order Scorpiones (scor-pi-on-es), the scorpions.

Two tagmata (cephlothorax and abdomen)

No antennae

No pedicel between cephlothorax and also abdomen

Four bag of legs on cephlothorax

One pair that chelicerae and also one pair of long, pincher-like pedipalpsAbdomen through seven vast segments anteriorly, complied with by five narrower segment which end with a huge stinger.

Scorpions feed mainly on insects and also spiders which they record with your pedipalps. They may or might not sting your prey. Scorpions execute not ordinarily attack man, yet they will sting if disturbed or cornered. That the forty-some species that occur in the U.S., the sting of most is painful, yet not dangerous. One Arizona species, however, is really venomous, and also its sting deserve to be fatal.


Class Chilopoda (chi-lo-po-da), the centipedes.


Two tagmata (head and trunk) One pair that antennae through 14 or much more segments

One pair the legs per trunk segment.

Mouthparts: one pair that mandibles and two bag of maxillae

Appendages top top the an initial trunk segment room clawlike toxicity jaws or fangs with which centipedes paralysis their prey.

The course name describes the lip- choose appearance the the unify bases of this appendages.

Eyes might be present or absent.

Centipedes space elongate and also flattened. They space usually found in somewhat protected places, such as in sheet litter, in the soil, under bark, or in rotten logs. One types is generally found in houses and other buildings. Centipedes room predatory and feed on insects, spiders, and other tiny animals.The bigger centipedes can bite humans, yet the bite is no serious and also is no much more painful that the sting the a punishment or wasp. The common little centipedes of Nebraska room harmless come man. Overall, centipedes are valuable natural enemies of insects.


Class Diplopoda (dip-low-po-da), the millipedes.


Two tagmata (head and trunk)

One pair that antennae, usually having seven segments

Two bag of legs on many trunk segments (30 or an ext pairs total)

Mouthparts: one pair the mandibles, and also one pair the maxillae

Eyes space usually present

Millipedes room usually cylindrical (sometimes slightly flattened). Except for the very first three tribe segments, each segment has two bag of quick legs. Millipedes are discovered in damp locations such as the soil, leaf litter, or under logs and stones. Many millipedes are beneficial scavengers of decaying tree material. A few attack living plants and are periodically pests. Even fewer room predacious. Millipedes perform not bite man, yet many give off a foul-smelling fluid containing hydrogen cyanide which have the right to be strong enough to kill insects placed in a jar with a millipede.


Class Insecta (in- sec-ta), the insects.

See more: 10 Year Old Boobs Will Look Throughout Your Lifetime, My Nine Year Old Is Growing Boobs

Three tagmata (head, thorax and also abdomen)

One pair of antennae

Three bag of legs

May have actually wings, one of two people one or 2 pairs

Insects room the many abundant life form now known to science. Approximately 1,000,000 species have to be described and also named. That is much more than every the other known animals put together.