Phylum antropoda-zoology

Prepared By: Maglasang, Mary Grace C.

What is Phylum Arthropoda?

From the greek (arthron, joint, +pous, podos, foot)

It includes spiders, scorpions, ticks, mites, crustaceans, millipedes, centipedes, insects and other less well-known groups.

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General Characteristics

The most species-diverse phylum in the animal kingdom.

60 cm in length and most are much smaller.

Usually active and energetic animals.

Eukaryotic phylumJointed legs

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Mode of NutritionThey utilize all modes of feeding.CarnivoryHerbivoryOmnivoryMost are herbivorousMany aquatic antropods are

omnivorous.

Reproductionmost arthropods are normally sexual and

gonochoristic, but can be parthenogenetic. fertilization may be external or internal in aquatic

arthropods always internal in terrestrial species

Sperm Transfer sperm transfer usually by mating or copulation females usually store the sperm in a seminal

receptacle

LocomotionThey can fly.SwimCrawl

HabitatLive everywhere.AirLandFresh brackish and

marine water

Scientific classification

Classification

Phylum ArthropodaSubphylum Trilobita (extinct)

Subphylum ChelicerataSubphylum Crustacea

Subphylum Uniramia (insects)

Subphylum Trilobita

Subphylum Trilobita

Trilobita refers to the trilobed shape of the body in cross section, caused by a pair of longitudinal grooves.

Most of them are scavengers.

General Description

Trilobites had three main body regions: Head apparently composed of four fused

segments, bearing a pair of antennae and, sometimes, compound eyes;

Thorax with a variable number of separate segments.

Abdomen consisting of several fused segments.

Everything we know about Trilobites therefore is derived from fossils, nobody has ever seen a live one.

2 to 7 cm in length. exclusively marine animals

General Description

Mode of Nutrition

Some trilobites were active predators, whereas others were scavengers, and still others probably ate plankton.

Habitatthe seas of the worldMarine animals

LocomotionSwimming

Crawling

Reproduction the female simply releases

its eggs into the open water and the male follows suit by releasing its sperm.

the male uses a specialized pair of appendages on its abdomen, the so-called "pleopods", to transfer its sperm to the female.

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