Animal Diversity Part 5 Crustaceans

Named for the hard exoskeleton

Crustacea

How many living species of subphylum crustacea are there?

over 67,000 living species

Do crustacea fill a variety of ecological roles and show enormous morphological characteristics?

Yes crustacea does

Insects and crustacea make up over ___ of all named animal species?

80%

What is the main distinguishing characteristics of crustaceans that they have?

Two pairs of antennae

The head of a crustacean has a pair of _____ and two pairs of _____

Mandibles & Maxillae

All appendages except for first antennae are?

Biramous ( they have two main branches)

In most crustacea, one or more thoracic segments are fused with?

the head as a cephalothorax

Crustacea muscular and nervous system shows segmentation of ?

Annelid-like ancestors

What remains as end sacs of excretory organs and gonads in Crustacea?

Coelomic Compartment

Are arthropods coelomates?

They are only in the technical sense of the term

Do crustaceans and other arthropods have an “open” circulatory system?

Yes

____ makes up a major portion of the crustacean body?

Striated Muscles

Most of crustacean muscles are arranged as ____??

Antagonistic groups - flexers draw a limb toward the body and extensors straighten a limb out

Smaller crustaceans may exchange gases across ____ on their appendages?

Thin areas of cuticle

Larger crustaceans use ____ for gas exchange

Featherlike gills

Crustaceans gills may project?

the pleural wall into gill cavity, the articulation of thoracic legs moves water across gill

The antennal glands in crustacean are called?

Green glands

In crustaceans _____ are secreted across thin ares of cuticle in the gills (simple diffusion into water)

Nitrogenous wastes like ammonia

Compared to annelids, the nervous system of crustaceans has more ?

Fusion of ganglia

What is the largest sensory organ in crustaceans?

The eyes

Where does the chemical sensing of taste and smell occur in crustaceans?

Taste and smell occurs in hairs on antennae, antennules, and within mouthparts

Crustaceans eyes are compound made of many units called?

Ommatidia

In bright light each ommatidium sees a restricted visual resulting in?

A mosaic image

In dim light, distal and proximal pigments separate to produce a ?

Continuous image

What is the largest subphylum of crustacean?

Class Malacostraca

How many species are in Class Malacostraca

20,000 species

The class. malacostracta contains three subclass & how many orders?

14 orders

What is the only true terrestrial crustaceans?

Order Isopoda

Does order isopoda have marine and freshwater forms as well?

Yes they have marine and freshwater forms

What is the common landforms of order isopoda?

The sow bugs and pill bugs

Some isopods are highly modified as ???

Parasites and fishes or crustaceans

Order decapoda have five pairs of walking legs and ___ pairs of maxillipeds?

three

In crabs the first pair of walking legs form of?

Pinchers

Order Decapoda has the larges arthropoda ?

A Japanese crab with 4 meter leg span

How many species in Order Decapoda?

There is 18,000 species known

What animals primarily make up Order Decapoda?

Crayfish, lobsters, crabs, and true shrimp

What is the dominant arthropod in marine enviroment?

Crustaceans

What class if the most diverse and members of class copepoda are most abundant?

Class malacostraca and class copepoda most abundant