Domain Protista

The Kingdom Protista are a ‘paraphyletic’ group!

(Paraphyletic = consists of all the descendants of the last common ancestor of the group's members)

 

The Basics;

Mobile or stationary

 Most are unicellular, some multicellular

Autotrophs or heterotrophs, or both.

 

 

A mobile Protista

Both ASEXUAL and SEXUAL reproduction

Simple plasma membrane or stiffer structure (cell wall, internal shell)
Many contain endosymbionts

CHARACTERISTICS;

• Moist habitats
• Many single celled, some clonal, some multicellular (or colonial)
• Some mobile, other stationary
• Important in nitrogen cycling and in various carbon and nitrogen cycles
• Some important human parasites and pathogens

 

GROUPING;

Often grouped by ecological role;

1. Algae
2. Protozoa
3. Fungus- like

CLASSIFICATION BY BROAD 'SUPERGROUPS'

Excavata
Archaeplastida
Euglenozoa
Rhizaria
Stramenopila
Amoebozoa
Alveolata
Opisthokonta
Chromalveolata etc.

Movement;

Attached to surfaces and mobile;
Free-floating species sometimes grouped together as the plankton

• Ciliates: ciliated, move using cilia
•  Flagellates: flagellated, move using flagella
• Amoeboid: amoebae, move using pseudo-podia
• Slide, using carbohydrate or protein slime

 

Chlorophyta

Is one of the largest groups of green algae. Most aquatic, some terrestrial.

Pediastrum boryanum

Domain: Eukaryota

Kingdom: Protista

Division: Chlorophyta

Class: Chlorophyceae

Order: Chlorococcales

Family: Hydrodictyaceae

Genus: Pediastrum

Species: Pediastrum boryanum




Origin of different morphologies and multicellular bodies.....

Pediastrum boryanum