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Noah Hadfield

on 10 February 2015

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Transcript of Ecdysozoans

What They Is
Member of a group of animals phyla identified as a clade by molecular evidence and which are usually molting animals.
Don't have segmented bodies
Cylindrical bodies range from <1mm to 1m
Body wall muscles all longitudinal, contractions produce thrashing motion
Reproduce sexually by internal fertilization
Parasitic nematodes have a molecular "toolkit' that enables them to rediriect cellular functions of the host and invade their immune system
Zoologists that there are about 10^18 arthropods on earth
More than 1 million arthropods have been described, most of which are insects
Found in nearly all habitats in the biosphere
Arthropd Origins
Arthropods today have two unusual Hox genes which both influence segmentation
Diversity in arthropods may have been driven by changes in the sequence or regulation of existing Hox genes
Arthropod Characteristics
Segmented Bodies
Well-developed sensory organs
Open circulatory system
Consist of four major lineages- Cheliceriforms, Myripods, Hexopods, Crustaceans
Claw-like feeding appendages
An anterior cephalothorax
Posterior abdomen
No antenna
Simple eyes
Earliest forms were eurypterids
majority of modern Cheliceriorms are arachnids
Most spiders have book lungs- stacked plate like structe contained in an internal structure
Includes millipedes and centipedes
Pair of antennae
Three pair of appendages modified as mouth parts, including jaw like mandibles
A lot of legs
Each trunk segment is formed from two fused segments and bears two pairs of legs
More species than all other life forms combined
All most every habitat has insects
Flight is part of its great success
Many undergo metamorphosis
Usually reproduce sexually
Fertilization is usually internal
Often lay eggs
Usually marine and fresh water enviroments
Typically highly specialized appendages
Two pairs of antennae
Three or more pairs of appendages maidfied as mouth parts, including hard mandibles
Walking legs present on thorax and abdomen
Appendages on abdomen
Lost appendages can be regeneration during molt
Specialized pair of abdominal appendages to transfer sperm
Full transcript