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Tunicates - Introduction to Biology - Lecture Slides, Slides of Biology

Gujarat Ayurved University Biology

These are the lecture slides of Introduction to Biology. Key important points are: Tunicates, Phylum Chordata, Characteristics of Chordates, Tunicate Larvae, Adult Tunicate, General Features Shared by Chordates, Styela Montereyensis, Subphylum Urochordata, Free Swimming Larva

Typology: Slides

2012/2013

Uploaded on 01/18/2013

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Phylum Chordata

Subphylum Urochordata

Subphylum Cephalochordata

Subphylum Vertebrata

tunicates lancets Agnathans Fish Sharks tetrapods

1 st^ fish

Proto-vertebrate

Tunicate larvae Adult tunicate

lancelet

Possible evolution of 1 st^ fish

Pikaia Burgess Shale Fauna Cambrian 540-500 mya

Early Chordate ancestor may have given rise to 1 st^ vertebrate

Phylum Chordata

Subphylum Urochordata - Tunicates

Class Ascidiacea - Sea Squirts

Solitary e.g. Styela montereyensis

Colonial - in groups but with own tunic

Compound Colonial - colonial with shared

tunic

Class Thaliacea - Salps (free swimming),

planktonic

Class Larvacea - Gelatinous house, planktonic

Subphylum Urochordata = tunicate

Tunicate - also called 'sea squirt'

notochord is confined to the tail
notochord is lost during metamorphosis

into sessile adult

possess pharyngeal slits
Repro- sexual (hermaphroditic) &

asexual (budding)

Oikopleura

Jelly-like house

Marine snow

Class Larvacea - Gelatinous house, planktonic