Lecture 5 (Caecilians)
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29 Terms
What order do the Caecilians belong to?
Gymnophiona
How many extant species belong in the subclass Lissamphibia?
6380+
What is the geographic distribution of Gymnophiona?
Tropical and equatorial
How many families/genera/spp are in Gymnophiona?
-10 families
-35 genera
-189 spp
Where are caecilians found?
They are terrestrial, fossorial, or aquatic.
Gymno means?
Naked
Ophios means?
Snake
Describe the limbs, girdles, and tails of caecilians
Absent
What unique structure do caecilians posses on their heads and what is its function?
A protrusible tentacle that’s used for chemosensory.
For every one body annuli/costal groove caecilians have one?
Vertebrae
What is the Jacobson’s organ?
A pheromone detecting organ on the roof of the mouth
Describe the skull of caecilians.
Ossified and simple. Teeth on both jaws.
Caecilian skulls are ______ which means there is little movement.
Akinetc
What are the to types of kinesis in caecilian skulls and which one is most primitive?
Zygokrotaphy- Little movement. Most primitive.
Stegokrotaphy- No movement.
What type of skull suspension do caecilians have?
Streptostylic
What are caecilian scales made of?
Collagenous fibers and minerals
What is the name of caecilian’s copulatory organ?
Phallodeum
What are the unique larval structures of caecilians?
External gills and a lateral line system
The family Chikilidae is from?
Garo tongue india
Chikilidae was the ____ family identified.
10th.
Describe the teeth of chikilidae.
Two rows on the lower jaw
Describe chikilidae annuli
Primary and secondary annuli with scales
Are chikilidae oviparous or viviparous?
Oviparous
Where is the family Rhinotrematidae from and how many genera and species are there?
-Northern South America.
-2 genera, 11 spp
Where is the family Ichthyopiidae from and how many genera and species are there?
-Asia
-3 genera
-50 spp
Where is the family Uraeotyphilidae from and how many genera and species are there?
-India.
-1 genus
-5 spp.
Where is the family Scolecomorphidae from and how many genera and species are there?
-Africa
-2 genera
-6 spp
Where is the family Typhlonectidae from and how many genera and species are there?
-South America
-5 Genera
-13 spp
Where is the family Caecilidae from and how many genera and species are there?
-South America
-2 genera
42 spp