Flashcards in Eulipotyphla Deck (26)
What are the characteristics of the organisms in this group ?
Primitive, due to retention of ancestral eutherian features
Describe the eutherian brain.
It is small, with a smooth cerebrum
They are nocturnal. True or false ?
True, they have poor vision.
Describe the dental adaption of the Eulipotyphla
Many teeth, generally 44.
This is a retention of the ancestral eutherians.
Give 3 characteristics of the reproductive organs
Cloaca- Gametes, urine, faeces
Intra-abdominal testes- no scrotum (external sac)
What is the dental trend in most mammals ?
A decrease in teeth, Eulipotyphla buck this trend
Give the issues associated with a high surface area to volume ration
Rapid loss of heat
Some organisms require almost continuous food.
High Respiration rate
Give an example of a species with a particularly high surface area to volume ratio
Consume own mass in insects and worms each day
High resp. rate= 5000 cu/kg/hr
Humans= 200 cu/kg/hr
Give the families contained within this order.
Hedgehogs and moon rats
Moles and Desmans
How many sub families and species of shrew exist ?
3 sub families
Why do shrews emit ultrasonic clicks ?
As a crude form of echolocation.
Give the diet of shrews
Insects and other invertebrates
Venomous bite- enables immobilisation of larger items, frog,
Give the smallest terrestrial mammal and its weight
Pygmy white toothed shrew, 2g
Give a similarity between shrews and Solenodons.
Both in the order Eulipotyphla
Toxic saliva to immobilise prey
What is special about the snout of the Hispaniola Solenodon ?
Articulates with the skull via a ball and socket joint
List the threats to the critically endangered Solenodon.
introduction of rats, cats, dogs
Introduction of mongoose as bio control
How many species of moon rat and hedgehog exist ?
What are the spines of a hedgehog made from ?
They are modified hairs
Contraction of muscles at the base enable erection of spines
Give the disadvantages of spines to hedgehogs
Unable to effectively groom- covered in parasites.
Can be eaten by badgers and owls.
Temperate species of hedgehog are Heterothermic,
Mirror the environmental conditions
Reduce oxygen requirement to 2% of active level
Reduce heart rate 250bpm to 10bpm
How many species of moles and desmans exist ?
Give the main habitat niches of moles and desmans.
Why do moles tunnel ?
To enable worms and invertebrates to fall into the tunnels and be consumed
What does it say about the soil content if the mole tunnels are larger ?
The soil content is poor
Describe the sensory organs of moles.
Eimers organs (sensory) on muzzles
Vibrissae (whiskers) on muzzles, tails and legs of desmans.