Order insectivora
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Transcript of Order insectivora
![Page 1: Order insectivora](https://reader035.fdocuments.net/reader035/viewer/2022062514/558a1c19d8b42ad7618b4744/html5/thumbnails/1.jpg)
ORDER INSECTIVORASYNONYMOUS TO
ORDER EULIPOTPHYLA
DIVIDED INTO
ORDER ERINACEOMORPHA + ORDER SORICOMORPHA
(HEDGEHOGS) (MOLES, SHREWS, SOLENODONS)
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INSECTIVORA
Subsist on a diet of insects, worms, and other small invertebrates
Relatively abundant in the past; represented today by a few survivors
Moles, shrews, hedgehogs – represent examples of convergent feeding strategies
-burrowers and diggers
-hunt for insects living in soil and in organic matter that sits atop the soil
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Insectivores vary greatly in appearance. They typically have a long snout, as evidenced by most moles, shrews, and solenodons. Some are covered in a mouse-like fur with a hairy, smooth tail, others are covered in spines and lack tails entirely.
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Most insectivores have an excellent sense of smell, touch, and hearing, but have a poor sense of sight. They live in a wide variety of habitats, from streams to open meadows to deep underground.
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PRIMITIVE TRAITS OF INSECTIVORES
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FLAT-FOOTED (PLANTIGRADE) STANCE
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FIVE TOES
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SMOOTH CEREBRAL HEMISPHERES
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SMALL SHARP POINTED TEETH WITH INCISORS, CANINES, AND PREMOLARS POORLY DIFFERENTIATED
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PRIMITIVE INTERNAL FEATURES
Most insectivores lack a separate opening for the genitals and anus, and instead have a cloaca, which serves as the genital, urinary, and fecal system.
Large embryonic allantois and yolk sac
In some genera, testes are retained in the abdominal cavity
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HEDGEHOG (ERINACEOMORPHA)
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MOLES (SORICOMORPHA)
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SHREWS (SORICOMORPHA)
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SOLENODONS (SORICOMORPHA)