ENWC424 Lecture Notes - Lecture 10: Egg Tooth, Boidae, Hydrophiinae

• School: University of Delaware
• Department: Entomology and Wildlife Conservation
• Course: ENWC424
• Professor: Nate Nazdrowicz

Document Summary

Lasts a few days to many months: renewal, cells begin dividing, move outward, and differentiate, milky fluid secreted between layers a few days prior to shedding. Infrared heat receptors: pythonidae, boidae, crotalinae receptor fields overlap to create stereoscopic infrared vision, auditory system, structure, outer ear = receives airborne sound, middle ear = extra columella-stapes pathway transfers sound from tympanum to inner ear. Lack outer ear: extra columella-stapes touches quadrate bone (skull) for transmission of vibrations, visual system, eyes, reduced, degenerate, or absent in fossorial species. Large and well developed in most reptiles: focusing, most vertebrates, change lens shape by muscle contractions, snakes, night vision. Lens moved away or towards subject: tapetumlucidum (cid:862)eye shine(cid:863, reflects light back to retina, only in crocodilians, chemosensory system: smelling and tasting, nasal organs, system of cavities and chambers, olfaction, external and internal nares connect nasal cavity.