Scoliodon Taboos
EXTERNAL ANATOMY OF GNATHOSTOMES
A. CLASS CHONDRICHTHYES: Scoliodon palasorrah (DOGFISH)
-class of cartilaginous or elasmobranch
-cartilaginous skeleton
-exposed gill slits
2 common species for lab dissection: * Squalus acanthias –Atlantic spiny dog * Squalus suckleyi – Pacific spiny dog
PARTS: 1. Body and skin * Body, SPINDLE SHAPE, advantageous for free- swimming animals * Body, pointed at each other a. TRUNK AND TAIL – provide fins for locomotion b. BODY- clothed with SCALES (each of which bears a tiny spine * Rough feeling of skin caused by the spines * LATERAL LINE – whitish line, along each sides of the body; * Lateral line overlies the LATERAL-LINE CANAL –with …show more content…
*TOAD AND FROG ARE DISTINGUISHED from EACH OTHE by THEIR SKELETON and the appearance of WARTY, SQAUTTY ANIMAL with a pair of PAROTOID GLANDS for the TAOD.
E. CLASS REPTILIA
- distinguished by their DRY SCALY SKIN
-GILLS are LACKING in all stages
1. LIZARDS (order Squamata, suborder Lacertilia)
-body is tetrapod in form
- Divisible into HEAD, NECK, TRUNK AND LONG TAIL.
*AMPHIBIANS AND FISHES, LACK A DISTINCT NECK
-BODY: clothed with HORNY SCALES, PLATES and TUBERCLES (which are not detachable structures and are merely cornified thickenings of the EPIDERMIS)
-EYES: movable upper and lower eyelids.
NICTITATING MEMBRANE- 3rd eyelid
-CONSPICUOS EAR
-MIDDLE EAR- lacks in fishes and salamanders
- Modified translucent scale – has histological structure if an eye and might serve some OPTIC FUNCTION.
*Skin folds are common in lizards on throat, neck, side of trunk or mid-dorsal line. Often these can be erected and are then displayed in courtship or combat. They may be limited to male sex
-DEWLAP- a fan that is red in color because the red throat skin shows between the scales.
Much LAREGR IN MALE than in …show more content…
Cat and rabbit * PLANTIGRADE- walks on SOLE FOOT
Ex. Human * UNGULIGRADE- use of NAILS
Ex. Horses and cattle and other ungulates
-NO CLAOCA
-ANAL and UROGENITAL OPENINGS are SEPARATE
*the region which includes these openings is termed PERINEUM
-ANUS –located on the midventral line
-PERINEAL SPACE or INGUINAL – found on each side of the anus, a deep hairless depression (found in rabbits)
-INGUINAL GLAND- not visible externally. Source of ODORIFEROUS SECRETION
-GREATER LIPS or LABIA MAJORA – fold of skin found in female urogenitals
(VULVA- opening)
-PENIS or ORGAN OR COPULATION – in front of the anus
-SCROTUM or SCROTAL SAC- double pouch which houses the TESTES
- PREPUCE or FORESKIN- fold of skin in cats
*Cat’s penis –invisible enxternally
*the UROGENITAL in MOST MALE MAMMALS is on the TIP of the PENIS (for copulation and urine discharge)
2. PRIMITIVE MAMMALS
-MONOSTREMES
* PLATYPUS * SPNIY ANTEATERS
-adapted for ant-eating by means of CLAWED FEET for OPENING THE NESTS and a long pointed snout and extensile
A. CLASS CHONDRICHTHYES: Scoliodon palasorrah (DOGFISH)
-class of cartilaginous or elasmobranch
-cartilaginous skeleton
-exposed gill slits
2 common species for lab dissection: * Squalus acanthias –Atlantic spiny dog * Squalus suckleyi – Pacific spiny dog
PARTS: 1. Body and skin * Body, SPINDLE SHAPE, advantageous for free- swimming animals * Body, pointed at each other a. TRUNK AND TAIL – provide fins for locomotion b. BODY- clothed with SCALES (each of which bears a tiny spine * Rough feeling of skin caused by the spines * LATERAL LINE – whitish line, along each sides of the body; * Lateral line overlies the LATERAL-LINE CANAL –with …show more content…
*TOAD AND FROG ARE DISTINGUISHED from EACH OTHE by THEIR SKELETON and the appearance of WARTY, SQAUTTY ANIMAL with a pair of PAROTOID GLANDS for the TAOD.
E. CLASS REPTILIA
- distinguished by their DRY SCALY SKIN
-GILLS are LACKING in all stages
1. LIZARDS (order Squamata, suborder Lacertilia)
-body is tetrapod in form
- Divisible into HEAD, NECK, TRUNK AND LONG TAIL.
*AMPHIBIANS AND FISHES, LACK A DISTINCT NECK
-BODY: clothed with HORNY SCALES, PLATES and TUBERCLES (which are not detachable structures and are merely cornified thickenings of the EPIDERMIS)
-EYES: movable upper and lower eyelids.
NICTITATING MEMBRANE- 3rd eyelid
-CONSPICUOS EAR
-MIDDLE EAR- lacks in fishes and salamanders
- Modified translucent scale – has histological structure if an eye and might serve some OPTIC FUNCTION.
*Skin folds are common in lizards on throat, neck, side of trunk or mid-dorsal line. Often these can be erected and are then displayed in courtship or combat. They may be limited to male sex
-DEWLAP- a fan that is red in color because the red throat skin shows between the scales.
Much LAREGR IN MALE than in …show more content…
Cat and rabbit * PLANTIGRADE- walks on SOLE FOOT
Ex. Human * UNGULIGRADE- use of NAILS
Ex. Horses and cattle and other ungulates
-NO CLAOCA
-ANAL and UROGENITAL OPENINGS are SEPARATE
*the region which includes these openings is termed PERINEUM
-ANUS –located on the midventral line
-PERINEAL SPACE or INGUINAL – found on each side of the anus, a deep hairless depression (found in rabbits)
-INGUINAL GLAND- not visible externally. Source of ODORIFEROUS SECRETION
-GREATER LIPS or LABIA MAJORA – fold of skin found in female urogenitals
(VULVA- opening)
-PENIS or ORGAN OR COPULATION – in front of the anus
-SCROTUM or SCROTAL SAC- double pouch which houses the TESTES
- PREPUCE or FORESKIN- fold of skin in cats
*Cat’s penis –invisible enxternally
*the UROGENITAL in MOST MALE MAMMALS is on the TIP of the PENIS (for copulation and urine discharge)
2. PRIMITIVE MAMMALS
-MONOSTREMES
* PLATYPUS * SPNIY ANTEATERS
-adapted for ant-eating by means of CLAWED FEET for OPENING THE NESTS and a long pointed snout and extensile