Exotics Flashcards
Describe the main characteristics of the order Crocodilia.
- Crocodiles, alligators, caimans, gharials, 23 species
- Amphibious, reproduce on land
- Diet = carnivorous
- 4-legged, semi-aquatic
- Large - 1-9 meters, several 100kgs
- Oviparous - dig nest sites
- Osteoderm (osteoscutes) - plates of bone in dermis under scales
Describe the main characteristics of the order squamata.
- Snakes and lizards, 3000+ species
- Freshwater and marine aquatic, terrestiral, subterranean, arboreal
- Diet - herbivorus, insectivorous, carnivorous
- 4-legged to legless, body covered with scales
- Variable eyelids and external ears, **edysis **(shedding)
- Oviparous or ovoviviparous
- Some species are venomous
Describe the main characteristics of the order testudines.
- Tortoises and terrapins, 244+ species
- Terrestrial, amphibious, marine
- Diet - herbivores, omnivores
- Protective shell (carapace, plastron)
- Horny beak, limb variation for habitat (i.e. webbed or not)
- Oviparous on land
- Long-lived 50-100 years
Describe the main characteristics of the order sphenodontia.
- Tuataras, over 200+ million years old
- 2 species - sphenodon punctatus and S. guntheri
- Endemic to 20 islands off new zealand
- Diet - insectivorous, small birds
- Lizard-like reptial, parietal eye on head
- Oviparous, nocturnal
- Prefers low environmentla temperature (55-70F)
- CITES protected species
Describe the housing requirements for reptiles.
- Appropriate for species
- Aquarium, terrarium, vivarium
- Thrermal gradient
- Temp and humidity variable
- Natural or UV light
- Hiding place
- House singly, aggression
- Escape-proof (especially arboreal spp)
Describe the important of lighting for replites.
- Repltiles require full spectrum UV light for vitamin D synthesis and calcium metabolism (»herbirous or omnivorus species)
- Natural sunlight > artificial
- UV doesnt penetrate glass or plastic!
- 18-22 inches from reptile
- 12-18 hours of exposure (1-4 hours natural light)
Describe nutritional requirements for reptiles.
- Appropriate for species
- Adult vs juvenile may differ slightly
- Avoid feeding live prey (inhumane, injury)
- Artificial diets - depends on species
Generally:
* 1x/ 2 weeks for large snakes
* 1-2x/week for msot snakes, lizards, and crocodilia
* 2-3x / week for iguanas, aquatic turtles
* 5-7x/week for lizards, turtles, tortoises, and all juveniles
What are the major infectious diseases of reptiles (7)?
- Paramyxovirus
- Inclusion Body Disease (IBD, virus)
- Ulcerative Stomatitis (bacteria)
- Pneumonia (bacteria)
- Salmonella
- Mycobacteriosis
- External and internal parasites
Describe paramyxovirus in reptiles.
- Acute respiratory disease in snakes, epizootics
- Often complicated by secondary bacterial infections
- Dx = postmortem
- Quaratine 9- days, check PMV titers
- Hemorrhage of lungs in snake
Describe Inclusion Body Disease in reptiles.
- Retrovirus-like RNA virus
- Pathogen of boid snakes (constrictors, boas > pythons)
- Causes encephalities and flaccid paralysis
- Dx = eosinophilic intracytoplasmic inclusions
- Tx = none, euthanasia recommended
Describe ulcerative stomatiits in reptiles.
- Mouth rot, infectious stomatitis
- Secondary to poor husbandry/management
- Associated w aeromonas/pseudomonas
- Reluctance to eat, inflammation, ulcers, abscesses
- Tx = debride, topical and systemic antibiotics, husbandry
Describe pneumonia in reptiles.
- Severe resp disease in snakes and turtles
- Aeromonas, pseudomonas, klebsiella, proteus
- Secondary to paramyxovirus infection
- Resp distress, audible breathing sounds, nasal bubbling, open-mouth breathing, listing to one side in water (turtles)
- Dx = tracheal swab, tracheal wash, rads
- Tx = systemic antibx, improve husbandry, supportive care, isolation
Describe salmonella in reptiles.
- Normal intestinal flora
- Usually sublinical infection that manifests when stressed
- Acute enteritis, septicemia, pneumonia, death
- Zoonotic! (esp turtles) –> why FDA banned <4inch
Describe mycobacteriosis in reptiles.
- Non-tubercular - M. marinum, cheloni, ulcerans
- Ubiquitos in environment and water
- Nodular lesions on extremities and internal organs
- Zoonotic potential
Describe parasites in reptiles.
- More common in wild species, can occur in captive reptiles with poor husbandry
- Enteritis, anemia, skin lesions
- Mites - ophionyssus sp (scale mites)
- Ticks - amblyomma, ornithodorus
What are non-infectious diseases in reptiles (6)?
- Metabolic Bone Disease
- Hypovitaminosis A
- Dysecdysis
- Follicular Stasis/Dystocia
- Gout
- Trauma
Describe metabolic bone disease in reptiles.
- Secondary hyperparathyroidism and nutritional osteodystrophy
- Imbalance of Ca+P ration (1.2:1 rec)
- Due to improper diet or inadequate UV light
- > herbivores and omnivores
- Lethargy, anorexia, lameness, swollen joints, scoliosis, kyphosis, shell deformations (longer time)
- Dx = clinical signs, rads (bone lysis), diet analysis
- Tx = correct diet, provide UV light, parenteral Ca –> might not fix deformations
Describe Hypovitaminosis A in reptiles.
- Most common in pet aquatic turtles, also box turtles w otitis media
- Conjunctivitis, palpebral edema, otitis, blepharitis, overgrowth of horney mouth parts, respiratory disease
- Squamous metaplasia of epithelial cells
- Dx = clincial signs
- Tx = parrenteral Vit A, correct diet, tx 2 infections
Describe dysecdysis in reptiles.
- Incomplete or retained shed skin/spectacles
- Can result in unintentional aggression and strinking
- Usually secondary to low humidity, poor nutrition, etc.
- Tx = misting/soaking, physical removal
Describe follicular stasis/dystocia in reptiles.
- Egg bound or retained eggs
- Causes vary - improper diet or temperature, cracked eggs, repro infection, systemic infection
- Anorexia, lethargy, abdominal distension, restlessness
- Dx = history, palpation, rads, US
- TX = supportive care, oxytocin, ocariectomy
Describe gout in reptiles.
- Caused by excess protein, various drugs, and water deprivation
- Uric acid accumulation in various tissues
- Visceral gout = tubular damange in kidney
- Articular gout = swollen joints, painful
- Dx = history, palpation, rads
- Tx = reduce protein, increase water availability
Describe causes of trauma in reptiles.
Thermal injuries, bite wound with secondary bacterial infection
What are the important zoonotic diseases of reptiles (4)?
- Aeromonas spp
- Pseudomonas spp
- Salmonella spp
- Mycobacterium spp
Describe the characteristics of the class Amphibia.
- Carnivorous as adults, herbivorous when young
- Two-stage life cycle
- Respire through skin, have lungs
- 3 chambered heart
- Large nucleated RBCs
- External fertilizaiton, lay eggs
- Some sexually dimorphic
- Difficult to determine gender in most species without breeding condition
Describe the characteristics of the order anura.
- Frogs and toads
- Tailless adults, well-developed hind limbs
- Aquatic and terrestial forma
- Frogs = aquatic, moist skin
- Toads = terrestrial, dry skin
- Egg –> tadpole –> adult
- External fertilization, larval metamorphosis
Describe the characteristics of the order caudata.
- Salamanders and sirens
- Moist-skinned, long-tailed, slender
- Salamanders = semi-aquatic
- Newts = aquatic group of salamanders
- Sirens = lack legs
- Internal fertilization, eggs deposited singly in clumps or in strings, usually in water
- Egg –> juvenile –> adult
- Some undergo incomplete metamorphosis and remain aquatic for life
Describe the characteristics of the order gymnophiona
- Caecilians
- Elongate, limbless, very small eyes
- Burrowing terrestrial
- Internal fertilization, oviparous
- Eggs –> aquatic or terrestial young –> terrestrial adult
Describe the housing requirments of amphibians.
- Appropriate for species
- Aquarium, terrarium, vivarium
- Variable temp (50-75+)
- Variable humidity
- Day/night - metabolism
- Escape proof
Describe nutritional requirements of amphibians.
- Adults and larval diet may differ
- Most adults = insectivorous, high protein diet needed
- Larval forms = herbicorous
- Both must be habituated to nonliving food items and commercial diets
- Susceptible to metabolic bone disease, gout, lipid keratopathy, and anemia
What are the major diseases of amphibians (9)?
- Water quality problems
- Bacterial dermatosepticemia
- Mycobacteriosis
- Chromomycosis
- Saprolegniasis
- Chytridiomycosis
- Capillariasis
- Lucke’s tumor
- Iridoviruses
Describe water quality problems in amphibians.
- Primary stressor for all aquatic animals
- Ammonia-nitrite-nitrate toxicities
- Temp, DO, pH
- Buildup of organic waste material
- Chlorine, chloramines, heavy metals
- Skin and gill irritation, epithelial hyperplasia, lethargy, reduced growth
- Control via filtration and sanitation
What is red-leg syndrome/disease in amphibians?
Bacterial dematosepticemia
Describe bacterial dermatosepticemia in amphibians.
Include species
- Red leg syndrome or disease
- Frogs, salamanders, aquatic larval stages
- Aeromonas hydrophilia, others
- Opportunisit pathogen of skin
- Secondary to stress, trauma, poor water quality
- Control via sanitation, environmental quality, and optimal nutrition
Describe mycobacteriosis in amphibians.
- Mycobacterium forituitum, marinum. xenopi - non-tubercular species
- Common in water sources and biofils
- Chronic wasting disease, skin ulcerations, decreased fecundity
- Control va enviornmental sanitation
- Euthanasia recommended due to zoonotic potential, therapeutics not recommended.
Describe Saprolegniasis in amphibians.
- Fungal disease (saprolegnia, aphanomyces)
- White cottony growth on skin
- Spread via motile zoospores in water
- Opportunistic pathogens of skin or eggs
- Secondary to stress, truama, and poor water quality
- Control via sanitaiton, environmental quality, and optimal nutriton
Describe chromomycosis in amphibians.
- Fungal disease ( cladosproium, foncacaea)
- Disseminated pigmented granulomas in skin and internal organs
- Soil saprophytes
- Therapeutics unrewarding
- Zoonotic potential
Chytridiomycosis is caused by ________, which is a primary pathogen found in ____. It affects ______. It’s importance in amphibians is __________. This disease is/isnot zoonotice. It often presents as ___________ and up to _____% mortality. Clinical signs are ___________.
Chytridiomycosis is caused by Batrachochytrium dendrobatidis, which is a primary pathogen found in soil and water. It affects all anurans - metamorphs and adults but tadpoles seem to be asymptomatic carriers. It’s importance in amphibians is it is thought to be the cause of worldwide decline of many amphibian species. This disease is not zoonotic. It often presents as sudden death with no obvious external signs and up to 100% mortality. Clinical signs are nonspecific - lethargy, excessive skin shedding, ventral erythema, petechiation, deformities of keratin in the mouth of tadpoles, and cutaneous lesions on toes.
Describe the pathogenesis of chytridiomycosis.
- Flagellated dhytrid zoospore = infective stage
- Lives on keratin within epidermis
- Tadpoles lack keritinized skin, so generally do not show clinical signs
- Adult = hyperkeratosis, epidermal hyperplasia, ulceration, edema, congestion of epidermis
- Death likely due to loss of cutaneous integrity with impairment of osmotic regulation and oxygen exchange
- Secondary bacterial infection common
- Non-hyphal fungal pathogen invades tissues and degrades cellulose, chitin, and keratin.
Chytridiomycosis diagnosis in amphibians
- Skin scrapings or tissue samples (wet mount)
- Biopsies of toes or skin lesions for histology
- Commercially available PCR for chytrid DNA (most sensitive)
Chytridimycosis treatment
- Soak for 5 mins daily for 11 days in itraconazole or miconazole bath
- Thorough disinfection (1:9 bleach and water) of tankes with multiple rinses to get rid of toxic residues
- Tx recommended only for valuble specimens
Describe capillariasis in amphibians.
- Chronic, cutaneous infection of frogs, esp xenopus
- Migration of nematoide with secondary infections (myco)
- Irritation, increased mucus, skin sloughing
- Tx = ivermectin
Describe Lucke’s tumor in amphibians.
- Ranid herpesvirus 1 - Northern Leopard frog
- Causes renal adenocarcinoma
- Seasonal change with tumor being more prevalant in the sprig when frog emerges from hibernation
- Rare in summer months
- Virus shed in urine
- Frog eggs and young highly susceptible
Describe iridoviruses in amphibians.
- Emerging disease of amphibians
- Cause of mass mortalities in both wild and captive amphibian populations
- CS = lethargy, anorexia, abnormal posture, abnormal swimming behavir
- Erythema and hemorrhage of mouth and legs, skin lesions, body swelling, death
What are the important zoonotic diseases of amphibians (3)?
- Aeromonas spp
- Mycobacterium spp
- Chromomycotic spp
List the pocket pet species in order for shortest to longest lifespan.
Gerbils, hamsters, ferrets, mice, rabbits, guinea pigs, rats
- Mouse (1.5-3 years)
- Hamsters (2-3 years)
- Rats (2-3 years)
- Gerbils (3-4 years)
- Guinea pigs (5-7 years)
- Ferrets (5-8 years)
- Rabbits (6-15 years)
What species are included in the suborder myomorpha of the order rodentia?
Rattus rattus (rat), mus musculus (mouse), Mesocricetus auratus (hamster), meriones unguiculatus (gerbils)
Describe the major characteristics of mice and rats (myomorpha).
- Short hair, long naked tails
- Rounded erect ears
- Protruding eyes
- Pointed snow, long vibrissae
- 5 toes
- Variety of coat colors
- Mostly nocturnal animals
- Harderian gland
What is the Harderina gland?
- Gland located in orbit around both eyes
- Produces prophyrin = iron containing reddish pigment
- Stress causes hypersecretion (red tears)