CLASSIFICATION OF SIREN : MUD EEL
PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present )
Group :- CRANIATA ( Definite head. Cranium with brain present )
Sub-phylum :- VERTEBRATA ( vertebral column present)
Division :- GNATHOSTOMATA ( Jaws and paired appendages present )
Super class :- TETRAPODA ( Paired limbs, lungs, bony skeleton and cornified skin)
Class :- AMPHIBIA ( Scaleless glandular skin , have 3 chambered heart , cold blooded, 2 occipital condyles, can live in water and land both )
Sub-order :- SIRENIDEA ( Permanent larval form) .
Genus :- Siren
It is found in USA.
HABIT AND HABITAT
They is found in the burrows, muddy ditches and ponds. They are carnivorous and prey upon invertebrates and aquatic vertebrates with a possible preference for molluscs, although they have been observed to eat vegetation. They are nocturnal and spend the day in dense vegetation.
GENERAL CHARACTERSTICS OF SIREN : MUD EEL
- It is commonly called as mud eel.
- Body is slender, elongated. 75 cm in length, covered with small papillae and divided into head, trunk and tail.
- Head is conical with small eyes and nostrils. Eyes are without eyelids.
- Forelimbs are small containing 4 digits while hind limbs are absent.
- Tail is provided with small caudal fin.
- Jaws with horny covering.
- There are 3 pairs of external gills which are persistent. Gill-slits one pair.
- They can vocalize, producing clicks or yelps sounding similar to the call of the American green tree frog.
- They lack hindlimbs as well as a pelvic girdle, and have external gills all throughout their lives along with small lungs.
- They lack eyelids, and have an unfused pectoral girdle.
- Their spermatozoa possess a pair of flagella.
- Cloacal glands are absent. Fertilization is probably external.
- live at least 25 years or longer in captivity.
They are permanent larval form with only a few adult features. Larvae do not undergo complete metamorphosis.
Since this urodele has slender body, gills, only forelimbs and above features, hence it is Siren or mud eel.
- Book of Practical Zoology VERTEBRATE by S.S.LAL – Rastogi Publications.
- SOURCES OF IMAGES – https://www.google.com/url?sa=i&url=https%3A%2F%2Fherpsofnc.org%2Fgreater-siren%2F&psig=AOvVaw0fpz44qIf6voXPQyomlO7U&ust=1602676518204000&so urce=i mages&cd=vfe &ved=2ahUK Ewifrd 21wb HsAhWZD7cA HUJ9ABcQr4kDegU IARDiAQ
- https://www.google. com/url? sa=i&url=https%3A %2F%2Fwww.wikiw and.com%2Fen%2F Lesser_siren&psig=AOvVaw0fpz44qIf6v oXPQyomlO7U&ust =160267651820400 0&source=images&c d=vfe&ved=2ahUKE wifrd21wbHsAhWZ D7cAHUJ9ABcQr4kDegUIARDSAQ
- https: // www.google.com/url ? sa=i&url=https%3A %2F% 2Fanimaldiversity.or g%2Fsite%2Faccoun ts%2Finformation% 2FSiren_intermedia. html&psig=AOvVaw 0fpz44qIf6voXPQyo mlO7U&ust=160267 651820 4000&source =imag es&cd=vfe&ve d=2ah UKEwifrd21w bHsAhWZD7cAHUJ 9ABcQr4kDegUIAR DJAQ