AMMOCOETES LARVA

Written by Wednesday, 28 June 2017 17:35
Ammocoetes Larvae: Matamorphosis   In the life history of Petromyzon a larval form is seen. It is called Ammocoetes larva.   Ammocoetes larva is transparent and 1 cm., in length.…

BRANCHIAL BASKET OF PETROMYZON

Written by Wednesday, 28 June 2017 17:24
Branchial Basket   In Petromyzon the visceral skeleton contains branchial basket. It lies external to the gill pouches. It shows 9 irregular vertical bars and 4 longitudinal bars on either…
Myxine (Hagfish) Petromyzon (Lamprey) 1. Hag fishes are scavengers. They penetrate into the dead fishes bodies and eat the tissues. 1. They are semi parasitic. But the Larvae(Ammocoetes) leads an…

CLASSIFICATION OF CYCLOSTOMATA

Written by Wednesday, 28 June 2017 15:49
The class Cyclostomata is divided into two orders:1) Petromyzonia and 2) Myxinoidea   Order 1: Pefromyzonia   Lampreys are included in this order. The buccal funnel is suctorial and shows…

GENERAL CHARACTERS OF CYCLOSTOMES

Written by Wednesday, 28 June 2017 15:28
Cyclostomes’ are jawless vertebrates. They are primitive vertebrates. The cyclostomes are marine or fresh-water vertebrates.   It includes the lampreys and hag fishes.   The body is long, eel like.…

CLASSIFICATION OF VERTEBRATA

Written by Wednesday, 28 June 2017 14:51
SUB-PHYLUM VERTEBRATA is further divided into two super-classes.   AGNATHA, AND GNATHOSTOMATA.   SUPER-CLASS 1. AGNATHA: (A = Without; Gnathos = Jaw).   Earlier vertebrates are included in it They…

CHARACTERS OF VERTEBRATES

Written by Wednesday, 28 June 2017 14:27
Vertebrates show the following characters, besides the chordate characters.   1. PRESENCE OF ENDO AND EXO-SKELETON: Vertebrates include internal skeleton which is a notochord or vertebral column. Vertebrates contain exoskeleton,…
LARVAE OF PORIFERA   1. Parenchymula (Stereo- gastrula) - Leucosolenia 2. Rhagon - Higher sponges 3. Amphiblastula - Sycon   LARVAE OF COELENTERATA   1. Planula - Obelia, Sea Anemone…

MOST PRIMITIVE ANIMALS

Written by Tuesday, 27 June 2017 01:16
Most primitive primate Lemur     Most primitive mollusc Chaetoderma     Most primitive Arthropod Peripatus     Most primitive Annelida Polygordius     Most primitive fish Climatius    …
Previously we discussed about various exocrine glands in and foramen in animals. This topic covers about various principle ducts and canals present in animal body and their location and their…
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