Vertebrate Zoology Agnatha Anugerah lestari(1114040190) Rizky wildayani(1114040201) Suharyanti Amir ( 1114040 Hagfish & Lamprey
Key Featureso Jaws are absent.o Paired fins are generally absent.o Early species had heavy bony scales and plates in their skin
Key features con’t In most cases the skeleton is cartilaginous. The embryonic notochord persists in the adult. Seven or more paired gill pouches are present. Hagfish sheds slime layer The mouth is in ventro-anterior and plays role as a sucker
Key features con’t A light-sensitive pineal eye is present. The digestive system lacks a stomach. External fertilization; both ovaries and testes present in individual but gonads of only one sex functional in hagfishes, no larval stage; separate sexes and a long larval stage in lampreys.
Systema DigestoriaConsist of ventral mouth containedwithin buccalis closed or openchannel by moving the shape of“platuk “tongue.
Skeleton systemNotochord are partial body axis, inthe form of cylindrical rods of gelatinmaterial encased by connectivetissue. Part skeleton other formcartilage.
Excretory systemTwo kidney (mesonephros) locatednext to the dorsal body cavity: anelongated ureter vessels of eachmesonephros until urogentalis , whichthen emptied its contents throughurogenital papilae.
Respiration systemAmong the respiratory tract and thebody wall are 7 pairs of gills inkentung gill-sac which is located nextto the contiguous. Each sheetcontains gill capillaries
Circulation systemThe shaped is like trophies at the endof the posterior pocket located insidethe cavity related pericardial cavitycoelom.
Digestoria systemConsist of ventral mouth containedwithin buccalis closed or open channelby moving the shape platuk tongue.
SensorisNasal cavity open toward the saccusolfactorious gets olfactorious nervesfrom both lobes of the brain. Therepinealis the lensed eyes bright andpigmented retine. Necrotic foci in thepharynx and flavorings are containedin the next line laterals contiguousbody contains the sense of touch.
Reproduction systemPhase starters could not distinguishbetween males and females, the nextphase will grow into males andfemales.
Hagfish Classification• Kingdom Animalia• Phylum Chordata• Class Pteraspidomorphi• Order Myxiniformes• Family Myxinidae• Genus Myxine• Species Myxine glutinosa
Hagfish Hagfish can be found in chilly waters They tend to live on and in muddy sea floors in very dense groups (up to 15,000 in an area). Because females tend to produce large eggs in small numbers, their population sizes suggest a low death rate.
Hagfish• Diet is made up of marine worms and other invertebrates• They have a ring of short sensitive tentacles around their mouths.• Large slime glands line their sides along the length of their bodies.• Can sneeze to clear slime from nostrils
No jaws. Instead they have two pairs ofrasps on top of a tongue. They pull meatinto their mouths with the tongue, thentear it off the prey with the rasps.
Hagfish have a very low metabolism. Oncethey eat, they may not have to again for up toseven months.Although hagfish have a partial skull, theyhave no back bone, so are not truevertebrates. What skeleton they do have ismade of cartilage.
IC RI ST AC TE ARCH The body shape is round-long shape or cylinder, the tail is flat The mouth is in ventro-anterior and plays role as a sucker Bones of head and archus viceralis are made by hondrocyte bone The blood contains round leucocyte and erythrocyt which have nucleus In the right and left area of pharynx, there are 6-14 pairs of gill which put in a sack The brain has growth well with 8-10 pairs of cranialis nervous Term of body depens on environment ( poikilothermis) The fertilization happens outside, egg will attaches to be larva ( Pe tro m y z o n m a rinus ), or egg will grow to be