Annelida Flashcards
the two clades in Annelida
- Errantia
- Sedentaria
Annelida means
little rings
describe the body of annelida
segmented worms
where do Annelia live
marine
aquatic
terrestrial
least to most inclusive
Phylum Annelida: Lophotrochozoan: Bilaterian: Eumetazoan: Metazoan
traits of Annelida
- ALL have segmented bodies
- complete gut with mouth and anus
- sophisticated nervous, circulatory, reproductive and excretory systems
describe the development of Annelida (4)
- bilaterian (bilateral symmetry)
- triploblastic
- coelomates
- Protostome
sexual reproduction in annelids can be via
hermaphroditism OR dioecy
clade Errantia are ______ (mobile or sessile)
mobile
clade Errantia habitat
marine
what is one trait that many species in clade Errantia share
pair of paddle-like or ridge-like structures called parapodia
what do each parapodium have in clade Errantia
numerous chaetae bristles made from chitin
are parapodia unique ONLY to clade Errantia
NO
function of parapodia
- locomotion
- respiration
- predator behavior
do clade Errantia have well-developed jaws
YES
do clade Errantia show cephalization
YES
example of a species in clade Errantia
polychaete
least to most inclusive
Polychaete: clade Errantia: phylum Annelida: Lophotrochozoan: Bilateria: Eumedazoa: Medazoan
Clade Sedentarians are ______(mobile/sessile)
TEND to be less mobile
Clade Sedentarians habitats
- some burrow into the substrate
- some live in protective tubes
what do tube-dwelling Sedentarians have
elaborate gills or tentacles used for filter feeding
what sepcies are included in Clade Sedentarians
- tubeworms
- leeches
- earthworms
least to most inclusive
Christmas Tree Worm: Clade Sedentarians: Annelida: Lophotrochozoan: Bilaterian: Eumetazoan: Metazoan
Clade Sedentarians habitats
- marine
- terrestrial
- aquatic
- ice
earthworm movement VS Nematode movement
earthworms have BOTH longitudinal and circular muscles while Nematodes have ONLY longitudinal
earthworm circulatory system
closed
do earthworms have a brain
NO- they aren’t predators so they don’t need a prominent mass of sensory organs
how many chaetae per segment in earthworms
8
what structure is associated with excretion in earthworms
Metanephridium
Metanephridium function
- removes fluid waste through pores
- solid waste it removed by the anus
what does the coelom act as in earthworms
a hydrostatic skeleton
what do chaetae provide in earthworms
traction
how do earthworms gain their nutrients
eat through soil, extracting nutrients as the soil moves through their alimentary canal
reproduction in earthworms
they are hermaphrodites BUT cross-fertilize (swap sperm)
can earthworms reproduce asexually
some can by fragmentation
leeches belong to
Clade Sedentarians
leech habitats
- most are freshwater
- some are marine or terrestrial
most leeches are
parasitic
specialized trait for parasitic leeches
secrete a chemical called hirudin to prevent blood from coagulating
adaptions of the leech for their parasitic way of life
- flattened body
- reduced coelom
- chaetae are absent
- suckers at BOTH anterior and posterior ends
least to most inclusive
leeches: Clade Sedentarians: Annelida: Lophotrochozoan: Bilaterian: Eumetazoan: Metazoan
