Lab 9 - Invertebrates (2) Flashcards
two other lineages in Bilateria
Ecdysozoa
Deuterostomia
the commonality of ALL members in clade Ecdysozoa
all display ecdysis (moulting of outermost layer)
phyla in clade Ecdysozoa
Phylum Nematoda
Phylum Athropoda
3 lineages in Phylum Arthropoda
Myriapods
Pancrustaceans
Chelicerates
3 distinguishing features of Deuterostomes
- radial, indeterminate cleavage
- coelom forms from buds of the mesoderm
- blastophore forms anus
two phyla in Deutersotomia
- Phylum Chordata
- Phylum Echinodermata
Phyla Echinodermata includes
- sea stars
- urchins
- sand dollars
- sea cucumbers
phyla Chordata includes
- Cephalochordate - lancelets
Urochordata - Tunicates
Vertebrata - Vertebrates
4 characteristics of Phyla Chordata
- notochord
- post-anal tail
- dorsal hollow nerve cord
- pharyngeal gill slits
Ecdysozoan development
protostome invertebrates
Phylum Nematoda are
round worms
Nematode belong to which major lineage
Ecydosozoa
way of life for Nematodes
either free-living or parasitic
type of coelom in Nematodes
pseudocelomate
are Nematodes segmented or unsegmented
unsegmented
what covers a Nematode
cuticle
example of a parasitic Nematode
Ascaris
where does the Nematode Ascaris live
in the intestines of the host
male vs female Ascaris Nematodes
male is smaller than the female and has hooked posterior end
least to most inclusive
Ascaris: Nematodes: Ecdysozoa: Bilateria: Eumetazoa: Metazoa
type of symmetry in Phylum Arthropoda
bilateral
are members in Phyla Arthropoda segmented or unsegmented
segmented
type of coelom in Arthropoda
eucoelomate
type of development in Arthropoda
protostome
what major lineage do Arthropoda belong to
Ecdysozoan
what do members of Arthropoda have
chitinous exoskeleton
type of circulatory system in Arthropoda
open
describe the digestive tract of Arthropoda
complete digestive tract (with anus)
do Arthropoda have a brain
YES
three regions of the Arthropoda body
- head
- thorax
- abdomen
most diverse and numerous of all animal phyla
Arthropoda
three major lineages in Arthropoda
- Chelicerates
- Pancrustaceans
- Myriapods
leas to most inclusive
Arthropoda: Ecdysozoa: Bilateria: Eumetazoa: Metazoa
least to most inclusive (spiders)
Chelicerates: Arthropoda: Ecydsozoa: Bilateria: Eumetazoa: Metazoa
parts of the Chelicerates body/appendages
- four pairs of legs
- two pairs of head appendages
what are the two different head appendages in Chelicerates
- chelicerae
- pedipalps
function of Chelicerae in Chelicerates
pincerlike head appendages used for feeding
function of pedipalps in Chelicerates
mainly sensory but can be used for feeding, locomotion or reproduction
members of Chelicerates
- spiders
- tick
- mites
- scorpions
characteristics of spiders in Chelicerates
cephalothorax and legless abdomen
characters of mites AND ticks in Chelicerates
abdomen fused to leg-bearing region
characters of scorpions in Chelicerates
elongated abdomen bearing poisonous sting
describe the crustacean group based on recent molecular evidence
paraphyletic
why was the crustacean group seen as paraphyletic
some crustaceans were more closely related to insects than other crustaceans
when do crustaceans form a monophyletic group
when together with insects
what is the NEW group that comprises BOTH insects and crustaceans
pancrustaceans
what defines crustaceans from other arthropods
they have
1. mandibles (mouthparts used to crush and grind food)
2. two pairs of antennae
3. thoracic and abdominal appendages
where do crustaceans live
marine and freshwater
least to most inclusive
Crustaceans: Pancrustaceans: Phyla Arthropoda: Ecdysozoan: Bilateria: Eumetazoa: Metazoa
four orders found in the Crustaceans of pancrustaceans
- order Isopoda (pill bugs)
- order Decapoda (crayfish)
- Class Maxillopoda (barnacles)
- Class Branchiopoda (water fleas)
what order is this in Crustaceans of pancrustaceans
terrestrial crustaceans
Isopoda (pill bugs)
what order is this in Crustaceans of pancrustaceans
have seven pairs of legs all of similar shape and size
Isopoda (pill bugs_
what order is this in Crustaceans of pancrustaceans
have well-developed carapace that covers the dorsal side of the cephalothorax
Decapoda (Crayfish)
what order is this in Crustaceans of pancrustaceans
marine suspension feeders
Maxillopoda (branacles)
what order is this in Crustaceans of pancrustaceans
their feet are modified as feeding structures
Maxillopoda (barnacles)
what order is this in Crustaceans of pancrustaceans
small group of planktonic organisms
Branchiopoda (water fleas)
what order is this in Crustaceans of pancrustaceans
indicators of aqueous toxins
Branhicopoda (water fleas)
what order is this in Crustaceans of pancrustaceans
organisms poss gills on their appendages
Branchiopoda (water fleas)
Least to most inclusive
Isopoda: Crustacean: Pancrustaceans: Ecdysozoans: Bilateria: Eumetazoa: Metazoa
least to most inclusive
Decapoda: Crustacean: Pancrustaceans: Ecdysozoans: Bilateria: Eumetazoa: Metazoa