Lecture 14- Myriapods & Echinoderms Flashcards
(24 cards)
What type of symmetry do Arthopods have
Bilateral symmetry
Name 4 characteristics of Arthopods
- protostomes
- Coelomate
- Segmentation
- Jointed limbs
Name 5 characterises of Myriapods
- Triploblastic
- Coelomate
- Bilaterally symmetrical
- Decomposers/detritivores
- Terrestrial
Name 5 body characteristics for Myriapods
- Head- pair of antennaes
- simple eyes
- Jointed appendages- many legs
- Segmented body
What are the 3 appendages modified as mouthparts
- Mandibles
- Labrum
- Maxillae
Name 6 characteristics for the internal anatomy of Myriapods
- Tracheal system, paired with spiracles
- Tubular heart
- Open circulatory system
- Malphigan tubules
- Poor developed brain
- Double ventral nerve cord
Name 4 characteristics of their reproduction
- Dioecious
- Internal fertilisation
- Lays eggs
- Direct development
What’s an anamorphosis mean
Adding new segments as they moult
What are the three types of anamorphosis
Euanamorphosis: Add new segments after moulting
Teloanamorphosis: No new segments after maturity
Hemianamorphosis: No new segments and moult after maturity
What are the 4 groups of Myriapods
- Chilopoda (centipedes)
- Symphyla
- Pauropoda
- Diplopoda (millipedes)
Characteristics of Chilopoda
- Fast, active predators
- Nocturnal
- 1 pair of legs per segment
- fangs and venom
5 Characteristics of Dilopoda
- Slow-moving
- Detritivores/herbivores
- 2 pairs of legs per segment
- euanamorphosis
- bezoquinones and cyanide gas
8 Characteristics of Pauropoda
- small
- soil- dwelling
-herbivores/fungivores - 1 pair of legs per segment (dorsal tergites)
- lacks eyes
- nocturnal
- pseudoucli
- spermatophores
8 Characteristics of Symphyla
- small
- soil-swelling
- pale coloured
- detritivores
- lacks eyes- long antennae
- overlapping dorsal plates
- pair of cerci= spinnerets
- spermatophores
3 Characteristics of Echinoderms
- Radially symmetrical
- Triploblastic
- dueterostome coelomates
Importance of Echinoderms (4)
- bioperturbators
- fisheries
- ecological phase shifts
- habitat determiners
5 physical characteristics of Echinoderms
- Endoskeelton (ossicles)
- water vascular system (tube feet)
- dermal branchiae
- madreporte
- pedicellaria
4 parts of the Echinoderms respiration system
- Gills
- Papula
- Tube feet
- paxillae
5 Classes of Echinoderms
- Crinoidea (Feather stars/ sea lillies)
- Asteroidea (sea stars)
- Ophiuroidia (brittle stars)
- Holothuroidea (sea cucumbers)
- Echinoidea (sea urchins, sand dollars)
Characteristics of Crinodea (7)
- leathery skin
- calcareous ossicles
- no pedicellaria, spines or madreporite
- filter feeders
- complete digestive system
- diffusion in tube feet
- cirri
Characteristics of Asteroidea
- ossicles
- pedicellaria
- > 5 arms
- spines
- regeneration
- ambulacral grooves
- 2 stomachs (cardiac, pyloric)
Characteristics of Ophiuroidia (7)
- ossicles
- no pedicellarial
- central disc
- 5 slender arms
- closed ambulacral grooves
- bursa
- no anus or skin gills
Characteristics of Holothuroidea (7)
- elongated oral/oboral axis
- lacks arms
- internal madreporite
- stone canal
- small ossicles
- suspension and deposit feeders
- oral tentacles
Characteristics of Echinodea (8)
- test (globular or flattened)
- no arms
- pedicellaria
- Venom
- respiratory podia
- spines attached to test
- aristotles lantern
