arthropods Flashcards
what are some characteristics of the body plan of the onchyphora
it is segmented with paired appendages, has a complete gut, has a thick, chitinous and permeable cuticle, has a paired ventral nerve cord and has a reduced coelum
what type of circulation does the onchyphora have
open circulation with a large haemocoel to bathe all the organs in blood
what are some characteristics of the oncyphora internal anatomy
has paired ovaries and a uterus, the spermatophore is attached to the female body, and it has a ladder like nervous system
how many segmented pairs of legs does the tardigrada have
4 pairs of legs (lobopods) with claws
what type of ocelli does tardigrada have and what does this mean
has simple ocelli, meaning it has rudimentary vision
what is some of the characteristics of the internal anatomy of a tardigrada
no heart, nephridia or gas exchange system, has malphigian glands, has a hydrostatic skeleton, has a stylet for feeding, and its CNS is ladder like
what are some basic characteristics for the arthropoda
tripoblastic and bilaterally symmetrical, body segmented into a head and a trunk, every segment has a pair of legs, compound eyes, open circulatory system, and has a complete gut
what are some characteristics of the generalised arthropod
dorsal heart with open circulatory system, paired ventral nerve cord, and muscle attachments to the rigid exoskeleton
what is the arthropod cuticle made up of
chitin
what are the 2 types of cuticle and what do they do in arthropods
epicuticle, is a thin waterproof layer. and procuticle made up of the exo and endocuticle that is thick and strong for support
what are the chitinous projections from the cuticle called in arthropods
seta
what are arthropods limbs made up of
protopod (coxa and basis), exopod (lateral), and endopod (medial, ischum, merus, carpus, propodus, and dactyl)
what is the arthropod gut made out of
foregut, midgut and hindgut
what structures can an arthropod gas exchange system be made up of
gills (for aquatic species), book lungs (for dry environments), and tracheae (air filled tubes in insects)
how do arthropods excrete waste
by diffusing nitrogenous waste across gills or body into environment.
what are some characteristics of the cheliceriforms
have 2 tagmata (prosoma and opisthoma), have prosomal appendages, use both book gills and book lungs or tracheae, and excretion is one through the Malpighian tubules
what are some common features of arachnids
mostly terrestrial meaning has a waxy cuticle, has 2 tagmata (cephalothorax anterior and abdomen posterior), digestion begins in the preoral cavity, has sense organs called sensory setae, eyes and slit sense organs, and is dioeceous.
what are some external features of scorpions
specialised opisthosoma, and has pectines that sense vibrations
what is some of the external anatomy of a spider
the pedipalps that help in feeding and reproduction and spinnerets
wat does the principle eye do in spiders
is most visually acute and has a wide depth of colour field (if present)
what does the secondary eye do
contains a tapetum to double sensitivity to light
