Template:Annotated image/Arthropod head problem

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Four types of arthropods and their 10 body segments. All four start with acrons that have compound eyes. Trilobites and chelicerates have 7, and crustaceans and tracheates 5 head segments, as follows: antenna segments, 1 in Tri and tracheates and 2 in crustaceans; then segments lost during development, 1 in chelicerates and 1 in tracheates; then a chelicera and a pedipalp segment in chelicerates; then 1 mandible and 2 maxilla segments in crustaceans and tracheates; then leg segments, 5 in trilobites and 4 in chelicerates. After head segments, trilobites have 2 unlabeled segments, chelicerates have 1 chilarium and 1 unlabeled segment, and crustaceans and tracheates have 4 leg segments. Nephridia occur in trilobites' and chelicerates' leg segments, in chelicerates' chelicera and pedipalp segments, in crustaceans' 2nd antenna and 2nd maxilla segments, and in tracheates' maxilla segments; the first and last segments in chelicerates that have nephridia lose them during development.
A
L
L
L
L
L
L
x
C
P
L
L
L
L
Ci
A
A
Mnd
Mx
Mx
L
L
L
L
A
x
Mnd
Mx
Mx
L
L
L
L
    = acron
    = segments included in head
    = body segments
x = lost during development
    = compound eye
    = nephridia
O = nephridia lost during development
L = Leg
Mnd = Mandible
Mx = Maxilla
Four types of arthropods and their 10 body segments. All four start with acrons that have compound eyes. Trilobites and chelicerates have 7, and crustaceans and tracheates 5 head segments, as follows: antenna segments, 1 in Tri and tracheates and 2 in crustaceans; then segments lost during development, 1 in chelicerates and 1 in tracheates; then a chelicera and a pedipalp segment in chelicerates; then 1 mandible and 2 maxilla segments in crustaceans and tracheates; then leg segments, 5 in trilobites and 4 in chelicerates. After head segments, trilobites have 2 unlabeled segments, chelicerates have 1 chilarium and 1 unlabeled segment, and crustaceans and tracheates have 4 leg segments. Nephridia occur in trilobites' and chelicerates' leg segments, in chelicerates' chelicera and pedipalp segments, in crustaceans' 2nd antenna and 2nd maxilla segments, and in tracheates' maxilla segments; the first and last segments in chelicerates that have nephridia lose them during development.
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Illustrates the Arthropod head problem

Usage

float
values right, left or none
default right

Refs

  1. Ruppert, E.E., Fox, R.S., and Barnes, R.D. (2004). Invertebrate Zoology (7 ed.). Brooks / Cole. p. 520. ISBN 0030259827.CS1 maint: multiple names: authors list (link)