Information
AI Chat

Ch13 Arthropoda diversity- Trilobites;Chelicera;Myriapoda

Zoology 212 Lecture notes on Trilobites, chelicera and myriapods

Course

Zoology (BIOL 212)

28 Documents

Students shared 28 documents in this course

University

Saginaw Valley State University

Academic year: 2022/2023

Uploaded by:

Anonymous Student

This document has been uploaded by a student, just like you, who decided to remain anonymous.

Saginaw Valley State University

Comments

Please sign in or register to post comments.

Preview text

1 There are many extinct arthropod groups, including trilobites [Trilobita † ] that disappeared ~250 mya. 3 tagmata & biramous appendages hypostome Compound eye 1 2 Trilobites were ecologically and morphologically diverse serving as important index fossils. Longitudinal furrows in yellow 3 lobes in transverse section furrows 2

allttatic

ventuall -Omatium dorsal/ ventral found in Ml flattened -Indicate Mi once under was water

Phylum Subphyla

5 Horseshoe crabs [Merostomata] are marine with book gills for respiration. They are scavengers and predators. book gills between plates Gnathobase to hold and push food toward mouth Pinterest M. Manas, Wikimedia Commons en.wikipedia 1 2 telson chelicerae crabofhorseshoe.weebly 5 6 Surviving since the Triassic, we’ve nearly driven it to extinction through exploitation: bait, model organism for vision, pharmaceutical use of blood. 1 gallon = $60, horseshoe-crabs/horseshoe-crab-pictures/ Mass spawning Migrating red knots eating eggs. perspectives.dnrec.delaware Blue due to copper; hemolymph is > million sensitive than ours. Test sterility of injected blood and medical equipment. 6 aquatic

fer X ~

pistosoma S. ~ compound large - eve gas exchange exoskeleton

Prostoma

####### bio

7 The earliest arachnids were marine but almost all extant species are terrestrial and feed exclusively on fluids. Bangordailynews Pedipalp function varies. 4 pr. walking legs. ednieuw.home.xs4all Chelicerae are fangs! 7 8 Spiders have 4 pairs of ocelli and multiple sensory setae. 8

scorpines

Spiclers

Fickites

has venom

opisthosoma

rostoma

8 total terrestrical organism

=

amellae -> -

11 Many ticks are vectors of diseases including Lyme disease, encephalitis, and Rocky Mountain spotted fever. Bull's-eye rash of Lyme disease. webmd Borrelia bacteria, the causative agent of Lyme disease. Deer tick, Ixodes scapularis 11 12 Scorpions are terrestrial, carnivorous, and the largest of all arachnids. thescyphozoan.ucmerced Bark scorpion. 2008. photo by Musides. Wikimedia pedipalps chelicerae Live birth and parental care T. Zimmerman UV fluorescence Pectines: mechano- & chemosensory 2-part opisthosoma telson = stinger 12 vecters

spiral-

COmblit = telsor

I

Opisthosoma

13 B1. Myriapoda [“many footed”] are uniramous mandibulates with 1 pr. antennae and an unwaxed cuticle. thescyphozoan.ucmerced Class Chilopoda Carnivorous Poison claw (forcipule: modified leg) 1 pr jointed legs / segment 1 pr spiracles / segment Lack compound eyes Malpighian tubules [excretory organ] Class Diplopoda Herbivorous Repugnatorial glands 2 pr jointed legs / abd. segment 2 pr spiracles / segment Lack compound eyes Malpighian tubules bbc.co 13 subphula ↓ Centiped milliped

AthrododSur

i ~ defensive mechanism ~ via contact looks like claw vom hemocoei nod in treachael system

Was this document helpful?