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Arthro. Systematics

Entomology

QuestionAnswer
Phylum Arthropoda: -Arthropods -Make up an extremely large phylum, over a million known species -Range in size from micro- to macroscopic -Found in marine, freshwater, land, air -One of the most diverse animal groups
Phylum Arthropoda cont: -Segmented body -Exoskeleton present -Requires periodic molting for growth -Open circulatory system -Complex respiratory systems -Characteristic nervous system -Different excretory systems
-Many means of mechanical, chemical senses -Mainly dioecous, reproduce sexually Subdivided into subphyla: -Tribolites (extinct) -Chelicerates -Myriapods -Crustaceans -Hexapods
Distinguishing characteristics of phylum Arthropoda: -Bilateral symmetry -Possess an exoskeleton -Possess segmented body Have jointed appendages
Subphylum Trilobitomorpha: Trilobitomorpha: -Most primitive of arthropods -Appeared roughly 570 mya -Three body regions -Each segment contained jointed, unspecialized appendages
Class Trilobita: Trilobita: -Contained approximately 5,000 genera -Ranged in size from 1 mm to 72 cm -Morphology of fossil record complicated -Digestive tract present -Other systems implied, not confirmed -Antennae, eyes -Overall development
Distinguishing characteristics of class Trilobita: -Dorsal exoskeleton divided longitudinally -Presence of cephalon -Presence of articulated thorax -Presence of pygidium
Subphylum Chelicerata: Chelicerata: -Subgroup of arthropods Based upon the characteristics: -Prosoma, opisthosoma -Chelicerae present
Class Arachnida Arachnida: -Includes spiders, scorpions, ticks, mites -Adult arachnids generally possess 8 legs -Lack antennae and wings -Most possess book lungs -Primary waste product is guanine -Mostly carnivorous -Most reproduction sexual, mostly oviparous
Class Merostomata: Merostomata: -Class of aquatic chelicerates -Exclusively marine -Includes sea scorpions and horseshoe crabs -Only 4 species of horseshoe crabs remain -Modern horseshoe crabs known as living fossils
Created by: Zayla
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