CH-33 An Introduction to Invertebrates Pt 2 Flashcards

2713030960	What are Annelids bodies composed of?	Annelids are coelomates with bodies composed of a series of fused rings	0
2713040465	What were the 3 clades Annelids was traditionally divided into?	The Phylum Annelida was traditionally divided into three clades Polychaeta (polychaetes) Oligochaeta (oligochaetes) Hirundinea (leeches)	1
2713045969	What are the two major clades annelids can be divided into?	Recent molecular analyses indicate that the annelids can be divided into two major clades Errantia Sedetaria	2
2713088750	Clade Errantians	Most members of clade Errantia are mobile, marine organisms	3
2713104549	What is Parapodia?	Many errantians have a pair of paddle-like or ridge-like structures called parapodia ("beside feet") on each body segment	4
2713135642	What are pappodium's bristles made of?	Each parapodium has nuemerous chaetae, bristles made of chitin	5
2713146402	Sedentarians	Sedentarians tend to be less mobile than errantians Some species burroww inot the substrate, while others live in protective tubes This clade also contains the leeches and the earthworms	6
2713147981	How do tube-dwelling Sedentarians feed?	Tube-dwelling sedentarians often have elaborate gills or tentacles used for filter feeding	7
2713153028	Habitat of Leeches	Most species of leeches live in fresh water; some are marine or terrestial	8
2713157398	Predators of leeches includes	Leeches include predators of invertebrates, and parasites that suck blood	9
2713161130	What chemical does leeches secrete?	Leeches secrete a chemical called hirudin to prevent blood from coagulating	10
2713165136	How do earthworms eat?	Earthworms eat through soil, extracting nutrients as the soil moves through the alimentary canal	11
2713175009	How do earthworms reproduce	Earthworms are hermaphrodites but cross-fertilize Some reproduce asexually by fragmentation	12
2717231058	Fig 33.25		13
2713188094	Ecdysozoans	they are the most species-rich animal group	14
2713188372	What is cuticle	Ecdysozoans are covered by a tough coat called a cuticle	15
2713190628	What is ecdysis	cuticle is shed or molted through a process called ecdysis	16
2713287569	What are the two largest phyla of Ecdysozoans?	Phyla Nematodes and Phyla Arthropods	17
2713302156	Nematodes	Nematodes, or roundworms	18
2713290359	Where are Nematodes found?	They are found in most aquatic habitats, in the soil, in moist tissues of plants, and in body fluids and tissues of animals	19
2713319864	What is the model organism in research?	Caenorhabditis elegans is a model organism in research	20
2713321115	How can human acquire Trichinella spiralis?	Trichinella spiralis can be aquired by humans from undercooked pork	21
2713522590	_____ out of every three known species of animals are arthropods	two	22
2713523333	What does arthropod body plan consists of?	The arthropod body plan consists of a segmented body, hard exoskeleton, and jointed appendages	23
2713527496	General Characteristics of Arthropods	the appendages of some living arthropods are modified for functions such as walking, feeding, sensory reception, reproduction, and defense these modified appendages are jointed and come in pairs	24
2717232865	Fig 33.30		25
2713530861	Arthropods body is completely covered by what?	the body of an arthropod is completely covered by the cuticle, an exoskeleton made of layers of protein and the polysaccharide chitin	26
2713532702	How do arthropods grow?	By molting its exoskeleton	27
2713533490	Arthropods unique eyes and antennae	arthropods have eyes, olfactory receptors, and antennae that function in touch and smell	28
2713539069	What kind of circulatory system does arthropods have?	an open circulatory system in which hemolymph is circulated into the spaces surrounding the tissues and organs	29
2713544185	What are the three major lineages that diverged early in the phylum's evolution	Chelicerates (sea spiders, horseshoe crabs, scorpions, ticks, mites, and spiders) Myriapods (centipedes and millipedes) Pancrustaceans (lobsters and other crustaceans, as wellas insects and their relatives)	30
2713586333	What are Chelicerates are named for?	Chelicerates, clade Chelicerata, are named for clawlike feeding appendages called chelicerae	31
2713586917	What are the two parts of Chelicerates?	They have an anterior cephalothorax and a posterior abdomen	32
2713588699	What were the earliest chelicerates?	The earliest chelicerates were eurypterids (water scorpions)	33
2713591625	Chelicerates	Most marine chelicerates (including eurypterids) are extinct, but some species survive today, including horseshoe crabs	34
2713598180	What does modern Chelicerates called?	Most modern chelicerates are arachnids, which include spiders, scorpions, ticks, and mites	35