Term
| Are annelids protostomes or deuterostomes? |
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Definition
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Term
| Name some defining features of the phylum Annelida |
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Definition
| Bilateral, triploblastic, protostomes, serially segmented, setae/parapodia, cerebral ganglia, longitudinal and circular muscle, |
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Term
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Definition
| One of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the polychaetes. |
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Term
| What's the sister group to the annelida and why is it confused with annelida? |
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Definition
| Sipuncula (peanut worms), body wall somewhat similar to annelids (though unsegmented) |
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Term
| Which groups that weren't considered to be part of the annelida now are and why? |
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Definition
| Echiuridae and pogonophora, molecular data. |
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Term
| The leeches (true leeches and false leeches) are part of what group? |
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Definition
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Term
| What defines leeches? Difference between the groups of leeches? |
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Definition
| Loss of setae, fixed segments, anterior sucker. Hirudinea=true leeches (34 segments, suckers on both ends). Acanthobdellida (27 segments, only posterior sucker) and Branchiobdellida (14-15 segments, only anterior sucker) |
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Term
| How do oligochaetes reproduce |
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Definition
| Hermaphroditic sexual, stick to each other through secretions of the clitellum and transfer gametes. Clitellum then secretes cocoon which picks up gametes and slips off worm and seals. Young undergoes direct development |
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Term
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Definition
| A paraphyletic class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many setae |
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Term
Sedentaria consists only of polychaetes and errantia consists of clitellata and echiurida. Together sedentaria and errantia constitute 100 percent of the annelid species. True or false? |
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Definition
| Its the other way around. Also, the class Chaetopteridae sits outside of the sedentaria and errantia so they don't constitute 100 percent |
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Term
| Name key features of chaetopteridae |
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Definition
| metameric body with biramous appendages, some tagmatisation (fans etc), |
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Term
| What features of errantia allow for them to be mobile predators and scavengers? |
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Definition
| Retractile prostomium with more derived sensory organs, eversible pharynx and sometimes chitinous jaw, notopodium and neuropodium. |
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Term
| Is parapodia present in sedentaria? |
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Definition
Usually but reduced, used to anchor/ for respiration
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Term
| defining characteristics of oligochaetes? |
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Definition
| Lack parapodia, have constant clitellum, direct development |
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Term
| What constitutes the foregut, midgut and hindgut? |
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Definition
F- buccal cavity, pharynx, crop, gizzard
M- Secretory (digestive enzymes, absorption)
H- excretory |
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Term
| T or F? Derived have ventral nerve chord, basal have bilateral nerve chord? |
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Definition
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Term
| Earthworms have fused nerve chords that can be myelinated? |
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Definition
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Term
| Segmentation increases efficiency of motion. This is because the longitudinal muscles and the circular muscles are ___ |
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Definition
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Term
| Sedentaria have solid palps, eyes and lateral antennae. True or false? |
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Definition
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Term
| What polychaetes are in sedentaria? |
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Definition
| tube worms (siboglinidae) |
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Term
| What feature of lugworms help them move water past their gills and also snare prey down into their holes? |
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Definition
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Term
| Do echiurids exhibit segmentation? |
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Definition
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Term
| The only monophyletic clade of Clitellata is: |
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Definition
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Term
| How many superficial rings are in each segment of a leech? Also what properties do they have to help facilitate their feeding mechanisms? |
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Definition
3.
Anaesthetic and anti-coagulant. |
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