Annelids

serially repeated units of annelid bodies

partitions between metameres

how does metamerism increase burrowing efficiency?

circular grooves that mark metameres

tiny chitinous bristles found in most annelids but absent in leeches

scientific name for earthworms

scientific name for leeches

chiefly marine and mostly benthic; some are pelagic in open seas

2 parts of annelid head

terminal portion of annelid bearing anus

where do new metameres form

mesodermal epithelium that lines body wall and \n forms dorsal and ventral mesenteries that cover all organs

how does annelid coelum form?

what type of outer cuticle do annelids have?

is the annelid digestive system segmented?

unique reproductive structure called a that is a ring of secretory cells found in a band around the body about one-third of the body length from the front end

how are members of clade clitellta classified reproductively?

when is the clitellum visible in leeches?

when do members of clade clitellata remain on the surface?

contractions of these muscles in the anterior end of earthworms lengthen the body to push the anterior end forward.

contraction of these muscles follows earthworm anchoring to shorten the rest of the body and pull the posterior end toward the tail.

Each oligochaete body segment usually has _____ pairs of chitinous setae

Oligochaete nutrition

located along the esophagus reduce calcium ion \n concentration in the blood and regulate acid–base balance in body fluids.

aids in handling of oligochaete food

thin walled area for food storage in oligochaetes

increases absorptive surface area

surround the intestine and synthesizes glycogen and fat much like a liver; can also have excretory role

what type of circulatory system do oligochaetes have?

\n serves as oligochaete aorta, delivers blood to brain, body walls, nephridia, and digestive tract

do oligochaetes have respiratory organs?

A ciliated funnel found anterior to intersegmental septum

where does the nephridial duct empty to the outside?

\n Each somite, except the first three and terminal one, have a pair of ________ that occupies parts of the adjacent somite.

Aquatic oligochaetes excrete toxic ___ while terrestrial worms excrete less toxic ______

produce urea and ammonia

do oligochaetes have a central nervous system and peripheral nerves?

connect around the pharynx to the ganglia of the ventral nerve cord running along the floor of the coelom

secreted by neurosensory cells in the brain and ganglia to regulate reproduction, secondary sex characteristics, and regeneration.

lens shaped appendages in oligochate epidermis that act in place of real eyes

tactile structures in integument to sense the surroundings

are earthworms monoecious or dioecious?

In what segments of Lumbricus are the reproductive structures located?

Place along which sperm from each worm is transported to the seminal receptacles of the other

what surfaces of earthworms align during reproduction?

when do young worms develop a clitellum

most common leech environment

nutrition of leeches

form superficial annuli that make leeches appear to have more segments than they really do

used in leeches for attachment to host

what do leeches lack that makes them lack distinct coelomic compartments?

found in freshwater leeches for ingesting small invertebrates as well as to suck blood from soft tissues

found in leeches considered to be true bloodsuckers, used to penetrate through tough skin

enzymes secreted from leech salivary glands to keep blood flowing

where does gas exchange occur in leeches?

how is leech reproduction classifies

is segmentation among annelids, arthropods, and chordates thought to be homologous?

structure that houses leech bacteria in extreme environments