Sipunculids

Question 1

Sipunculid Taxonomy

Answer 1

Annelida

Question 2

Sipunculid common name

Answer 2

Peanut worms

Question 3

Sipunculid defining characteristics

Answer 3

Eversible, retractable introvert
Multicellular urns in coelomic fluid: accumulate particulate wastes
Anterior tentacles connected to compensatory sacs that pump fluid into tentacles and store fluid when tentacles retract

Question 4

Sipunculid: coelomic urns

Answer 4

Multicellular bodies in coelomic fluid specialized for accumulating particulate wastes

Question 5

Sipunculid: compensatory sacs

Answer 5

Pump fluid into anterior tentacles and store fluid when tentacles retract

Question 6

Sipunculid: feeding

Answer 6

Deposit-detritus feeding

Question 7

Sipunculids: nuchal organs

Answer 7

Chemoreceptors

Question 8

Sipunculid: habitat

Answer 8

Marine

Question 9

Sipunculid: anatomy

Answer 9

Anterior tentacles, dorsal and ventral retractor muscles, coelom, introvert

Question 10

Sipunculid: body wall

Answer 10

Non-living cuticle, epidermis, epidermal glands, connective tissue, circular muscle, longitudinal muscle, peritoneum, coelom

Question 11

Sipunculid: introvert

Answer 11

Completely retractable
Mouth on end
Introvert retractor muscles
Mucus covered tentacles