Regeneration and Reproductive Strategies in Annelids

This set of flashcards covers key concepts related to regeneration, reproductive strategies, and unique characteristics of annelids discussed in the lecture.

What is the basic ability of annelids when it comes to appendages?

Annelids have the ability to regenerate lost appendages, such as parapodia and tail ends, but not the head.

Which segment of an annelid can regenerate the tail?

Only the anterior most segment is capable of regenerating the tail.

What type of reproduction is rare among annelids?

Asexual reproduction is rare among annelids.

What is transverse partitioning in annelids?

Transverse partitioning refers to a form of reproduction where segments of the annelid undergo autonomy to form clones that may detach.

What are dioecious organisms?

Dioecious organisms have separate sexes.

Where do gametes develop in most annelids?

Gametes develop in the coelomic cavity rather than in distinct gonads.

How are gametes released in marine annelids?

Gametes are released through nephritic pores or ruptured body walls.

What type of larva do annelids produce after fertilization?

They produce a trochophore larva, which is a planktonic larva.

What is the function of the trophosome in giant tube worms?

The trophosome is a specialized organ containing symbiotic bacteria that enable chemosynthesis.

What role do environmental cues play in the reproductive strategy of epitokes?

Environmental cues trigger atokes to transform into reproductive epitokes, which then swim to the surface for spawning.

What is a unique characteristic of the hemoglobin in giant tube worms?

Their hemoglobin can bind both oxygen and hydrogen sulfide, allowing them to survive in toxic environments.

What are zombie worms and what is their ecological role?

Zombie worms consume the bones of large marine animals, playing a critical role in decomposing and recycling nutrients.

What distinguishes leeches from other annelids in terms of reproduction?

Leeches are hermaphrodites with permanent gonads, capable of reciprocal sperm exchange.

What is the significance of a clitellum in earthworms?

The clitellum secretes a cocoon for fertilized eggs during reproduction.

How do leeches prevent blood pooling during their feeding process?

Leeches inject anticoagulants into their prey to keep blood flowing.

What is the life cycle of the palolo worm known for?

The palolo worm is known for its massive swarming reproductive events tied to lunar cycles.

What adaptations do echiuran worms have for feeding?

Echiuran worms have a ciliated proboscis used for collecting organic material from their environment.