Best invertebrate zoology books according to redditors

The day I taught this section in invert bio I was so geeking out about this fact. All the students totally knew it was gonna show up on the test. Cause this fact is MADE OF AWESOME.

Also, good source is the textbook by Pechenik.

http://thevenominterviews.com/2017/10/18/are-hognose-snakes-venomous/

What does it mean to be “Venomous”?

Without getting into the whole poisonous-versus-venomous debate, most definitions of venomous are pretty consistent:

• “(of an animal, especially a snake) secreting venom; capable of injecting venom by means of a bite or sting” — oxforddictionaries.com
  
• “(of an animal) having a gland or glands for secreting venom; able to inflict a poisoned bite, sting, or wound” — dictionary.com
  
• “producing venom in a specialized gland and capable of inflicting injury or death” — merriam-webster.com
  
  Venomous Reptiles and Their Toxins defines venom as “A secretion produced in specialized cells in one animal, delivered to a target animal through the infliction of a wound and that disrupts endophysiological or biochemical processes in the receiving animal to facilitate feeding, defense or competition by/of the producing animal.”
  
  
  and if you don't know who Ray Morgan is and what The Venom Interviews are, I'd highly suggest doing some research. It would be ludicrous to argue against the people who actually advance this hobby in the field and not base your opinion on a wikipedia article.

YES!

The textbook I was taught from when taking Marine Invertebrate Biodiversity during undergrad. I still have the copy I bought (6th edition). It's really well written, easy enough to understand, and fairly well organized. It's strengths are in explaining the phylogenetic differences between similar clades and our current understanding of how evolution of the invertebrates occurred.

When I was graduating, one of my favorite books was Ruppert and Barnes - Invertebrates zoology

What exactly do you want to know? If you have a specific topic (evolution, anatomy, etc) you should probably search for that. Otherwise, if you only want a general overview of Annelid biology, mabybe have a look into more general literature, like Ruppert's Invertebrate Zoology and follow the cited literature to specific topics. Maybe even the cited literature in the Wikipedia article can help you.