Definition of Key Terms

   Pseudocoelum

A pseudocoelom is a fluid-filled body cavity in which mesoderm lines only the outer edge of the developing blastocoel. No peritoneal lining develops.

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 https://biologydictionary.net/pseudocoelomate/ 

   Hydrostatic Skeleton

A hydrostatic skeleton or hydroskeleton is a structure found in many soft-bodied animals consisting of a fluid-filled cavity, the coelom in this case the pseudocoelum, surrounded by muscles.

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https://sciencing.com/advantages-disadvantages-hydrostatic-skeleton-5521715.html 

Parasitic

An animal or plant that lives on or in another animal or plant of a different type and feeds from it.

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https://www.medicalnewstoday.com/articles/220302.php

    Free living

An organism that lives independently of other organisms rather than part of a symbiotic or parasitic relationship.

     Penial spicules

Two small, contractile penial sacs open into the cloaca on dorsal side. Each sac secretes and contains a small needle-like penial or copulatory seta or spicule of cuticle. During copulation, the spicules protrude out to keep the female's vulva open.

    Cuticle

The cuticle is an extracellular matrix consisting predominantly of small collagen-like proteins that are extensively crosslinked. In other words, the cuticle is the outermost layer of the skin epidermis.

     Amphids

Amphids are the principal olfactosensory organs of nematodes

Plasmids

Sensory Organs located near the anus that function in chemo reception. 





View the cite below for additional key terms: 
Link: http://www.biologydiscussion.com/plants/reproductive-system-and-life-cycle-in-ascaris-with-diagram/2703