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Phylum NEMERTEA – nemerteans, nemertines - page 3 / 6

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ARTHROPODA – "jointed feet"

General characteristics:

Bauplan:

coelomate, 2 anterior head appendages, 3 cephalic appendages, segmentation with specialization, cephalon, thorax, abdomen, walking appendages (perieopoda), abdominal appendages (pleopoda)

Biological features:

Hard cuticular exoskeleton, chitin (n-acetyl glucosamine), molting to grow, terminal vs. continuous ecdysis, step function in growth, complete vs. incomplete metamorphosis.

TERMS

Cuticle: tough exoskeleton of arthropods. Composed of chitin, embedded with metals, i.e., calcified, polyphenolics, etc.

Chitin: complex arrangement of n-acetylglucosamine into support molecules for exoskeleton.

Parasitic castration: Theda Bara as "The Vamp," or Marlene Dietrich as "the blue angel." Case where parasitism results in castration of the host. Examples from many host-parasite relationships.

Parasitoid: a parasite that kills its host. Some wasps.

Metamorphosis:  Kafka novel on the cockroach. Complete metamorphosis is a radical change, i.e., from a maggot to fly.  Incomplete metamorphosis is less radical, the larval instar resembles the adult (without wings, etc.).

Nauplius, nauplii: larval stage of copepods, barnacles, other primitive crustaceans.

Cyprid: second larval stage of barnacles (resembles some cyprid ostracods hence the term).

Epicaridean larva: characteristic isopod larva of the suborder Epicaridea.

Mandibles, Maxillae: Mouthparts used in feeding or attachment.

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