Pycnogonida

Definitions

  • WordNet 3.6
    • n Pycnogonida sea spiders
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Webster's Revised Unabridged Dictionary
    • n. pl Pycnogonida (Zoöl) A class of marine arthropods in which the body is small and thin, and the eight legs usually very long; -- called also Pantopoda.☞ The abdomen is rudimentary, and the triangular mouth is at the end of a tubular proboscis. Many of them live at great depths in the sea, and the largest of them measure two feet across the extended legs.
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Century Dictionary and Cyclopedia
    • pycnogonida A group of marine arthropod articulate animals, combining some characters of both Crustacea and Arachnida with others of neither of these classes; the sea-spiders. They have a four-segmented cephalothorax bearing four pairs of many-jointed legs ending in claws, and in the female a pair of additional appendages between the anterior legs; a rudimentary unsegmented abdomen; a tubular or proboscis-like mouth, simple or appendaged; four ocelli; no respiratory organs; and the sexes distinct. The palpi when present have from five to nine joints and end in a claw. The group has been variously rated as a family, suborder, order, subclass, and class, and has been called or placed in Arachnopoda, Araneiformia, Aporobranchia, Lævigrada, Nymphonacea, Pantopoda, Podosomata, Polygonopoda, Pseudarachna, Pycnogonata, Pycnogonidæ, Pycnogonidea, and Pycnogonides. Some are parasitic, others are found moving sluggishly among seaweeds. Leading genera are Pycnogonum, Phoxichilus, Nymphon, and Ammothea. See also cut under Nymphon.
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Chambers's Twentieth Century Dictionary
    • n.pl Pycnogonida pik-nō-gon′i-da a division of marine arthropods, the sea-spiders
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Etymology

Webster's Revised Unabridged Dictionary
NL., fr. Gr. thick crowded + knee
Chambers's Twentieth Century Dictionary
Gr. pyknos, thick, gony, the knee.