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The trident is a small group of (usually three) spines found in harvestmen exclusively. It is located in front of the ocularium. It varies in size amongst species; in some it is completely absent, and in others it is enlarged considerably.
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The clypeus is the space between the anterior of the cephalothorax and the ocularium. It is found in most arachnids. It is connected to the labrum of the invertebrate, between the labrum and the face.
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may be preferred by some researchers in cases such as arachnids, where there is neither fossil nor embryonic evidence animals in this class have ever had separate heads and thoraxes, and where the
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The fovea is the centre of the cephalothorax and is located behind the head (only in spiders). It is often important in identification. It can be transverse or procurved and can, in some
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Smith, A. M. (1990c). Baboon spiders: Tarantulas of Africa and the Middle East. Fitzgerald
Publishing, London, pp. 138. Retrieved February 13, 2016.
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Gallon, R.C. (2008). "On some poorly known
African Harpactirinae, with notes on
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Arthropod
Collection and Identification: Field and Laboratory Techniques
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Eldra Pearl
Solomon, Linda R. Berg & Diana W. Martin (2004).
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is the region including cephalon and thorax, marked in yellow.
270:"The animal kingdom: an introduction to animal diversity"
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Marine Life of the North
Atlantic: Canada to New England
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103:, such as a heart and respiratory organs.) The word
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143:). This fusion of the head and thorax is seen in
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325:: CS1 maint: multiple names: authors list (
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224:, it may have the ornament of spines.
490:Sankey, John & Savory, Theodore.
67:fused together, as distinct from the
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409:. A & C Black, London. P.p. 19.
216:The ocularium is a "turret" for the
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99:contains organs atypical of a true
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19:For cephalothoracic humans, see
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63:, comprising the head and the
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527:. You can help Knowledge by
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220:found in most arachnids. In
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55:in some groups, is a
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107:is derived from the
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251:Arthropods portal
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155:(including
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59:of various
568:Categories
500:012619050X
466:Spiders...
342:"Glossary"
237:References
222:harvestmen
186:tarantulas
61:arthropods
321:cite book
212:Ocularium
163:and many
469:Archived
169:carapace
153:Hexapoda
274:Biology
228:Trident
198:Clypeus
157:insects
123:kephalé
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