prosoma

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pro·so·ma

 (prō-sō′mə)
n.
The anterior of the two or three main divisions of the body of certain invertebrates, especially the cephalothorax of an arachnid.
[pro- + Greek sōma, body; see teuə- in Indo-European roots.]
pro·so′mal adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

prosoma

(prəʊˈsəʊmə)
n, pl -mas or -mata (-mətə)
(Zoology) zoology the head and thorax of an arachnid
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

pro•so•ma

(proʊˈsoʊ mə)

n., pl. -mas, -ma•ta (-mə tə)
an anterior body region, esp. the arthropod cephalothorax.
[1870–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Males in any population average about 80% of the prosomal width of the females (Shuster, 1979) and mature females are significantly heavier than mature males because of their larger size and added weight associated with numerous eggs within their prosomas (Leschen et al., 2006).
Prosomal-width-to-weight relationships in American horseshoe crabs (Limulus polyphemus): examining conversion factors used to estimate landings
At 0, 2, 4, 10, and 16 h after thermal incubation was terminated, the prosomas of five barnacles from each temperature treatment were dissected, frozen with liquid nitrogen, and stored at -80 [degrees]C for analyses of endogenous Hsp70 and ubiquitin conjugate (see methods outlined below).
After this time, the prosoma was removed from each barnacle, immediately frozen with liquid nitrogen, and stored at -80 [degrees]C for analyses of endogenous Hsp70 and ubiquitin conjugate (see methods outlined below).
Heat-shock response of the upper intertidal barnacle Balanus glandula: thermal stress and acclimation

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