. Text book of zoology. Zoology. Fig. 164. Various parasitic Copepoda : 1 Nogagus borealis, male from the ventral side. 2 Oaligus rapax, female from above. 3 Chondracanthus gihhosug, female from below ((? the male). 4 Brachiella thynni, female. 5 Male of the same species (more enlarged), a^âa^ first and second antennae, / oandal appendages, hk second maxilla, kf maxilliped, p^âp^ firstâfourth pairs of legs, o egg-sac.â1, 2, 4, 5 after St enstrup and Ltitken, 3 after Claus. those limbs, which do not serye as organs of adhesion, atrophy, or become functionless; this applies especially to the tru
. Text book of zoology. Zoology. Fig. 164. Various parasitic Copepoda : 1 Nogagus borealis, male from the ventral side. 2 Oaligus rapax, female from above. 3 Chondracanthus gihhosug, female from below ((? the male). 4 Brachiella thynni, female. 5 Male of the same species (more enlarged), a^âa^ first and second antennae, / oandal appendages, hk second maxilla, kf maxilliped, p^âp^ firstâfourth pairs of legs, o egg-sac.â1, 2, 4, 5 after St enstrup and Ltitken, 3 after Claus. those limbs, which do not serye as organs of adhesion, atrophy, or become functionless; this applies especially to the true legs, which are either wanting, have â ^ S G degenerated to mere ves- tiges (Fig. 165£), or have become large thick ap- pendages, without setee, exhibiting only feeble in- dications of their original form. Often such parasitic Crustacea are provided with peculiar outgrowths, rendering their appearance still more striking. As a rule they are blind. Where the reduction is most ad- vanced, the entire animal. Fig. 165. A, Penella sagitta (parasitic on certain Fish), 9, natural size. B anterior end enlarged, y' first, p' fourth pair of legs, o egg-sac. C Rerpyl- lohius arcticus (parasitic on Chsetopods), 9 enlarged, 0 egg-sac. The irregularly lobed part is sunk in the body of the host.âAfter Steenstrup and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low, Marston
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
