caa a22 4500 386361509 CHVBK 20180307111917.0 cr unu---uuuuu 161130e198906 xx s 000 0 eng 10.4039/Ent121439-6 doi S0008347X00035549 pii (NATIONALLICENCE)cambridge-10.4039/Ent121439-6 CONSTANCY OF STYLOSTOME FORM IN TWO WATER MITE SPECIES [Elektronische Daten] Recent studies have suggested that the stylostome of parasitic larval water mites of the genus Arrenurus Dugès is a product of the mite, not the host. We tested this hypothesis by comparing stylostomes of the similar species Arrenurus novimarshallae Wilson and Arrenurus pseudotenuicollis Wilson formed in each of two mosquito species, Anopheles crucians Wiedemann and Anopheles quadrimaculatus Say: if the stylostome is produced by the mite, not the host, then stylostome form is likely to be constant in different host species parasitized by the mite. The stylostome of A. pseudotenuicollis is a short, broad, convoluted sac, and stylostomes within the two host species did not differ significantly. The stylostome of A. novimarshallae is a long, thin, convoluted tube, and although it was significantly smaller in A. quadrimaculatus than in A. crucians, its form remained constant. Dark pigment deposits around the stylostome's attachment point and along the tube may represent host defense that reduces stylostome growth in A. quadrimaculatus. Laboratory-reared A. novimarshallae often die after a brief engorgement period on A. quadrimaculatus but not on A. crucians. Thus, the stylostome of these two mite species has a consistent form in each of two host species, an observation compatible with the hypothesis that the stylostome is a product of the mite. In addition, the ease of distinguishing these two mite species on the basis of stylostome morphology attests to the potential value of the stylostome as a taxonomic character. Copyright © Entomological Society of Canada 1989 Lanciani Carmine A. Department of Zoology, University of Florida, Gainesville, Florida, USA 3261 1 and Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1 Smith Bruce P. Department of Zoology, University of Florida, Gainesville, Florida, USA 3261 1 and Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1 The Canadian Entomologist Cambridge University Press 121/6(1989-06), 439-443 0008-347X 121:6<439 1989 121 TCE https://doi.org/10.4039/Ent121439-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent121439-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lanciani Carmine A. Department of Zoology, University of Florida, Gainesville, Florida, USA 3261 1 and Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1 NATIONALLICENCE 700 1- Smith Bruce P. Department of Zoology, University of Florida, Gainesville, Florida, USA 3261 1 and Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 121/6(1989-06), 439-443 0008-347X 121:6<439 1989 121 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge