中国红树林植物白骨壤上的斜瘿螨属一新种(蜱螨亚纲,瘿螨总科)

A NEW SPECIES OF ACARALOX (ACARI,ERIOPHYOIDEA) INFESTING MANGROVE,AVICENNIA MARINA (FORSK.) VIERH.,FROM CHINA

记述红树林植物白骨壤上的瘿螨亚科Eriophyinae斜瘿螨属Acaralox 1新种:白骨壤斜瘿螨Acaralox marinae sp.nov.,给出了斜瘿螨属的分种检索表。

In this paper, a new species of Acaralox Keifer （Eriophyidae, Eriophyinae）, namely Acaralox marinae Li sp. nov., infesting mangrove Avicennia marina （Forsk.）Vierh. （Verbenaceae）, is described and illustrated from South China. All measurements are given in μm. The type specimens are deposited in the College of Agriculture, Guangxi University. A key to the species of Acaralox from the world is provided.Key to Acaralox species in the world1.Empodium 7 or 8-rayed, coxal area with short linesAcaralox bambusae Kuang, 2002Empodium 5-rayed, coxal area with granules22.Shield design with many short lines at each lateral side, dorsal annuli smoothAcaralox marinae sp. nov.Shield design with granular at each lateral side, dorsal annuli with rounded or elliptical microtubercles Acaralox harperi Keifer, 1966 Acaralox marinae sp. nov. （Figs. 1-6）Female. Body spindleform, ivory-whitish, 164.0-236.0 long, 51.5-55.5 wide, 40.0-55.5 thick. Gnathosoma 28.5 long, projecting obliquely down. Prodorsal shield：frontal lobe absent; 30.0 long, 40.0 wide; shield design with many short lines at each lateral side; median line incomplete, discontinuous, 1/5 at basal and 1/5 at anterior absent, respectively; admedian lines complete; submedian lines incomplete, absent 1/7 at basal and 2/7 at anterior. Scapular tubercles and scapular setae very near rear shield margin, 20 apart, scapular setae （sc） 7.5, projecting posteriorly. Coxae： with a sternal line, coxal area with granules; anterolateral setae on coxisternum Ⅰ （1b） 13.5, proximal setae on coxisternum Ⅰ （1a） 32.0, proximal setae on coxisternum Ⅱ （2a） 43.5. Legs： segments and setae normal; leg Ⅰ 31.5, femur 9.5, basiventral femoral setae （bv） 15.0; genu 4.5, antaxial genual setae （l″） 22.5; tibia 7.5, paraxial tibial setae （l′） 6.5, located at basal 1/3; tarsus 7.5; tarsal empodium simple, 5-rayed, tarsal solenidion ending as small knob; leg Ⅱ 28.5, femur 9.0, basiventral femoral setae （bv） 12.0; genu 4.5, antaxial genual setae （l″） 13.0; tibia 6.0, tarsus 7.0; tarsal empodium simple, 5-rayed, tarsal solenidion ending as small knob. Opisthosoma： dorsum with broad longitudinal dorsal furrow; annuli subequal dorsoventrally, 52-59 annuli, dorsal annuli smooth, ventral annuli with round microtubercles; setae c2 35.0, on ventral annulus 9; setae d43.0, on ventral annulus 24; setae e 20.0, on ventral annulus 38; setae f 28.5, on 6th ventral annulus from rear. Setae h1 present. Female genitalia 12.0 long, 21.0 wide, coverflap with 14 longitudinal ridges; proximal setae on coxisternum Ⅲ （3a） 16.5. Male. Unknown.Holotype ♀, paratypes 14 ♀♀, Beihai City, Guangxi Zhuangzu Autonomous Region, 5 Apr. 2007, collected by LI De-Wei and LAN Xiao.Host. Avicennia marina （Forsk.）Vierh. （mangrove, Verbenaceae）. Mites are vagrant on the undersurfaces of the leaves, no visible damage.Etymology. The species name is derived from the name of the host plant.Note. This species is similar to A. bambusae, but can be separated from the latter by prodorsal shield without frontal lobe, shield design with many short lines at each lateral side, admedian lines complete; dorsal annuli smooth and empodium 5-rayed （in A. bambusae, prodorsal shield with frontal lobe, without short lines at each lateral side, admedian lines incomplete; dorsal annuli with rounded microtubercles and empodium 7 or 8-rayed）. The new species is also similar to A. harperi, but can be differentiated from the latter by shield design with many short lines at each lateral side, dorsal annuli smooth （in A. harperi, shield design with granular at each lateral side, dorsal annuli with rounded or elliptical microtubercles）.