Origin, developmental changes and homologies of the stage morphostructures were considered according to their location in three morphogenetic fields. The first, or central, field forms at the prodissoconch I stage. It can be inherited by prodissoconch II and nepioconch stages in one taxa, or PD-II, N and dissoconch stages in others. The second, or postero-dorsal, field appears at the N stage, and the third field, or antero-dorsal, at the D stage.

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The location and structures of sex-pheromone-producing gland in female H.insularis were studied by EAG,GC,SEM,and TEM.These studies showed that thegland situate in the intersegmental membrane between the eighth and ninthabdominal segments,and is an eversible abdominal fold;Many plump cones disturbon the surface of the gland.The glandular cells of 2-day old virgin female H.insularis are arranged in one layer,among which the central cells are columnarepithelial cells and flat on two sides.The nucleus is irregular elliptical.There isevident conjugation between cells and the involution is more in the basal membraneof cell.Microvilli are distributed on the cytoplasmic membrane and linked withendocuticle on which there are many layers of chitin,and the outer cuticule is staineddeeper.The cell contains bubbles,mitochondria,glycogen deposits,roughendoplasmic reticulum and smooth endoplasmic reticulum.

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Central and postero-dorsal field morphostructures exhibit developmental sequences, or a system of characters which possess polarity, in contrast to adult characters applied in mytilid taxonomy.

與在貽貝分類學(xué)上應(yīng)用的成體特征相比，早期發(fā)育階段中央和背部后區(qū)的形態(tài)結(jié)構(gòu)顯示出很明顯的發(fā)育順序或特征變化規(guī)律www.youjizz.com在线视频。

Hume's should have rather poor supercilium/ crown contrast (as the supercilium should be off-white-buff rather than white) and have rather grey-black centres to coverts and tertials (offering reduced contrast with the mantle and also with the wing bars).

休氏柳鶯應(yīng)該有比較不明顯的眉線/頭側(cè)線對比（因?yàn)槊季€是略帶皮黃色的白色而非白色）国产主播秋霞，而且覆羽和三級飛羽中央是偏灰黑色，導(dǎo)致和背部與翼帶的對比比較不明顯50岁熟妇的呻吟声对白。

Totally 32 healthy New Zealand rabbits received design of 6 cm ×2 cm random flaps on trachelo-back and simultaneous implantation of central arterial and venous bundles of left ear as well as free PC chaffs of right ear into flaps, which formed in different time island-like PC flaps taking vascular bundle as pedicle.

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