B u r r o w morphology of t w o callianassid shrimps, Callianassαjaponica Ortm a n n, 1891 a n d Callianα ssa sp. (= C.japonica: d e M a n, 1928)( De c a p o da: T halassinidea) Ak.io T a m ak .i a n d Hiroshige U e n o Abstract. -Polyester resin casts of b u町 o w s of the thalassinidean shrimps, CαI I却 nassajaponicαOrtm a n n, 1891 and Callianassα s p . ( = C.jα r . ponica: de Man, 1928), were collected on in絶 叫idal 個 且. dflats in western Kyushu, Japan. T he difference in basic architecture of

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... the burrows of these two species w a s obvious: the burr o w of C. japonica had alternating shafts a n d chambers, with a single surface opening, while that of Cαlliα nα ssα sp. w a s basically Y-shaped, with two surface openings. T h e average dimensions of individual components of 也 eburrowsare given for each 叩 eciesandp。 回:ible f1皿ctions of these components, especial1y with regard to the shrimps' trophic m o d es , are discussed..