By O.A. Jones (Eds.)
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J. BRUCE Fig. 5. Ischnopontonia lophos (Barnard), female; Ras Iwatine, Mombasa. (A) Lateral aspect; ( B ) frontal aspect; and ( C ) dorsal aspect. 4. Adaptations to Confined Spaces a. The body is greatly swollen. ]. b. The body is subglobular. This extreme stage is shown only by Paratypton (Fig. 6), which occupies a very small cystlike chamber in Acropora corals where very little free movement is possible (Bruce, 1969a). 5. Adaptations to Exposed Situations Such adaptations are relatively few in the Pontoniinae, as most species are cryptic in their habits and are not found in exposed situations.
These are both active, free-living species, the former a micropredator and the latter well able to prey upon other shrimps about half its own size. These species have a slenderly built body, with a well-developed, strongly toothed rostrum, and with slender elongated pereiopods. The ambulatory pereiopods are provided with a slender, simple dactylus. All ranges of variation exist between these unspecialized species and the most highly modified genera, all of which, as far as is known, are not free-living.
Crustaceana 4, 47. Humes, A. G. (1962b). Bull. Mus. Comp. y Harvard Univ. 128, 35. Humes, A. G. (1973). Zool. Anz. 190, 312. Humes, A. , and Frost, B. W. ( 1964). Cah. Oceanogr. 6, 131. Humes, A. , and Ho, J. S. (1967). Proc. S. Nat. Mus. 122, (3586), 1. Humes, A. , and Ho, J. S. (1968a). Bull. Mus. Comp. Zool, Harvard Univ. 136, 353. Humes, A. , and Ho, J. S. (1968b). Bull. Mus. Comp. Zool, Harvard Univ. 136, 415. Humes, A. , and Stock, J. H. (1972). Bull Zool. , Univ. Amsterdam 2, 121. Humes, A.