Masatoshi Matsumasa

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Male fiddler crabs (genus Uca) have an enlarged major claw that is used during fights. In most species, 50% of males have a major claw on the left and 50% on the right. In Uca vocans vomeris, however, less than 1.4% of males are left-clawed. Fights between opponents with claws on the same or opposite side result in different physical alignment of claws,(More)
By electron microscopy of the coxal gills in two species of estuarine amphipod crustaceans, Grandidierella japonica and Melita satifragella, we found a patch-like, specialized tissue area which consisted of unique cells closely resembling the salt-excreting cells in the gill of the brine shrimp and so-called chloride cells in teleost gills. These cells were(More)
Sternomoera yezoensis has specialized sterna with 21 sternal gills in addition to six pairs of coxal gills. Despite a common high permeability to chloride ions, the epithelia of these two kinds of gills are diametrically opposed in the polarity of the cell membrane-mitochondria complex. The coxal gill epithelium (4-6 microm thick) is characterized by a(More)
A discoid organ, 'pereopodal disk (PD)', was found on the medial surface of the basipodite of each pereopod, except the third and the fourth, in an estuarine amphipod, Melita setiflagella. The silver methods showed that PD is an extrabranchial ion-permeable area of the body surface. The ultrastructural study revealed that PD is covered by a thin and soft(More)
On each lateral side of the cephalothorax segments, the adult Sinelobus stanfordi has a branchial chamber which contains an elongated bag-shaped gill and is covered by a thick branchiostegite. The ultrastructural study revealed that the inner surface of the branchiostegite is composed of a transporting-type epithelium which is morphologically distinct from(More)
Species identification of the early colonizers on a corpse, such as Calliphoridae and Sarcophagidae, provides useful information for estimating the postmortem interval (PMI). However, the morphology of adult flies and nymphs is very similar among species of the same genus, and for many forensic scientists accurate identification is very difficult within(More)
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