. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 419 ill M. being armod with one broad low tubercle (in the sub- species dilata the propodus is armed with three acute teeth), while in J/, danielsi the propodus is armed with one large tooth and one bluntly ending, ti'uncate process, the dactylus being provided with two teeth at the base, the dactylus in M. tenax being armed with spines on the inner margin, of which the distal ones are the larger, and at the end with a large spine. This species differs from 2L lineatufi (Say) in having antennae somewhat short
. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 419 ill M. being armod with one broad low tubercle (in the sub- species dilata the propodus is armed with three acute teeth), while in J/, danielsi the propodus is armed with one large tooth and one bluntly ending, ti'uncate process, the dactylus being provided with two teeth at the base, the dactylus in M. tenax being armed with spines on the inner margin, of which the distal ones are the larger, and at the end with a large spine. This species differs from 2L lineatufi (Say) in having antennae somewhat shorter, in the fact that the propodus of the tirst pair of legs is provided with a bluntly ending process between the long tooth, situated about the middle on the inferior margin, and the articulation of the dactylus with the propodus, and in the longer outer branch of the caudal stylets, it being half as long as the inner branch, while in M. Uneatus it is only one-third the length of the inner one. Named for Mr. L. E. Daniels, b\' whom the specimens were col Fifi. 471.—MANCASEIXrS DANIELSI. Lew of first PAIR. X 143. 68. Genus Geoffroy. Mandibles with a palp. Last six pairs of legs with dactvlus uni- unguiculate. E3'es present. Body broad, depressed. Head small, narrower and shorter than first thoracic segment. Terminal segment of liody verv broad, not longer than broad. ANALYTIC.\L KEY TO THE OK THE (JENl'K ASELLUS. Propodus of first pair of legs armed with two triangular procesnes, one or both processes sometimes a strong spine. h. Uropoda almost as long as the terminal segment of the ))ody. Fypimera present on all the segments of the thorax, c. Head with lateral margins not produced in a lol)e on eitlier side. Second pair of antennae extend to the posterior margin of the fifth tlioracic seg- ment. First pair of antenna' extend to the end of the peduncle of the second antenn;e; fiagellum of fourteen articles. Asellus communis Say
Size: 1160px × 2155px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
