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- Armadillidium nasatum, Tom, http://www.pbase.com/dang
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Identification |
Reprinted from Richardson, H. 1905. Isopods of North America. Bulletin No. 54 of the United States National Museum.
Locality — Schenectady, New York. Found in greenhouses.
Body ovate, contractile into a ball; nearly twice as long as wide, 5 mm.: 9 mm.
Head nearly three times as wide as long, with a small, median V-shaped notch. The epistome is triangular in shape; the broad, basal part being anterior and projecting in front of the head, giving the head the appearance of having a broad, quadrate median lobe. The eyes are small, composite, and situated in the antero-lateral angles. A groove separates the antero-lateral margin of the head from the antennal lobe, which is large and conspicuous and well rounded. In this groove the antennae lie. The first pair of antennae are small and inconspicuous. The second pair have the first article short; second is twice as long as the first; the third is a little shorter than the second; fourth is equal in length to the second; the fifth is twice as long as the fourth. The flagellum is composed of two long, subequal articles. The second antennae extend to the posterior margin of the first thoracic segment.
The first segment of the thorax is a little longer than any of the following segments, and has the antero-lateral angles produced forward to surround the head, and the post-lateral angles produced backward. The epimera are not distinct in any of the segments.
The first two segments of the abdomen have the lateral parts covered by the seventh thoracic segment. The three following segments continue the oval outline of the body. The sixth or terminal segment is subtriangular, with sides a little concave and apex rounded. The basal segment or peduncle of the uropoda is not visible in a dorsal view. It is large and somewhat quadrate. The outer branch occupies all the space between the lateral part of the fifth abdominal, segment and the terminal abdominal segment. The outer branch is broad posteriorly and well rounded. The inner branch extends to the extremity of the outer branch and to the extremity of the abdomen.
All the legs are ambulatory in character.
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Following served from Armadillidium nasatum, Tom, http://www.pbase.com/dang |
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Updated: 2024-04-24 05:54:06 gmt
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