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Cylisticus convexus (De Geer, 1778)
PORCELLIO ARMADILLOIDES
Oniscus convexus De Geer, 1778; Porcellio convexus Johnson; Porcellio spinifrons; Cylisticus laevis; Cylisticus spinifrons; Oniscus convexus

Life   Crustacea   Isopoda   Cylisticidae   Cylisticus

Cylisticus convexus, male
© Richardson, 1905 · 1
Cylisticus convexus, male

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  • Australian Faunal Directory

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Cylisticus convexus, male, dorsal
© Richardson, 1905 · 1
Cylisticus convexus, male, dorsal
Cylisticus convexus, male, telson
© Richardson, 1905 · 1
Cylisticus convexus, male, telson

Cylisticus convexus, abdomen
© Richardson, 1905 · 1
Cylisticus convexus, abdomen
Cylisticus convexus, male, second, pleopod
© Richardson, 1905 · 1
Cylisticus convexus, male, second, pleopod

Cylisticus convexus, uropod
© Richardson, 1905 · 1
Cylisticus convexus, uropod
Cylisticus convexus, seventh, leg
© Richardson, 1905 · 1
Cylisticus convexus, seventh, leg

Cylisticus convexus, male, second, pleopod
© Richardson, 1905 · 1
Cylisticus convexus, male, second, pleopod
Cylisticus convexus, second, maxilla
© Richardson, 1905 · 1
Cylisticus convexus, second, maxilla

Cylisticus convexus, second, antenna
© Richardson, 1905 · 1
Cylisticus convexus, second, antenna
Cylisticus convexus, posterior, lip
© Richardson, 1905 · 1
Cylisticus convexus, posterior, lip

Cylisticus convexus, maxillipeds
© Richardson, 1905 · 1
Cylisticus convexus, maxillipeds
Cylisticus convexus, mandibles
© Richardson, 1905 · 1
Cylisticus convexus, mandibles

Cylisticus convexus, mandible
© Richardson, 1905 · 1
Cylisticus convexus, mandible
Cylisticus convexus, lateral
© Richardson, 1905 · 1
Cylisticus convexus, lateral
Identification
Reprinted from Richardson, H. 1905. Isopods of North America. Bulletin No. 54 of the United States National Museum.

Localities. — Westwood, Hamilton County, Ohio; “Old Mill,” Devils Backbone, Hamilton County, Ohio; Miami Grove, Ohio; Piseco, New York; Rock island, Illinois; Springfield, Ohio; Columbus, Ohio; Clifton, Cincinnati, Ohio; Washington, District of Columbia; New York City; Norwich, New York; Warwick, Massachusetts; Kelley’s Island, Lake Erie; Syracuse, New York; Las Vegas Hot Springs, New Mexico; Saginaw, Michigan; also Sweden; Denmark; British Isles; Germany; Bohemia; Holland; Belgium; France; Turkey; and coast of Norway.

Found under bricks and boards; in woods, under logs; along roads, under stones; in wood sheds.

Body oblong-ovate, contractile into a ball, a little more than twice as long as wide, 5.5 mm. : 12.5 mm.

Head about twice as wide as long, 1.5 mm. : 3 mm., with the anterior margin produced in three lobes, the median lobe being small and triangular with apex acute, the lateral lobes being large and widely rounded. The eyes are small and composite and situated at the base of the antero-lateral lobes. The first pair of antennae are small and inconspicuous. The second pair have the first article short; the second is twice as long as the first; the third is equal in length to the second; the fourth is twice as long as the third; the fifth is one and a half times longer than the fourth. The flagellum is composed of two subequal articles. The second antennae extend to the posterior margin of the fourth thoracic segment.

The segments of the thorax are about equal in length. The epimera are not distinct from the segments. The lateral margins are straight. The antero-lateral angles of the first segment are produced forward to surround the head, and they extend to the base of the antero-lateral lobes of the head; the post-lateral angles of the first segment are produced backward in acute processes.

All six segments of the abdomen are distinct. The first two have the lateral parts covered by the seventh thoracic segment. The third, fourth, and fifth segments have the lateral parts produced to continue the oval outline of the body. The sixth or terminal segment is triangular with the apex produced in a long acutely terminating process. This segment is 2 mm. wide at the base and 2 mm. long to the end of the apical process. The basal article or peduncle of the uropoda extends just a little beyond the middle of the apical process of the terminal abdominal segment. The inner branch is 1 mm, long, and extends to the tip of the terminal abdominal segment. The outer branch is 1 mm. in length and extends a little more than half its length beyond the extremity of the abdomen.

All the legs are ambulatory in character.

In color it is a light brown with a longitudinal row of yellow spots either side at the place of union of the epimera with the segments. Between the median line and the longitudinal rows are markings of yellow wavy lines.

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Following modified from Australian Faunal Directory
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Updated: 2024-03-28 18:28:48 gmt
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