Isopoda


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Related to Isopoda: Oniscidea

Isopoda

[ī′säp·ə·də]
(invertebrate zoology)
An order of malacostracan crustaceans characterized by a cephalon bearing one pair of maxillipeds in addition to the antennae, mandibles, and maxillae.

Isopoda

 

an order of higher crustaceans. The body, which is flattened in a dorsoventral direction, is from 0.1 to 27 cm long (1–2 cm usually). The eyes are sessile. One or, less frequently, two thoracic somites are fused with the head, and one or several abdominal somites are fused with the telson. The first pair of thoracic limbs have been transformed into maxillipeds. The remaining seven pairs are uniramose and are of approximately the same length and structure. The abdominal limbs are platelike and partially transformed into gills. The heart is in the abdominal section. Development is mostly direct. The female carries the embryos and young in a brood pouch formed by processes of the thoracic limbs.

There are approximately 4,500 species of isopods, distributed primarily in seas but also encountered in freshwaters and on dry land. Many species are eaten by fish. Mesidothea entomon damages fishnets and the fish caught in them; species of the genus Limnoria gnaw holes in wood, destroying wooden structures.

References in periodicals archive ?
By analyzing the faunal structures with the trap method, the high density of Isopoda in the OC was the most evident aspect of the soil fauna evaluation, indicating areas with low pesticide use and with high organic matter content (Karanja et al.
Em agosto mesmo padrao ocorreu no estadio avancado, totalizando oito grupos, sendo estes: Acari, Araneae, Coleoptera, Diptera, Formicidae, Hymenoptera, Isopoda e Poduromorpha (Tabela 2).
Abundance of arthropods by different methods in 4 year and 8 year old oil palm plantation at Sungai Sedu Estate Arthropods 4 Year old oil palm plantation Pitfall Litter Sweep trap analysis net Insecta Coleoptera 552 551 247 Collembola 530 276 16 Dermaptera 114 157 1 Diplura -- -- -- Diptera 181 7 194 Hempitera 15 10 194 Homoptera 5 10 367 Hymenoptera 4581 1791 1062 (Formicidae) Hymenoptera 13 33 51 (Others) Isoptera 38 3 3 Lepidoptera 44 11 64 Neuroptera 8 1 -- Odonata -- -- 9 Orthoptera 1021 325 561 Psocoptera -- 3 -- Thysanoptera 1 -- -- Unidentified 3 48 4 insects Chilopoda 81 32 1 Diplopoda 19 48 -- Crustacea Amphipoda 234 9 -- Isopoda 22 22 -- Arachnida Acarina 116 321 5 Araneida 489 95 1254 Chelonethida -- 2 -- Phalangida 7 9 1 Total 8074 3764 4034 G.
Order Pulmonata, Hymenoptera, Coleoptera, Isopoda and Dermaptera were the most abundant.
f kuhniana PELECYPODA 102 1 1 2 ANELIDA 103 11 11 2 POLYCHAETA Nereidae 104 CRUSTACEA TANAIDACEA 105 GAMMARIDAE 106 ISOPODA Sphaeromatidae 107 DECAPODA Palaemonidae Macrobrachium 108 23 28 250 heterochiurs Macrobrachium 109 1 panamense Grapsidae Sesarma 110 Ocypodidae Uca 111 Xanthidae 112 TOTAL 3067 1923 398 Centro TAXA Guadalito Estero Desembocadura ARTHROPODA INSECTA EPHEMEROPTERA Baetidae Morfotipo A Cloedes sp 4 Americabaetis sp 2 Camelobaetidius sp Baetodes sp Leptophlebiidae Simothraulopsis c.
Crustacea Isopoda Bopysus squilarum Probopyrus pandalicola Phylum / Huesped Autor(es) Clase Trematoda Hypolobocera sp.
2) was comprised of Isopoda (34%, n = 278), Araneae (26%), and Collembola (18%).
Por su parte, los ocho ordenes restantes de Insecta, junto con Acari, Isopoda, Polydesmida y Pseudoescorpiones, mostraron un porcentaje de captura menor al 1% (Tabla 1), razon por la cual, el analisis se concentro en los siete ordenes mas abundantes.
Fauna of symbiotic and parasitic crustaceans (Copepoda, Isopoda, Cirripedia, Amphipoda) from the benthic invertebrates of the White Sea and Arctic Seas (In Russian with English summary).