Abstract
In Oniscidea, the marsupium is a ventral pouch where the offspring develop independently of an external water source. The marsupium is formed by five pairs of overlapping oostegites that develop in the females during their reproductive period. In this study, ovigerous females of 35 species were dissected, their oostegites were extracted, and the intra-marsupial offspring were counted. Two marsupium forms were recognized: distended, in which the oostegites protrude distally in relation to the sternites; and non-distended, in which the oostegites are parallel to the sixth and seventh sternites. Armadillidium nasatum, A. vulgare, Pudeoniscus birabeni, Circoniscus gaigei and Cubaris murina, conglobating species with a non-distended marsupium, and Neotroponiscus daguerri and N. carolii, non-conglobating species with a distended marsupium, have a concavity on the ventral floor of the 6th and 7th pereionites, here called the marsupial extension. This is the first record of a marsupial extension which extends beyond the area formed by the oostegites in Oniscidea.
Conglobation; marsupium; oostegites; woodlice
- Akahira, Y. 1956. The function of thoracic processes found in females of the common woodlouse, Porcellio scaber Journal Faculty of Science, Hokkaido University, 12:493-498.
- Hoese, B. 1984. The marsupium in terrestrial isopods. Symposium of the Zoological Society of London, 53:65-76.
- Hoese, B. and Janssen, H.H. 1989. Morphological and physiological studies on the marsupium in terrestrial isopods. Monitore Zoologico Italiano (N.S.) – Monography, 4:153-173.
- Humason, G.L. 1972. Animal Tissue Techniques. San Francisco, W.H. Freeman and Company, 641p.
- Milatovič, M.; Kostanjšek, R. and Štrus, J. 2010. Ontogenetic development of Porcellio scaber: staging based on microscopic anatomy. Journal of Crustacean Biology, 30(2):225-235.
- Patane, L. 1940. Sulla struttura e la funzione del marsupio di Porcellio laevis Latreille. Archivio Zoologico Italiano, 28:271-296.
- Quadros, A.; Araujo, P.B. and Sokolowicz, C.C. 2008. Reproduction of neotropical isopods (Crustacea: Oniscidea) in southern Brazil: similarities and differences relative to temperate and tropical species. p. 81-90. In: M. Zimmer, F. Charfi-Cheikhrouha and S. Taiti (eds), Proceedings of the International Symposium of Terrestrial Isopod Biology. Shaker Verlag, Aachen.
- Suzuki, S. and K. Yamasaki. 1989. Ovarian control of oostegite formation in Armadillidium vulgare (Crustacea, Isopoda). Zoological Science, 6:11-32.
- Schmalfuss, H. 1984. Eco-morphological strategies in terrestrial isopods. Symposium of the Zoological Society of London, 53:49-63.
- Schmidt, C. 2002. Contribution to the phylogenetic system of the Crinocheta (Crustacea, Isopoda). Part 1 (Olibrinidae to Scyphaidae s. str). Mitteilungen aus dem Museum für Naturkunde in Berlin, Zoologische Reihe, 78: 275-352.
Publication Dates
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Publication in this collection
27 Jan 2015 -
Date of issue
Dec 2011
History
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Received
31 Mar 2011 -
Accepted
30 Sept 2011
