MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
The aestivation chamber of the giant earthworm Glossoscolex bergi (Glossoscolecidae) in the subtropical rainforest of Misiones (Argentina)
Autor/es:
JORGE F. GENISE; LILIANA F. CANTIL; PABLO A. DINGHI; M. VICTORIA SÁNCHEZ; LAURA SARZETTI
Revista:
ICHNOS-AN INTERNATIONAL JOURNAL FOR PLANT AND ANIMAL TRACES
Editorial:
TAYLOR & FRANCIS INC
Referencias:
Lugar: Londres; Año: 2013 vol. 20 p. 116 - 119
ISSN:
1042-0940
Resumen:
Glossoscolex bergi (Glossoscolecidae) is a giant earthworm
from the rainforest of Misiones (Argentina). The large size of its
aestivation chamber and the meniscate burrows connected to it
allow us to describe morphological details and reinterpret some
characteristics of the fossil counterpart Castrichnus incolumis.
The concavity of menisci, either in the burrow or in those pellets
lining the chamber, shows concentric ridges and radiating striae
that result from the impression of the last segments of the body.
The meniscate burrows associated to the chamber are different
from described ichnospecies of Taenidium, because of the surface
texture of the meniscus. The aestivation chamber was produced
during an atypical four-month drought in a region that lacks a
seasonal climate. This suggests that Castrichnus incolumis would
be also an indicator of drought periods even in non seasonal
climates.