Effect of forced fasting on magnesium and manganese regulation in a terrestrial isopod,Porcellio spinicornis say (Porcellionidae, Isopoda, Crustacea)

Field data from a demographic study of the terrestrial isopod Porcellio spinicornis Say were analyzed and compared with laboratory data reported by McQueen and Carnio. On the study area, which covered 482.8 m2, it was observed that reproduction began when average temperatures were > 13 °C, and that about 86% of the individuals produced one brood and about 30% produced two broods. During 1972, 25 654 offspring were produced and during 1973, 27 664 offspring resulted from reproduction, which took place during May, June, July, and August. By October of both years, these animals attained sizes ranging from 10 to 30 mg and exhibited 42 to 47% survivorship. During the next summer, females grew to between 30 and 50 mg and males to between 20 and 40 mg, and survivorship ranged from 15% in May to 2% in August. During the third summer, females attained sizes ranging from 80 to 100 mg and males from 40 to 70 mg. Survivorship during this period ranged from 1% in May to 0% in August. All rates of growth, reproduction, and survival, as well as reproductive periodicity, agreed with independent laboratory studies conducted under controlled conditions. During the 3 years studied the field population remained relatively constant and appeared to be limited by temperature conditions.

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Purification and Properties of Androgenic Gland Hormone from the Terrestrial Isopod Armadillidium vulgare

ZOOLOGICAL SCIENCE ◽

10.2108/zsj.14.837 ◽

1997 ◽

Vol 14 (5) ◽

pp. 837-842 ◽

Cited By ~ 38

Author(s):

Atsuro Okuno ◽

Yuriko Hasegawa ◽

Hiromichi Nagasawa

Keyword(s):

Androgenic Gland ◽

Terrestrial Isopod ◽

Armadillidium Vulgare ◽

Purification And Properties

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Isolation and properties of androgenic gland hormone from the terrestrial isopod, Armadillidium vulgare

General and Comparative Endocrinology ◽

10.1016/0016-6480(87)90209-7 ◽

1987 ◽

Vol 67 (1) ◽

pp. 101-110 ◽

Cited By ~ 51

Author(s):

Yuriko Hasegawa ◽

Kazu Haino-Fukushima ◽

Yasutoshi Katakura

Keyword(s):

Androgenic Gland ◽

Terrestrial Isopod ◽

Armadillidium Vulgare

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“Candidatus Bacilloplasma,” a Novel Lineage of Mollicutes Associated with the Hindgut Wall of the Terrestrial Isopod Porcellio scaber (Crustacea: Isopoda)

Applied and Environmental Microbiology ◽

10.1128/aem.02468-06 ◽

2007 ◽

Vol 73 (17) ◽

pp. 5566-5573 ◽

Cited By ~ 58

Author(s):

Rok Kostanjšek ◽

Jasna Štrus ◽

Gorazd Avguštin

Keyword(s):

Electron Microscopy ◽

Sequence Similarity ◽

Mycoplasma Hominis ◽

Sister Group ◽

Phylogenetic Position ◽

Rrna Gene ◽

Porcellio Scaber ◽

Terrestrial Isopod ◽

Transmission Electron ◽

A Cell

ABSTRACT Pointed, rod-shaped bacteria colonizing the cuticular surface of the hindgut of the terrestrial isopod crustacean Porcellio scaber (Crustacea: Isopoda) were investigated by comparative 16S rRNA gene sequence analysis and electron microscopy. The results of phylogenetic analysis, and the absence of a cell wall, affiliated these bacteria with the class Mollicutes, within which they represent a novel and deeply branched lineage, sharing less than 82.6% sequence similarity to known Mollicutes. The lineage has been positioned as a sister group to the clade comprising the Spiroplasma group, the Mycoplasma pneumoniae group, and the Mycoplasma hominis group. The specific signature sequence was identified and used as a probe in in situ hybridization, which confirmed that the retrieved sequences originate from the attached rod-shaped bacteria from the hindgut of P. scaber and made it possible to detect these bacteria in their natural environment. Scanning and transmission electron microscopy revealed a spherically shaped structure at the tapered end of the rod-shaped bacteria, enabling their specific and exclusive attachment to the tip of the cuticular spines on the inner surface of the gut. Specific adaptation to the gut environment, as well as phylogenetic positioning, indicate the long-term association and probable coevolution of the bacteria and the host. Taking into account their pointed, rod-shaped morphology and their phylogenetic position, the name “Candidatus Bacilloplasma” has been proposed for this new lineage of bacteria specifically associated with the gut surface of P. scaber.

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