Cuticular surface structures in glyptonotus antarcticus — a marine isopod from the Ross Sea (Antarctica)

Meyer-Rochow, Victor Benno

doi:10.1007/bf01081935

Cited by 20 publications

(4 citation statements)

References 10 publications

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“…The studied individuals were conserved in test tubes with ethylic alcohol. The methods used in the SEM study were the same used for terrestrial isopods by other authors (Holdich and Lincoln, 1974;Schmalfuss, 1978Schmalfuss, , 1998Meyer-Rochow, 1980;Ziegler and Altner, 1995;Csonka et al, 2018). Thus, the isopods were dehydrated, fixed, and then covered with a 2 nm layer of gold using the Quorum Q T150 ES Magnetron Sputtering.…”

Section: Methodsmentioning

confidence: 99%

Cuticle structure of Carpathian endemic species: Trachelipus trilobatus (Crustacea, Isopoda, Oniscidea) described with the scanning electron microscope

Cupşa¹,

Costea²,

Cicort-Lucaciu³

et al. 2022

Studia UBB Biologia

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The cuticle is the interface between an animal and its environment; thus, it has a special importance. In Arthropods, the cuticle is not uniform, having numerous formations, which is also the case of epigeic terrestrial isopods. Our study presents data on cuticle surface morphology, obtained with a scanning electron microscope, of an endemic terrestrial isopod species, Trachelipus trilobatus. Here we present SEM images of some external morphological features of this species, which were previously described only at the light microscope. Although T. trilobatus was frequently encountered in caves, the aspect of its cuticle is characteristic for an epigeic isopod, presenting numerous micro-scales, spines, and tricorn sensilla, which are considered hygroreceptors. This fact proves that originally T. trilobatus is an epigeic species, which secondarily adapted to karst areas with caves. Nevertheless, it regularly leaves the caves and the limestone cracks and emerges on the soil surface. Therefore, T. trilobatus is able to receive information about environmental humidity, especially on the soil surface, which, when unfavorable, causes the species retreat into caves or cracks. Climatic fluctuations from the glacial periods could direct T. trilobatus to this environment and way of life, modifying its morphology, but not its cuticle.

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Section: Methodsmentioning

confidence: 99%

Cuticle structure of Carpathian endemic species: Trachelipus trilobatus (Crustacea, Isopoda, Oniscidea) described with the scanning electron microscope

Cupşa¹,

Costea²,

Cicort-Lucaciu³

et al. 2022

Studia UBB Biologia

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“…The cuticular microstructures of a few aquatic species of crustaceans like amphipods and isopods have been studied previously by SEM (e.g., Schmalfuss 1978;Meyer-Rochow 1980;Powell and Halcrow 1982;Holdich 1984;Laverack and Barrientos 1985;Platvoet 1985;Olyslager and Williams 1993;Halcrow and Bousfield 1987;Read and Williams 1991;Khalaji-Pirbalouty and Sari 2006;Zimmer et al 2009;Kaim-Malka 2010). The majority of these studies investigated the cuticular surface of Amphipoda, and only few attempts have been conducted to study the microscopic structures on the tegument surface of aquatic isopods (e.g., Wägele 1993;Escobar et al 2002;Brandt 1988;Kaim-Malka 2010).…”

Section: Discussionmentioning

confidence: 99%

The morphology, arrangement, and ultrastructure of a new type of microtrich sensilla in marine isopods (Crustacea, Isopoda)

Khalaji-Pirbalouty

2014

Zool. Stud.

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Background: Microtrich sensilla are a special type of cuticular structures found on the external surface of amphipod and isopod crustaceans. These cuticular microstructures, being important for systematic and phylogenetic studies, display a wide diversity of shapes and distribution among different taxa. Here, the microstructure of the cuticular surface of 11 marine isopod species was investigated by scanning electron microscopy. Results: On the dorsal and lateral sides of all the taxa examined, only one distinct type of microtrich sensillum was found in the regular rows. While this structure is very similar to that of the Ib microtrich type (sensu Crustaceana 13:100-106, 1988), however, it is distinct from the previous type, in which it has an elongate cuticular ring or specialized collar encircling the shaft base of the microtrichs. The findings indicate that different taxa of marine isopods may show a new type of microtrich sensilla differing in morphology and arrangement. Conclusions: The findings indicate that different taxa of marine isopods may show a new type of microtrich sensilla differing in morphology and arrangement.

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“…For example, Bathynomus giganteus (the largest living isopod, up to 460 mm long) lives within subtropical latitudes, but at depths of 600 to 1,200 m and in water temperatures of around 8.8 degrees C (Wetzer, 1986;Briones-Fourzan and Lozano-Alvarez, 1991). Another exceptionally large isopod, Glyptonotus antarcticus (up to 200 mm long), inhabits shallower (intertidal zone to 790 m), but very cold (at or below 0 degrees C) Antarctic waters (Meyer-Rochow, 1980). The giant amphipod Megacerdocus gigas (up to 570 mm in length) is known from the gut con tents of fish captured in cold waters (approximately 2 to 7 degrees C) between 245 and 600 m in the Sea of Japan and the north Pacific Ocean (Mukai, 1979;Mukai and Takeda, 1987).…”

Section: Ecology Environment and Maximum Size Potentialmentioning

confidence: 99%

The world's biggest trilobite—Isotelus rexnew species from the upper Ordovician of northern Manitoba, Canada

Rudkin

Young²,

Elias

et al. 2003

J. Paleontol.

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The largest known trilobite fossil, a virtually complete articulated dorsal shield of the asaphid Isotelus rex new species, has been recovered from Upper Ordovician (Cincinnatian, Richmondian) nearshore carbonates of the Churchill River Group in northern Manitoba. At over 700 mm in length, it is almost 70 percent longer than the largest previously documented complete trilobite, and provides the first unequivocal evidence of maximum trilobite length in excess of one-half metre. Comparisons with other fossil and extant members of the phylum suggest that in terms of maximum linear dimensions it was among the biggest arthropods ever to have lived. Sediments of the Churchill River Group were deposited in an equatorial epeiric setting and the extremely large size of I. rex n. sp. thus marks a striking example of low-latitude gigantism, in sharp contrast to the widespread phenomenon of “polar gigantism” in many modern marine benthic arthropods. Lack of extensive epibiontic colonization of the exoskeletal surface and the presence of large distinctive trace fossils in the same unit suggest that I. rex n. sp. may have been a semi-infaunal predator and scavenger that employed a shallow furrowing and probing mode of benthic feeding. The extinction of the isotelines (and virtually the entire asaphide lineage) at the end of the Ordovician cannot be related to the near contemporaneous achievement of exceptionally large adult size in some representatives. Failure to survive the terminal Ordovician extinction event was most likely a consequence of a pelagic larval life-style that proved ill-adapted to the rapid onset of global climatic cooling and loss of tropical shelf habitats.

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Cuticular surface structures in glyptonotus antarcticus — a marine isopod from the Ross Sea (Antarctica)

Cited by 20 publications

References 10 publications

Cuticle structure of Carpathian endemic species: Trachelipus trilobatus (Crustacea, Isopoda, Oniscidea) described with the scanning electron microscope

Cuticle structure of Carpathian endemic species: Trachelipus trilobatus (Crustacea, Isopoda, Oniscidea) described with the scanning electron microscope

The morphology, arrangement, and ultrastructure of a new type of microtrich sensilla in marine isopods (Crustacea, Isopoda)

The world's biggest trilobite—Isotelus rexnew species from the upper Ordovician of northern Manitoba, Canada

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