The central nervous system of Oniscus (isopoda)

Walker, Roland

doi:10.1002/cne.900620109

Cited by 22 publications

(17 citation statements)

References 15 publications

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“…In this paper these are callecl the "optic lobes", this terminology being in agreement with the views of Walker (1935). The optic nerves are those nerves connecting the outermost optic ganglion, the lamina ganglionaris, to the retina1 elements of the eye (Hanstrum 1947).…”

Section: Morphologymentioning

confidence: 72%

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The Morphology and Structure of the Brain of Orconectes Virilis (Hagen) (Crustacea, Decapoda)

Seabrook¹,

Nesbitt²

1966

Can. J. Zool.

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The morpholoff?. and histolngiml structure of the su~prawsophageal mnglionic mass are reported. The accessory nerve supplying motor fibers to the nlusclcs of t h e eyestalk, antennules, and antcnnne. aricl sensow 6bers to the antennules and antennae, is described lor the first time. I t is suggested that the term optic lobes be applied t o those structurcr; previorrs'ty descril>cd as the optic nerves in the stalked-eyed Crustacea. I t is further suggested that the term gatlglionic mass he applied to compn~~nri ganglia s~~c h as thc arthropod hrain. Sixry-one contlucting eIrqments are traced and iHusimt~l. 'i'his work substantiates the view that the protocerebrum and deutocerebrnm have a n ancient and clow relationship. Both are ronsitlered to be preoral. The aitocerehri~rn was recently acquir~tl by the ~upraoesophageal ganglionic mass and is postoral in origin.

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Section: Morphologymentioning

confidence: 72%

“…Of particular interest is the work of Walker (1935), who described the nervous system of Oniscus (Isopoda) and traced 66 neuron tracts within this system.…”

Section: Introductionmentioning

confidence: 99%

The Morphology and Structure of the Brain of Orconectes Virilis (Hagen) (Crustacea, Decapoda)

Seabrook¹,

Nesbitt²

1966

Can. J. Zool.

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“…Gräber (1933) analyzed the brains of O. asellus , P. scaber , and Armadillidium cinereum , and was not able to identify particular deutocerebral neuropils. Walker (1935) describes a small, untextured neuropil in the ventrolateral DC of O. assellus that he considers an olfactory lobe, although such function has not yet been confirmed in behavioral essays. A recent study on the brains of P. scaber , A. vulgare , and H. reaumuri again corroborates the general scheme that the DC in terrestrial isopods is considerably minimized in comparison to aquatic isopods (Harzsch et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…According to Hanström (1968), the PNT in the litoral species Ligia occidentalis interconnects only ipsilateral neuropils. Equally, in true terrestrial isopods (e.g., O. asellus and P. scaber) a chiasm is reported to be missing (Gräber, 1933; Walker, 1935), whereas in the amphipod G. pulex the PNT features a contralateral connection (Gräber, 1933). As this tract also shows a prominent chiasm in S. entomon , it is hard to draw a plausible conclusion with only limited possibilities of comparison, not to mention the unresolved phylogeny of the Isopoda.…”

Section: Discussionmentioning

confidence: 99%

“…In the latter the antennular morphology and aesthetasc ultrastructure has been examined by Pynnönen (1985). As for behavior, the few available studies on the isopod brain architecture have focused on terrestrial representatives with the most comprehensive accounts dating back to the early 20th century (Gräber, 1933; Walker, 1935; Hanström, 1968; Alexander, 1970; Warburg and Rosenberg, 1978). Classical morphological descriptions also exist for the brains of two fully terrestrial members of the Oniscidea, Armadillidium vulgare (Schmitz, 1989) and Hemilepistus reaumuri (Kacem-Lachkar, 2000) in both of which the deutocerebral olfactory pathway has eroded away.…”

Section: Introductionmentioning

confidence: 99%

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Brain anatomy of the marine isopod Saduria entomon Linnaeus, 1758 (Valvifera, Isopoda) with special emphasis on the olfactory pathway

Kenning

Harzsch

2013

Front. Neuroanat.

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Representatives of at least six crustacean taxa managed to establish a terrestrial life style during their evolutionary history and the Oniscidea (Isopoda) are currently held as the most successfully terrestrialized malacostracan crustaceans. The brain architecture of terrestrial isopods is fairly well understood and studies on this field suggest that the evolutionary transition from sea to land in isopods coincided with a considerable size reduction and functional loss of their first pair of antennae and associated brain areas. This finding suggests that terrestrial isopods may have no or poor abilities to detect volatile substances but that their chemosensory ecology is most likely restricted to contact chemoreception. In this study, we explored how the brain of a marine isopod and particularly its olfactory system compares to that of terrestrial relatives. Using histochemical and immunohistochemical labeling, brightfield and confocal laser-scan microscopy, we show that in the marine isopod Saduria entomon aesthetascs on the first pair of antennae provide input to a well defined deutocerebrum (DC). The deutocerebral chemosensory lobes (DCL) are divided into spherical neuropil compartments, the olfactory glomeruli (og). Secondary processing areas in the lateral protocerebrum (lPC) are supplied by a thin but distinct projection neuron tract (PNT) with a contralateral connection. Hence, contrary to terrestrial Isopoda, S. entomon has at least the neuronal substrate to perceive and process olfactory stimuli suggesting the originally marine isopod lineage had olfactory abilities comparable to that of other malacostracan crustaceans.

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Comparative anatomy of serotonin‐like immunoreactive neurons in isopods: Putative homologues in several species

Thompson

Zeidler

Bacon

1994

J of Comparative Neurology

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It is now commonly accepted that the arthropod nervous system has evolved only once, and so homologies between crustacean and insect nervous systems can be meaningfully sought. To do this, we have examined the distribution of serotonin (5-hydroxytryptamine)-like immunoreactive neurons in the central nervous system (CNS) of four common British isopods. Two species of terrestrial woodlouse, Oniscus asellus and Armadillidium vulgare, the littoral sea slater, Ligia oceanica, and the aquatic water hoglouse, Asellus meridianus, all possess approximately 40 pairs of serotonin-like immunoreactive neurons, distributed throughout the CNS in a very similar pattern. Interspecific homology is clearly suggested. Serotonin-like immunoreactive neurons in the first (T1) and fourth (T4) thoracic ganglia are particularly prominent in each of the four species studied. Whole-mount immunohistochemistry shows that the pair of T1 neurons have large dorsolateral cell bodies and prominent neurites that project medially and then anteriorly, whereas the pair of T4 neurons have ventrolateral cell bodies and neurites that bifurcate to form a thin axon projecting anteriorly to terminate in T3 and a thick medial axon that projects posteriorly into the abdominal neuromeres of the terminal ganglion. Intracellular cobalt staining of these neurons reveals more of their arborizations: the T1 neurons send three processes anteriorly, which arborize in the brain and exist from the CNS via peripheral nerves, whereas the T4 neurons contribute considerably to the extensive pattern of serotonin-like immunoreactive fibres in T3-T6 ganglia. The overall pattern of serotonin-like immunoreactive neurons in the isopods is similar to that in decapod crustacea, and a number of putative homologies can be assigned. It is more difficult to homologize the isopod serotonin-like immunoreactive neurons with those in the insect CNS, but some stained brain and thoracic neurons share common cell body positions and axon trajectories in isopods, decapods, and insects and may therefore be homologous.

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The central nervous system of Oniscus (isopoda)

Cited by 22 publications

References 15 publications

The Morphology and Structure of the Brain of Orconectes Virilis (Hagen) (Crustacea, Decapoda)

The Morphology and Structure of the Brain of Orconectes Virilis (Hagen) (Crustacea, Decapoda)

Brain anatomy of the marine isopod Saduria entomon Linnaeus, 1758 (Valvifera, Isopoda) with special emphasis on the olfactory pathway

Comparative anatomy of serotonin‐like immunoreactive neurons in isopods: Putative homologues in several species

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