Studien über das Gehörorgan der Decapoden /

Hensen, V.

doi:10.5962/bhl.title.53707

Cited by 10 publications

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“….2) thread ~oth types ]~I again not Fig. There is some doubt as to whether the latter are sensory at all (HENSEN, 1863;PRENTISS, 1900;DIJKGRAAF, 1955DIJKGRAAF, , 1956a. The right statocyst and its nervous connection to the supra.esophageal ganglion in Homaru8 americanu8 seen in dorsal view.…”

Section: Decapodamentioning

confidence: 97%

The Perception of Gravity and of Angular Acceleration in Invertebrates

Markl¹

1974

Handbook of Sensory Physiology

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Section: Decapodamentioning

confidence: 97%

The Perception of Gravity and of Angular Acceleration in Invertebrates

Markl¹

1974

Handbook of Sensory Physiology

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“…The structure of the statocyst Based on light microscopy studies the general structure, shape, and position of the statocyst of N. integer resembles that of Praunus flexuosus (Hensen, 1863;Bethe, 1895;Debaisieux, '49). Two differences do exist: the adults of N. integer have about 35 sensilla, whereas Debaisieux ('49) reported about 65 sensilla in Praunus flexuosus.…”

Section: Discussionmentioning

confidence: 99%

“…Although these gravity-receptive organs drew the attention of zoologists more than a century ago (Hensen, 1863) and despite their presence in diverse forms in several taxa (Bullock and Horridge,'65), at the moment only the fine structure of the statocyst sensilla of Astacus fluviatilis is known (Schone and Steinbrecht,'68). Recently, Rose and Stokes ('81) provided some ultrastructural data on the statocyst of Cyathura polita.…”

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Fine structure of the statocyst sensilla of the mysid shrimp Neomysis integer (Leach, 1814) (Crustacea, Mysidacea)

Espeel¹

1985

Journal of Morphology

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The fine structure of the statocyst sensilla of Neomysis integer was investigated. The statocyst contains about 35 sensilla, which are composed of two bipolar sensory cells, nine enveloping cells, and a seta. The sensory cells consist of an axon, a perikaryon, and a dendrite. The dendrite contains a proximal segment with a ciliary rootlet and at least one basal body, and a distal segment with a ciliary axoneme (9 × 2 + 0) at its base. The distal segment extends along the peripheral wall of the seta and is in close contact with the wall of the hair shaft. The enveloping cells surround the proximal and distal segments of the dendrite. The innermost enveloping cell contains a scolopale rod. It surrounds the receptor lymph cavity and secretes flocculent material into this cavity. From the tip of the cell a dendritic sheath, which encloses the distal segment of the dendrite, emerges. A peculiar feature of the second enveloping cell is the presence of a scolopale-like rod, which is more slender and less pronounced than in the first enveloping cell. The seta consists of three parts: a socket, a tubular midpart, and a gutter-like apical part, the tip of which penetrates into the statolith. The seta shows over its full length a bilaterally symmetrical axis that is coplanar with the plane in which the seta is bent toward the statolith. The structure of the seta and the position of the distal segments provide morphological evidence for directional sensitivity of the sensilla and for the magnitude of shear on the setal wall being an adequate stimulus.

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“…They distinguished an early stage with the appearance of an organic matrix, a nucleation stage with the formation of a calcified central core, and a final stage of rapid mineralization in the outer parts of the matrix. Hensen (1863) identified the inorganic component of statoliths as CaF2. For about 100 years, this finding was extrapolated to all mysids with few efforts for control.…”

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Structure of recent and fossil mysid statoliths (Crustacea, Mysidacea)

Wittmann¹,

Schlacher²,

Ariani

1993

Journal of Morphology

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Statoliths of 61 Recent species representing all subfamilies of Mysidae were studied with special emphasis on internal structure. In addition 5 samples of fossil statoliths from Miocene deposits were examined. Species of Boreomysinae and Rhopalophthalminae show simple roughly spherical organic statoliths, with setae originating from the sensory cushion and anchored in the statolith with distal branches extending shortly below the surface. All other subfamilies possess mineralized statoliths of greater structural complexity, with differentiation in core and mantle, where each part may consist of up to three layers. Habitus is hemispherical to discoidal. External gross structures are dorsal tegmen, ventral fundus, and the ambitus forming the outer toroidal to semi-toroidal circumference. Setae penetrate the mantle through mineralic canals and insert on the surface of the core. As suggested by congeneric species of Schistomysis, there is no principal structural difference between statoliths mineralized with fluorite compared to vaterite. However, vaterite statoliths tend to be more often of moruloid appearance and are exceptional by showing a central conical hole (the hilum) or a central cavity in certain forms. These structures are typical of fossil calcite statoliths. In vaterite and fluorite statoliths, the mantle shows radially arranged (= spherulitic) crystal aggregates. Such arrangements are badly preserved in fossil calcite statoliths. In large extant statoliths, concentric structures, mainly in the form of superficial striation and/or concentric microstrata, are visible in coexistence with radial aggregates. Stratification is possibly due to stratified deposition of the nonmineralized gland product, while the spherulitic structure is indicative of subsequent radial growth of crystal aggregates. The structure of accessory fluorite statoliths in the statocyst of Mesopodopsis slabberi leads to the hypothesis that mantle material is formed by secretions of the caudal statocyst gland. After demineralization of fluorite, vaterite and calcite statoliths, an organic template remains showing most essential morphological features of the statolith. From this we conclude that the structure of the statolith is (almost) entirely matrix mediated. © 1993 Wiley-Liss, Inc.

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Studien über das Gehörorgan der Decapoden /

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Cited by 10 publications

References 0 publications

The Perception of Gravity and of Angular Acceleration in Invertebrates

The Perception of Gravity and of Angular Acceleration in Invertebrates

Fine structure of the statocyst sensilla of the mysid shrimp Neomysis integer (Leach, 1814) (Crustacea, Mysidacea)

Structure of recent and fossil mysid statoliths (Crustacea, Mysidacea)

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