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  1. Article: Morphological changes during ontogeny of the male first and second gonopods of Mithraculus forceps A. Milne-Edwards, 1875 (Brachyura: Majoidea: Mithracidae)

    Mollemberg, Michelle / Lianos, Laira / Zara, Fernando José / Swenson, Rafael / Cobo, Valter José / Santana, William

    Journal of natural history. 2021 Apr. 18, v. 55, no. 15-16

    2021  

    Abstract: In brachyuran crabs, the complexity of the copulatory system provides important information about the systematics of the group. Here we used scanning electron microscopy and light microscopy to provide information about the morphological changes during ... ...

    Abstract In brachyuran crabs, the complexity of the copulatory system provides important information about the systematics of the group. Here we used scanning electron microscopy and light microscopy to provide information about the morphological changes during the gonopods ontogeny in the spider crab Mithraculus forceps. For this, a series of specimens were analysed and grouped in size classes of cephalothorax width (CW). The smaller males (first and second size classes) presented the first gonopod without a formed ejaculatory aperture and with an indistinct apical plate. The ejaculatory canal aperture is fully formed in size class 5 with 8.8 to 9.9 mm (CW). In adult males, the apical plate is divided in two lobes: a rounded mesial lobe and a distinct tapering lateral lobe with a large ejaculatory canal aperture. Throughout growth, there was an increment in number and/or size of the secondary cuticle structures, such as setae, spines, and sensilla. Morphological changes in the second gonopod are not abrupt during the ontogenetic development, with the girdle in the apical region and the median process becoming more prominent and tapered. Although to clearly determine the sexual maturity, information on the gonadal development (physiological sexual maturation) is needed, we observed that the gonopods morphology could provide important information to determine the sexual maturation. In our analyses, the morphological maturity occurred in line with the physiological maturity, both diagnosed in the size class 5.
    Keywords Majidae ; adults ; cephalothorax ; gonads ; light microscopy ; males ; natural history ; ontogeny ; sensilla ; sexual maturity
    Language English
    Dates of publication 2021-0418
    Size p. 953-967.
    Publishing place Taylor & Francis
    Document type Article
    ZDB-ID 1467695-3
    ISSN 1464-5262 ; 0022-2933
    ISSN (online) 1464-5262
    ISSN 0022-2933
    DOI 10.1080/00222933.2021.1927229
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Much more than hooked: Setal adaptations for camouflage in Macrocoeloma trispinosum (Latreille, 1825) (Crustacea: Decapoda: Brachyura)

    Lianos, Laira / Mollemberg, Michelle / Colavite, Jessica / Lopes e Silva, Amanda / Zara, Fernando José / Santana, William

    Arthropod structure & development. 2022 Jan., v. 66

    2022  

    Abstract: Several majoid crabs are known to adhere exogenous materials to their bodies, a behaviour called decoration. Until now, the adhesion of exogenous materials to the body is most attributed to the well-known hooked setae. Here, we analysed the carapace of ... ...

    Abstract Several majoid crabs are known to adhere exogenous materials to their bodies, a behaviour called decoration. Until now, the adhesion of exogenous materials to the body is most attributed to the well-known hooked setae. Here, we analysed the carapace of Macrocoeloma trispinosum (Latreille, 1825) under light and electron microscopy to study the different mechanisms allowing majoid crabs to decorate themselves. Five setal types are described here, of which four for the first time: velvet type I, velvet type II, depressa and cattail seta. These setae are morphologically and histologically detailed, and new hypotheses about the fixation of exogenous material on the carapace are explored. M. trispinosum has a complex setal apparatus for the adhesion of the decoration, with tegumental ducts along the shaft of most setae. These tegumental ducts are connected to glands formed by large cells arranged radially (rosette or acini) at the base of the setae, in the connective tissue, just below the epithelium. We could observe these glands in different stages of maturation, and no valve-like structure was observed, which may indicate a continuous flow of protein secretion that could serve as an adhesive substance found in the apex of most setae. This is the first record indicating a potential chemical adhesion mechanism aiding the masking process in decorator crabs.
    Keywords Decapoda ; adhesion ; arthropods ; camouflage ; electron microscopy ; epithelium ; protein secretion
    Language English
    Dates of publication 2022-01
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2001498-3
    ISSN 1873-5495 ; 1467-8039
    ISSN (online) 1873-5495
    ISSN 1467-8039
    DOI 10.1016/j.asd.2021.101132
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  3. Article: Morphology and ultrastructure of the adult ovarian cycle in Mithracidae (Crustacea, Decapoda, Brachyura, Majoidea)

    Mollemberg, Michelle / Fernando José Zara / William Santana

    Helgoland marine research. 2017 Dec., v. 71, no. 1

    2017  

    Abstract: The ultrastructure of the ovary during development and yolk production is poorly known in Brachyura and Majoidea in particular. Here, we describe the histology, histochemistry and ultrastructure of the adult ovarian cycle in four Mithracidae species from ...

    Abstract The ultrastructure of the ovary during development and yolk production is poorly known in Brachyura and Majoidea in particular. Here, we describe the histology, histochemistry and ultrastructure of the adult ovarian cycle in four Mithracidae species from three different genera: Mithrax hispidus, Mithrax tortugae, Mithraculus forceps and Omalacantha bicornuta. All species showed a similar pattern of ovarian development and vitellogenesis. Macroscopically, we detected three stages of ovarian development: rudimentary (RUD), developing (DE) and mature (MAT); however, in histological and ultrastructural analyses, we identified four stages of development. The oocytes of the RUD stage, during endogenous vitellogenesis, have basophilic cytoplasm filled with dilated rough endoplasmic reticulum. The reticulum lumen showed many granular to electron-dense materials among the different stages of development. The Golgi complexes were only observed in the RUD stage and are responsible for releasing vesicles that merge to the endogenous or immature yolk vesicles. At the early DE stage, the oolemma showed many coated and endocytic vesicles at the cortex. The endocytic vesicles merge with the endogenous yolk to form the exogenous or mature yolk vesicles, always surrounded by a membrane, characterizing exogenous vitellogenesis. The exogenous yolk vesicles comprise glycoproteins, showing only neutral polysaccharides. At the late DE stage, endocytosis still occurs, but the amount of endogenous yolk decreases while the exogenous yolk increases. The late DE stage is characterized by the beginning of chorion production among the microvilli. The MAT stage is similar to the late DE, but the endogenous yolk is restricted to a few cytoplasmic areas, the ooplasma is filled with exogenous yolk, and the oolemma has very few coated vesicles. In the MAT stage, the chorion is fully formed and shows two electron-dense layers. The ovarian development of the species studied has many similarities with the very little known Majoidea in terms of the composition, arrangement and increment of the yolk vesicles during oocyte maturation. The main differences are in the vitellogenesis process, where immature yolk formation occurs without the direct participation of the mitochondria but with the participation of the rough endoplasmic reticulum in the endogenous phase.
    Keywords Decapoda ; adults ; chorion ; coated vesicles ; cortex ; endocytosis ; glycoproteins ; histochemistry ; microvilli ; mitochondria ; oocytes ; ovarian development ; polysaccharides ; reticulum ; rough endoplasmic reticulum ; ultrastructure ; vitellogenesis
    Language English
    Dates of publication 2017-12
    Size p. 14.
    Publishing place BioMed Central
    Document type Article
    ZDB-ID 1495261-0
    ISSN 1438-3888 ; 1438-387X
    ISSN (online) 1438-3888
    ISSN 1438-387X
    DOI 10.1186/s10152-017-0494-y
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  4. Article ; Online: Much more than hooked: Setal adaptations for camouflage in Macrocoeloma trispinosum (Latreille, 1825) (Crustacea: Decapoda: Brachyura).

    Lianos, Laira / Mollemberg, Michelle / Colavite, Jessica / Lopes E Silva, Amanda / Zara, Fernando José / Santana, William

    Arthropod structure & development

    2021  Volume 66, Page(s) 101132

    Abstract: Several majoid crabs are known to adhere exogenous materials to their bodies, a behaviour called decoration. Until now, the adhesion of exogenous materials to the body is most attributed to the well-known hooked setae. Here, we analysed the carapace of ... ...

    Abstract Several majoid crabs are known to adhere exogenous materials to their bodies, a behaviour called decoration. Until now, the adhesion of exogenous materials to the body is most attributed to the well-known hooked setae. Here, we analysed the carapace of Macrocoeloma trispinosum (Latreille, 1825) under light and electron microscopy to study the different mechanisms allowing majoid crabs to decorate themselves. Five setal types are described here, of which four for the first time: velvet type I, velvet type II, depressa and cattail seta. These setae are morphologically and histologically detailed, and new hypotheses about the fixation of exogenous material on the carapace are explored. M. trispinosum has a complex setal apparatus for the adhesion of the decoration, with tegumental ducts along the shaft of most setae. These tegumental ducts are connected to glands formed by large cells arranged radially (rosette or acini) at the base of the setae, in the connective tissue, just below the epithelium. We could observe these glands in different stages of maturation, and no valve-like structure was observed, which may indicate a continuous flow of protein secretion that could serve as an adhesive substance found in the apex of most setae. This is the first record indicating a potential chemical adhesion mechanism aiding the masking process in decorator crabs.
    MeSH term(s) Animal Shells ; Animals ; Brachyura/anatomy & histology ; Sensilla
    Language English
    Publishing date 2021-12-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2001498-3
    ISSN 1873-5495 ; 1467-8039
    ISSN (online) 1873-5495
    ISSN 1467-8039
    DOI 10.1016/j.asd.2021.101132
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: ESR dating of Smilodon populator from Toca de Cima dos Pilão, Piauí, Brazil.

    Kinoshita, Angela / Mollemberg, Michelle / Santana, William / G Figueiredo, Ana Maria / Guidon, Niede / Fátima da Luz, Maria de / Guérin, Claude / Baffa, Oswaldo

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2016  Volume 120, Page(s) 66–70

    Abstract: Smilodon is a genus of big cats that lived from the early to the late Pleistocene in regions extending from North to South America. The fossil records of the "saber-toothed cats" are uneven, with some taxa being quite abundant in certain regions. In ... ...

    Abstract Smilodon is a genus of big cats that lived from the early to the late Pleistocene in regions extending from North to South America. The fossil records of the "saber-toothed cats" are uneven, with some taxa being quite abundant in certain regions. In Brazil, Smilodon populator is a well-known species whose remains, although scarce in comparison to other large mammals, are found all across the country. In particular, there are multiple records of this species in the region of the Serra da Capivara National Park. This area was home to a rich Pleistocene-Holocene fauna, including many mammals. Here, we report on the Electron Spin Resonance dating of a Smilodon populator tooth found in "Toca de Cima dos Pilão", located in the surroundings of the Serra da Capivara National Park. The equivalent dose found after exponential fitting of dose-response curve was (2.7±0.3)x10
    MeSH term(s) Animals ; Brazil ; Electron Spin Resonance Spectroscopy/methods ; Felidae/anatomy & histology ; Fossils/anatomy & histology ; History, Ancient ; Paleodontology/methods ; Radiometric Dating/methods ; Tooth/anatomy & histology
    Language English
    Publishing date 2016-11-22
    Publishing country England
    Document type Historical Article ; Journal Article
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2016.11.016
    Database MEDical Literature Analysis and Retrieval System OnLINE

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