Macrophthalmus (Macrophthalmus) microfylacas, a new species of sentinel crab (Decapoda: Brachyura: Ocypodidae) from western Japan

Nagai, Takashi; Watanabe, Tetsuya; Naruse, Tohru

doi:10.11646/zootaxa.1171.1.1

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Recently two new species have been described (M. (Macrophthalmus) ryukyuanus Naruse & Kosuge, 2008; M. (Mareotis) pistrosinus Barnes & Davie, 2008) to make a total of 57 species. Mendoza & Ng (2007) discussed some of the complex aspects of these subgenera and provided a key to identify them (see also Komai et al, 1995;Nagai et al, 2006;Naruse & Kosuge, 2008;Davie, 2009;Barnes, 2010). In their study, Kitaura et al (2006) included 21 species, representing six subgenera from Japan, Vietnam and Australia.…”

Section: Introductionmentioning

confidence: 99%

Behavioural and molecular evidence for the systematic position of Macrophthalmus (Hemiplax) hirtipes Hombron & Jacquinot, 1846, with comments on macrophthalmine subgenera (Decapoda, Brachyura, Macrophthalmidae)

McLay¹,

Kitaura²,

Wãda³

2010

Studies on Malacostraca: Lipke Bijdeley Holthuis Memorial Volume

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The analysis of 16s rRNA data from the New Zealand sentinel crab, Macrophthalmus (Hemiplax) hirtipes (Jacquinot & Hombron, 1846) (Macrophthalminae: Macrophthalmidae) shows that it is the most basal species in the genus Macrophthalmus, and behavioural trait mapping suggests that ancestral behaviours included extended cheliped fighting. Other behaviour found in some sentinel crabs, such as allocleaning and waving displays, were absent in the ancestor and are regarded here as derived traits. It is proposed that the two subgenera Hemiplax and Tasmanoplax be elevated to full generic status. Three subgenera appear to be polyphyletic: Macrophthalmus (26 species), Mareotis (14 species) and Paramareotis (4 species), and to resolve this problem molecular data from the remaining species will need to be added into the analysis. The Australasian fauna contains the four most basal genera of the Macrophthalminae: Tasmanoplax, Hemiplax, Australoplax, and Enigmaplax. Our hypothesis is that these were early off-shoots from Tethyan ancestor(s) that colonized Australasia. RÉSUMÉ L'analyse des données d'ARNr 16S du crabe sentinelle venant de la néo-zélandais, Macrophthalmus (Hemiplax) hirtipes (Jacquinot et Hombron, 1846) (Macrophthalminae: Macrophthalmidae) montre que cette espèce est la plus basale du genre Macrophthalmus, et l'analyse des traits comportementaux suggère que le comportements de ses les ancêtres incluaient des combats avec les chélipédes déployés. D'autres comportements observés chez certains crabes sentinelles, tels que le nettoyage de conspécifiques ou l'agitation des chélipèdes, devaient être 3

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Section: Introductionmentioning

confidence: 99%

Behavioural and molecular evidence for the systematic position of Macrophthalmus (Hemiplax) hirtipes Hombron & Jacquinot, 1846, with comments on macrophthalmine subgenera (Decapoda, Brachyura, Macrophthalmidae)

McLay¹,

Kitaura²,

Wãda³

2010

Studies on Malacostraca: Lipke Bijdeley Holthuis Memorial Volume

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A New Species of Macrophthalmus (Crustacea: Decapoda: Brachyura: Macrophthalmidae) from Iriomote Island, Ryukyu Islands, Japan

Naruse

Kosuge²

2008

Spec.Div.

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A new species of the sentinel erab genus Macrophthalmus is described from Iriomote Island, southwestern Ryukyu Islands, ,]apan. imcrophthalmus tv.,ulp,uanus sp. nov. is ret'erred to the ML telescoptcus species group, within which it is morphologically most similar to M. rniUoti Crosnier, 1965, The forms of the eye, male chela, and fourth ambulatory leg clearly distinguish the new species from the latter. The new species is also compared to ML micrclliJlacas Nagai, Watanabe and Naruse, 2006 and M, iatipes Borradaile, 1903. A key to the Japanese species of the Ml telescopicus group is provided.

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[No Title Available]

Cuartas

Petriella

2010

Iheringia, Sér. Zool.

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ABSTRACT. Structure of the male reproductive tract of Uca uruguayensis (Decapoda, Ocypodidae). The structure of the male reproductive tract was described in Uca uruguayensis Nobili, 1901, by using histological methods, scanning electron microscopy techniques, and stereoscopic observations of fresh material. The aim of this work was to establish the functional changes associated with sexual maturation. The morphology of the first (G1) and second (G2) pair of gonopods was described. The male reproductive tract consists of paired organs: testes, and tubular and convoluted vas deferens (VD) ending with a terminal ampoule (TA).The (VD) is composed of three parts: anterior (AVD), medial (MVD) and posterior (PVD). The AVD and MVD are lined by a single layer of cubical cells. The PVD epithelial cells are columnar with elongated nuclei. The terminal ampoule comprises four interconnecting chambers and is externally surrounded by connective tissue. The study of testes and vas deferens at different times along the year suggests that U. uruguayensis has a single and continuous reproductive season from December to March. The TA has not been described in other brachyurans and this structure is novel to Brachyura. KEYWORDS.Male reproductive tract, functional morphology, Crustacea, Brachyura.RESUMEN. El objetivo de este trabajo es describir las estructuras del sistema reproductor de machos de Uca uruguayensis Nobili, 1901 y estudiar los cambios relacionados con la madurez sexual. Se trabajó con observación estereoscópica de material fresco, técnica histológica de rutina y observaciones en Microscopio Electrónico de Barrido. Se incluyó la caracterización de los gonopodos 1 (G1) y 2 (G2). El tracto reproductor del macho se compone de un par de testículos (T), un vaso deferente (VD) tubular y sinuoso y una ampolla terminal (AT). El VD tiene tres secciones, la anterior (VDA), la media (VDM) y la posterior (VDP). El VDA y VDM están conformadas por un epitelio simple de células cúbicas. El epitelio del VDP es columnar y con núcleos basales y alongados. El diseño tubular se modifica al ocuparse el lumen del VDP con líquido espermático durante el verano y la musculatura circular se hace más evidente. La porción terminal del VDP se ensancha formando una ampolla (AT) que comprende cuatro cámaras interconectadas. Todas las estructuras están rodeadas de una capa de tejido conectivo de poco espesor. Se identifican las modificaciones observadas en la histología de T y VD, definiendo como mas relevantes las observadas desde el mes de noviembre hasta marzo. Estas modificaciones sugieren que U. uruguayensis tiene, en la localidad estudiada, una única estación reproductiva durante el verano en esta latitud. La AT, tal como es descripta, es una estructura que hasta el momento no ha sido mencionada para los Brachyura. PALABRAS CLAVE.Tracto reproductor masculino, morfología funcional, Crustacea, Brachyura.

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Macrophthalmus (Macrophthalmus) microfylacas, a new species of sentinel crab (Decapoda: Brachyura: Ocypodidae) from western Japan

Cited by 5 publications

References 7 publications

Behavioural and molecular evidence for the systematic position of Macrophthalmus (Hemiplax) hirtipes Hombron & Jacquinot, 1846, with comments on macrophthalmine subgenera (Decapoda, Brachyura, Macrophthalmidae)

Behavioural and molecular evidence for the systematic position of Macrophthalmus (Hemiplax) hirtipes Hombron & Jacquinot, 1846, with comments on macrophthalmine subgenera (Decapoda, Brachyura, Macrophthalmidae)

A New Species of Macrophthalmus (Crustacea: Decapoda: Brachyura: Macrophthalmidae) from Iriomote Island, Ryukyu Islands, Japan

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