Hermit Crab Phylogeny: A Reappraisal and Its “Fall-Out”

McLaughlin, Patsy A.; Lemaitre, Rafael; Sörhannus, Ulf

doi:10.1651/s-2675.1

Cited by 97 publications

(92 citation statements)

References 77 publications

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“…The family Diogenidae consists of 20 genera (McLaughlin et al 2007(McLaughlin et al , 2010, and to date most of the species have not had their male reproductive aspects studied. In connection with the genus Clibanarius (see references in the 'Discussion'), the male reproductive systems of only 6 genera have been described in detail: Calcinus (Tirelli et al Clibanarius sclopetarius (Herbst, 1796) is an intertidal hermit crab that lives on sand, mudflats and rocky substrates of beaches and mangroves, from shallow waters to a depth of 50 m in tropical and subtropical areas.…”

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confidence: 99%

Reproductive system of the male hermit crab Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Santos¹,

Mantelatto

2011

Aquat. Biol.

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In the present study, the morphology and biometry of the spermatophores of the western Atlantic hermit crab Clibanarius sclopetarius (Herbst, 1796) are described, and the results are placed in the context of the Paguroidea, in particular the Diogenidae. Individuals of C. sclopetarius were sampled from a human-impacted mangrove area of southern Brazil. The male reproductive system was removed, measured and analyzed using stereoscopic, light, transmission-electron and scanning-electron microscopy. This system is composed of lobular testes connected to the vas deferens, and gonopores with membranous coverage. The mature spermatophore consists of a spherical pack that stores sperm. These cells consist of a spherical acrosomal vesicle, an amorphous cytoplasm and a distal nucleus. The results revealed that the gonopores, testis and vas deferens have the expected characteristics of the family Diogenidae, while the non-tripartite morphology of the spermatophores and the sperm follow the patterns found only in the genus Clibanarius, and the presence of the dense perforatorial ring is, to date, unique in the species of the genus, being a possible apomorphic characteristic.KEY WORDS: Diogenidae · Reproduction · Spermatophores · Sperm · Spermiotaxonomy Resale or republication not permitted without written consent of the publisherAquat Biol 12: [271][272][273][274][275][276][277][278][279][280] 2011 and a variable number of arms. Among the Anomura, the acrosomal vesicle can be oblong (Jamieson 1991) or spherical (Tudge 1992, Tudge & Scheltinga 2002 in shape and is covered by a spherical or conical operculum. Moreover, the anterior region of the cytoplasm or of the nucleus bears 3 arms that contain microtubules (Jamieson 1991).The association of the sperm characteristics with other reproductive components (testes, vasa deferentia, and spermatophores) is important to better understand the process of fertilization (Sastry 1983, Uma & Subramoniam 1984, Amadio & Mantelatto 2009). In addition, the great diversity found in the morphologies of the sperm and of the spermatophore, with characteristics that are particular to members of different groups, make these structures taxonomically specific (Tudge 1991, Subramoniam 1993; thus, together with other taxonomic criteria, they can also be used to elucidate taxonomic and phylogenetic questions (Scelzo et al. 2004, Mantelatto et al. 2009, Tudge 2009).In the superfamily Paguroidea, which contains the hermit crabs, the spermatophores are complex and tripartite structures, consisting of an ampulla, a stalk, and a pedestal (Tudge 1991, Krol et al. 1992, Subramoniam 1993, Scelzo et al. 2004, Tirelli et al. 2007, Mantelatto et al. 2009). Tripartite spermatophores with a small and spherical ampulla and a long and thin stalk have been de scribed only for diogenid members (Tudge 1991), but exceptions in this division have been observed in some species of the genus Clibanarius, where the stalk and the pedestal are absent (Uma & Subramoniam 1984, Hess & Bauer 2002.The family Diogenid...

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Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Reproductive system of the male hermit crab Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Santos¹,

Mantelatto

2011

Aquat. Biol.

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“…On the other hand, there have also been noteworthy studies refuting the relationship between the king and hermit crabs. Martin and Abele (1986) first tentatively suggested that the close relationship proposed might not be correct (McLaughlin et al, 2007). In 1997, McLaughlin and Lemaitre strongly opposed the traditional view of lithodid crabs being descendant from hermit predecessors through carcinization based on their study on adult morphology.…”

Section: Introductionmentioning

confidence: 99%

“…In 1997, McLaughlin and Lemaitre strongly opposed the traditional view of lithodid crabs being descendant from hermit predecessors through carcinization based on their study on adult morphology. They even suggested an alternative hypothesis; that in fact the reverse had occurred, and that hermit crabs had evolved from the crab-like lithodid form (McLaughlin et al, 2004(McLaughlin et al, , 2007.…”

Section: Introductionmentioning

confidence: 99%

Behavioural and respiratory response of the shallow-water hermit crab Pagurus cuanensis to hydrostatic pressure and temperature

Thatje

Casburn

Calcagno

2010

Journal of Experimental Marine Biology and Ecology

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The evolutionary history of the Anomura has long been controversially discussed. One aspect that has received little attention is the dissimilarity in physiological tolerances of the related families Paguridae and Lithodidae to environmental conditions, and how this may have determined the divergence and radiation of the families into different distribution ranges, in particular with regard to the limited penetration of the deep sea by the Paguridae. This study investigates the physiological tolerances of the temperate shallow-water hermit crab, Pagurus cuanensis, to various temperature (5, 10, 15, 20°C) and pressure regimes (1 to 100 atm) by measuring the standard metabolic rate (SMR) and behavioural changes. SMR was primarily affected by temperature, with a notably low rate at 5°C throughout all pressures. Behaviour was affected by pressure, with an increase in pressure from 50 to 100 atmospheres (atm) resulting in reduced activity. It is suggested that this species can tolerate hydrostatic pressures greater than those found in its natural bathymetric range. It is discussed that a lack of physiological cold tolerance and ecological factors, such as the need to find gastropod shells for protection, are the principal restrictions maintaining P. cuanensis to a maximum depth of approximately 250 m. We hypothesize that temperate shallow-water invertebrates could indeed be able to penetrate greater depths as continental shelf waters warm up in the course of global climate change.

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“…The uniqueness of some of its morphological characters and its distinctive phylogenetic position (Pérez-Losada et al, 2002) led to the reclassification of Aeglidae in a separate super-family, Aegloidea (McLaughlin et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

New species and records of the genus Aegla Leach, 1820 (Crustacea, Anomura, Aeglidae) from the West-Central region of Rio Grande do Sul, Brazil

et al. 2013

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-Aeglidae are anomuran freshwater "crabs" found only in southern South America. In Brazil, the greatest species diversity occurs in hydrographic basins of the state of Rio Grande do Sul. Two new species, Aegla georginae and Aegla ludwigi, are described from the Ibicuí and Ijuí Rivers, respectively (Uruguay River Basin). The new taxa can be distinguished from other Aegla species based on both morphological and molecular characters. The two new species have a very restricted distribution and are categorized as endangered (A. georginae) and critically endangered (A. ludwigi) using IUCN Red List criteria. We also summarize and present new records of the Aegla species occurring in the Uruguay River Basin.

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Hermit Crab Phylogeny: A Reappraisal and Its “Fall-Out”

Cited by 97 publications

References 77 publications

Reproductive system of the male hermit crab Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Reproductive system of the male hermit crab Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Behavioural and respiratory response of the shallow-water hermit crab Pagurus cuanensis to hydrostatic pressure and temperature

New species and records of the genus Aegla Leach, 1820 (Crustacea, Anomura, Aeglidae) from the West-Central region of Rio Grande do Sul, Brazil

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Hermit Crab Phylogeny: A Reappraisal and Its “Fall-Out”

Cited by 97 publications

References 77 publications

Reproductive system of the male hermit crab ­Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Reproductive system of the male hermit crab ­Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Behavioural and respiratory response of the shallow-water hermit crab Pagurus cuanensis to hydrostatic pressure and temperature

New species and records of the genus Aegla Leach, 1820 (Crustacea, Anomura, Aeglidae) from the West-Central region of Rio Grande do Sul, Brazil

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Reproductive system of the male hermit crab Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies

Reproductive system of the male hermit crab Clibanarius sclopetarius: gonopore, spermatophore, and spermatozoal morphologies