Morphological Phylogeny of Alpheid Shrimps: Parallel Preadaptation and the Origin of a Key Morphological Innovation, the Snapping Claw

Anker, Arthur; Ahyong, Shane T.; Noël, Pierre; Palmer, A. Richard

doi:10.1554/05-486.1

Cited by 30 publications

(67 citation statements)

References 58 publications

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“…The larger major chela in males [27,28] is generally considered a sexually selected trait [32] because it mediates male-male competition for access to receptive females in caridean shrimps [33]. Therefore, we expected that larger major chela in females would also be selected for when competition among females is higher.…”

Section: Introductionmentioning

confidence: 99%

Reproductive skew drives patterns of sexual dimorphism in sponge-dwelling snapping shrimps

2015

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Sexual dimorphism is typically a result of strong sexual selection on male traits used in male-male competition and subsequent female choice. However, in social species where reproduction is monopolized by one or a few individuals in a group, selection on secondary sexual characteristics may be strong in both sexes. Indeed, sexual dimorphism is reduced in many cooperatively breeding vertebrates and eusocial insects with totipotent workers, presumably because of increased selection on female traits. Here, we examined the relationship between sexual dimorphism and sociality in eight species of Synalpheus snapping shrimps that vary in social structure and degree of reproductive skew. In species where reproduction was shared more equitably, most members of both sexes were physiologically capable of breeding. However, in species where reproduction was monopolized by a single individual, a large proportion of females-but not males-were reproductively inactive, suggesting stronger reproductive suppression and conflict among females. Moreover, as skew increased across species, proportional size of the major chela-the primary antagonistic weapon in snapping shrimps-increased among females and sexual dimorphism in major chela size declined. Thus, as reproductive skew increases among Synalpheus, female-female competition over reproduction appears to increase, resulting in decreased sexual dimorphism in weapon size.

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Section: Introductionmentioning

confidence: 99%

Reproductive skew drives patterns of sexual dimorphism in sponge-dwelling snapping shrimps

2015

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“…By combining extensive taxonomic sampling with appropriate comparative methods, it is possible to test for associations between specific characters and particular evolutionary patterns, and the implementation of such techniques has generated valuable information about how specific traits have directed the evolutionary trajectories of a diverse array of organisms (e.g. Bond and Opell 1998;Sears 2004;Anker et al 2006;Mabuchi et al 2007;Givnish et al 2008;Konow et al 2008). We employ such methods here in order to test anatomical predictions that follow from arguments for the presence of a developmental constraint on marsupial forelimb evolution.…”

Section: Introductionmentioning

confidence: 99%

Developmental constraint on the evolution of marsupial forelimb morphology

Cooper

Steppan

2010

Aust. J. Zool.

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Compared with the placental mammals, marsupials are born at an almost embryonic stage, but nearly all of these neonates immediately climb or crawl to one of their mother's teats using precociously developed forelimbs. Marsupial adults also exhibit limited forelimb shape diversity relative to the members of their sister group. That the functional requirements of this natal climb have imposed a developmental constraint on marsupial forelimb evolution represents a compelling and widely accepted hypothesis, yet its resulting predictions for the comparative patterns of mammal limb shape diversity have never been tested. In order to perform such tests we conducted extensive taxonomic sampling of mammal limb morphology (including fossil specimens), and then examined these data using morphometric methods, non-parametric analyses of anatomical disparity, and phylogenetic comparative analyses of evolutionary rates. Our results strongly support the constraint hypothesis, and indicate that the highly significant differences between marsupial and placental forelimb shape diversity has been strongly influenced by different rates of morphological evolution among the distal forelimb elements in these two important mammal lineages.

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“…The five recognized species of Athanopsis comprised the ingroup. Comprehensive phylogenetic analysis of the Alpheidae showed Pseudathanas Bruce, 1983 to be sister to Athanopsis (see Anker et al, 2006). Therefore, the analysis was rooted to the type species of Pseudathanas, P. darwiniensis Bruce, 1983.…”

Section: Methodsmentioning

confidence: 99%

A rediagnosis of Athanopsis australis Banner & Banner, 1982, a rare alpheid shrimp from southern Australia, with a phylogeny of Athanopsis Coutière, 1897 and remarks on antitropical distributions in the Alpheidae (Decapoda, Caridea)

Anker

Ahyong

2007

Crustac

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The rare alpheid shrimp, Athanopsis australis Banner & Banner, 1982, currently known from only four specimens from Victoria, Australia, is redescribed based on three specimens collected since the original description of the incomplete holotype. The major cheliped, missing in the holotype, is described for the first time; the minor cheliped, however, remains unknown. Contrary to the original description and illustrations, the telson of the holotype and of all recently collected specimens bears two pairs of small dorsal spines, as in all Athanopsis species. The apparent rarity of A. australis and other Athanopsis species may be due to their infaunal life style: at least two species live "commensally" in echiuran burrows. A preliminary phylogenetic analysis of Athanopsis based on morphological and colour pattern characters suggests that A. australis and A. dentipes Miya, 1980 from Japan are sister species with antitropical distribution. RÉSUMÉAthanopsis australis Banner & Banner, 1982, une espèce rare de crevette alphéide actuellement connue par seulement quatre spécimens provenant tous de Victoria (Australie), est redécrite sur la base de trois spécimens récoltés depuis la description originale de l'holotype incomplet. Le grand chélipède absent sur l'holotype est décrit pour la première fois; le petit chélipède cependant reste inconnu. Contrairement à la description et aux illustrations originales, le telson de l'holotype et de tous les spécimens récoltés récemment porte deux paires de courtes épines dorsales, comme chez toutes les espèces d'Athanopsis. L'apparente rareté de A. australis et des autres espèces d'Athanopsis est peut-être due à leur écologie: au moins deux espèces vivent de façon "commensale"

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Morphological Phylogeny of Alpheid Shrimps: Parallel Preadaptation and the Origin of a Key Morphological Innovation, the Snapping Claw

Cited by 30 publications

References 58 publications

Reproductive skew drives patterns of sexual dimorphism in sponge-dwelling snapping shrimps

Reproductive skew drives patterns of sexual dimorphism in sponge-dwelling snapping shrimps

Developmental constraint on the evolution of marsupial forelimb morphology

A rediagnosis of Athanopsis australis Banner & Banner, 1982, a rare alpheid shrimp from southern Australia, with a phylogeny of Athanopsis Coutière, 1897 and remarks on antitropical distributions in the Alpheidae (Decapoda, Caridea)

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