The spider Micrathena shealsi Chickering, 1960 (Araneae, Araneidae): description of the male, with new data on its geographic distribution

Argañaraz, Carina I.; Rubio, Gonzalo

doi:10.11646/zootaxa.3104.1.4

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…The taxonomy of the two genera is well resolved because of exhaustive revisions made by Levi (1978, 1985). Since these, the systematics of the two genera has changed little (reviewed by Argañaraz & Rubio, 2011; Magalhães & Santos, 2011).…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic analysis of Micrathena and Chaetacis spiders (Araneae: Araneidae) reveals multiple origins of extreme sexual size dimorphism and long abdominal spines

Magalhães¹,

Santos²

2012

Zoological Journal of the Linnean Society

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The phylogenetic relationships amongst the New World spiny orb-weaving spiders Micrathena and Chaetacis were assessed through parsimony and Bayesian analyses of morphological characters. A total of 146 characters was scored for ten outgroup taxa and 37 Micrathena and four Chaetacis species. The results indicate that Chaetacis nests within Micrathena and we propose Chaetacis as a junior synonym of Micrathena. Twelve subgeneric species groups of Micrathena are recognized and diagnosed. Species with extremely long spines evolved at least eight times in the genus and we suggest that this may be related to antipredator defences. Micrathena is primitively sexually monomorphic and extreme sexual size dimorphism has arisen at least six times in the genus. Most of these events are because of enlargement of the female in relation to the ancestral size, although in two cases sexual dimorphism was attained through male reduction, adding more data to the 'giant females' vs. 'dwarf males' controversy. The genus is probably of South American origin and has repeatedly invaded Central and North America.

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Section: Introductionmentioning

confidence: 99%

Phylogenetic analysis of Micrathena and Chaetacis spiders (Araneae: Araneidae) reveals multiple origins of extreme sexual size dimorphism and long abdominal spines

Magalhães¹,

Santos²

2012

Zoological Journal of the Linnean Society

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“…Morphological terms and format of description follow in general Levi (1991) and Argañaraz & Rubio (2011). Female genitalia were examined after digestion in a hot 10-20% KOH solution.…”

Section: Methodsmentioning

confidence: 99%

A new orb-weaving spider from the Argentinean flooding pampas grasses: Aculepeira morenoae new species (Araneae, Araneidae)

Rubio

Izquierdo

Piacentini

2013

Zootaxa

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“…Regarding the other two extrinsic shortfalls (sensu Hortal et al., 2015), not knowing some semaphoronts may hinder the analysis of geographical distribution and abundance of species, particularly in cases where the taxonomy of the group and/or ecological data are based on a single or few semaphoronts. When new semaphoronts become available, the delimitation of the distribution of a given taxon can be done much more accurately (e.g., Argañaraz & Rubio, 2011; Magalhães et al., 2017), so that the Wallacean shortfall can be more properly addressed. A very pertinent example of such gain, especially when thinking about groups for which studies are traditionally based on a single semaphoront, can be found in Cranston and Tang’s (2018:41) statement about the distribution of Skusella subvittata (Skuse, 1889) (Diptera, Chironomidae): “a wider distribution of S. subvittata in Australia and Asia is revealed by extensive pupal exuviae sampled from drift.”…”

Section: Interconnections Between the Haeckelian And The Other Shortfmentioning

confidence: 99%

The Haeckelian shortfall or the tale of the missing semaphoronts

Faria

Pie

Salles

et al. 2020

J. Zool. Syst. Evol. Res.

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When faced with the daunting and exciting task of studying biodiversity, one must necessarily come to terms with a few challenging knowledge gaps, the so‐called biodiversity shortfalls. Given that biodiversity is inherently multidimensional, it seems rather natural to admit that hitherto unrecognized shortfalls, on other distinct aspects of biodiversity, should be considered. Here, we introduce the Haeckelian shortfall, which has as its nexus organismal ontogeny, and refers to the relative scarcity of knowledge about the distinct semaphoronts of a substantial fraction of all known species. The Haeckelian shortfall has a profound relevance on the matter of total evidence, in the context of systematics, besides several indirect effects on the other shortfalls, as they all are intimately interconnected. The importance of studying distinct semaphoronts is crystal clear: Besides the purest and most descriptive access to the ontogeny of species (the idiographic aspect), assessing those semaphoronts will certainly promote the advancement of relevant nomothetic knowledge, contributing to an increasingly meaningful eco–evo–devo. Overcoming the Haeckelian shortfall is certainly a major challenge in our task of knowing and preserving biodiversity.

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The spider Micrathena shealsi Chickering, 1960 (Araneae, Araneidae): description of the male, with new data on its geographic distribution

Cited by 4 publications

References 7 publications

Phylogenetic analysis of Micrathena and Chaetacis spiders (Araneae: Araneidae) reveals multiple origins of extreme sexual size dimorphism and long abdominal spines

Phylogenetic analysis of Micrathena and Chaetacis spiders (Araneae: Araneidae) reveals multiple origins of extreme sexual size dimorphism and long abdominal spines

A new orb-weaving spider from the Argentinean flooding pampas grasses: Aculepeira morenoae new species (Araneae, Araneidae)

The Haeckelian shortfall or the tale of the missing semaphoronts

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