Dataset Information

The male of Megacormusgranosus (Gervais, 1844) with comments on its hemispermatophore (Scorpiones, Euscorpiidae).

ABSTRACT: The male of Megacormusgranosus is described for the first time and the female redescribed. A homology scheme proposed recently is applied to hemispermatophore structures. The specimens were collected in an oak forest from Pico de Orizaba Volcano at an average altitude of 2340 m. All adult males were collected by pitfall traps, whereas all adult females and both sex immatures were collected using Berlese funnels, suggesting that males are comparatively more mobile within the leaf litter layer, probably due to mating season.

SUBMITTER: Gonzalez-Santillan E

PROVIDER: S-EPMC4443526 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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The male of Megacormusgranosus (Gervais, 1844) with comments on its hemispermatophore (Scorpiones, Euscorpiidae).

González-Santillán Edmundo E Alvarez-Padilla Fernando F

ZooKeys 20150518 504

The male of Megacormusgranosus is described for the first time and the female redescribed. A homology scheme proposed recently is applied to hemispermatophore structures. The specimens were collected in an oak forest from Pico de Orizaba Volcano at an average altitude of 2340 m. All adult males were collected by pitfall traps, whereas all adult females and both sex immatures were collected using Berlese funnels, suggesting that males are comparatively more mobile within the leaf litter layer, pr ...[more]

PMID: 26019677

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Project description:Background:Insemination in scorpions is carried out by means of a partly sclerotized structure, the spermatophore, which is composed of two separate halves, the hemispermatophores. In most genera these reproductive structures can be used to differentiate species. However, many taxa such as the genus Euscorpius and the family Diplocentridae lack the morphological diversity observed in the copulatory organs of many other arthropods, rendering them useless for species level taxonomy. Such structural stasis, however, suggests that hemispermatophores have evolved relatively slowly and may thus provide a stronger phylogenetic signal for recognizing supra-generic ranks than previously thought. Based on the postulate that the phenotypic stability observed in some groups is the consequence of functional constraint, the most comprehensive comparative study of the male sexual apparatus to date was conducted for a complete reassessment of the morphology, phylogenetic value and hypotheses of homology of these structures. Results:Hemispermatophores, pre- and post-insemination spermatophores, as well as the inherent mechanisms of insemination, were studied across the whole order, allowing the recognition and description of a series of five basic bauplans for the capsular region. For the most part, these patterns appear to be consistent within each major taxonomic group, but several cases of incongruence between spermatophore morphology and taxonomy raises questions about the monophyly of some clades. The Bothriuridae are traditionally regarded as a basal scorpionoid family. However, except for the genus Lisposoma, bothriurid hemispermatophores and spermatophores are morphologically more similar to those of the Chactoidea than to those of scorpionoids. On the other hand, the male copulatory structures of the hormurid clade (Hormiops (Hormurus + Liocheles)) are more akin to those of Diplocentridae and Heteroscorpionidae than to those of other hormurids. Conclusions:Spermatophore capsular patterns appears to be congruent with a recent phylogeny of the order Scorpiones based on phylogenomic data that placed Bothriuridae outside of Scorpionoidea and Liocheles outside of Hormuridae, in contradicton with earlier phylogenetic reconstructions based on morphology. This raises questions about the potential use of functionally constrained traits to assess the reliability of contradicting phylogenetic hypotheses and emphasizes the need for a thorough reassessment of the scorpion phylogenetic relationships.

Dataset Information

The male of Megacormusgranosus (Gervais, 1844) with comments on its hemispermatophore (Scorpiones, Euscorpiidae).

Publications

The male of Megacormusgranosus (Gervais, 1844) with comments on its hemispermatophore (Scorpiones, Euscorpiidae).

Similar Datasets

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