Evolution of the nauplius stage in malacostracan crustaceans

By Gerhard Scholtz. 2000

111 citations recorded by the source corpus.

This article gives an overview on some aspects of malacostracan development at the levels of gene expression, cell division, and shape of embryos and larvae. The various modes of development found in malacostracans are discussed in a phylogenetic and an evolutionary framework. It is suggested that the plesiomorphic condition within the Malacostraca is an embryonized egg-nauplius which is characterised by a yolky egg, precocious development of the three anteriormost head segments, an antero-ventrally folded caudal papilla, and a growth zone formed by rings of 19 ecto- and eight mesoteloblasts. Several alterations of this malacostracan ground pattern occurred concerning the arrangement and the number of teloblasts, the shape of the embryo and the timing of segmentation with respect to the naupliar segments. From their distribution within the phylogenetic tree and from their larval characteristics it is concluded that the free-living nauplius larvae of euphausiids and dendrobranchiate decapods are secondarily evolved from ontogenies without a free-living nauplius. Because the nauplius stage is lost in several malacostracan taxa, the concept of the nauplius as a phylotypic stage of crustaceans is refuted. In addition, the nauplius as an example of the recapitulation of ancestral characters is discussed.

Subfields: Ecology, Environmental Chemistry, Oceanography

View Paper: https://www.semanticscholar.org/paper/30d9e44d2d732792e335715a621121d392523264

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Ecology

In Environmental Chemistry

In Oceanography

Citations in the corpus

Contributions of larval biology to crustacean research: a review (2006, background): “Among the Crustacea, the most primitive, most wide-spread, and best known example of a larval form is the nauplius sensu lato (Dahms, 2000; Scholtz, 2000; Waloßek and Maas, 2005; see also below, section “EvoDevo”).”
Phylogeny of Branchiopoda (Crustacea) - Character Evolution and Contribution of Uniquely Preserved Fossils (2009, background): “The most parsimonious solution when this character (59) is mapped on the preferred tree is that the free-living larvae in Leptodora have reappeared, analogous to what SCHOLTZ (2000) suggested for the free-living nauplius stage in malacostracan crustaceans, but I fi nd this diffi cult to accept.”
The Articulata hypothesis – or what is a segment? (2002, background): “The presence of ectodermal teloblasts is even more restricted, they occur only in clitellate annelids (Dohle 1972, 1999) and in malacostracan and probably cirripede crustaceans (Anderson 1973, Dohle & Scholtz 1988, Scholtz 2000).”
FOSSIL CALIBRATIONS FOR THE ARTHROPOD TREE OF LIFE (2016, background): “Analyses of whole mitochondrial genomes place Euphausiacea (krill) within Decapoda (Shen et al., 2015), a result congruent with acquisition of a nauplius larval stage (though this is accepted as convergent: (Jirikowski et al., 2013; Scholtz, 2000).”
The Tetraconata concept: hexapod-crustacean relationships and the phylogeny of Crustacea (2002, background): “In Crustacea without a free-living orthonauplius, e.g. Stomatopoda, Anaspidacea, most Decapoda, a particular embryonic stage called an egg-nauplius occurs (Scholtz 2000).”
Decapod crustacean phylogenetics (2009, background): “Some groups hatch as a nauplius larva, whereas others hatch at later stages (such as zoea larvae) or exhibit direct development with hatchlings looking like small adults (Scholtz 2000).”