Arthropod Post-embryonic Development

Minelli, Alessandro; Fusco, Giuseppe

doi:10.1007/978-3-662-45798-6_5

Cited by 57 publications

(55 citation statements)

References 119 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An alternative, that the nauplius-like larva was ancestral in Euarthropoda, seems unlikely, as early noneucrustacean crustaceans also possessed a hatching larva with the antennula plus three pairs of appendages (5). In either case, however, the phylogenetic position of Leanchoilia (21) supports our conclusion that a larva with just a few anterior limb-bearing segments, which adds segments after hatching [anamorphosis (24)], not only occurs in eucrustaceans (8,14) but was also present in all other major arthropod groups (25)(26)(27), i.e., in the ground pattern of Euarthropoda. Such indirect development with segment-poor larvae can be understood as the evolutionary trigger for an efficient distribution of early euarthropods.…”

Section: Discussionsupporting

confidence: 53%

Three-dimensionally preserved minute larva of a great-appendage arthropod from the early Cambrian Chengjiang biota

Liu

Melzer

Haug

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

A three-dimensionally preserved 2-mm-long larva of the arthropod Leanchoilia illecebrosa from the 520-million-year-old early Cambrian Chengjiang biota of China represents the first evidence, to our knowledge, of such an early developmental stage in a shortgreat-appendage (SGA) arthropod. The larva possesses a pair of three-fingered great appendages, a hypostome, and four pairs of well-developed biramous appendages. More posteriorly, a series of rudimentary limb Anlagen revealed by X-ray microcomputed tomography shows a gradient of decreasing differentiation toward the rear. This, and postembryonic segment addition at the putative growth zone, are features of late-stage metanauplii of eucrustaceans. L. illecebrosa and other SGA arthropods, however, are considered representative of early chelicerates or part of the stem lineage of all euarthropods. The larva of an early Cambrian SGA arthropod with a small number of anterior segments and their respective appendages suggests that posthatching segment addition occurred in the ancestor of Euarthropoda.Cambrian radiation | 3D preservation | micro-CT | arthropod larva | Chengjiang biota

show abstract

Section: Discussionsupporting

confidence: 53%

Three-dimensionally preserved minute larva of a great-appendage arthropod from the early Cambrian Chengjiang biota

Liu

Melzer

Haug

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…The origin of this constraint, and whether it is linked to the colonization of the subterranean environment, remains speculative, but may be related to the existence of programmed timers for the completion of metamorphosis [12] or the specific cell division rate and determination [13,14]. Our results show an increased evolutionary variability of the number of instars with respect to other developmental constraints, in agreement with the view that growth and development are decoupled from traditionally recognized strict boundaries in insect ontogeny, such as moulting [6,11].…”

Section: Discussionsupporting

confidence: 84%

“…However, with the use of a comprehensive molecular phylogeny, it has recently been shown that the number of independent origins of life cycle modification was low, with a single one in the Pyrenees, the geographical area for which most data are available [10]. In this lineage, there was a single transition during the Late Oligocene-Early Miocene from an ancestral 3-instar cycle [11] in species living in forest litter or under stones to a 2-instar cycle in species with fully subterranean habits (either in deep or shallow subterranean environments), in which the active larva still feeds. From within this lineage with a 2-instar cycle, there was then a single transition to a 1-instar, non-feeding larva in the Lower Miocene, in a lineage found today only in the deep subterranean environment of caves [10].…”

Section: Introductionmentioning

confidence: 99%

Developmental constraints in cave beetles

2014

View full text Add to dashboard Cite

In insects, whilst variations in life cycles are common, the basic patterns typical for particular groups remain generally conserved. One of the more extreme modifications is found in some subterranean beetles of the tribe Leptodirini, in which the number of larval instars is reduced from the ancestral three to two and ultimately one, which is not active and does not feed. We analysed all available data on the duration and size of the different developmental stages and compared them in a phylogenetic context. The total duration of development was found to be strongly conserved, irrespective of geographical location, habitat type, number of instars and feeding behaviour of the larvae, with a single alteration of the developmental pattern in a clade of cave species in southeast France. We also found a strong correlation of the size of the first instar larva with adult size, again regardless of geographical location, ecology and type of life cycle. Both results suggest the presence of deeply conserved constraints in the timing and energy requirements of larval development. Past focus on more apparent changes, such as the number of larval instars, may mask more deeply conserved ontogenetic patterns in developmental timing.

show abstract

“…Simultaneously, the anteriormost pygidial segment was added (released) into the thorax by the formation of a new articulation. The thorax comprised fully articulated segments [8,9] (see [10] for an outline of trilobite ontogeny and [7] for details of A. koninckii segmentation mode).…”

Section: Introductionmentioning

confidence: 99%

Positional specification in the segmental growth pattern of an early arthropod

2014

Self Cite

View full text Add to dashboard Cite

In many arthropods, there is a change in relative segment size during post-embryonic development, but how segment differential growth is produced is little known. A new dataset of the highest quality specimens of the 429 Myr old trilobite Aulacopleura koninckii provides an unparalleled opportunity to investigate segment growth dynamics and its control in an early arthropod. Morphometric analysis across nine post-embryonic stages revealed a growth gradient in the trunk of A. koninckii . We contrastively tested different growth models referable to two distinct hypotheses of growth control for the developing trunk: (i) a segment-specific control, with individual segments having differential autonomous growth progression, and (ii) a regional control, with segment growth depending on their relative position along the main axis. We show that the trunk growth pattern of A. koninckii was consistent with a regional growth control producing a continuous growth gradient that was stable across all developmental stages investigated. The specific posterior-to-anterior decaying shape of the growth gradient suggests it deriving from the linear transduction of a graded signal, similar to those commonly provided by morphogens. A growth control depending on a form of positional specification, possibly realized through the linear interpretation of a graded signal, may represent the primitive condition for arthropod differential growth along the main body axis, from which the diverse and generally more complex forms of growth control in subsequent arthropods have evolved.

show abstract

Arthropod Post-embryonic Development

Cited by 57 publications

References 119 publications

Three-dimensionally preserved minute larva of a great-appendage arthropod from the early Cambrian Chengjiang biota

Three-dimensionally preserved minute larva of a great-appendage arthropod from the early Cambrian Chengjiang biota

Developmental constraints in cave beetles

Positional specification in the segmental growth pattern of an early arthropod

Contact Info

Product

Resources

About