The Chemoreceptive Lattice Organs in Cypris Larvae Develop from Naupliar Setae (Thecostraca: Cirripedia, Ascothoracida and Facetotecta)

Rybakov, A. V.; Høeg, Jens T.; Jensen, Peter Gram; Kolbasov, Gregory A.

doi:10.1078/0044-5231-00084

Cited by 36 publications

(22 citation statements)

References 31 publications

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“…The Acrothoracica and all noncirripede Thecostraca (Ascothoracida, Facetotecta) have a posterior position of the pore in LO1 and a more plesiomorphic ''crest-in-trough'' type of lattice organs, indicating their ontogenetic origin from simple setae in the late nauplii (Jensen et al, 1994a,b;Høeg and Kolbasov, 2002;Kolbasov et al, 2008). The two distinct pairs of setae on the naupliar shield of Ibla are homologous to those found in many other thecostracan late nauplii and are precursors of the LO1 and LO2 pairs of lattice organs in the cyprid (Rybakov et al, 2003). The distinct pores at the tip of these setae are equivalent to the terminal pores in the lattice organs.…”

Section: Discussionmentioning

confidence: 96%

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Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Høeg

Achituv

Chan

et al. 2008

Journal of Morphology

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We used scanning electron microscopy (SEM) to describe cypris morphology in species of the barnacles Ibla and Paralepas, both of which are pivotal in understanding cirripede evolution. In Ibla, we also studied late naupliar stages with video and SEM. Special emphasis was put on the lattice organs, the antennules and the thorax and telson. In Paralepas we had settled specimens only and could therefore only investigate the carapace with the lattice organs. Cyprids of Ibla quadrivalvis and Paralepas dannevigi have five sets of lattice organs, grouped as two anterior and three posterior pairs. The organs are of the pore-field type and the terminal pore is situated anteriorly in the first pair, just as in the Rhizocephala and the Thoracica. In Ibla the armament of antennular sensilla resembles that found in the Thoracica but differs from the Rhizocephala. The absence of setules on the A and B setae sited terminally on the fourth antennular segment is a similarity with the Acrothoracica. The attachment disc is angled rather than facing distally and is encircled by a low cuticular velum. The thoracopods have two-segmented endopods and exopods as in the Thoracica, but the number, shape, and position of thoracopodal setae differ somewhat from other species of that superorder. Both Ibla and Paralepas cyprids have a deeply cleaved telson, but no independent abdominal part. In cypris morphology, Ibla and Paralepas show several synapomorphies with the clade comprising Rhizocephala and Thoracica and there are no specific apomorphies with either the Acrothoracica, the Rhizocephala or any particular subgroup within the Thoracica. This is in agreement with recent molecular evidence that Ibla (Ibliformes) is the sister taxon to all other Thoracica and the ibliforms therefore become the outgroup of choice for studying character evolution within the superorder. Paralepas, and other pedunculated barnacles without shell plates, are apparently not primitive but are secondarily evolved and nested within the Thoracica.

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Section: Discussionmentioning

confidence: 96%

“…The LO2 in Paralepas deviates by having a curved shape, and it is interesting that whenever a lattice organ stands out with a different morphology from the rest it is habitually this pair (Jensen et al, 1994b;Rybakov et al, 2002;Rybakov et al, 2003). The diminutive or missing termi- Fig.…”

Section: Lattice Organsmentioning

confidence: 97%

Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Høeg

Achituv

Chan

et al. 2008

Journal of Morphology

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“…To his list we can now add the presence of five pairs of chemosensory lattice organs on the carapace of the cypridoid larva [50,52-54]. These structures have not been found in any other crustaceans.…”

Section: Discussionmentioning

confidence: 99%

Remarkable convergent evolution in specialized parasitic Thecostraca (Crustacea)

2009

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Background: The Thecostraca are arguably the most morphologically and biologically variable group within the Crustacea, including both suspension feeders (Cirripedia: Thoracica and Acrothoracica) and parasitic forms (Cirripedia: Rhizocephala, Ascothoracida and Facetotecta). Similarities between the metamorphosis found in the Facetotecta and Rhizocephala suggests a common evolutionary origin, but until now no comprehensive study has looked at the basic evolution of these thecostracan groups.

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“…In most species they appear only as an elongated area of small pores that connects with a chamber in the carapace that contains the sensory cells. In some species they can be traced back to specifi c openended setae in the late nauplii (Rybakov et al 2003 ). In addition to the nauplius eye, most cyprids also sport a pair of motile compound eyes (Walley 1969 ;Hallberg and Elofsson 1983 ), whose function is obscure.…”

Section: Nervous System and Sensory Organsmentioning

confidence: 99%

“Crustacea”: Cirripedia

Høeg

Deutsch

Chan

et al. 2015

Evolutionary Developmental Biology of Invertebrates 4

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The Chemoreceptive Lattice Organs in Cypris Larvae Develop from Naupliar Setae (Thecostraca: Cirripedia, Ascothoracida and Facetotecta)

Cited by 36 publications

References 31 publications

Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Remarkable convergent evolution in specialized parasitic Thecostraca (Crustacea)

“Crustacea”: Cirripedia

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