Cypris larvae of acrothoracican barnacles (Thecostraca: Cirripedia: Acrothoracica)

Kolbasov, Gregory A.; Høeg, Jens T.

doi:10.1016/j.jcz.2007.03.001

Cited by 25 publications

(20 citation statements)

References 37 publications

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“…The morphology and setation of the fourth segment vary even more extensively than that of the third (Nott and Foster, 1969;Clare and Nott, 1994;Kolbasov et al, 1999;Blomsterberg et al, 2004), but only a couple of studies have suggested schemes for the homology of its setation across all Cirripedia (Høeg and Rybakov, 1996;Kolbasov and Høeg, 2007). From the few well-studied thoracicans it seems that the fourth segment carries a basic set of four subterminal and five terminal setae as seen here in Ibla.…”

Section: Antennulesmentioning

confidence: 71%

“…Cyprids of the Acrothoracica seems to have a ground pattern setation like the one in the Thoracica, but several taxa have interesting specializations (Kolbasov and Høeg, 2007). Setae A and B are smooth just as in Ibla, so the presence of setules in other thoracicans may represent an apomorphy.…”

Section: Antennulesmentioning

confidence: 96%

“…The morphology of the attachment disc itself varies considerably among cirripede cyprids. In Ibla, the elongated attachment disc with the surface angled ventrally resembles the morphology seen in the Rhizocephala, Acrothoracica and scalpellid Thoracica, but it differs from the bell-shaped type with a distally facing attachment surface that prevails in balanomorphan Thoracica (Moyse et al, 1995;Kolbasov and Høeg, 2007). The bell-shaped variety, normally considered ''typical'' of all thoracicans, is probably a specialization in species that settle in high energy habitats of the rocky intertidal (Moyse et al, 1995).…”

Section: Antennulesmentioning

confidence: 98%

“…The Rhizocephala also differ significantly in having, in the ground pattern, the ps3 seta elaborated as a large aesthetasc, whereas no other cirripede cyprids carry aesthetascs on the third segment. In the Acrothoracica, antennular morphology has been less studied, but on the second and third segment the ground pattern seems to comprise a ps2, a pds, an ads and a diminutive ps3 seta (Moyse et al, 1995;Kolbasov et al, 1999;Kolbasov and Høeg, 2007).…”

Section: Antennulesmentioning

confidence: 99%

“…The segmentation and setation of the cypris thoracopods have received much less attention than the antennules, and detailed SEM-based information exists for only a handful of cirripede species Kolbasov et al, 1999;Rybakov et al, 2002;Kolbasov and Høeg, 2007). In the ground pattern for the Thecostraca there are three segments in the endopod and two segments in the exopod (Grygier, 1987).…”

Section: Thoracopodsmentioning

confidence: 99%

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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: Antennulesmentioning

confidence: 71%

Section: Antennulesmentioning

confidence: 96%

Section: Antennulesmentioning

confidence: 98%

Section: Antennulesmentioning

confidence: 99%

Section: Thoracopodsmentioning

confidence: 99%

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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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On the morphology of antennular sensory and attachment organs in cypris larvae of the deep‐sea vent/seep barnacles, Ashinkailepas and Neoverruca

Yorisue

Chan

Kado

et al. 2016

Journal of Morphology

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Barnacle cypris larvae show high morphological variation in the organs used in search of and attaching to a substratum. This variation may represent adaptation to the habitat of the species. Here, we studied SEM level morphologies of cypris antennular sensory and attachment organs in a deep-sea vent endemic species (Neoverruca sp.) and a vent/seep inhabiting species (Ashinkailepas seepiophila). We compare them with three species from other environments. The antennular morphologies of Neoverruca sp. and A. seepiophila were similar, which is consistent with recent molecular studies showing a close relationship of the two species. The setation pattern of the antennules was very conservative among species from various environments. In contrast, striking differences were observed in the structure of the attachment organ (the third antennular segment). Neoverruca sp. and A. seepiophila had no velum or a skirt surrounding the attachment disc on the third segment, while other cirripede cyprids almost always have either of these structures. In addition, both cyprids of A. seepiophila and Neoverruca sp. had the attachment disc angled toward the substratum, whereas it faces distally in cyprids from hard bottom inhabiting barnacles. We suggest that both velum/skirt and the angle of the attachment disc play an important role, when the antennules are contacting the substratum during surface exploration. Differences in attachment organ structures may be highly adaptive, enabling cirripede species to enter new habitats during evolution.

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A new species of Synagoga (Crustacea: Thecostraca: Ascothoracida) parasitic on an antipatharian from the Azores and Cape Verde Islands, with notes on its morphology, sexuality, host specificity, and biogeography

Kolbasov

Newman

2018

Mar Biodiv

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Cypris larvae of acrothoracican barnacles (Thecostraca: Cirripedia: Acrothoracica)

Cited by 25 publications

References 37 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

On the morphology of antennular sensory and attachment organs in cypris larvae of the deep‐sea vent/seep barnacles, Ashinkailepas and Neoverruca

A new species of Synagoga (Crustacea: Thecostraca: Ascothoracida) parasitic on an antipatharian from the Azores and Cape Verde Islands, with notes on its morphology, sexuality, host specificity, and biogeography

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