The Developmental Stages of Paracalanus Crassirostris Dahl, 1894 (Copepoda, Calanoida)1)

Grice, George D.; Lawson, Thomas J.

doi:10.1163/156854073x00056

Cited by 29 publications

(12 citation statements)

References 12 publications

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“…To ensure proper developmental staging of animals, eggs were collected at day 0, and individual stages were harvested according to McKinnon et al (2003). Additional morphological features such as number of segments (Mauchline, 1998), length (McKinnon et al, 2003), and appendage features (Lawson and Grice, 1973) were also used to identify developmental stage.…”

Section: Materials and Methods Collectionmentioning

confidence: 99%

Novel organization and development of copepod myelin. i. ontogeny

Wilson

Hartline

2011

J of Comparative Neurology

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Nerve impulse conduction is greatly increased by myelin, a multilayered membranous sheath surrounding axons. Best known from and most extensively investigated among vertebrates, a few invertebrates, including some superfamilies of copepod, have functionally and structurally similar myelin-like sheaths surrounding their axons. We examined the development of myelin ultrastructure in Bestiolina similis, a paracalanoid copepod. Development occurred in a novel way: initial myelination always appeared first as a partial layer, which in later stages came to encircle an axon completely. This partial myelin first appeared in a single pair of reidentifiable fibers, at the second naupliar stage. Two additional pairs of reidentifiable fibers also became partially myelinated by the third naupliar stage. The number of myelin layers in this trio of axon pairs increased with development, but, at any one stage, each axon had the same number of layers along its entire length. These axons disappeared after the copepodite metamorphosis. After metamorphosis, the fiber that took over as largest in the nerve cord became the most heavily myelinated and was identified as the lateral dorsal giant fiber. The rate of myelination was also characterized in the antennular nerve as a representative of the peripheral nervous system. As axons became larger, they were more likely to be partially, and then completely, myelinated, the latter having a lower ratio of axon core to fiber diameter than the former. Copepod myelin is an instructive example of convergent evolution, with far-reaching consequences for nervous system functioning and the behavior that nervous systems subserve.

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Section: Materials and Methods Collectionmentioning

confidence: 99%

Novel organization and development of copepod myelin. i. ontogeny

Wilson

Hartline

2011

J of Comparative Neurology

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“…The naupliar body of centropagoideans does elongate posteriorly, but this posterior section is not distinctly separate, nor does it bear spine-like setae (e.g., see Lawson and Grice 1970;Grice 1971;Grice and Gibson 1982). A distinctly separate posterior section of the naupliar body with spine-like setae is present on calanoids like Eucalanus bungi bungi Giesbrecht 1893, Parvocalanus crassirostris (Dahl 1894), Neocalanus tonsus (Brady 1883), Calanoides macrocarinatus Brodsky 1957, and Calanus australis Brodsky 1959 (see Johnson 1937;Lawson and Grice 1973;Bradford et al 1988). However, spine-like setae on these calanoids are ventral or lateral, not dorsal or lateral, as is the case for Pseudocyclops sp.…”

Section: Discussionmentioning

confidence: 99%

Naupliar development of Pseudocyclops sp. (Copepoda: Calanoida: Pseudocyclopidae): description of an unusual set of character states

Ferrari¹,

Dahms‬

Kangtia

et al. 2013

Zool. Stud.

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Background: Naupliar development is known for only one other species of the calanoid taxon Pseudocyclopidae as yet. Results: Six naupliar stages are described from an as yet unnamed population of Pseudocyclops cultured at the John G. Shedd Aquarium in Chicago, IL. The naupliar body is divided into a deep anterior section and a shallow posterior section, although the posterior section is poorly defined at NI. The posterior section bears a long, thin mediodorsal seta; short thick setae are added during molts to NIII~NV. The posterior section does not bear limb buds except for the caudal ramus and is presumed to represent the anal segment of the copepod. Throughout naupliar development, the antennule is five-segmented, a uniquely high number for a calanoid copepod. The distal segment is broadened, and three proximal segments are foreshortened during the molt to NIII, and remain so thereafter. Setae are added dorsally and ventrally to the distal segment during each molt. The naupliar arthrite is a simple, seta-like structure on the coxa of the antenna of all naupliar stages. On the exopod of the antenna, setae are added to the segment adjacent to the proximal one during molts to NIV~NVI in a manner consistent with the model of ramal patterning. The gnathobase is added to the coxa of the mandible during the molt to NIV, but its ventral attenuations are lost during the molt to NVI. The endopod of the mandible significantly changes between stages NIII and NIV; setae originate dorsally rather than ventrally on the proximal endopodal segment. These unique changes are reversed during the molt to NVI. Conclusions: Many of these changes have not been reported for any other calanoid. The morphological restoration at NVI is particularly noteworthy.

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“…To confirm identification, the morphology of P. crassirostris females from Šibenik Bay was compared to the published descriptions and illustrations of this species in the following sources: Davis (1944), Tanaka (1960), Gonzalez & Bowmann (1965), Lawson & Grice (1973), Greenwood (1976), Ramirez (1976), Hiromi (1981), Zheng et al (1982), Bradford-Grieve (1994), Al-Yamani & Prusova (2003) and Vives & Shmeleva (2007).…”

Section: Analysis Of the Samplesmentioning

confidence: 99%

“…F. Dahl's original short and incomplete description of females from an estuary on the Atlantic coast of Brazil (F. Dahl, 1894) gave rise to taxonomical uncertainties, followed by the descriptions of several different forms (Früchtl, 1923;Davis, 1944;Wellershaus, 1969). The description of the typical form (P. crassirostris f. typica) was amended by Gonzalez & Bowmann (1965) and Greenwood (1976), while all developmental stages were described in detail by Lawson & Grice (1973).…”

Section: Introductionmentioning

confidence: 99%

First record of small tropical calanoid copepod Parvocalanus crassirostris (Copepoda, Calanoida, Paracalanidae) in the Adriatic Sea

et al. 2016

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In December 2014 the adult females and copepodites of alien paracalanid copepod Parvocalanus crassirostris were identified in the Central Adriatic port of Šibenik. The most probable transmission vector for this small copepod were ballast waters from the cargo ships that are regularly discharged at these locations. This paper is focused on P. crassirostris morphology and the state of population in the port of Šibenik. The possible path of introduction of Parvocalanus crassirostris into the Adriatic Sea is also discussed.

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The Developmental Stages of Paracalanus Crassirostris Dahl, 1894 (Copepoda, Calanoida)1)

Cited by 29 publications

References 12 publications

Novel organization and development of copepod myelin. i. ontogeny

Novel organization and development of copepod myelin. i. ontogeny

Naupliar development of Pseudocyclops sp. (Copepoda: Calanoida: Pseudocyclopidae): description of an unusual set of character states

First record of small tropical calanoid copepod Parvocalanus crassirostris (Copepoda, Calanoida, Paracalanidae) in the Adriatic Sea

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