Two modes of development in the morphospecies Crepidula dilatata (Gastropoda: Calyptraeidae) from Southern Chile

Gallardo, Carlos S.

doi:10.1007/bf00390998

Cited by 80 publications

(81 citation statements)

References 15 publications

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“…Individuals from different geographic locations were clearly identified through the observation of ovicapsules and classified according to developmental modes described by Gallardo (1977). Haplotype diversity of C. dilatata ranged between 0.159 and 0.807, whereas haplotype diversity of C. fecunda ranged between 0.571 and 0.825 (Table I).…”

Section: Descriptive Analysis Of Sequence Datamentioning

confidence: 99%

“…Marine gastropods of the genus Crepipatella (Lesson, 1830) are among the most well-studied species of the family Calyptraeidae (Gallardo 1977(Gallardo , 1979Collin 2003;Véliz et al 2003;Chaparro et al 2005;Collin et al 2007), and recent studies indicate that there are five valid species: C. dilatata (Lamarck, 1822), C. capensis (Quoy & Gaimard, 1833), C. dorsata (Broderip, 1834), C. lingulata (Gould, 1846), and C. fecunda (Gallardo, 1979). Two of these species, C. fecunda and C. dilatata, inhabit rocky shores along the Chilean and Argentinean coasts.…”

Section: Introductionmentioning

confidence: 99%

“…C. dilatata exhibits intracapsular development with embryos that consume uncleaved nurse eggs, and hatch as crawling juveniles with a shell length of about 1100-1200 µm. On the other hand, C. fecunda exhibits pelagic development, embryos do not consume nurse eggs, and they hatch as planktotrophic larvae at a size of 400-500 µm (Gallardo 1977(Gallardo , 1979Chaparro et al 2002;Véliz et al 2003;Collin et al 2007). …”

Section: Introductionmentioning

confidence: 99%

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Genetic diversity and population structure of two South American marine gastropods,Crepipatella dilatataandC. fecunda(Gastropoda: Calyptraeidae): Distinct patterns based on developmental mode

Guzmán

Núñez

Vejar³

et al. 2011

Italian Journal of Zoology

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Section: Descriptive Analysis Of Sequence Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic diversity and population structure of two South American marine gastropods,Crepipatella dilatataandC. fecunda(Gastropoda: Calyptraeidae): Distinct patterns based on developmental mode

Guzmán

Núñez

Vejar³

et al. 2011

Italian Journal of Zoology

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“…If food is indeed acquired directly by the radula, males would be able to take advantage of this locomotory phase to obtain food by rasping the substrate (Putnam 1964, Hoagland 1979, Chaparro et al 1998). The females, however, are completely sessile, at least during the incubation period, and sometimes permanently (Coe 1953, Gallardo 1977, Hoagland 1978, 1979. This sessile habit is associated with parental care of the capsules, which are deposited on the substrate beneath the shell of the female (Gallardo 1977, Cañete & Ambler 1992.…”

Section: Introductionmentioning

confidence: 99%

“…The females, however, are completely sessile, at least during the incubation period, and sometimes permanently (Coe 1953, Gallardo 1977, Hoagland 1978, 1979. This sessile habit is associated with parental care of the capsules, which are deposited on the substrate beneath the shell of the female (Gallardo 1977, Cañete & Ambler 1992. Owing to the restriction imposed by this parental care, the female limpet is unable to move around in search of new areas of substrate to graze with the radula (assuming that the radula is used for this purpose), although rasping may contribute slightly to the nutrition of the female by exploiting the biofilm growing on the underlying substrate (Chaparro et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Feeding mechanisms in the gastropod Crepidula fecunda

Chaparro¹,

Thompson²,

Pereda³

2002

Mar. Ecol. Prog. Ser.

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The gastropod Crepidula fecunda feeds in 2 distinct ways: grazing of the substrate and suspension feeding. The taenioglossan radula plays a role in both processes. In the former, the radula rasps the surface, and the material is immediately ingested. This means of food acquisition is mainly used by motile individuals, i.e. juveniles and adult males. Adult females are sessile, and are only able to rasp the area beneath the head region, severely limiting the amount of food acquired. Females brooding egg capsules are even more restricted, since the area normally grazed is occupied by the capsule mass. The second mode of feeding, suspension feeding, is exhibited by late juveniles and all adults. Suspended particles are captured in mucous nets on the ventral and dorsal surfaces of the single gill lamella. The entrained particles, loosely bound in mucus, are transported by ciliary action to the distal tips of the filaments, which are bulbous. The material accumulates in 2 mucous strings which traverse the ventral surfaces of the filaments at right angles to the filaments along the entire length of the distal margin of the gill. These strings coalesce into a single, thicker string, which is transferred at intervals to a food canal in the neck, where it is twisted into a compact, mucous cord by a spiral action of the neck canal musculature. The cord is moved through the neck canal to the buccal region, where it is grasped by the radula and ingested. Some material from the gill does not enter the neck canal but is carried by ciliary tracts to a modified region in the mantle, the food pouch, where it is compacted into a mucous ball, which is picked up by the radula and either ingested or rejected as pseudofaeces. In the case of rejection, the ball is pushed to the shell margin by the radula and lips. In C. fecunda food material is stored on the gill, allowing the radula time to undertake other tasks such as rasping the substrate and handling the mucous ball in the food pouch. This dual feeding mechanism diversifies the food and probably increases its nutritional value.

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Comparative Transcriptomics of Alternative Developmental Phenotypes in a Marine Gastropod

2016

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Alternative phenotypes are discrete phenotypic differences that develop in response to both genetic and environmental cues. Nutritive embryos, which arrest their development to serve as nutrition for their viable siblings, are an example of an alternative developmental phenotype found in many animal groups. Females of the marine snail, Crepidula navicella, produce broods that consist mainly of nutritive embryos and a small number of viable embryos. In order to better understand the genetic mechanisms that lead to the development of alternative phenotypes in this species, we compared the transcriptomes of viable and nutritive embryos at the earliest stage that we were able to distinguish visually between the two. Using high-throughput Illumina sequencing, we assembled and annotated a de novo transcriptome and compared transcript levels in viable and nutritive embryos. Viable embryos express high levels of transcripts associated with known developmental events, while nutritive embryos express high levels of apoptosis-related transcripts. Gene Ontology term enrichment with GOSeq found that these are associated with the negative regulation of apoptotic processes. This enrichment, combined with morphological evidence, suggests that apoptosis is important in the formation of gastrula-like nutritive embryos. Apoptosis has been implicated in the development of alternative phenotypes in other animal groups, raising the possibility that this mechanism's role in alternative phenotypes is conserved in gastropod development. We suggest possible alternative mechanisms of nutritive embryo development. Most importantly, we contribute further evidence to the hypothesis that nutritive embryos are an alternative developmental phenotype.

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Two modes of development in the morphospecies Crepidula dilatata (Gastropoda: Calyptraeidae) from Southern Chile

Cited by 80 publications

References 15 publications

Genetic diversity and population structure of two South American marine gastropods,Crepipatella dilatataandC. fecunda(Gastropoda: Calyptraeidae): Distinct patterns based on developmental mode

Genetic diversity and population structure of two South American marine gastropods,Crepipatella dilatataandC. fecunda(Gastropoda: Calyptraeidae): Distinct patterns based on developmental mode

Feeding mechanisms in the gastropod Crepidula fecunda

Comparative Transcriptomics of Alternative Developmental Phenotypes in a Marine Gastropod

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