Sexual behavior, insemination and development of the freshwater leech <i>Helobdella stagnalis</i> (Annelida, Hirudinea, Glossiphoniidae)

Romdhane, Yasmina; Ahmed, Raja Ben; Tekaya, Saïda

doi:10.1080/07924259.2017.1340354

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…In previous studies, reproductive life histories for Helobdella have been inferred from systematic measurements of size and reproductive status of wild-caught animals at different times of year for species identified as H . stagnalis in Wales [47,48] and in Tunisia [49]. The conclusion of these studies was that H .…”

Section: Discussionmentioning

confidence: 99%

Reproductive differences among species, and between individuals and cohorts, in the leech genus Helobdella (Lophotrochozoa; Annelida; Clitellata; Hirudinida; Glossiphoniidae), with implications for reproductive resource allocation in hermaphrodites

et al. 2019

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Leeches and oligochaetes comprise a monophyletic group of annelids, the Clitellata, whose reproduction is characterized by simultaneous hermaphroditism. While most clitellate species reproduce by cross-fertilization, self-fertilization has been described within the speciose genus Helobdella . Here we document the reproductive life histories and reproductive capacities for three other Helobdella species. Under laboratory conditions, both H . robusta and H . octatestisaca exhibit uniparental reproduction, apparently reflecting self-fertility, and suggesting that this trait is ancestral for the genus. However, the third species, H . austinensis , seems incapable of reproduction by self-fertilization, so we inferred its reproductive life history by analyzing reproduction in breeding cohorts. Comparing the reproductive parameters for H . robusta reproducing in isolation and in cohorts revealed that reproduction in cohorts is dramatically delayed with respect to that of isolated individuals, and that cohorts of leeches coordinate their cocoon deposition in a manner that is not predicted from the reproductive parameters of individuals reproducing in isolation. Finally, our comparisons of reproductive capacity for individuals versus cohorts for H . robusta , and between different sizes of cohorts for H . austinensis , reveal differences in resource allocation between male and female reproductive roles that are consistent with evolutionary theory.

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Section: Discussionmentioning

confidence: 99%

Reproductive differences among species, and between individuals and cohorts, in the leech genus Helobdella (Lophotrochozoa; Annelida; Clitellata; Hirudinida; Glossiphoniidae), with implications for reproductive resource allocation in hermaphrodites

et al. 2019

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“…Oviposition in clitellate annelids (i.e., oligochaetes and leeches) is the process during which eggs stored in the ovisac or those fertilized internally are deposited outside the body. One of the characteristics of clitellate oviposition is that the deposited eggs rest in a capsule or cocoon that is formed by the secretion of the clitellum (Foot 1898;Grove and Cowley 1926;Penners 1933;Hirao 1965;Suzutani 1977;Suzutani-Shiota 1980;Romdhane et al 2017;Saidel et al 2017). It has also been demonstrated that at the final phase of clitellate oviposition, the body anterior to and including the clitellum is withdrawn backwards from the posterior margin of the cocoon (Figure 1(a); Foot and Strobell 1902;Grove and Cowley 1926;Hirao 1965).…”

Section: Introductionmentioning

confidence: 99%

Oviposition behaviour in the clitellate annelid Tubifex tubifex: video recordings of mature worms under laboratory culture conditions

Shimizu

2020

Invertebrate Reproduction & Development

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In the present study, videos were recorded to observe oviposition in living, mature worms of Tubifex tubifex. After the formation of a lemon shaped cocoon around the clitellum at segments 11 and 12, mature eggs that have been stored in the ovisac at segments 12-14 begin to move into segments 11-12 through the constricted posterior end of the cocoon. Within a second or so, ovisac eggs emerge out of the posterior margin and return to the posterior segments. Such movements are repeated several times before the ovisac eggs settle in the ovarian coelom of segment 11. Within a few seconds of the eggs moving into the ovarian coelom, the clitellar region begins to change its contour slightly; it looks as if something round is tapping on the coelomic wall of this region. As this tapping ceases, the coelomic eggs begin to move to the space between the cocoon and the clitellum. Coelomic eggs are individually squeezed out of the female gonopores located near the midpoint of the cocoon. This process, referred to as egg deposition, is accomplished within 30 s. The egg deposition is followed by the backward withdrawal of the anterior segments from the cocoon.

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Population and reproductive patterns of the Neotropical planarian Girardia capacivasa (Platyhelminthes, Tricladida), and the influence of seasonality on its life history

Francavilla

Negrete

Colpo

et al. 2018

Zoologischer Anzeiger

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Sexual behavior, insemination and development of the freshwater leech Helobdella stagnalis (Annelida, Hirudinea, Glossiphoniidae)

Cited by 5 publications

References 30 publications

Reproductive differences among species, and between individuals and cohorts, in the leech genus Helobdella (Lophotrochozoa; Annelida; Clitellata; Hirudinida; Glossiphoniidae), with implications for reproductive resource allocation in hermaphrodites

Reproductive differences among species, and between individuals and cohorts, in the leech genus Helobdella (Lophotrochozoa; Annelida; Clitellata; Hirudinida; Glossiphoniidae), with implications for reproductive resource allocation in hermaphrodites

Oviposition behaviour in the clitellate annelid Tubifex tubifex: video recordings of mature worms under laboratory culture conditions

Population and reproductive patterns of the Neotropical planarian Girardia capacivasa (Platyhelminthes, Tricladida), and the influence of seasonality on its life history

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