External structures used during attachment and sperm transfer in tubificids (Annelida, Oligochaeta)

Cuadrado, Sergio; Martínez‐Ansemil, Enrique

doi:10.1007/978-94-010-0597-5_12

Cited by 9 publications

(8 citation statements)

References 4 publications

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“…Similar sense organs are scattered on their entire surface or more or less organized into one or more intercalated rows. Ciliate sense organs were also observed on the genital region, including the singular anchorage bridge recently described by Cuadrado and Martínez-Ansemil (2001); sense organs of short cilia (1.4 -3.4 m long) are especially abundant near the penial chaetae.…”

Section: Tubificidaementioning

confidence: 59%

“…In the last three decades, a few studies using scanning electron microscopy (SEM) revealed some data concerning morphology and distribution of external sense organs in almost 20 species of oligochaetes, but with respect to the freshwater ones, only two species of tubificids and one species of branchiobdellid (a monophyletic group of Clitellata whose inclusion among the Oligochaeta is still under debate) were studied in detail (Farnesi et al, 1982a,b;Smith, 1983); partial data were also given for three other species of freshwater tubificids (Chapman, 1979;Cuadrado and Martínez-Ansemil, 2001).…”

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confidence: 99%

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External sense organs in freshwater oligochaetes (Annelida, Clitellata) revealed by scanning electron microscopy

2006

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Freshwater oligochaetes have at least two kinds of external sense organs: multiciliate organs of short cilia (also present in earthworms) and sense organs with one to three long cilia (unknown in earthworms and possibly acting as rheoreceptors). Ciliate sense organs of freshwater oligochaetes are distributed over their entire body surface, including the clitellum. They are scattered on the prostomium and pigidium and are arranged into a transversal chaetal row and dispersed or forming a few other discrete transversal rows on chaetal segments. Three species display very prominent sense organs (sensory buds in Protuberodrilus tourenqui and papillae in Ophidonais serpentina and Spirosperma velutinus). The number of cilia per organ at the prostomium of freshwater families appears to be fewer than that of terrestrial ones. It is suggested that the total number of cilia at the prostomium of the freshwater species could be related to their habitat, evolving from an epibenthic to an endobenthic way of life.

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Section: Tubificidaementioning

confidence: 59%

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confidence: 99%

External sense organs in freshwater oligochaetes (Annelida, Clitellata) revealed by scanning electron microscopy

2006

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“…Yet, we are far from understanding the reproductive biology of these animals and cannot even guess at the interrelations between the form and function of external genital structures in these hermaphroditic organisms. The paper by Cuadrado & Martinez-Ansemil (2001), although dealing with limnetic tubificid species, gives an example about differentiation of structures required for copulation and sperm exchange. Our lack of knowledge in this field is apparent in those species where number and position of genital organs and openings deviates from normal (e.g., mid-dorsal opening of spermathecae).…”

Section: Reproductive Biologymentioning

confidence: 98%

Ecology and Biology of Marine Oligochaeta – an Inventory Rather than another Review

Giere

2006

Hydrobiologia

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Instead of updating the1982-review by Giere & Pfannkuche, it was deemed more useful to highlight some recent and relevant studies given the limited number of new and pertinent publications. In addition, new data on population ecology, some recent results on symbiotic associations and descriptions of adaptations to oxygen deficiency and hydrogen sulfide will be commented on. The scarcity of new ecological and biological studies on marine Oligochaeta, an animal group that often attains key positions in important shore areas, is alarming. Future research efforts on this ecologically relevant annelid group are seriously needed.

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“…This category includes the dart‐shaped ‘love darts’ (Fig. F) of stylommatophoran land snails (Davison et al ., ; Koene & Schulenburg, ), the copulatory setae in earthworms (Cuadrado & Martinez‐Ansemil, ; Koene et al ., ), the teeth of plethodontid salamanders involved in copulatory biting (Houck & Reagan, ; Rollmann, Houck & Feldhoff, ; Houck & Arnold, ), the sting of scorpions that display a ‘sexual sting’ ritual (Inceoglu et al ., ), and male fang use in a wolf spider (Johns et al ., ). Consistent with the paternity‐benefit hypothesis, mucus delivered with the snail's love dart has been shown to increase a successful shooter's fertilisation success (Chase & Blanchard, ), while setal gland products in earthworms increase the partner's refractory period and sperm uptake (Koene et al ., ), and secretions transferred during copulatory biting in salamanders increase current receptivity and shorten time to sperm transfer (Houck & Reagan, ; Rollmann et al ., ).…”

Section: Categorisation Of Traumatic Mating Strategiesmentioning

confidence: 99%

Functions, diversity, and evolution of traumatic mating

et al. 2013

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Copulation can involve the wounding of the mating partner by specialised devices. This type of mating, which we term traumatic mating, has been regarded as exceptional. Its prevalence, however, has not been compared across taxa, nor have its functions and putative evolutionary pathways. A categorisation has been lacking to date. We here show that traumatic mating is a widespread and diverse phenomenon that likely evolved via several pathways. Its putative functions include: (i) anchorage during mating; (ii) stimulation of short-term female reproductive investment; (iii) male paternity advantages; and (iv) enhanced fertilisation efficiency in transitions to internal fertilisation. Both natural and sexual selection have likely contributed to the parallel evolution of traumatic intromittent organs in phylogenetically distant taxa. These organs are sometimes remarkably similar in shape and often, but not always, inject sperm. The target sites of trauma infliction and the nature of secretions delivered alongside sperm are thus far poorly studied, but data on both are needed to elucidate the function of traumatic mating. The few existing studies that explicitly quantify fitness impacts of traumatic mating indicate that this strategy may often be costly to the party being wounded. However, a comprehensive approach to assess overall investments and returns for both sexes is a major target for future work. Finally, for the first time, we corroborate quantitatively the hypothesis that traumatic mating evolved relatively more often among hermaphroditic than among gonochoric taxa.

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External structures used during attachment and sperm transfer in tubificids (Annelida, Oligochaeta)

Cited by 9 publications

References 4 publications

External sense organs in freshwater oligochaetes (Annelida, Clitellata) revealed by scanning electron microscopy

External sense organs in freshwater oligochaetes (Annelida, Clitellata) revealed by scanning electron microscopy

Ecology and Biology of Marine Oligochaeta – an Inventory Rather than another Review

Functions, diversity, and evolution of traumatic mating

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