Description de deux espéces jumelles du groupe <i>Tigriopus angulatus</i> (Copepoda, Harpacticoida) dans les archipels Crozet et Kerguelen (Terres Australes et Antarctiques Frangaises)

Soyer, Jacques; Thiriot-Quiévreux, Catherine; Colomines, Jean-Charles

doi:10.1111/j.1463-6409.1987.tb00061.x

Cited by 21 publications

(18 citation statements)

References 9 publications

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“…Crossbreeding experiments amongst Crozet, Kerguelen and San Francisco copepods all failed despite observations of mating. Subsequently, Soyer et al (1987) confirmed complete sexual isolation, different karyological patterns, and slight morphological differences between Kerguelen and Crozet. Two new species were erected; T. kerguelenensis and T. crozettensis, described as belonging to the T. angulatus' group, which appears in reality to be a complex of separate species, distinct from, but closely related to T. californicus.…”

Section: Introductionmentioning

confidence: 74%

“…Secondly, South Georgian adults of both sexes have six terminal setae on the single endopod segment of the mandible (Figure 2A); in contrast to only five in Antarctic ( Figure 2B) and Macquarie animals. It is evident that South Georgian T. angulatus' is at least as distinct morphologically from Antarctic Peninsula (Graham Land) T. angulatus' and from T. kerguelenensis or T. crozettensis, as are the last two species from each other (Soyer et al, 1987). It therefore seems probable that the South Georgian population of Tigriopus represents a separate, previously undescribed species.…”

Section: Anatomymentioning

confidence: 94%

“…is less well understood. Tigriopus brachydactylus Candeias (from Angola) was described by Candeias (1959), while T. angulatus' Lang has been described from widely dispersed sites, especially oceanic islands on the northern fringes of the Southern Ocean (see Soyer et al (1987) for a detailed review). Briefly, T. angulatus was originally described by Lang (1933) from Macquarie Island at 54-5°S, south of New Zealand/Tasmania, later reporting it from Campbell Island at 51°S, south of New Zealand (Lang, 1934).…”

Section: Introductionmentioning

confidence: 99%

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Environmental Tolerances of Three Species of The Harpacticoid Copepod GenusTigriopus

1997

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The harpacticoid copepod genusTigriopusis characteristic of shallow upper shore rock pools in both hemispheres.Tigriopusare necessarily physiologically tolerant as the pools feature extreme physicochemical conditions; their lower limit on the shore is apparently set by competition/predation. There are several species, differentiated by relatively minor morphological distinctions; speciation appears to be favoured by restricted gene flow between populations, even over short distances. This paper briefly reviews the literature concerned with the taxonomy, physiology and ecology of the genus, and compares environmental conditions and salinity/thermal tolerance data for three species: T.brevicornisfrom Scotland, T.fulvusfrom Madeira, and a previously undescribed population of the Southern Ocean ‘T. angulatus’ group from subantarctic South Georgia. Particularly interesting was a low upper lethal temperature in‘T. angulatus’(21·9°C) that probably restricts the species to relatively large pools that buffer environmental thermal extremes. Unlike the other species,T. fulvuscannot withstand freezing conditions. Evidence is presented to show that the South GeorgianTigriopusdiffers slightly, but significantly, in its morphology from two sibling species that inhabit the subantarctic Kerguelen and Crozet Islands but which cannot interbreed. If the South Georgian copepods are indeed a separate species and do not occur elsewhere (e.g. the Falklands), this indicates rapid speciation within the genus; the coasts of South Georgia were covered by an icecap until 10,000–14,000 years ago and no rock pool habitats were then available. It is suggested thatTigriopusmay have reached South Georgia by rafting withinEnteromorphatubes.

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Section: Introductionmentioning

confidence: 74%

Section: Anatomymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Environmental Tolerances of Three Species of The Harpacticoid Copepod GenusTigriopus

1997

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“…Tigriopus japonicus was described by Mori (1932) from Shimoda (Japan), and the species has been redescribed by Itô (1970) from Hokkaido (Japan). T. raki was described by Bradford (1967) from New Zealand; T. igai from Bonin Islands, Japan (Itô 1977); T. kerguelensis and T. crozettensis from the South Indian Ocean (Soyer et al 1987). Lang (1948) treated T. fulvus as synonymous with T. brevicornis.…”

Section: Discussionmentioning

confidence: 99%

A new species of Tigriopus (Copepoda, Harpacticoida, Harpacticidae) from Thailand with the description of its naupliar development

et al. 2011

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Both genders of Tigriopus thailandensis sp. nov. are described from a laboratory stock raised from individuals collected from the seaweed Enteromorpha clathrata in Thailand (Bangsaen Beach, Chonburi Province). Tigriopus thailandensis sp. nov. shares with its closest relative T. japonicus Mori, 1932 two setae on the third exopodal segment of leg 4 while other congeners bear 3 inner setae. However, allobasis and exopod of antenna in both genders are much more slender and elongate than in T. japonicus. All six naupliar stages of T. thailandensis are described from the offspring of isolated females. In comparison with nauplii of T. japonicus, T. thailandensis nauplii are characterized by the following: a smaller body size throughout the naupliar phase; first antennular segment without seta, second antennular segment with only one small seta plus two longer setae; third antennular segment with additional spinules from naupliar stage II onwards; antenna bears three small spinules on the terminal exopodal segment; one additional seta on the anterior surface of the antennary basis, tubular endopod of antenna with one tiny seta midlength at naupliar stage III that increases in size; mandibular basis with several spinules on anterior surface; mandibular coxa with one spinulose seta that is smooth in T. japonicus.

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“…Probably, some species with wide distribution areas will turn out to be a series of twin species. For example, karyological analysis and intercrossing of populations of the "cosmopolitan" harpacticoid Tigriopus californicus have resulted in the description of two twin species (Soyer et al, 1987). On the other hand, the description of narrow-endemic species could turn out to be a consequence of the underestimation of intraspecific variability which practically has not been studied for meiobenthic organisms.…”

Section: Discussionmentioning

confidence: 99%

Harpacticoida (Crustacea: Copepoda) of the South China Sea: faunistic and biogeographical analysis

2010

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Based on original and on published databases, a compendium of the Harpacticoida of the South China Sea is presented, and the distributional range of species is discussed. Up to now, a total of 77 harpacticoid species belonging to 57 genera and 19 families have been recorded in this region. Twenty of these species, collected in Nha Trang Bay (Vietnam), have not hitherto been described. The most speciose families are the Miraciidae (20 species) and the Laophontidae (9 species). Thirteen families were represented by one to three species only and six families by four to seven species. A brief comparison is presented between the harpacticoid fauna of the South China Sea, the Philippine Islands, the inner Malayan Archipelago (Java, Flores, Banda and Celebes Seas), New Guinea, the Yellow Sea and the Andaman and Nicobar Islands. The overall similarity between the species lists of these areas was observed to be extremely low (average value of Simpson index is 0.15 ± 0.08). The lists of planktonic species from the different areas showed the highest similarity. The lowest similarity (highest endemism) was observed between the lists of interstitial species. It is likely that one of the factors determining the differences between the faunas is the poor knowledge about the composition and distribution of benthic harpacticoids in tropical latitudes.3

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Description de deux espéces jumelles du groupe Tigriopus angulatus (Copepoda, Harpacticoida) dans les archipels Crozet et Kerguelen (Terres Australes et Antarctiques Frangaises)

Cited by 21 publications

References 9 publications

Environmental Tolerances of Three Species of The Harpacticoid Copepod GenusTigriopus

Environmental Tolerances of Three Species of The Harpacticoid Copepod GenusTigriopus

A new species of Tigriopus (Copepoda, Harpacticoida, Harpacticidae) from Thailand with the description of its naupliar development

Harpacticoida (Crustacea: Copepoda) of the South China Sea: faunistic and biogeographical analysis

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