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First descriptions of copepodid stages, sexual dimorphism and intraspecific variability of Mesocletodes Sars, 1909 (Copepoda, Harpacticoida, Argestidae), including the description of a new species with broad abyssal distribution.

Menzel L - Zookeys (2011)

Bottom Line: Some modifications allow sexing of copepodid stages.P1-P4 are fully developed in CV.Mesocletodes faroerensis and Mesocletodes thielei lack apomorphies of Mesocletodes and are excluded.

View Article: PubMed Central - PubMed

Affiliation: Senckenberg am Meer Wilhelmshaven, Abt. DZMB, Südstrand 44, D- 26382 Wilhelmshaven, Germany.

ABSTRACT
Mesocletodes Sars, 1909a encompasses 37 species to date. Initial evidence on intraspecific variability and sexual dimorphism has been verified for 77 specimens of Mesocletodes elmari sp. n. from various deep-sea regions, and ontogenetic development has been traced for the first time. Apomorphies are a strong spinule-like pinna on the mx seta that is fused to the basis, P2-P4 exp3 proximal outer seta lost, P1-P4 enp2 extremely elongated, furcal rami elongated, female body of prickly appearance, female P2-P4 enp2 proximal inner seta lost. Intraspecific variability involves spinulation, ornamentation and size of the body and setation and spinulation of pereiopods. Sexually dimorphic modifications of adult females include prickly appearance of the body, P1 enp exceeds exp in length, P1 coxa externally broadened, seta of basis arising from prominent protrusion, hyaline frills of body somites ornate. Sexual dimorphism in adult males is expressed in smaller body size, haplocer A1, 2 inner setae on P2-P4 enp2 and on P5 exp, P5 basendopodal lobe with 2 setae. Some modifications allow sexing of copepodid stages. The female A1 is fully developed in CV, the male A1 undergoes extensive modifications at the last molt. P1-P4 are fully developed in CV. Mesocletodes faroerensis and Mesocletodes thielei lack apomorphies of Mesocletodes and are excluded.

No MeSH data available.


Related in: MedlinePlus

Positions of the sampled stations containing the species studied. 1 NODINAUT 2 ANDEEP 3 CROZEX 4 DIVA 5 GMB 6 PAP.
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Figure 1: Positions of the sampled stations containing the species studied. 1 NODINAUT 2 ANDEEP 3 CROZEX 4 DIVA 5 GMB 6 PAP.

Mentions: Expeditions to the Southeast Atlantic (DIVA-1 [Balzer et al. 2006], DIVA-2 [Türkay and Pätzold 2009] and part of ANDEEP III [Fahrbach 2006]), the Southern Ocean (ANDEEP I and II [Fütterer et al. 2003]), the South Indian Ocean (CROZEX [Pollard and Sanders 2006]), the central Pacific (NODINAUT [Galéron and Fabri 2004], the North Atlantic (Porcupine Abyssal Plain, PAP [see Kalogeropoulou et al. 2010 for summary] and the Great Meteor Bank [Pfannkuche et al. 2000]) (Fig. 1) provided numerous specimens of the genus Mesocletodes Sars, 1909a. Belonging to the family of Argestidae Por, 1986a, Mesocletodes is considered to be a typical and primarily deep-water dwelling taxon (compare overview in George 2004 and George 2008). The total number of Mesocletodes in deep-sea samples amounts to almost 50% of all Argestidae Por, which in turn form one of the most abundant taxa of harpacticoid copepods therein. Due to the high frequency in deep-sea samples and conspicuous morphological characters, Mesocletodes is informative for chorological, faunistic and biogeographic research. The number of specimens as well as species diversity are substantial, but species are well discernible.


First descriptions of copepodid stages, sexual dimorphism and intraspecific variability of Mesocletodes Sars, 1909 (Copepoda, Harpacticoida, Argestidae), including the description of a new species with broad abyssal distribution.

Menzel L - Zookeys (2011)

Positions of the sampled stations containing the species studied. 1 NODINAUT 2 ANDEEP 3 CROZEX 4 DIVA 5 GMB 6 PAP.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3095135&req=5

Figure 1: Positions of the sampled stations containing the species studied. 1 NODINAUT 2 ANDEEP 3 CROZEX 4 DIVA 5 GMB 6 PAP.
Mentions: Expeditions to the Southeast Atlantic (DIVA-1 [Balzer et al. 2006], DIVA-2 [Türkay and Pätzold 2009] and part of ANDEEP III [Fahrbach 2006]), the Southern Ocean (ANDEEP I and II [Fütterer et al. 2003]), the South Indian Ocean (CROZEX [Pollard and Sanders 2006]), the central Pacific (NODINAUT [Galéron and Fabri 2004], the North Atlantic (Porcupine Abyssal Plain, PAP [see Kalogeropoulou et al. 2010 for summary] and the Great Meteor Bank [Pfannkuche et al. 2000]) (Fig. 1) provided numerous specimens of the genus Mesocletodes Sars, 1909a. Belonging to the family of Argestidae Por, 1986a, Mesocletodes is considered to be a typical and primarily deep-water dwelling taxon (compare overview in George 2004 and George 2008). The total number of Mesocletodes in deep-sea samples amounts to almost 50% of all Argestidae Por, which in turn form one of the most abundant taxa of harpacticoid copepods therein. Due to the high frequency in deep-sea samples and conspicuous morphological characters, Mesocletodes is informative for chorological, faunistic and biogeographic research. The number of specimens as well as species diversity are substantial, but species are well discernible.

Bottom Line: Some modifications allow sexing of copepodid stages.P1-P4 are fully developed in CV.Mesocletodes faroerensis and Mesocletodes thielei lack apomorphies of Mesocletodes and are excluded.

View Article: PubMed Central - PubMed

Affiliation: Senckenberg am Meer Wilhelmshaven, Abt. DZMB, Südstrand 44, D- 26382 Wilhelmshaven, Germany.

ABSTRACT
Mesocletodes Sars, 1909a encompasses 37 species to date. Initial evidence on intraspecific variability and sexual dimorphism has been verified for 77 specimens of Mesocletodes elmari sp. n. from various deep-sea regions, and ontogenetic development has been traced for the first time. Apomorphies are a strong spinule-like pinna on the mx seta that is fused to the basis, P2-P4 exp3 proximal outer seta lost, P1-P4 enp2 extremely elongated, furcal rami elongated, female body of prickly appearance, female P2-P4 enp2 proximal inner seta lost. Intraspecific variability involves spinulation, ornamentation and size of the body and setation and spinulation of pereiopods. Sexually dimorphic modifications of adult females include prickly appearance of the body, P1 enp exceeds exp in length, P1 coxa externally broadened, seta of basis arising from prominent protrusion, hyaline frills of body somites ornate. Sexual dimorphism in adult males is expressed in smaller body size, haplocer A1, 2 inner setae on P2-P4 enp2 and on P5 exp, P5 basendopodal lobe with 2 setae. Some modifications allow sexing of copepodid stages. The female A1 is fully developed in CV, the male A1 undergoes extensive modifications at the last molt. P1-P4 are fully developed in CV. Mesocletodes faroerensis and Mesocletodes thielei lack apomorphies of Mesocletodes and are excluded.

No MeSH data available.


Related in: MedlinePlus