Cybaeus hatsushibai n. sp. (Araneae: Cybaeidae) from Mt. Odaigahara, Honshu, Japan, with notes on geographic distribution and body size of its closely related species.

2005 ◽  
Vol 54 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Yoh Ihara
Keyword(s):  
Body Size ◽  
Geographic Distribution ◽  
Related Species ◽  
Closely Related Species

Reproductive performance in a phyletic dwarf, the spider crab Petramithrax pygmaeus (Bell, 1836) (Decapoda: Brachyura: Mithracidae)

2020 ◽  
Vol 40 (3) ◽  
pp. 325-329
Author(s):  
Joshua T Fields ◽  
Hayden K Mullen ◽  
Clayr M Kroenke ◽  
Kyla A Salomon ◽  
Abby J Craft ◽  
...  
Keyword(s):  
Body Size ◽  
Reproductive Performance ◽  
Related Species ◽  
Egg Production ◽  
Marine Invertebrates ◽  
Small Body ◽  
Reproductive Investment ◽  
Spider Crab ◽  
Closely Related Species ◽  
Body Sizes

Abstract The spider crab Petramithrax pygmaeus (Bell, 1836), a phyletic dwarf, was used to test predictions regarding reproductive performance in small marine invertebrates. Considering the disproportional increase in brooding costs and the allometry of egg production with increasing body size, it was expected that this minute-size species would produce large broods compared to closely related species that attain much larger body sizes. Fecundity in P. pygmaeus females carrying early and late eggs varied, respectively, between 17 and 172 eggs crab–1 (mean ± SD = 87.97 ± 48.39) and between 13 and 159 eggs crab–1 (55.04 ± 40.29). Females did not experience brood loss during egg development. Egg volume in females carrying early and late eggs varied, respectively, between 0.13 and 0.40 mm3 (0.22 ± 0.07) and between 0.15 and 0.42 mm3 (0.26 ± 0.06 mm3). Reproductive output (RO) varied between 0.91 and 8.73% (3.81 ± 2.17%) of female dry body weight. The RO of P. pygmaeus was lower than that reported for closely related species with larger body sizes. The slope (b = 0.95 ± 0.15) of the line describing the relationship between brood and parental female dry weight was not statistically significant from unity. Overall, our results disagree with the notion that the allometry of gamete production and increased physiological costs with increased brood size explain the association between brooding and small body size in marine invertebrates. Comparative studies on the reproductive investment of brooding species belonging to monophyletic clades with extensive differences in body size are warranted to further our understanding about disparity in egg production in brooding marine invertebrates.

Designation of a neotype for the Brazilian porcupine, Coendou prehensilis (Linnaeus, 1758)

Zootaxa ◽  
2011 ◽  
Vol 2791 (1) ◽  
pp. 30 ◽  
Author(s):  
YURI L. R. LEITE ◽  
VILACIO CALDARA JÚNIOR ◽  
ANA CAROLINA LOSS ◽  
LEONORA PIRES COSTA ◽  
ÉVERTON R. A. MELO ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Geographic Distribution ◽  
Related Species ◽  
Taxonomic Revision ◽  
Type Specimen ◽  
Northeastern Brazil ◽  
Closely Related Species ◽  
Geographic Ranges ◽  
Central Brazil ◽  
Shed Light

The Brazilian porcupine was one of several species described and illustrated by the 17 th -century naturalist Georg Marcgrave, whose text was among the primary references upon which Linnaeus based his Hystrix prehensilis. As currently understood, Coendou prehensilis is a wide-ranging polytypic taxon that has never been revised and may represent a complex of closely related species. Given that no name-bearing type specimen of C. prehensilis is believed to be extant, and in order to avoid ambiguous application of this name, we designate a specimen collected at the type locality in Pernambuco, northeastern Brazil, as the neotype for Hystrix prehensilis Linnaeus. The geographic distribution of mitochondrial DNA haplotypes suggests that specimens from west-central Brazil previously identified as “Coendou prehensilis” belong to a different species, but only a comprehensive taxonomic revision of the genus will shed light on species limits and the geographic ranges of C. prehensilis and other congeneric forms.

First record of Polyneura bonnemaisonii (Delesseriaceae, Rhodophyta) from the Atlantic Ocean of Africa

2015 ◽  
Vol 8 ◽  
Author(s):  
Mustapha Hassoun ◽  
Hanaa Moussa ◽  
Hanaa Zbakh ◽  
Hassane Riadi ◽  
Mohamed Kazzaz ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Geographic Distribution ◽  
Related Species ◽  
Algal Species ◽  
First Record ◽  
Closely Related Species ◽  
North West ◽  
Red Algal ◽  
First Time

A red algal species,Polyneura bonnemaisonii(Delesseriaceae, Rhodophyta), is described for the first time in the Atlantic Ocean of Morocco. This is also the first reference of the occurrence of this species in Africa. This species was collected in the lower intertidal to subtidal zones, from Hyayda (north-west of Morocco). The Moroccan specimen is studied in detail and compared with other closely related species. Habitat, geographic distribution, description and illustration of the macroscopic and microscopic characters are presented and discussed in this work.

Similar nucleus numbers among copepods

1983 ◽  
Vol 61 (4) ◽  
pp. 721-724 ◽  
Author(s):  
I. A. McLaren ◽  
D. J. Marcogliese
Keyword(s):  
Body Size ◽  
Related Species ◽  
Calanus Finmarchicus ◽  
Close Correspondence ◽  
Nucleus Size ◽  
Closely Related Species ◽  
Acartia Hudsonica ◽  
Eurytemora Herdmani

First nauplius stages (NI) of Pseudocalanus sp., Eurytemora herdmani, Calanus finmarchicus, and C. hyperboreas all have on average about 2000 nuclei. First copepodid stages (CI) of Acartia hudsonica, Pseudocalanus sp., E. herdmani, C. finmarchicus and C. glacialis have about 9600–13 000 nuclei. Body volumes among the same species differ ca. 8-fold in NI and 30-fold in CI. Larger species have much larger nuclei, but close correspondence of body size to nucleus size (amount of DNA) may only occur among closely related species. Nucleocytoplasmic ratios must also vary seasonally within species.

The Presence of Ridgewayia Marki Minorcaensis N. Ssp. in the Western Mediterranean

Crustaceana ◽  
1996 ◽  
Vol 69 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Marta Carola ◽  
Claude Razouls
Keyword(s):  
Geographic Distribution ◽  
Related Species ◽  
Western Mediterranean ◽  
The Bahamas ◽  
Closely Related Species ◽  
Mediterranean Populations ◽  
New Subspecies ◽  
The Right

AbstractFifteen specimens of Ridgewayia marki minorcaensis n. ssp., collected from Calan Porter Cave, Minorca (western Mediterranean) on 18 July, 1988, are compared with closely related species. The presence of a hitherto undescribed structure on the basis of the right fifth leg of the male justifies establishing a new subspecies. This is the second record of this species, next to that from the Bermuda islands, and thus represents an interesting geographic distribution. The presence, in the same cave, of Exumella polyarthra Fosshagen, 1970, until now found only in the Bahamas, might pose the hypothesis of a relict character of these Mediterranean populations.

Do Closely Related Species Influence Each Other's Sexual Size Dimorphism?

2018 ◽  
Author(s):  
Chloe Boynton
Keyword(s):  
Body Size ◽  
Related Species ◽  
Species Interactions ◽  
Sexual Size Dimorphism ◽  
Birds Of Prey ◽  
Closely Related Species ◽  
Size Dimorphism ◽  
Group I ◽  
Males And Females ◽  
Range Overlap

Size differences between males and females (sexual size dimorphism) are often seen in a variety of species. In birds of prey in particular, a phenomenon occurs where the female is larger than the male. One of the main hypotheses attempting to explain sexual size dimorphism in birds of prey is that the female and male differ in size to partition resources, like prey. There is also evidence that predator and prey body size are correlated, so predators of similar size may be in direct competition. It has been shown that when two closely related species interact in the same area, they are likely to be in competition for similar resources, like prey. This study is looking at sexual size dimorphism and closely related species interactions, which has never been looked at before in birds of prey. I am using the subfamily Buteoninae (Buteo Hawks) as my focal group. I will be using sexual size dimorphism ratios, estimates of genetic distance between closely related species and proportion of range overlap between different closely related lineages within the subfamily. I am expecting to see that if species are closely related and inhabit the same area they will have a decreased sexual size dimorphism. This is because both species are likely to be competing for the same resources, and to avoid competition the species will diverge in body size from one another. This will cause the male and female of each species to converge in size, reducing their sexual size dimorphism.

Sur le groupe de Flabellipecten flabelliformis; signification du terme "groupe"

1943 ◽  
Vol S5-XIII (4-6) ◽  
pp. 181-192
Author(s):  
Jean Roger
Keyword(s):  
Geographic Distribution ◽  
Related Species ◽  
Closely Related Species

Abstract Describes Flabellipecten arambourgi n.sp. from Pliocene deposits of Oran, Algeria, and discusses its affinities with members of the F. flabelliformis group, to which it is assigned. Criteria for erecting and defining groups are also discussed, and it is concluded that similarities of morphology and stratigraphic and geographic distribution of closely related species warrant the establishment of groups.

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