• Title/Summary/Keyword: morphometrics

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Covariance patterns between ramus morphology and the rest of the face: A geometric morphometric study

  • Marietta Krusi;Demetrios J. Halazonetis;Theodore Eliades;Vasiliki Koretsi
    • The korean journal of orthodontics
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    • v.53 no.3
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    • pp.185-193
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    • 2023
  • Objective: The growth and development of the mandible strongly depend on modeling changes occurring at its ramus. Here, we investigated covariance patterns between the morphology of the ramus and the rest of the face. Methods: Lateral cephalograms of 159 adults (55 males and 104 females) with no history of orthodontic treatment were collected. Geometric morphometrics with sliding semi-landmarks was used. The covariance between the ramus and face was investigated using a two-block partial least squares analysis (PLS). Sexual dimorphism and allometry were also assessed. Results: Differences in the divergence of the face and anteroposterior relationship of the jaws accounted for 24.1% and 21.6% of shape variation in the sample, respectively. Shape variation was greater in the sagittal plane for males than for females (30.7% vs. 17.4%), whereas variation in the vertical plane was similar for both sexes (23.7% for males and 25.4% for females). Size-related allometric differences between the sexes accounted for the shape variation to a maximum of 6% regarding the face. Regarding the covariation between the shapes of the ramus and the rest of the face, wider and shorter rami were associated with a decreased lower anterior facial height as well as a prognathic mandible and maxilla (PLS 1, 45.5% of the covariance). Additionally, a more posteriorly inclined ramus in the lower region was correlated with a Class II pattern and flat mandibular plane. Conclusions: The width, height, and inclination of the ramus were correlated with facial shape changes in the vertical and sagittal planes.

Electron-Morphometric Classification of the Native Honeybees from Korea. Part III. Discriminant Analysis for Different Localities Based on the Total Characters (한국산 재래꿀벌의 전자계량형태학적 분류. III. 전 47형질에 대한 각 지역간 판정분석)

  • 권용정;허은엽
    • Korean journal of applied entomology
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    • v.32 no.1
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    • pp.42-50
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    • 1993
  • Some multivariate discriminant analyses were done for each population of the native honeybee workers (Apis cerana), which were selected for 11 different localities in spring and 12 in summer from Korea. When the comparison for different localities was conducted, the correct assignment was averaged at 91.67% in spring and 88.44% in summer. And for the comparison between the 2 different seasons, it was averaged at 97.58%. Whereas, that regardless of seasons revealed the lowest correct assignment at 70.16%.

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Electron-Morphometric Classification of the Native Honeybees from Korea. Part II. Discriminant Analysis for Different Populations Based on the Total Characters (한국산 재래꿀벌의 전자계량형태학적 분류. II. 전 47형질에 대한 각 지역개체군간 판정분석)

  • 권용정;허은엽
    • Korean journal of applied entomology
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    • v.32 no.1
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    • pp.30-41
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    • 1993
  • In the present investigation, some multivariate discriminant analyses were done for each population of the native honeybee workers (Apis cerana), which were selected for 15 different localities in spring and 16 in summer form Korea. when the comparison of both seasons for different populations and regardless of seasons were conducted, all the classification results revealed that the differences were significantly prominent. And the length of fore tibia(FTL) was the best contributed character among the 47 morphometric characters used in the analysis.

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Morphometric Variations of a Populations of the Whitebacked Planthopper, Sogatella furcifera Horv th (Homoptera : Delphacidae), from Korea, China, and the Philippines (한국, 중국, 필리핀산 흰등멸구의 계량형태적 변이)

  • ;R.C. Saxena;A.A. Barrion;G.R. Wu
    • Korean journal of applied entomology
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    • v.31 no.1
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    • pp.37-44
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    • 1992
  • Morphometrics of the sensory appendages for host plant discrimination such as antenna, leg, rostrum of S. furcifera sampled from Korea, China, and Philippines were determined and compared. Computed discriminant scores of 89 characters produced scatter diagrams and group centroids revealing discrete segregations of the three populations.

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Further observations on the genetics and morphometrics of Coolia santacroce (Dinophyceae)

  • Karafas, Sarah J.;Tomas, Carmelo R.
    • ALGAE
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    • v.30 no.4
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    • pp.275-280
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    • 2015
  • Coolia santacroce is a newly described epibenthic dinoflagellate species collected from the U.S. Virgin Islands. The original description indicates this species is unique from others in the Coolia monotis complex due to the relative size of the apical pore complex, broad range of pore sizes, and ribosomal DNA. The original description was done based on the isolation and cultivation of one isolate of the organism. In this study, we report three more isolates of Coolia santacroce collected from the Bahamas. Morphological observations were made using scanning electron microscopy that do not correspond to those from the original description, indicating the variability of the morphological features. However, analysis of the D1 / D2 regions of the large subunit rDNA places the three strains in a strongly supported monophyletic clade with the type specimen.

Morphometric Classification of the Subgenus Parapagaronia from Korea (Homoptera: Cicadellidae) (가시황백매미충아속의 계량형태학적 분류(매미목: 매미충과))

  • 허은엽;권용정
    • Korean journal of applied entomology
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    • v.35 no.1
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    • pp.7-14
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    • 1996
  • A morphometric analysis is used to clarify the interspecific relationship between 4 species of the subgenus Parapagaronia in Pagaronia. The quantitative distinctions are confirmed at 87.5% of correct assignment in male and 96.25% in female.

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Systematic Studies of Korean Rodents : II. A Chromosome Analysis in Korean Field Mice, Apodemus peninsulae peninsulae Thomas (Muridae, Rodentia), From Mungyong, with the Comparison of Morphometric Characters of these Korean Field Mice to Symptric Striped Field Mice, A. agrarius coreaee Thomas (한국산 설치류의 계통분류학적 연구 : II. 문경산 흰 넓적다리 붉은쥐, Apodemus peninsulae peninsulae Thomas, 의 염색체 분석 및 문경산 등줄쥐, odemus Apagrarius coreae 와의 형태적 형질의 비교분석)

  • 고흥선
    • Animal Systematics, Evolution and Diversity
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    • v.2 no.1
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    • pp.1-10
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    • 1986
  • 문경산 흰 넓적다리 붉은 쥐, Apodemus peninsulae peninsulae, 의 염색체 핵형 분석과 단변량 및 다변량분석방법들을 사용한 등줄쥐, Apodemus agrarius coreae, 와의 형태적 형질의 비교를 하였다. 흰 넓적다리 붉은 쥐의 염색체수는 2n=50-54R지 수적 변이를 보였다. 차단부 염색체의 수는 48개로 개체간에 일정하였으나 , 중부 염색체의 수는 2-6개의 변이가 나타났다. 형태적 형질의 분석결과는 등줄쥐보다 흰 넓적다리 붉은 쥐가 크다고 판정되었으며 가장 구별이 잘 되는 경구개의 길이였다.

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First Report of Two Cephalobidae Species (Nematoda: Cephalobomorpha) in South Korea

  • Kim, Taeho;Kim, Jiyeon;Park, Joong-Ki
    • Animal Systematics, Evolution and Diversity
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    • v.34 no.4
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    • pp.181-189
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    • 2018
  • Cephalobus aff. quinilineatus (Shavrov, 1968) Anderson and Hooper, 1970 and Eucephalobus hooperi MarinariPalmisano, 1967 from the family Cephalobidae Filipjev, 1934 (Cephalobomorpha) are newly reported from South Korea. Cephalobus aff. quinilineatus is distinguished from other Cephalobus species by its high and rounded labial probolae and five lateral incisures, with three incisures extending to the tail terminus. Eucephalobus hooperi is distinguished from other Eucephalobus species by its three bifurcated labial probolae with pointed termini and by morphometric characters such as body and tail length and the corpus:isthmus ratio. In this study, the morphological characters and morphometrics of C. aff. quinilineatus and E. hooperi Korean population are described and illustrated based on optical and/or scanning electron microscopy.

Prionchulus oleksandri (Nematoda: Mononchida) from Korea

  • Kim, Jiyeon;Kim, Taeho;Ryu, Shi Hyun;Park, Joong-Ki
    • Animal Systematics, Evolution and Diversity
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    • v.34 no.4
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    • pp.194-198
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    • 2018
  • The genus Prionchulus Cobb, 1916 represents a group of predaceous nematodes belonging to the family Mononchidae Chitwood, 1937, and is found worldwide. However, only five species have been reported thus far from Korea. Prionchulus oleksandri Winiszewska and Susulovsky, 2003 is reported for the first time from Korea, from sediments collected from the Nakdong River. This species is distinguished from other Prionchulus species by its truncated lip region with small cephalic papillae and refringens vaginae. In this study, morphological characters(detailed morphometrics) of P. oleksandri are described and illustrated using optical microscopy. DNA barcode sequence information (the D2-D3 region of 28S rDNA, 18S rDNA, and internal transcribed spacer rDNA) is also provided for the molecular identification of the species.

Two New Species of Myrmica (Hymenoptera, Formicidae) from Korea

  • Elmes, Graham W.;Radchenkoo, Alexander G.;Kim, Byung-Jin
    • Animal cells and systems
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    • v.5 no.2
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    • pp.107-112
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    • 2001
  • Two new species of Myrmica from Korea are described. M. koreana belongs to the schencki species-group of Myrmica and is most similar to M. schencki. It is possibly endemic to the Korean Peninsula. M. hyungokae belongs to the lobicornis-group and is most similar to M. jessensis. It has some characters normally associated with social parasites but it is probably a free-living species. Both new species were clearly separated from their nearest relatives on subjective characters (shape, sculpture etc.) and this was confirmed by discriminant analysis of the morphometrics.

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