- ContentsContents
- Article InfoArticle Info
- CiteCite
- MetricsMetrics
- CommentComment
- RelatedRelated
- FigsFigs
- TabsTabs
- MapMap
- TaxaTaxa
- RefsRefs
- CitedCited
- Inst. CodeInst. Code
- NanopubsNanopubs
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381877/singlefigmini/file.jpg)
Sampling locations for Octomeris intermedia (black circles) and Octomeris brunnea (black squares). Open circle indicates the sampling location of O. intermedia in the Mergui Archipelago stated in
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381878/singlefigmini/file.jpg)
A Krabi, Thailand, showing O. intermedia at the overhang of an intertidal cave (indicated by white arrow). B Hey or Coral Island, Phuket, showing that O. intermedia occur on shaded rocks. C O. intermedia can occupy up to 100% cover under a shaded rock in Thailand. D Octomeris intermedia, showing partially eroded samples, with longitudinal furrows at the base of the shell plates. E O. intermedia, eroded samples, showing shell with a smooth surface. F O. intermedia, uneroded samples, showing longitudinal furrows on the surface. G O. brunnea on Lanyu, Taiwan. Shell is more conical than O. intermedia. Eroded sample with smooth shell plates.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381879/singlefigmini/file.jpg)
Shape of the tergo-scutal junction (TS junction, indicated by arrows) of Octomeris brunnea (CEL-KT-131, Hai Kou, Taiwan) and O. intermedia (CEL-Thai-359, Krabi, Thailand) All specimens share the same scale bar.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381880/singlefigmini/file.jpg)
Octomeris brunnea (CEL-KT-131, Hai Kou, Taiwan) and O. intermedia (CEL-Thai-359, Krabi, Thailand). A Octomeris brunnea, young specimens showing the straight tergo-scutal junction and the inner and outer sides of left scutum and tergum. B O. brunnea, older eroded specimen, showing the sinuous tergo-scutal junction and inner and outer sides of left scutum and tergum. C O. intermedia. Very small individual (shell length < 10 mm) showing the straight tergo-scutal margin and inner and outer sides of scutum and tergum. Note only very small individuals of O. intermedia have straight tergo-scutal margin. D O. intermedia. Larger specimens, showing the sinuous tergo-scutal margin and inner and outer surfaces of scutum and tergum. Scale bars in mm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381881/singlefigmini/file.jpg)
Octomeris brunnea (CEL-KT-131, Hai Kou, Taiwan). A Cirrus I. B Posterior ramus of cirrus I. C Bidentate serrate setae at tip of segment. D Bidentate serrate setae at tip of anterior ramus. E Cirrus II. F Dorsal side of posterior ramus. G, H Bidentate serrate setae at posterior ramus. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381882/singlefigmini/file.jpg)
Octomeris brunnea (CEL-KT-131, Hai Kou, Taiwan). A Cirrus III. B Intermediate segments of posterior ramus of cirrus III. C Distal segments of anterior ramus of cirrus III. D. Simple type setae on anterior ramus of cirrus III. E Cirrus IV. F Intermediate segments of cirrus IV. G Dorsal surface of proximal segment of posterior ramus of cirrus IV. H Distal segments of anterior ramus of cirrus IV. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381883/singlefigmini/file.jpg)
Octomeris brunnea (CEL-KT-131, Hai Kou, Taiwan). A Cirrus V. B Intermediate segments of posterior ramus of cirrus V. C Distal segments of anterior ramus of cirrus V. D Cirrus VI. E Intermediate segments of posterior ramus of cirrus VI. F Dorsal surface of proximal segments of posterior ramus of cirrus VI. G Penis. H Distal end of penis. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381884/singlefigmini/file.jpg)
Octomeris brunnea (CEL-KT-131, Hai Kou, Taiwan). A Maxilla. B Magnified view of distal lobe showing serrulate setae. C Inner margin of proximal lobe of maxilla showing serrulate setae. D Outer margin of maxilla showing serrulate setae. E Maxillule; note the two deep notches on upper and lower 1/3 of the cutting edge. F Cutting edge above upper notch. G Middle portion of cutting edge. H Lower portion of cutting edge below lower notch. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381885/singlefigmini/file.jpg)
Octomeris brunnea. A Mandible. B First tooth of mandible. C Second and third teeth of mandible. D Lower margin. E Mandibular palp. F Serrulate setae at outer margin of mandibular palp. G Labrum. H Small teeth on middle part of cutting edge of labrum. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381886/singlefigmini/file.jpg)
Octomeris intermedia (CEL-Thai-359, Krabi, Thailand). A Cirrus I. B Posterior ramus of cirrus I. C Bidentate serrate setae at tip of distal segment of posterior ramus. D Bidentate serrate setae at tip of anterior ramus. E Cirrus II. F Dorsal side of posterior ramus. G, H Bidentate serrate setae at posterior ramus. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381887/singlefigmini/file.jpg)
Octomeris intermedia (CEL-Thai-359, Krabi, Thailand). A Cirrus III. B Intermediate segments of posterior ramus of cirrus III. C Distal segment of anterior ramus of cirrus III. D Simple setae at intermediate segments of anterior ramus of cirrus III. E Cirrus IV. F Intermediate segments of posterior ramus cirrus IV. G Intermediate segment of posterior ramus of cirrus IV. H distal segment of anterior ramus of cirrus IV. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381888/singlefigmini/file.jpg)
Octomeris intermedia (CEL-Thai-359, Krabi, Thailand). A Cirrus V. B Intermediate segments of posterior ramus of cirrus V. C Distal segments of anterior ramus of cirrus V. D Cirrus VI. E Intermediate segments of posterior ramus of cirrus VI. F Distal segment of anterior ramus of cirrus VI. G Penis. H Distal end of penis. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381889/singlefigmini/file.jpg)
Octomeris intermedia (CEL-Thai-359, Krabi, Thailand). A Maxilla. B Magnified view of distal lobe showing serrulate setae. C Inner margin of maxilla showing serrulate setae. D Outer margin of maxilla showing serrulate setae. E Maxillule; note the two shallow notches on upper and lower 1/3 of the cutting edge. F Cutting edge above upper notch. G Middle portion of cutting edge. H Lower portion of cutting edge. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381890/singlefigmini/file.jpg)
Octomeris intermedia (CEL-Thai-359, Krabi, Thailand). A Mandible, whole view B First and second teeth of mandible. C Second and third teeth of mandible of another specimen. D Lower margin of mandible. E Distal part of mandibular palp. F Serrulate setae at distal margin of mandibular palp. G Labrum. H Cutting edge of labrum, middle part. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381891/singlefigmini/file.jpg)
Variation in the occurrence of small spines along the cutting edge of second and third teeth of mandibles in O. intermedia (A-C) (CEL-Thai-359, Krabi, Thailand) and O. brunnea (D-F) (CEL-KT-131, Hai Kou, Taiwan). Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381892/singlefigmini/file.jpg)
Consistent differences in the presences of shallow and deep notches on the cutting edge of O. intermedia (A-C) CEL-Thai-359, Krabi, Thailand) and O. brunnea (D-F) (CEL-KT-131, Hai Kou, Taiwan), respectively. The notches in O. brunnea are much deeper, and three distinct regions can be seen along the cutting edge. Scale bars in μm.
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381893/singlefigmini/file.jpg)
The neighbor-joining trees reconstructed with COI A and 12S rRNA B by MEGA X. Bootstrap values above 90 are represented at the nodes. “*” indicates the sequences from
![Download image](https://arpha.pensoft.net//i/download-icon-30.png)
![](https://binary.pensoft.net/fig/381894/singlefigmini/file.jpg)
Maximum likelihood (ML) phylogenetic tree based on the COI and 12S rRNA sequences. The SH-aLRT support, ultrafast bootstrap support, and posterior probability (%) above 80 are represented at the nodes.