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The embryonic development of the centipede Strigamia maritima
1Laboratory for Development and Evolution, Department of Zoology, University of Cambridge, UK. cb508@cam.ac.uk
Developmental Biology
|December 6, 2011
Summary
This study details the embryonic development of the geophilomorph centipede Strigamia maritima, revealing prolonged early stages and a distinct segment addition pattern. It establishes a staging system for myriapod development research.
Area of Science:
- Developmental Biology
- Evolutionary Biology
- Myriapodology
Background:
- Strigamia maritima is an emerging model organism for myriapod development and evolution.
- A draft genome sequence is available, facilitating comparative genomics and physiological studies.
- Modern techniques are applied to detail myriapod embryonic development for the first time.
Purpose of the Study:
- To provide the first detailed description of myriapod embryonic development using modern techniques.
- To establish a detailed staging system for Strigamia maritima development.
- To characterize the timeline and key events of embryonic development, including cleavage, blastoderm formation, segmentogenesis, and germ band flexure.
Main Methods:
- Detailed staging system based on live egg and fixed embryo photography.
- Observation of embryonic development at 13 °C.
- Analysis of cleavage, nuclear migration, blastoderm formation, segment addition rates, germ band flexure, and organogenesis.
Main Results:
- Early cleavage and nuclear migration stages are prolonged, lasting approximately 22 of 48 days.
- Cleavage cells migrate to the periphery to form a uniform blastoderm.
- Segment addition occurs in distinct phases: rapid addition of 35 segments, followed by slower addition, with a total of 40-45 leg-bearing segments formed before flexure.
- Germ band flexure is followed by morphogenesis and organogenesis, with the final segment number (47-49) achieved at hatching.
Conclusions:
- The study provides a comprehensive staging system and timeline for Strigamia maritima embryonic development.
- Prolonged early stages and distinct phases of segment addition characterize myriapod development in this species.
- This work serves as a foundational reference for future studies in myriapod developmental biology and evolution.
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