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Embryonic staging series for the African House Snake ( Lamprophis fuliginosus) using external morphology PowerPoint Presentation
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Embryonic staging series for the African House Snake ( Lamprophis fuliginosus) using external morphology - PowerPoint PPT Presentation


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Embryonic staging series for the African House Snake ( Lamprophis fuliginosus) using external morphology. Eric Dichter and Scott Boback. Department of Biology, Dickinson College, Carlisle, PA. Outline. The motivation The question African House staging series Continuing work

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Embryonic staging series for the African House Snake (Lamprophis fuliginosus) using external morphology

Eric Dichter and Scott Boback. Department of Biology, Dickinson College, Carlisle, PA.

outline
Outline
  • The motivation
  • The question
  • African House staging series
  • Continuing work
  • Goals for future
african house snake staging series
African House Snake staging series
  • oviparous
  • smaller size
  • shorter time of development
  • docile
  • VERY prolific reproduction
staging criteria for rock python
Staging criteria for Rock Python

Adapted from Boughner et al. 2007

staging criteria for african house
Staging criteria for African House
  • Mandibular length (relative to maxilla)
  • Brain development
  • Location of organs
  • Angle of cervical flexure
  • Weight
  • Length
  • Eye pigment
  • Scales

Adapted from Boughner et al. 2007

0 1 days
0-1 days

Visible, protruding mesencephalon

Mandible

External organs

6 days
6 days

Visible, protruding mesencephalon

Mandible

External organs

9 days
9 days

Visible, protruding mesencephalon

Mandible

External organs

13 days
13 days

Visible, protruding mesencephalon

Mandible

External heart

16 days
16 days

Visible, protruding mesencephalon

Mandible

Internalized heart (moved caudally)

13 days1
13’ days

Visible, protruding mesencephalon

Mandible

Scales forming

16 days1
16’ days

Visible, flattening mesencephalon

Mandible

27 days
27 days

Visible, linearized skull

Pigmentation pattern beginning

34 days
34 days

Opaque, elongate skull

Pigmentation pattern darkening

43 days
43 days

External hemipenes

Pigmentation pattern darkening further

conclusions
Conclusions
  • Rate of development variable – depends on environment, health of mother, genetics
  • Comparable development at oviposition
  • Development of L. fuliginosus similar to Python sebae – much shorter incubation
continuing work
Continuing work
  • Mating snakes, incubating eggs, harvesting more embryos
  • Clearing and staining – location, timing of bone development in jaws
  • In situ hybridizations – determine presence, location, timing of expression of certain growth factors (Bmp4, Bmp2, Fgf8, Shh)
many thanks to
Many thanks to…
  • Prof. Boback
  • Prof. Mistry
  • Neil Ford
  • Ali Maksimak
  • Mike Montross
  • Chase Walling
works cited
Works cited
  • Boughner, J.C., Buchtova, M., Fu, K., Diewert, V., Hallgrimsson, B., Richman, J.M. 2007. Embryonic development of Python sebae – I: Staging criteria and macroscopic skeletal morphogenesis of the head and limbs. Zoology 212-230.
  • Abzhanov, A., Protas, P., Grant, B. R., Grant, P.R., Tabin, C.J. 2004. Bmp4 and Morphological Variation of Beaks in Darwin’s Finches