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The chondrocranium ofTylosurus crocodilus (Lesueur)

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Proceedings / Indian Academy of Sciences

Summary

The fully formed chondrocranium ofTylosurus crocodilus is of the tropitrabic type. A median nasal septum develops from the ethmoid plate. It is connected dorsally to the sphenoseptal commissure of the orbital cartilage. The olfactory nerve passes through a foramen olfactorium evehens. The trabeculae become discontinuous with the parachordals. A short interorbital septum is formed. The epiphysial cartilage is well developed and extends posteriorly as the taenia tecti medialis. All the three cartilaginous semicircular septa are developed. Meckel’s cartilages anteriorly form a symphysis and posteriorly they bear a retro-articular process. The hyosymplectic does not fuse with the quadrate. The basihyal is continuous with the common copula formed by the first two basibranchials.

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Abbreviations

abc :

anterior basicapsular commissure

ac :

auditory capsule

ba 1–5:

branchial arches 1–5

bcf 1–2:

anterior basicapsular fenestrae

bh :

basihyal

bp :

basal plate

br :

brain

bvc :

basivestibular commissure

cb 1–4:

ceratobranchials 1–4

ch :

ceratohyal

cop 1–2:

copula 1–2 or basibranchials 1–2

eb 1–4:

epibranchials 1–4

eof :

foramen olfactorium evehens

ep :

ethmoid plate

epb :

epiphysial bar

epl :

ethmopalatine process

fh :

foramen in the hyosymplectic or hyomandibular for the hyomandibularis branch of the facial

fme :

metotic foramen

hb 1–3:

hypobranchials 1–3

hh :

hypohyal

hs :

hyosymplectic

lcm :

lateral commissure

lon :

lamina orbitonasalis

mc :

Mackel’s cartilage

n :

notochord

ns :

nasal septum

oa :

occipital arch

olfn :

olfactory nerve

orc :

orbital cartilage

pbr 2–4:

pharyngobranchials 2–4

pc :

parachordal

ptp :

pterygoid process

qu :

quadrate

ra :

retroarticular process of Meckel’s cartilage

sh :

stylohyal

sphc :

sphenoseptal commissure

ssa :

septum semicircularis anterior

ssl :

septum semicircularis lateralis

ssp :

septum semicircularis posterius

tc :

trabecula

tcom :

trabecula communis

tfc :

trigeminofacialis chamber

tsy :

tectum synoticum

ttm :

taenia tecti medialis

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Authors and Affiliations

  1. Department of Zoology, Institute of Science, Bombay

    V. B. Marathe & S. K. Suterwala

Authors
  1. V. B. Marathe
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  2. S. K. Suterwala
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Communicated by Dr. D. V. Bal,f.a.sc.

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Marathe, V.B., Suterwala, S.K. The chondrocranium ofTylosurus crocodilus (Lesueur). Proc. Indian Acad. Sci. 57, 356–367 (1963). https://doi.org/10.1007/BF03052061

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  • DOI: https://doi.org/10.1007/BF03052061

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