Identification/Characteristics of different Genus of Gastropoda.

TURRITELLA:

Fig: Turritella

1. Shell form: Turreted
   
2. Coiling: Conispira
3. Spire: High
4. Suture  line: Inclined
   
5. Axial  character:  Columella, Imperforate
   
6. Aperture: Oval
   
7. Nature  of  the  outer  lib: Thick
   
8. Surface  ornamentation: Spiral rib present
   
9. Special character: Turreted shell form, High and dextral coiling, High spire, Inclined suture line,                                   Imperforate columella.
   
10. Name of the genus: TURRITELLA
    
11. Bio-status: Phyllum-Mollusca                                                                                                                                     Class-Gastropoda
12. Range in time: Cretaceous to present
    
13. Indian horizon: Cretaceous of Narmada valley

NATICA:

Fig : Natica

1. Shell form: Globular
   
2. Coiling: Conispiral/ Trochospiral, Dextral
   
3. Spire: Low
   
4. Suture  line: Slightly inclined and horizontal
   
5. Axial  character: Perforated, Umbellicus present
   
6. Aperture: Sub-circular
   
7. Nature  of  the  outer  lib: Thick,Sharp
   
8. Surface  ornamentation: Smooth
   
9. Special character: Globular shell form, Coiling is conispiral, dextral, Sub-circular aperture,                                         Low spire, perforated umbilicus present.
10. Name of the genus: NATICA
    
11. Bio-status: Phyllum - Moulasca                                                                                                                                Class - Gastropoda
12. Range in time: Triassic to present
    
13. Indian horizon: Intertrappean bed

MUREX:

Fig : Murex

1. Shell form :  Fusiform
2. Coiling:  Conispiral / Trochospiral , Dextral
3. Spire: Medium
4. Suture  line: Slightly  inclined
5. Axial  character: Columella
6. Aperature: Sub-circular
7. Nature  of  the  outer  lib: Thick
8. Surface  ornamentation: Spiral ribs  are  present
9. Special character:  Shell form is fusiform, dextral coiling, medium spire, slightly Inclined                                             suture line, columella is present
10. Name of the genus: MUREX
11. Bio-status: Phyllum-Mollusca                                                                                                                                        Class-Gastropoda
12. Range in time: Eocene to present
13. Indian horizon: Rannikot formation

  CERITHIUM:

Fig:Cerithium

1. Shell form: Turrated
2. Coiling: Conispiral / Trochospiral , Dextral
3. Spire: High
4. Suture  line: Inclined
5. Axial  character: Imperforate,columella present
6. Aperature: Slightly  oval
7. Nature  of  the  outer  lib: Thin
8. Surface  ornamentation: Spiral rib present
9. Special character:  Turreted shell form,High and dextral coiling,High spire,Inclined suture                                           line,Imperforate columella present
10. Name of the genus: CERITHIUM
11. Bio-status: Phyllum-Mollusca                                                                                                                                    Class-Gastropoda
12. Range in time: Cretaceous to present
13. Indian horizon: Intertrappean bed

VOLUTA:

Fig: Voluta

1. Shell form: Oval
2. Coiling: Conispiral,Dextral
3. Spire: Low
4. Suture  line: Slightly inclined
5. Axial  character: Imperforate,columella present
6. Aperature: Elongated
7. Nature  of  the  outer  lib: Thick
8. Surface  ornamentation:  Not distinct
9. Special character: Shell form is oval, conispiral , dextral coiling, low spire, suture  line is                                            slightly   inclined, imperforate, columella present.
10. Name of the genus: VOLUTA
11. Bio-status:Phyllum-Mollusca                                                                                                                                        Class-Gastropoda
12. Range in time: Cretaceous to present
13. Indian horizon: Nam beds of Miocene 

CONUS:

Fig;Conus

1. Shell form: Bi-conical
2. Coiling: Conispiral , dextral
3. Spire: Low to medium
4. Suture  line: Almost horizontal
5. Axial  character: Imperforate,columella present
6. Aperature: Narrow  and straight
7. Nature  of  the  outer  lib: Thin
8. Surface  ornamentation: Not distinct
9. Special character:  Bi-conical shell form, low to medium spire, suture line is almost  horizontal, Imperforate columella present
10. Name of the genus: CONUS
11. Bio-status: Phyllum-Mollusca                                                                                                                                          Class-Gastropoda
12. Range in time: Cretaceous to present
13. Indian horizon: Cretaceous to trichinopoly

CYPRAEA: 

Fig:Cyprea

1. Shell form: Oval
   
2. Coiling: Conispiral,dextral
   
3. Spire: Early whorls are covered by whorl
   
4. Suture  line: Not visible
   
5. Axial  character: Imperforate,columella present
   
6. Aperature: Straight,narrow and long as the shell
   
7. Nature  of  the  outer  lib: Outer and inner lib both are cranulated
   
8. Surface  ornamentation: Smooth
   
9. Special character: Shell form is oval, coiling is conispiral and dextral, suture line not visible,                                      imperforate, columella present, straight, narrow aperature, envolute.
   
10. Name of the genus: CYPRAEA
11. Bio-status: Phyllum-Mollusca                                                                                                                                        Class-Gastropoda
    
12. Range in time: Eocene to present
    
13. Indian horizon: 

PHYSA:

Fig. : Physa

1. Shell form:Bi-conical
2. Coiling: Conispiral/ Trochispiral,straight
3. Spire: Medium to low
4. Suture  line: Inclined at an angle of almost 40-45
5. Axial  character: Imperforate,columella present
6. Aperature: Oval
7. Nature  of  the  outer  lib: Thick
8. Surface  ornamentation: Smooth
9. Special character: Bi-conical shell form, coiling is conispiral, medium to low spire, oval aperature
10. Name of the genus: PHYSA
11. Bio-status: Phyllum-Mollusca                                                                                                                                          Class-Gastropoda
12. Range in time: Plistocene to recent
13. Indian horizon: Intertrappen bed