Identification Of Brachiopoda.

 IDENTIFICATION OF GENERA OF FOSSIL BY THEIR EXTERNAL MORPHOLOGY AND
STRATIGRAPHIC RANGES BRACHIOPODA (ARTICULATA):

SPIRIFER:

Fig: Spirifer view(Dorsal,Ventral and Side view)

1. Shell form: Triangular
2. Hinge line: Straight and longer than the maximum width
3. Pedicle valve: Convex,median sulcus is present,foramen present not distinct
4. Brachial valve: Convex,almost equal in size with pedicle valve,prominent plica is present
5. Anterior margin: Rough
6. Surface ornamentation: Numerous radial rib, growth line not prominent
7. Special character: Hinge line straight and longer than the maximum width,prominent median  sulcus and prominent plica is present, shell is traiangular
8. Bio-status: Phyllum-Brachiopoda                                                                                                                              Class-Articulata
9. Name of the genus: SPIRIFER
   
10. Geological age: Silurian to present
11. Indian horizon:

PRODUCTUS:

Fig 1: Ventral view, Fig2: Dorsal view 

1. Shell form:Sub-rounded
2. Hinge line: Straight,Shorten than the maximum width
3. Pedicle valve: Convex,median sulcus is present
4. Brachial valve: Concave,sinus is present
5. Anterior margin: Rough/folded
6. Surface ornamentation: Prominent radial rib and poor development of growth line.
7. Special character: Shell form is sub-rounded,hinge line is straight convex pedicle and          concave brachial valve.
8. Bio-status: Phyllum-Brachiopoda                                                                                                                              Class-Articulata
9. Name of the genus: PRODUCTUS
10. Geological age: Ordovician to recent
11. Indian horizon: Spite

TEREBRATULA:

Fig 1: Dorsal view ,Fig 2:Ventral view and Fig 3 : Side view

1. Shell form: Oval
2. Hinge line: Curve
3. Pedicle valve: Convex,prominent foramen is present
4. Brachial valve: Convex,small plica is present
5. Anterior margin: Slightly curved
6. Surface ornamentation: Poor development of growth line
7. Special character: Shell form is oval,curved hinge line,prominent foramen is present and small plica is present.
8. Bio-status: Phyllum-Brachipoda                                                                                                                               Class-Articulata
9. Name of the genus: TEREBRATULA
   
10. Geological age: Ordovician to recent
11. Indian horizon: Trichy cretaceous bed

RHYNCHONELLA:

Fig 1: Dorsal view Fig 2: Ventral view
Fig 3 : Side View

1. Shell form:Triangular
2. Hinge line: Curve
3. Pedicle valve: Convex,median sulcus is present, Foramen is present
4. Brachial valve: Slightly convex or planner
5. Anterior margin: Rough /folded
6. Surface ornamentation: Radial rib present
7. Special character: Shell form is triangular,median sulcus and foramen are present,brachial valve is slightly convex or planner
8. Bio-status: Phyllum-Brachipoda                                                                                                                            Class-Articulata
9. Name of the genus: RHYNCHONELLA
   
10. Geological age: Upper jurassic
11. Indian horizon: Trichy cretaceous bed