INSTRUCTIONS: 1. Fill out the blank with their Dichotomous key. 2. In each numbered series you should read both choices, determine which choice best applies to the Phylum. Note that some Phyla are already given as guides. 3. Proceed where the key tells you to go, often skipping other steps (numbers) in between that do not apply. Dichotomous key for the Major Invertebrate Phyla 1. Radial symmetry or asymmetry…………………………………………….……………………………………….… Proceed to Number 2 Bilateral symmetry………………………………………….……………………………………………………………..… Proceed to Number 4 2. Highly porous surface, not true tissues……………………………………Phylum ________________ Surface is not highly porous, true tissues present………………………………………………………..….. Proceed to Number 3 3. Exhibits pentaramous symmetry and tube feet……………………….Phylum _______________ Lacks pentamerous symmetry and tube feet, possesses tentacles (with nematocysts)…………………………………………………………………………Phylum ________________ 4. Macroscopic colony of sessile, microscopic individuals, individuals <0.5 mm in size…………………………………………………………………………………………………………. Phylum Bryozoa Solitary or colonial in form, individuals of colony › 0.5 mm in size……………………………..….… Proceed to Number 5 5. Gelatinous……………………………………………………………………………………………………………………….. Proceed to Number 6 Not gelatinous…………………………………………………………………………………………………………………. Proceed to Number 7 6. Solitary individuals with 8 rows of comb plates……………….……………….…Phylum Ctenophora Solitary and/or colonial with incurrent and excurrent siphons, and a gelatinous exterior called a tunic.………………………..............……………………………………………………Phylum Chordata 7. Possesses segmentation………………………………………………………………………………………………….. Proceed to Number 8 Lacks segmentation……………………… ………………………………………………………………………………... Proceed to Number 9 8. Exoskeleton with jointed appendages……………………………………Phylum ________________ No exoskeleton, appendages, if present, not jointed, segmented worm-like body, possibly in a tube (if in a tube, may have tentacles)…………....................…Phylum _______________ 9. Possesses a foot, radula, arms and/or shell………………………………Phylum _______________ Lacking all of above, dorso-ventrally flattened to a thickness of less than 1.0 mm……………………………………..…………………………………………………Phylum ________________
INSTRUCTIONS:
1. Fill out the blank with their Dichotomous key.
2. In each numbered series you should read both choices, determine which choice best applies to the Phylum. Note that some Phyla are already given as guides.
3. Proceed where the key tells you to go, often skipping other steps (numbers) in between that do not apply.
Dichotomous key for the Major Invertebrate Phyla
1. Radial symmetry or asymmetry…………………………………………….……………………………………….… Proceed to Number 2
Bilateral symmetry………………………………………….……………………………………………………………..… Proceed to Number 4
2. Highly porous surface, not true tissues……………………………………Phylum ________________
Surface is not highly porous, true tissues present………………………………………………………..….. Proceed to Number 3
3. Exhibits pentaramous symmetry and tube feet……………………….Phylum _______________
Lacks pentamerous symmetry and tube feet, possesses tentacles (with nematocysts)…………………………………………………………………………Phylum ________________
4. Macroscopic colony of sessile, microscopic individuals, individuals <0.5 mm in size…………………………………………………………………………………………………………. Phylum Bryozoa
Solitary or colonial in form, individuals of colony › 0.5 mm in size……………………………..….… Proceed to Number 5
5. Gelatinous……………………………………………………………………………………………………………………….. Proceed to Number 6
Not gelatinous…………………………………………………………………………………………………………………. Proceed to Number 7
6. Solitary individuals with 8 rows of comb plates……………….……………….…Phylum Ctenophora
Solitary and/or colonial with incurrent and excurrent siphons, and a gelatinous exterior called a tunic.………………………..............……………………………………………………Phylum Chordata
7. Possesses segmentation………………………………………………………………………………………………….. Proceed to Number 8
Lacks segmentation……………………… ………………………………………………………………………………... Proceed to Number 9
8. Exoskeleton with jointed appendages……………………………………Phylum ________________
No exoskeleton, appendages, if present, not jointed, segmented worm-like body, possibly in a tube (if in a tube, may have tentacles)…………....................…Phylum _______________
9. Possesses a foot, radula, arms and/or shell………………………………Phylum _______________
Lacking all of above, dorso-ventrally flattened to a thickness of less than 1.0 mm……………………………………..…………………………………………………Phylum ________________
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