HOMOSCLEROMORPHA FROM THE

Cruz-Barraza, José Antonio, Vega, Cristina & Carballo, José Luis, 2014, Taxonomy of family Plakinidae (Porifera: Homoscleromorpha) from eastern Pacific coral reefs, through morphology and cox 1 and cob mtDNA data, Zoological Journal of the Linnean Society 171 (2), pp. 254-276 : 271

KEY FOR SPECIES OF HOMOSCLEROMORPHA FROM THE EASTERN PACIFIC REGION

1. Mineral skeleton present.................................................................................................................. 2

1′. Mineral skeleton absent............................................................................................. Oscarella carmela

2. Calthrops absent..............................................................................................................3 ( Plakortis )

2′. Calthrops present............................................................................................................................5

3. Choanosomal skeleton with structure alveolar reticulation ..................................................................... 4

3′. Choanosomal skeleton without a defined structure..................................... Plakortis clarionensis sp. nov.

4. Diods in a single large size category (12–162.5 μm) ........................................................ Plakortis albicans

4′. Diods in two size categories (126–165 and 27–92 μm)................................................ Plakortis galapagensis

5. Lophose calthrops absent............................................................................ Plakinastrella clippertonensis

5′. Lophose calthrops present together with simple calthrops.........................................................6 ( Plakina )

6. Only one type of lophose calthrops..................................................................................................... 7

6′. Two type of lophose calthrops (mono- and tetralophose) ....................................................... Plakina bioxea

7. Monolophose calthrops ..................................................................................................................... 8

7′. No monolophose calthrops.................................................................................................................9

8. Monolophose calthrops in a single category..................................................... Plakina muricyae sp. nov.

8′. Monolophose calthrops in two categories ......................................................................... Plakina pacifica

9. Dilophose calthrops........................................................................................................................10

9′. Trilophose or tetralophose calthrops.................................................................................................. 11

10. Smooth surface; dilophose calthrops in a single category.............................. Plakina paradilopha sp. nov.

10′. Microlobate surface; dilophose calthrops in two size categories ...................................... Plakina microlobata

11. Trilophose calthrops.......................................................................................................................12

11′. Tetralophose calthrops, conspicuously spined category of triods................................................ Plakina atka

12. Large encrusting (1–1.5 cm) sponge with a convoluted surface pattern, rare triods (24–36 μm/ray).................. ................................................................................................................................ Plakina fragilis

12′. Small, thin encrusting (0.3 mm) sponge without convoluted surface, triods in two shape categories: (1) smooth and thinner (24–50 μm/ray); (2) thicker, often with one short, spine near the base of each ray (22–38 μm/ray) ................................................................................................................................. Plakina tanaga