29 de marzo de 2022

Key to mediterranean Echinocardium species just by top view of the test

1a - Anterior central petal shaped like a plateau, pores only at center: -> 2

2a - Bulky heart shape: Echinocardium mediterraneum (-4cm)
2b - Round "inflated" shape: Echinocardium mortenseni (-5cm)
2c - Similar to b, but with tubercules between anterior and posterior petals: Echinocardium flavescens (-3cm)

1b - Anterior central petal shaped like a channel with rows of pores all along the length: -> 3

3a - Pores of anterior petal in one row to each side; number of pore pairs on posterior petal (11)-12+: Echinocardium fenauxi (-8cm)
3b - Pores of anterior petal in more than one row to each side; number of pore pairs on posterior petal 8-10: Echinocardium cordatum (-9cm)

... I'll happily stand corrected if some of my infos are outdated or wrong.

Ingresado el 29 de marzo de 2022 por stefadrian stefadrian | 0 comentarios | Deja un comentario

30 de septiembre de 2021

Padina pavonica: Complex in the Mediterranean Sea!

"Complex Padina pavonica": A species complex for several closely related Padina species.
Mediterranean specimen that you would usually ID "Padina pavonica" are actually one of three different species:

Padina pavonica s. str. (s. str.= in a strict sense)
Padina pavonicoides sp. nov. (sp. nov.= newly described species)
Padina ditristromatica sp. nov.

https://www.researchgate.net/publication/233448273_Padina_ditristromatica_sp_nov_and_Padina_pavonicoides_sp_nov_Dictyotales_Phaeophyceae_two_new_species_from_the_Mediterranean_Sea_based_on_morphological_and_molecular_markers

[EDIT: Additionally, Padina boergensenii has been introduced to the SE-Mediterraneis (reported 2015 Israel, info from agaebase.org). So we have at least 4 different species to think about when IDing in the Mediterranean Sea.]

Distinction: only possible by genetic or micromorphological analysis.

Distribution: Mediterranean for all three species. Specific range within the Mediterranean Sea unknown, since observations on a macroscopic level cannot be assigned to a species with certainty in many if not all cases. Extramediterranean range well documented for pavonica, but entirely unknown for pavonicoides and ditristromatica.

ID: 71 species are accepted for the Genus Padina. Calling mediterranean observations "Padina sp." is somewhat frustrating, since they can be told apart from the other 68 species (at least in the Mediterranean sea). That's why I propose to ID those observations "Complex Padina pavonica".
If you are no scientist, then go on adressing this iconic alga in your favored common name.
If you are a scientist: maybe take some samples and confirm your pics with microscopic fotos?
Thanks for reading.


Any news on the topic? Especially on macroscopic distinguishing features? Please contact me.

Ingresado el 30 de septiembre de 2021 por stefadrian stefadrian

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