Annulotrema spp. (Monogenea: Dactylogyridae) from Characiformes of Cameroon: additional morphological observations and proposal of a new morphogroup

Key Points

• Annulotrema species show distinct morphological features, enhancing classification understanding.
• The newly proposed morphogroup includes specific traits observed in multiple characiformes specimens.
• Assessment involved detailed morphological analysis among various species across Cameroon.
• This work highlights the need for improved taxonomic frameworks within freshwater parasites.