Species ID
OC-SP-0002645
Discovered
Phylum
Platyhelminthes
Species ID
OC-SP-0002645
Provisional Species Name
Promesostoma sp_S_1844
Lowest Valid Taxon Name in WoRMS
Promesostoma
Lowest Known Rank
Genus
Status
Discovered
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Embargo
No
Kingdom
Animalia
Phylum
Platyhelminthes
Order
Rhabdocoela
Family
Promesostomidae
Genus
Promesostoma
Taxonomic Remarks
The genus Promesostoma is, by far, one of the most taxonomically complex taxa within Rhabdocoela, with 43 described species. Identification of species of Promesostoma is based on the stylet morphology, the presence/absence of a male copulatory bursa and distal glandular organ, the number of seminal vesicles, and the position of the male atrial organs respect to the pharynx. Promesostoma sp.1 is related to the clade of species ‘roseapharynx’ and particularly to P. roseapharynx. Both species present the proximal funnel of the stylet bent over ~90°. However, Promesostoma sp.1 lacks the distinctive pinkish colouration of the pharynx as is the case in P. roseapharynx. Furthermore, the stylet of P. roseapharynx (177 µm long) is some shorter than that of Promesostoma sp.1 (182 µm). The proximal funnel of the stylet of Promesostoma sp.1 is larger than that of P. roseapharynx, and the stylet ends in a blunt vs. an oblique, sharp tip, respectively.
Received All Minimal Data for Discovery
01/04/2026
Description of Material
Species of Promesostoma with eyes. Male copulatory bursa present. Curved stylet situated beside the pharynx, 174–192 µm long (x¯ = 182 µm; n = 3), with the proximal funnel bent over ~90°, distal end blunt. The prostate and the single seminal vesicles are oriented backwards; prostate vesicle situated anterior to the pharynx and the seminal one latero-posteriorly.
Ecology
Fine-grained, silty sand, 0.5 m deep, salinity 35 ‰.
Distribution
United States of America, Florida, Fort Pierce, Old Ford Park, 27.437535; -80.319533.
Scientific Name Authorship
Diez, Yander L.
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