WoRMS source details

Martin, Daniel; Meca, Miguel A.; Gil, João; Drake, Pilar; Nygren, Arne. (2017). Another brick in the wall: population dynamics of a symbiotic species of Oxydromus (Annelida, Hesionidae), described as new based on morphometry. Contributions to Zoology. 86(3): 181-211.
urn:lsid:zoobank.org:pub:D97B28C0-4BE9-4C1E-93F8-BD78F994A8D1 [view]
Martin, Daniel; Meca, Miguel A.; Gil, João; Drake, Pilar; Nygren, Arne
Another brick in the wall: population dynamics of a symbiotic species of <i>Oxydromus</i> (Annelida, Hesionidae), described as new based on morphometry
Contributions to Zoology
86(3): 181-211
World Polychaeta Database (WPolyD)
Available for editors  PDF available [request]
Oxydromus humesi is an annelid polychaete living as a strict bivalve endosymbiont (likely parasitic) of Tellina nymphalis in Congolese mangrove swamps and of Scrobicularia plana and Macomopsis pellucida in Iberian saltmarshes. The Congolese and Iberian polychaete populations were previously considered as belonging to the same species, the latter showing regular distribution, intra-specific aggressive behaviour, and complex host-entering behaviour. The fresh Iberian samples enabled us to undertake consistent morphometric analyses, as well as to further analyse the characteristics of the association and the population dynamics of the Iberian population hosted by S. plana. Among the morphological differences between the Congolese and Iberian specimens, leading to the description of the latter as Oxydromus okupa sp. nov., the most important are: 1) longer cephalic appendages, 2) greater distance between the eyes, 3) larger dorsal cirrostyle in relation to the corresponding dorsal lobe and cirrophore. Moreover, dorsal and ventral lobes are similar in length, with the tip of the former reaching the tip of the latter in O. okupa sp. nov., while the dorsal lobe is much shorter than the ventral one in O. humesi. Mature adults of O. okupa sp. nov. occurred during the whole study period, with a higher percentage of ripe females in spring and, particularly, in summer. Numerous host specimens showed the symbiont’s most preferred shell length (>26 - 36 mm). However, the prevalence was very low (usually <5%) and showed a clear seasonal pattern, being lower during spring/summer. This suggests that males are able to leave their hosts during this period, most likely to improve fertilization by directly entering or approaching a host occupied by a ripe female, while females usually remain inside. Based on the new results, the current knowledge of symbiotic Hesionidae and their relationships with invertebrate hosts is updated and discussed. top
Lusitanian region: Azores, Madeira, Canary Islands to west Iberian Peninsula together
North Atlantic
West Africa
Associations, Symbiosis, Commensalism (parasitism see *PAR)
Morphometry, Form analysis
Systematics, Taxonomy
RIS (EndNote, Reference Manager, ProCite, RefWorks)
BibTex (BibDesk, LaTeX)
2017-10-20 13:48:14Z

Holotype MNCN 16.01/17760, geounit Cadiz, identified as Oxydromus okupa Martin, Meca & Gil in Martin et al., 2017

differences from O. humesi. "Oxydromus okupa sp. nov. differs from O. humesi in body measurement proportions. ... [details]


authors: "epithet “okupa” refers to the Okupas (i.e., the Spanish squatters), a movement that emerged in the ... [details]

 Type locality

Río San Pedro, Cádiz Bay, southern Atlantic coast of the Iberian Peninsula, 36.5323°, -6.2148° ... [details]