Contributions to Zoology, 86 (3) – 2017Daniel Martin; Miguel A. Meca; João Gil; Pilar Drake; Arne Nygren: Another brick in the wall: population dynamics of a symbiotic species of Oxydromus (Annelida, Hesionidae), described as new based on morphometry

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Oxydromus humesi (Pettibone, 1961) 8453A918-89A8-4EEB-B78D-F9C452A39FA5


Parasyllidea humesi Pettibone, 1961. Pettibone (1961): figs. 4a-4h.

Oxydromus humesi (Pettibone, 1961). Martin et al. (2015) 434-441, figs. 4 (A, C, E), 5 (C, D, E, H) - 6 (A, C) - 7.


Material examined. Paratypes: USNM 30012, ca. 50 specimens fixed in formalin and preserved in 70% ethanol, Loango, Republic of Congo. (West Africa, approximately 4°37’42.6”, 11°49’30.0”); intertidal, mangrove muddy bottoms.


Morphometric diagnosis. Based on the average proportions being significant different from O. okupa sp. nov. (Table 8); “long” and “short” refer to parapodia of chaetigers 10 and 15, bearing long and short cirrostyles, respectively. General morphological description same as O. okupa sp. nov. Ratios number of segment and body width (without parapodia) vs. body width (with parapodia) ca. 0.03 and 0.5, respectively. Lateral antennae, palpophores and palpostyles ca. 0.5, 0.25 and 0.4 as long as prostomium length, respectively. Distance between anterior and posterior eyespots ca. 0.21 as long as prostomium length. Distance between anterior eyespots ca. 1.06 as long as that between posterior ones. Long and short dorsal cirrostyles 9 and 8 as long as cirrophores and 1.5 and 1.2 as long as dorsal lobes, respectively. Ventral lobe twice as long as dorsal one. Serration near blade tip less than twice short as blade width.


Table 8. Comparative table of the morphometric measurement proportions in the Iberian and Congolese populations. Differences expressed as percentages, with bold characters indicating significant differences (according to Benjamini and Hochberg, 1995) that may be higher (normal text) or lower (italics) in the Iberian than in the Congolese population. Measurement abbreviations as in Fig. 1. Min: minimum; Max: maximum; Mean: average ± standard deviation; F: Fisher’s F index; p: significance level.