World Congress of Malacology Antwerp ... - Unitas Malacologica

influences such as currents may contribute to the diversiform genetic architecture of the symbiont
population observed in this study.
Data about two species of Solenogastres of the NW Iberian Peninsula
Zamarro, María 1 ; Gil-Mansilla, Esther 1 ; Urgorri, Victoriano 2,3 ; García-Álvarez, Oscar 2
1. Unidade de Biodiversidade e Recursos Mariños, Instituto de Acuicultura,
Universidade de Santiago de Compostela, Spain,
Email: iamariaz@usc.es
2. Departamento de Zooloxía e Antropoloxía Física, Facultade de Bioloxía,
Universidade de Santiago de Compostela, Spain,
3. Estación de Bioloxía Mariña da Graña, Rúa da Ribeira 1, 15590-Ferrol,
Universidade de Santiago de Compostela, Spain
The DIVA-ARTABRIA Campaigns have as their main aim the study of the biodiversity of the
organisms of the bathial deep-sea benthos in the western coast of Galicia (NW Spain). Numerous
specimens of Mollusca Solenogastres were collected during the 2002, 2003 and 2004 campaigns and
the first anatomical data of two species are presented herein.
Wirenia sp. (Pholidoskepia). 800 m depth. 2.3 - 3.5 x 0.3-0.6 mm. Thin cuticle (5 µm) without
epidermial papillae. Lanceolate scales with a long keel that doesn´t reach the base, with a rounded
base and a basal and lateral reinforcement (100-137 µm). An only atriobuccal cavity. Pedal groove
with a fold. Sacciform sense organ at the first ventral commissure. Distich radula with two medial
denticles per tooth. Without vesicles or seminal receptacle. Paired/unpaired genital orifice in a bag
placed dorsally to the rostral canal of the paleal cavity. Pair of copulative stylets that come out into
the dorsal bag. Paleal cavity with two lateral bags that provide the paleal cavity the shape of a T. Ten
respiratory folds. Dorsoterminal sense organ. This species is similar to Wirenia argentea, with some
differencies in the final end of its reproductive system.
Hemimenia sp. (Cavibelonia). 1000 m depth. 7.6 x 1-1.2 mm. Thin cuticle (25-30µm). Developed
matrix (50-150µm). Four types of sclerites. Foregut divided in two regions (a very short posterior
one) by a strong muscular ring. With seminal receptacles. Without seminal vesicles. The spawning
ducts are paired throughout, opening by means of a common short cone. Two pairs of copulatory
stylets with gland: the stylets consist of a spine and a gutter-like element arranged ventrally to the
spine. A pair of midgut sacs that surround the copulative stylets partially. Two groups of four
prepaleal stylets. 9-10 respiratory folds. Hemimenia sp. is close to H. cyclomyata, from the same
geographic area, but it differs in its developed matrix, short posterior foregut, midgut sacs and in its
ventral gutter-like elements.
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