World Congress of Malacology Antwerp ... - Unitas Malacologica

A new species of nudibranch (Gastropoda, Nudibranchia, Dorididae) of the Ría of Ferrol
(NW Iberian Peninsula, Spain)
Señarís, Marcos P. 1 ; Urgorri, Victoriano 1,2 ; Díaz-Agras, Guillermo 2 ; Corral, Eva 1 ; Botana,
Alba G. 1 ; Moreira, Juan 2
1. Departamento de Zooloxía e Antropoloxía Física, Facultade de Bioloxía,
Universidade de Santiago de Compostela, Spain,
Email: zmmarcos@usc.es
2. Estación de Bioloxía Mariña da Graña, Rúa da Ribeira 1, 15590-Ferrol, Universidade de Santiago
de Compostela, Spain
In the researches that have been carried out about the Nudibranchia Mollusca of Galicia (Spain)
during the last 30 years, 18 specimens of a rare Doridacea have been collected and their study has
shown that this is actually a new species for the science. The size of the specimens ranges between 20
and 71 mm long. They were collected in two stations of the Ría de Ferrol on an infralittoral bottom
between 17 and 20 m depth.
The specimen has an orangey-yellow color with a very dense and thin black dotting that may be only
observed by means of a stereoscope microscope. Its back is covered with spherical tubercles with a
rough surface, slightly pointed and with a small basal stalk; the tubercles have different sizes: large,
medium and small. Laminar rhinophores and 6 to 8 tripinnated branchiae, being both structures
encircled by a rather high sheath around its base. It has two oral lobes, although it presents no
tentacles. Labial cuticle lacking rodlets. Mantle with a hard consistency, a very thick spicule
framework may be observed ventrally. The intertegumental spicules are dense on the mantle, foot,
rhinophores and branchiae, being also of two different kinds: irregular fusiform of different sizes and
very small spherules that may be only found on the mantle and rhinophores.
The radula lacks any central tooth, it is composed of 38 rows with 72 simple hook-shaped teeth per
row and with 3-4 marginal teeth on each side with bristles on the cusp. The genital system presents a
short penis without spines or hooks, a short deferent duct and a fusiform prostate; its ampulla is long
and narrow. It has a large and spherical bursa copulatrix and an oval seminal receptacle.
According to VALDES (2002), the new species is placed within the genus Doris, being therefore a
new species Doris sp.
Molecular diversity and phylogenetic relationships of the family Viviparidae (Gastropoda,
Mollusca) with special emphasis on the Bellamya radiations in the Rift Valley Lakes of Africa
Sengupta, Mita E.; Kristensen, Thomas K.; Madsen, Henry; Jørgensen, Aslak
Mandahl-Barth Research Centre for Biodiversity and Health, DBL, Centre for Health Research and
Development, Department of Veterinary Pathobiology, Faculty of Life Sciences, University of
Copenhagen, Jægersborg Alle 1D, 2920 Charlottenlund, Denmark,
Email: gaidatham@hotmail.com; tkk@life.ku.dk; hmad@life.ku.dk; aslak@life.ku.dk
Two genera of the gastropod familiy Viviparidae are currently recognized on the African continent,
i.e. the widespread Bellamya with 18 species, and the monotypic Neothauma, which is endemic to
Lake Tanganyika. The genus Bellamya has radiated in the Rift Valley Lakes and intralacustrine
speciation accounts for most of the species (67%). Lake Victoria is the relatively youngest of the Rift
Lakes, however comprising the highest number of endemic species. To investigate the phylogenetic
relationship of Bellamya we studied 10 taxa (N=43) of the family Viviparidae from the Great Rift
Valley Lakes and one out-group, Viviparus contectus from Denmark. Sequence variation was
assessed for partial sequences of the nuclear histone H3, the mitochondrial cytochrome c oxidase
subunit I (COI) and 16S ribosomal DNA. Maximum parsimony, maximum likelihood and Bayesian
inference analyses were conducted. The COI diversity within the lakes was low; Lake
Victoria/Albert/Kyoga (0-2.2%) and Lake Malawi (0-1.9%). This suggests that either differentiation
in Bellamya is not accompanied by strong sequence divergences or the number of Bellamya species is
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