Description of a new species in the genus Tambja Burn, 1962 (Gastropoda: Nudibranchia: Polyceratidae) from southern Spain

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THE VELIGER
© CMS, Inc., 1998
The Veliger41(4);344-350 (October 1. 1998)
Description of a New Species in the Genus Tambja Burn, 1962
(Gastropoda: Nudibranchia: Polyceratidae) from Southern Spain
KARL-LUDWIG SCHICK
Colegio Aleman Juan Hoffmann/Deutsche Schule in der Provinz Malaga, Apdo. 318, 29600 Marbella (Malaga), Spain
AND
JUAN LUCAS CERVERA
Departamento de Biologia Animal, Vegetal y Ecologia, Facultad de Ciencias del Mar, Universidad de Cadiz,
Apdo. 40, 11510 Puerto Real (Cadiz), Spain
Abstract. A new species of Tambja is described from the western Mediterranean on the coast of southern Spain.
The external and internal features of this species are compared with those of the known Atlantic species of the genus.
Tambja marbellensis sp. nov. varies in color between dark blue, almost black, and dark greenish blue. It has a yellow
band on the edge of the notum and the foot, and other bands of the same color and differing in length, on the notum,
flanks, and tail. The radula is typical ofthe genus Tambja, with the inner lateral tooth having a conspicuous denticle on
the inner edge of the primary cusp. The second inner lateral tooth also has a small cusp. The reproductive system has
a differentiated prostate from the deferent duct, and the bursa copulatrix and the seminal receptacle are similar in size.
INTRODUCTION laga) (36°52'35"N. 04°30'01"W), southern Spain, July
To date, the only known species of the genus Tambja 1995, K.L. Schickcoll. This specimenhas been deposited
Bum, 1962, in European waters is T. ceiitae. Described in the Museo Nacional de Ciencias Naturales of Madrid,
csoolmleectyeedarosnatghoebcyoaGstarocfiCae-uGtoame(zAf&ricOarntesaid(e1o98f8t)h,eitStwraaist witPhartahteypcea:taOlnoeguespneucimmbeenr, 1152.0m5m/26i0n31le.ngth, collected at
of Gibraltar). This species has been recorded recently on 10 m depth Torre del Cable, May 1995, K.L. Schickcoll.
the coast of the Azores Archipelago (Wirtz & Martins, A photograph of this specimen and its radula have been
1993; Wirtz, 1995) and the Canary Islands (Ortea et al., deposited in the Museo Nacional de Ciencias Naturales,
1996). with the catalogue number 15.05/27819. We have depos-
Frequent samplings along the coast of the Province of ited only the photograph and radula, because the speci-
Malaga (southern Spain, western Mediterranean) have men died early in the aquarium before we were able to
permitted us to find specimens of a second undescribed preserve it. The specimen was slightly decomposed and
species of Tambja. which is described in this paper. all of the internal structures, with the exception of the
radula, could not be studied.
SYSTEMATIC DESCRIPTION
Suborder DORIDACEA Diagnosis: Body limaciform with widened head; notum
Family Polyceratidae Alder & Hancock, 1845 with smoothedge andtail. Groundcolordarkblueordark
Genus Tambja Bum, 1962 greenish blue. Edge of notum and foot yellow; notum
Tambja marbellensis Schick & Cervera, sp. nov. flanks of body and tail with several yellow stripes differ-
ent in length. Outer surface ofgill rachis yellow and rhi-
(Figures 1-3)
nophoral sheaths bordered with yellow. Yellow stripes
mm
Material: Holotype: One specimen, 45 in length, and marks shaded with brown. Rachidian tooth wider
collected at 10 m depth, Torre del Cable (Marbella, Ma- than tall and notched at anterioredge; innerlateralradular
Figure 1
Tambja marbellensis Schick & Cervera, sp. nov. Dorsal view (A), lateral view (B), and detail ofthe anterior part
(C) ofthe holotype. D. Detail ofthe rhinophore. E. Dorsolateral view ofthe paratype. Key: br, brownish; db. dark
blue; dgb, dark greenish blue; ye, yellow.
&
K.-L. Schick J. L. Cervera, 1998 Page 345
dgb mm
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Figure 2
7". marbellensis Schick & Cervera, sp. nov. A. General view oftheradulaofthe holotype. B. Detail oftherachidian
and lateral radular teeth ofthe paratype. C. Detail ofthe dorsal view ofthe cusps ofthe inner lateral radularteeth
ofthe holotype (arrow heads indicate the inner denticle).
tooth hooked, with large bicuspid primary cusp; second
inner lateral tooth with small cusp. Rounded bursa cop-
ulatrix and pyriform seminal receptacle similar in size;
prostate well differentiated and vestibular gland well de-
veloped.
Description: Body limaciform with widened head; no-
tum, and its edge and tail smooth. Oral tentacles short
and dorsoventrally flattened. Dark blue rhinophores have
25 lamellae and conical clavus (Figure ID). Smooth
sheaths dark blue bordered with yellow. Five gills tripin-
nate and non-retractile, situated around anal papillae.
—
Figure 3
T. marbellensis Schick& Cervera,sp. nov. Reproductivesystem.
Key: am, ampulla; be, bursa copulatrix; dd, deferent duct; fgl,
female gland; hd, hermaphroditic duct; p, penis; pr, prostate; ps,
penial sheath; sr, seminal receptacle; va, vagina; vgl, vestibular
gland.
K.-L. Schick & J. L. Cervera, 1998 Page 349
Three anterior gills more highly developed. Gills dark ternal anatomy of both species, the inner lateral tooth is
blue with yellow outer surface of rachis. Ground color bicuspid in T. marbellensis and monocuspid in T. ceutae,
varies between darkblue, almost black, and dark greenish and the two allosperm receptacles are similar in size in
blue. Yellow band around edge of notum. Notum with the former species and different in the latter. Moreover,
several stripes ofthis color (Figure 1). Midline extending the deferent duct in T. ceutae is more elongate andcoiled
from anteriorpart ofhead, near edge ofnotum, to middle than in our species.
gill, branching onto outer side of rachis. Another two As Garcia-Gomez & Ortea (1988) pointed out previ-
lines start fromposteriorcephalic region andrun between ously, the species attributed to T. diaphana (Bergh, 1878)
middle line and edge of notum reaching gills, extending (quoted as Nembrotha) by Pruvot-Fol (1927) from the
on outer side of each rachis (Figure lA, C). Two other Moroccan coast could constitute a new species of this
yellow hnes start from notal region in front of gills and genus, although the exact identity of that species would
run very close to edge of notum ending in postbrachial require the study of additional specimens from the same
region. Another two yellow lines start from base of gills locality ornearby areas. On the otherhand, we agree with
to posterior region of notum, but without reaching edge. the opinion ofDrs. Richard Willan and Clay Carlson (per-
Edge of foot also bordered by yellow band, which joins sonal communication) that since every species ofthe ge-
that of edge of notum via band of same color that runs nus Tambja has a limited geographical range, it is prac-
dorsally down tail. Several yellow lines, varying in num- tically impossible that the Pruvot-Fol species is conspe-
ber and length according to size of specimen, distributed cific with Bergh's T. diaphana from the Palau Islands
on both flanks of body (Figure IB). In adult specimen, (tropical Pacific). Our species can be distinguished from
only one of these lines runs from cephalic region as far thePruvot-Fol species since, accordingtoherdescription,
as dorsal line on tail. Central region of almost all these it has a sulphur yellow ground color with emerald green
lines was brownish shade, in 45 mm specimen (Figure lines on the back thatjoinbetween thembefore therhino-
lA). phores and behind the gills.
With respectto internal anatomy, radularformulaof 12
mm specimen 13 X 3-4.l.R.1.3-4 and that of 45 mm Etymology: The specific name refers to Marbella, the
specimen 16 X 3-4.l.R.1.3-4 (Figure 2A). Rachidian type locality of the species.
tooth, wider than tall, notched at anterior edge. Inner lat- ACKNOWLEDGMENTS
eral tooth hooked with large primary cusp, with conspic-
uous denticle on inner edge (Figure 2A, B), and smaller Our sincere gratitude to Dr Terrence M. Gosliner for the
triangular basal cusp (Figure 2C). Remaining lateral teeth critical reading of the manuscript, to Colin Redfem and
scalelike and less developed than former (Figure 2B), al- Jack Worsford for supplying us unpublished data and a
though second inner lateral has small cusp. Reproductive photograph of Tambja oliva from the Bahamas, and to
system (Figure 3) with hermaphroditic duct that contin- Drs. Richard C. Willan and Clay Carlson for their com-
ues, as S-shaped ampulla. Bursacopulatrixrounded; sem- ments on some questions regarding this paper Likewise,
inal receptacle pyriform, both similar in size. Vaginavery our gratitude to the scuba diving club COIS from Mar-
straight, entering female gland almost at central region. bella, and particularly to Mr. Jose Maria Urda Haro and
Oval vestibular gland well developed. Deferent duct with Mr Salvador Galdeano Urda for their invaluable help
well-differentiated prostate. Penis armed with numerous during our samplings. Finally, we also thank Mr. Agustin
hooked spines. Santos for his help in some aspects ofthe elaboration of
the manuscript, and Mr. Juan Gonzalez of the Electron
DISCUSSION Microscopy Service of the University of Cadiz for sup-
plying the facilities to take the scanning electron micro-
To date, only seven species of the genus Tambja have scope photographs.
been described from Atlantic waters. The most important This work has been partially supported by the project
features of these species are compared in Table I. The "FAUNA IBERICA III" SEUI-DGICYT PB92-0121.
external and internal features of T. marbellensis permitit
tobe distinguished from the remaining cogeneric Atlantic LITERATURE CITED
species, including T. ceutae, which is the most similar
species. T. marbellensis lacks the conical papillae of the Bergh, R. 1890. Report on the nudibranchs. Report on the re-
notal ridge and tail characteristic of T. ceutae. which are sults of dredging under the supervision of Alexander Ag-
even more conspicuous in young specimens (personalob- assiz, in the GulfofMexico (1877-1878) and in the Carib-
servation), the yellow lines on the inner surface of the bean sea (1879-1880) by the U.S. Coast Survey steamer
"Blake" Lieut.-Commander CD. Sigsbee, U.S.N., and
rachis ofthe gills ofthe second species, and also the two Commander J.R. Bartlet, U.S.N, commanding. Bulletin of
large dark grey spots behind the rhinophores ofthat spe- the Museum of Comparative Zoology of Harvard 19:155-
cies, but it has the yellow lines shaded by brown that do 181.
not occur in those of T. ceutae. With respect to the in- Bergh, R. 1907. The Opisthobranchiata ofSouth Africa. Trans-
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