BOLETIM DO MUSEU NACIONAL ZOOLOGIA NOVA SERlE RIO DE JANEIRO -BRASIL

BOLETIM DO MUSEU NACIONAL NOVA SERlE RIO DE JANEIRO - BRASIL ISSN 0080-312X

ZOOLOGIA

N° 425

22 DE AGOSTO DE 2000

NEW RECORDS OF VERRUCOMORPHA (CIRRIPEDIA, CRUSTACEA) OFF RIO GRANDE DO SUL, BRAZIL (Il (With 9 figures)

SIMONE NUNES BRANDAO (2)

Museu Nacional Universidade Federal do Rio de Janeiro

The suborder Verrucomorpha includes three families, but only Verrucidae is represented in the Brazilian fauna. Seven species in five genera were recorded from the Brazilian coast: Altiuerruca gibbosa (Hoek, 1883); Altiuerruca quadrangularis (Hoek, 1883); Costatouerruca caribbea (Pilsbry, 1916); Costatouerruca flauidula (Pilsbry, 1916); Metauerruca recta (Aurivillius, 1898); Rostratouerruca nexa (Darwin, 1854); Verruca minuta Young, 2000 (HOEK, 1883; NILSSON-CANTELL, 1927; YOUNG, 1993; 1995; 1999a; 1999b; 2000). In the present work, seven samples from the continental slope off the southern coast (state of Rio Grande do Sui) of Brazil are identified and re -described. The fe-descriptions are necessary since the original descriptions concern merely the shells, not including the soft parts. Furthermore, Costa to verruca flavidula was only superfidally described as a subspecies of C. calotheca (Pilsbry, 1907). The geographic distribution of the species of the suborder Verrucomorpha off Brazil is analyzed. MATERIAL AND METHODS

The 'seven samples studied in this work were collected during the project "Talude", in 1992 and 1997, by the Oceanographic Research Vessel "Atlantico SuI" from the Fundac;:ao Universitaria do Rio Grande, off the state of Rio Grande do SuI, Brazil. The identifications are based on ·the original descriptions of DARWIN (1854) and PILSBRY (1907; 1916) and on taxonomic keys (YOUNG, 19980.). The specimens were illustrated with Zeiss microscope camera lucida. Abbreviations used in this study: Museu Nacional - Rio de Janeiro (MNRJ); Oceanographic Research Vessel (R.V.). ... 1 Received on March 20, 2000. Accepted on August 18, 2000. 2 Fellow ofConselho Nacional de Desenvolvimento Cientifico e Tecnol6gico (CNPq).

S.N. BRANOAo

TAXO NOMY Family Verrucidae Darwin, 1854

Genus Costatoverruca Young, 1998 Costaloverruca calolheca (Pilsbry, 1907)

(Figs.l , 2) ;·erruca calolheca PILSBRY, 1907:110, pLlI, figs. 1-3; PILSBRY, 19 16:33, pIA, ::gs.4-4b; BROCH, 1931: 130; ZULLO, 1968:2 19; WEISBORD:1979:72, pL8, figs.7:: ; BUCKERIDGE , 1994:90. Cosralovernlca calotheca: YOUNG, 1998a:78. ~laterial examined - RIO GRANDE DO SUL, BRAZIL: MNRJ 13405, 1992, 32°S 5U'W, 520m, 9 spec., RV. "Atlantico SuI" team coil. Y~osis

- opercular plates parallel to basis. Tergum and scutum with 4 articular with ridges directed toward basis of scu tum. Carina without ridges directed toward basis of tergum (modified from PILSBRY, 1907). :iC.ges. Myophore absent. Rostru m

::Jescription - s h e ll (Figs. lA, IB) whi te, box-like. Basal m a rgin of wall not inflected. ~fem branous basis. Opercula r plates nearly parallel to basis. Suture between :ostrum and carina sinuous, with well- d eveloped articular ridges, first ridge the !arges!. Carina (Fig. IA) smaller than rostrum. Rostrum (Fig. 1A) with ridges directed :oward basis of scutum. Umbo of rostrum marginal to basis of scutum. Fixed:ergurn (Fig.IB) as high as and narrower than fixed-scutum, smooth, with two a late projections and triangular central a rea . Fixed-scutum (Fig.IB) s mooth, with ala!ike projection at rostru m a nd radius-like projection a t ftxed-tergum. Myopho re abse nt. Suture between tergum and scutum (Fig.IA) sinuous. Te rgum larger than scutum, nearly quadra ngu lar, with fou r articular ridges; first ridge s m allest and !ea.st developed; fourth ridge largest a nd most developed. Distan ce between fi rst and second ridges largest; di s tan ce between second a nd third rid ges shortest. Second ridge rarely rea ching a pex. Cari nal margin straight. Internal surface of tergum s lightly concave, internal scutal m a rgin s inuous (Fig.IC). Scutum (Fig. lA) aiangu lar, basis narrow; with four articu lar ridges, increasing in size from apex to basis. Rostral area with barely deve loped longitudinal ridge. Beaked apex directed toward tergum. Interna l surface of scutum co ncave, internal tergal margin sinuous, internal rostral margin s lightly s inuous. Labru m (Fig.2A) with one row of nea rly 40 s imp le teeth . Palp (Figs.2A, B) small, acu minate, with few setae on its margins. Mandible (Fig. 2C) with four teeth, fourth tooth and lower angle denticulate. Distance between first and second teeth twice the distances b etween othe r teeth. Lower angle of maxilla I (Fig.2D) projec ting anteriorly. Upper border with one pair of large and one p air of s mall spines, followed by two spines on h a lflength of distal border, and three pa irs of large spines and two pairs of small s pines on lowe r angle. Maxilla II (Fig.2E) triangular, anterior margin with small medial concavity; numerous s etae along m a rgin, a nd few small setae on distal portion of lateral surface. Ahterior ramu s of cirrus I (Fig.2F) about 3/4 length of posterior ra mus, nume rous setae on proximal artic les, distal articles with fewer setae. Protopod of cirrus I with numerous se tae on ante rior region. Cirrus II (Fig.2G) with subequal rami, a nterior ra mu s with more s etae than Bol. Mus. Nac., N.S., Zoo!., Rio de Janeiro, n.425, p.I-19, ago.2000

NEW RECORDS OF VERRUCOMORPI-IA OFF RIO GRANDE DO SUL, BRAZIL

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posterior ramus. Protopod of cirrus II with numerous setae on anterior region. Cirrus III to VI with essentially equal rami. Proxima l articles of cirrus III with numerous setae on a nterior region, ante rior ramus with more setae than posterior. Distal articles of cirrus III and all a rticles of cirrus IV to VI (Fig_2H) with three pairs of setae on anterior margin, and one large and two small setae on posterodista l angle, length of article about twice its width_ Caudal appendage (Fig_21) mu ltiarticulated, lo ng. three times the length of protopod of cirrus VI; articles covered by num erous setae on its distal margins. Penis with setae on distal h alf. Number of articles of cirri and caudal a ppendages as in table 1. Remarks - PILSBRY (1916) distinguis hed C. calotheca and C. flavidula by the following characteris tics: presence or absence of lon gitudina l ridges on scutum; ratio of first articular ridge of carina a nd rostrum to the other articular ridges of these plates; ratio of the anterior to the posterior rami of cirri I and II; ratio of the caudal appendage to the protopod of cirrus VI (Tab.2)_ The specime n s of th is sample we re identified as C. calotheca because the longitudinal ridges of the scutum we re s lightly developed, and the ratio of the anterior rami to the posterior rami of cirri I and II were equal to the ratios described by PILSBRY (1907; 1916) (Tab_2)_ However, in specimens analyzed in this work, the thickness of the articular ridges of the carina and rostrum varied from subequal to different.

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Fig. 1- Costatouerruca calotheca (Pilsbry, 1907): (Al carino-rostral vietV; (8) flXed-scutum and ftxed- tergum view; (C-D) tergum and scutum, internal view. Bar: 1mm. 8 01. Mus. Nac., N.S., Zoo!. , Rio de Janeiro, n.42S, p. l -1 9, ago.2000

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S.N.BRANOAo

In the specimens described by PILSBRY (1916), the ratio of the caudal appendage to the protopod of cirrus Vl is slightly larger than 1 (Tab.2). The specimens studied in this work had a ratio equal to 2 . Distribution - Indo-Malasyan waters, latitude and longitude unknown (315 to 832m); Northwestern Atlantic, 30' 44'N - 79'26W (Georgia, USA, 809m); Southwestern Atlantic, 32°S - 50''W (Rio Grande do SuI, Brazil, 520m - fIrst record) .

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Fig.2- Costatovem.