REPORT OF SCYLLARUS CHACEI HOLTHUIS, 1960 (DECAPODA, SCYLLARIDAE) IN AMAPÁ STATE CONTINENTAL SHELF OF BRAZIL

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REPORT OF

SCYLLARUS CHACEI

HOLTHUIS, 1960 (DECAPODA,

SCYLLARIDAE) IN AMAPÁ STATE CONTINENTAL SHELF OF BRAZIL

BY

K. C. A. SILVA1), C. H. J. M. FRANSEN2,5), M. RAMOS-PORTO3), K. S. PAIVA1), I. H. A. CINTRA1)and R. CRUZ4)

1₎_{Instituto Socioambiental e dos Recursos Hídricos, Universidade Federal Rural da Amazônia,}

Av. Presidente Tancredo Neves, 2501, Montese, Belém, PA, Brazil

2₎_{Department of Marine Zoology, Netherlands Centre for Biodiversity Naturalis,}

P.O. Box 9517, NL-2300 RA Leiden, The Netherlands

3₎_{Universidade Federal Rural de Pernambuco, Departamento de Pesca e Aquicultura,}

Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, Brazil

4₎_{PVE-CAPES, Instituto de Ciências do Mar, Av. da Abolição, 3207, Meireles Fortaleza,}

Universidade Federal do Ceará, Brazil

ABSTRACT

The lobster Scyllarus chacei Holthuis, 1960, a species of the family Scyllaridae Latreille, subfamily Scyllarinae Latreille, is reported for the first time from the continental shelf of Amapá State, Brazil. The female specimen was collected on September 31, 2010, at 72 m depth in the shrimp fishing zone of Amapá State (03°53′N 50°19′W), on a muddy bottom. The present record extends the geographic range known for this species in Brazil to the North.

RESUMO

A lagostaScyllarus chaceiHolthuis, 1960, pertencente à família Scyllaridae Latreille, subfamília Scyllarinae Latreille, é relatada pela primeira vez na plataforma continental do Estado de Amapá, Brasil. O espécime, uma fêmea, foi coletado em 31 de setembro de 2010, a 72 m de profundidade, na zona de pesca de camarão, no estado do Amapá (03°53′N 50°19′W), em fundo de lama. O atual registro amplia o conhecimento da área de ocorrência dessa espécie no Norte do Brasil.

INTRODUCTION

The infraorder Achelata Scholtz & Richter, 1995, comprises around 140 recent

marine species in two families: (1) the Palinuridae Latreille, 1802, with 55 species,

and (2) the Scyllaridae Latreille, 1825, with 85 species (De Grave et al., 2009).

5₎_{e-mail: Charles.Fransen@NCBNaturalis.nl}

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The family Scyllaridae consists of four subfamilies comprising 20 recent genera.

The Indo-Pacific Scyllarinae were revised by Holthuis (2002) who erected 13 new

genera for the 41 Indo-Pacific species of

Scyllarus

Fabricius, 1775. The genus

Scyllarus

s.s. is now restricted to the Atlantic Ocean comprising 9 species of which

4 have been recorded from Brazilian waters:

Scyllarus americanus

(S. I. Smith,

1869),

S. depressus

(S. I. Smith, 1881),

S. chacei

Holthuis, 1960, and

S. ramosae

Tavares, 1997 (see Tavares, 1997; Melo, 1999; Coelho et al., 2007; Dall’Occo et

al., 2007).

In this study we report upon a specimen of

Scyllarus chacei

that was caught

during shrimp trawling along the coast of Amapá State, Brazil. This is the first

record of the species from Amapá State.

MATERIAL AND METHODS

The specimen was collected during surveys conducted by the shrimp fleet

in the north coast of Brazil (fig. 1). The shrimp fishery is carried out using a

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shrimp trawling net at depths between 16 and 97 m, capturing the target species

Farfantepenaeus subtilis

(Pérez-Farfante, 1967) and

Farfantepenaeus brasiliensis

(Latreille, 1817) and associated fauna comprising fish and invertebrates. The

collecting position was obtained using the ArcGis (ESRI, 2008) software. On

board, biological material was packed in suitable containers and stored in a

refrigerating chamber.

In the Carcinology Laboratory, Center for Research and Management of

Fish-eries Resources of the North Coast (CEPNOR/IBAMA), the specimen was

ana-lyzed and photographed. For morphometric measurements, total length (TL) was

taken to be the distance between the rostrum and the posterior edge of the telson,

whereas carapace length (CL) was measured as the distance between the rostrum

and the posterior edge of the carapace.

The eggs of the female were counted by the following methodology: eggs

attached to pleopods were removed with tweezers, sodium hypochlorite 2%

active chlorine was used for separating eggs. Eggs were stored in 70% ethanol

and counted under a stereomicroscope. The specimen was preserved in 70%

ethyl alcohol and stored in the carcinological collection of the laboratory of the

EPNOR/IBAMA under registration number 44.3.1-A.

SYSTEMATIC ACCOUNT

Family S

CYLLARIDAE

Latreille, 1825

Subfamily S

CYLLARINAE

Latreille, 1825

Scyllarus

Fabricius, 1775

Scyllarus chacei

Holthuis, 1960

(figs. 2, 3)

Scyllarus americanus— Bouvier, 1925: 448-450, pl. 7 fig. 3 (notS. americanus(S. I. Smith, 1869). Scyllarus chaceiHolthuis, 1960: 152; Coelho, 1966: 139; 1971 [for 1967-1969]: 231; 1981: 14, fig. 1a-g; Coelho & Ramos, 1972: 158; Fausto-Filho, 1979: 49; Coelho & Ramos-Porto, 1980: 137; 1991 [for 1983-1985]: 59; 1994-1995: 117; 1998: 388; Coelho et al., 1980: 63, 65, 125; 1986: 85; 1989: 25; 2007: 7; Melo, 1999: 458, 459, figs. 309, 310; Dall’Occo et al., 2007: 48. Material examined. — 1 ovigerous female, TL 30.3 mm, CL 14 mm, total weight 12.44 g; Brazil, shrimp fishing zone of Amapá State, 03°53′N-50°19′W; 72 m depth; shrimp trawl; muddy bottom; 31.ix.2010.

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Fig. 2.Scyllarus chaceiHolthuis, 1960. Left, ventral and dorsal view of berried female; right, same, close up of carapace. This figure is published in colour in the online edition of this journal, which

can be accessed via http://booksandjournals.brillonline.com/content/15685403.

1969: 9 specimens (RMNH D 26027), off Venezuela, 9°36′N 60°10′W, 30.vi.1969, R.V. “John Elliot Pillsbury” Sta. 835.

Diagnosis. — Fourth antennal segment without additional ridge. Exopod of

third and first maxilliped without flagellum; flagellum of second maxilliped

trans-Fig. 3.Scyllarus chaceiHolthuis, 1960. Pre-hatching eggs showing eyes as oval black dots. This figure is published in colour in the online edition of this journal, which can be accessed via

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formed to single laminate segment. Orbits on anterior margin of carapace, some

distance from anterolateral angle. Body not depressed, rather high and vaulted.

Lat-eral margin of carapace with shallow cervical and postcervical incisions. LatLat-eral

margin of carapace with numerous squamiform tubercles. Pregastric tooth broadly

rounded. Gastric and cardiac teeth of carapace prominent and acute. Two distinct

grooves between posterior marginal groove and posterior margin of carapace. Fifth

leg of female with chela. First to fourth abdominal somites with shallow median

incision at posterior margin.

Eggs. — The fecundity was 758 eggs with an average diameters of 0.47

±

0.0112 mm (95% confidence limits), pale yellow in colour, at an advanced stage

of development, embryo eyes appear as oval black dots (fig. 3).

Distribution. — Known from the western Atlantic from North Carolina to

the Gulf of Mexico, Central America, Antilles, Surinam, Venezuela, and Brazil.

According to Coelho et al. (2007),

S. chacei

is presently known from Pará, Ceara,

Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Sergipe, Bahia, and Rio

de Janeiro States of Brazil. Dall’Occo et al. (2007) added a record from Espírito

Santo. This is the first record for the species from Amapá State, on the northern

shelf of Brazilian waters. The species has been found in depths between 10 and

330 m.

Remarks. — The present specimen has: (1) a broadly rounded pregastric tooth

on the carapace whereas this is usually bilobed in

S. americanus

, and more acute

in

S. depressus

; (2) the 1

st

_{to 4}

th

_{abdominal somites with a shallow median incision}

at the posterior margin whereas this incision is deep and narrow in

S. americanus

and

S. depressus

; (3) two distinct grooves between the posterior marginal groove

of the carapace and the posterior margin whereas there is only a single groove

in

S. americanus

and no groove in

S. depressus

; (4) the gastric and cardiac teeth

of the carapace prominent and acute where as it are low and inconspicuous in

S. planorbis

; and (5) lacks the additional ridge on the fourth antennal segment which

is well developed in

S. ramosae

.

ACKNOWLEDGEMENTS

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exchange between researchers, and the Fishing Engineer Francisco Estevam

Mar-tins Neto for their dedication in the measurement of lobster eggs. We would also

like to extend our special thanks to Dr. J. C. von Vaupel Klein for his assistance

and unconditional support during the preparation of the manuscript.

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