Aspectos anatômicos e funcionais do aparelho reprodutor de Parastacus brasiliensis (von Martens) (Crustacea, Decapoda, Parastacidae)

Abstract

ABSTRACT. ANATOMICAL ANO FUNCTIONAL ASPECTS OF TIIE REPROOUCTIVE SYSTEM OF PARASTACUS BRASILlENSIS(VON MARTENS) (CRUSTACEA, DECAPOOA, PARASTACIDAE).The absence of morphological external characteristics that allow the recognition ofthe sex as well as the presence of both male and female gonopores in the sarne animal [except in some sexual forms of Paras/aeus nieoleti (Phil ippi, l882)] gives rise to the hypothetical existence of some form of hermaphroditism in crayfishes belonging to the genus Paras/aeus Huxley, 1879. Specimens of Paras/aeus brasiliensis (von Martens, 1869) were collected in a rivulet at Mariana Pimentel munic ipality, Rio Grande do Sul, Brazil. ln the laboratory they were reared and dissected. The results suggest that P. brasiliensis may be a sequential herlllaphroditic species, but male and female gonadal tissues were not silllultaneously present in the analized samples. ln testes and ovaries two pairs of genital ducts are present; that connect, respectively, to the gonopores on the coxae ofthe fifth and the third pairs ofpereiopods.ln the fema les on ly the apertures and anterior ducts seelll to be functional , while in the males only the apeltures and posterior ducts may be functional. The existence of difTerent degrees of obstruction in the fema le genital apertures and different degrees of projection in the male genital apertures was observed. The aspect of the gonopores were used to recognize, externally, the sex of animaIs. KEY WORDS. Parastac idae, Paras/aeus, brazi lian crayfish, reproductive system, hermaphroditism A família Parastacidae inclui os crustáceos límnicos conhecidos pela designação popular de "lagostins de água doce" do Hemisfério Sul, com representantes atuais em Madagascar, Oceania e América do Sul (Região Neotropical) (HOBBS 1988). Neste último continente, a família está representada pelos gêneros Parastacus Huxley, 1879 e Samastacus Riek, 1971. O gênero Parastacus inclui oito espécies, das quais seis ocorrem em território brasileiro, com urna di stribuição restrita aos estados do Rio Grande do Sul e Santa Catarina (BUCKUP & ROSSI1980).A importância de seu estudo está relacionada, entre outros aspectos, com a sua potencialidade para programas de carci nicul tura, pois trata-se de um grupo de espécies inteiramente adaptado às condições cl imáticas e limnológicas do Brasil meridional, tendo condições de repetir o sucesso já alcançado com o cul tivo de lagostins no Hemisfério Norte. Na América do Sul , entretanto, o cul tivo do lagostim ainda não foi tentado. Alega-se falta de informações sobre algumas bases biológicas essenciais para iniciativas zootécnicas, em especial sobre seu ciclo reprodutivo.

Occurrence of Protandric Hermaphroditism in a Population of the Neotropical Freshwater Crayfish Parastacus Brasiliensis (Parastacidae)

“…Carapace length (CL) was measured from the anterior tip of the rostrum to the posterior margin of the carapace. The sex of the animals was determined following Almeida and Buckup (1997).…”

“…and P. pilimanus (von Martens, 1869) (Rudolph, personal communication), intersexuality is not associated with the existence of hermaphroditism. Almeida and Buckup (1997) studied the reproductive system of P. brasiliensis (von Martens, 1869). The existence of two pairs of genital ducts in testes and ovaries was verified: an anterior pair (oviducts) that connect to the female gonopores located in the coxopodites of the third pair of pereiopods, and a posterior pair (vasa deferentia) that connect to the male gonopores located in the coxopodites of the fifth pair of pereiopods.…”

Intersex females in the red claw crayfish, Cherax quadricarinatus (Decapoda: Parastacidae)

“…The presence of male and female intersexes has been reported for the South American parastacids Parastacus pugnax Poeppig, 1835, P. varicosus Faxon, 1898, P. pilimanus von Martens, 1869, P. defossus Faxon, 1898, P. saffordi Faxon, 1898, Samastacus spinifrons Phillipi, 1882 (Almeida and Buckup 2000, Rudolph and Almeida 2000, Rudolph et al 2001, Rudolph 2002 and Virilastacus Hobbs, 1991 (Retamal andRudolph 2005) including permanent or partial protandric hermaphroditism (Rudolph 1995, Almeida and Buckup 1997, Almeida and Buckup 2000, Rudolph and Almeida 2000, Rudolph 2002, Retamal and Rudolph 2005, but not for the Australian, Madagascar and New Zealand parastacids which are mainly gonochoristic (except for C. quadricarinatus).…”

Ludwig Buckup’s academic life and his contribution to Carcinology

“…Several articles published by his research group constitute an essential basis for the continuation of research on Neotropical biota. The family Parastacidae was extensively investigated by his research group (Fontoura and Buckup, 1989a;1989b;1991;Buckup and Rossi, 1993;Buckup and Bond-Buckup, 1994;Almeida and Buckup, 1997; Buckup, 1957 Agroecus brevicornis Buckup, 1957 Reduviidae Apiomerus riograndensis Buckup, 1957 Crustacea Isopoda Dubioniscidae Novamundoniscus meridionalis (Araujo & Buckup, 1994) Philosciidae Benthana taeniata Araujo & Buckup, 1994 Platyarthridae Trichorhina acuta Araujo & Buckup, 1994 Trichorhina bicolor Araujo & Buckup, 1996 Decapoda Aeglidae Aegla camargoi Buckup & Rossi, 1977 Aegla franciscana Buckup & Rossi, 1977 Aegla leptodactyla Buckup & Rossi, 1977 Aegla plana Buckup & Rossi, 1977 Aegla serrana Buckup & Rossi, 1977 Aegla grisella Bond- Aegla inconspicua Bond- Aegla inermis Bond- Aegla intercalata Bond- Aegla itacolomiensis Bond- Aegla jarai Bond- Aegla lata Bond- Aegla leptochela Bond- Aegla ligulata Bond- Aegla longirostri Bond- Aegla marginata Bond- Aegla microphthalma Bond- Aegla obstipa Bond- Aegla parva Bond- Aegla ringueleti Bond- Aegla rossiana Bond- Aegla septentrionalis Bond- Aegla spinipalma Bond- Aegla spinosa Bond- Aegla violacea Bond-Buckup & Buckup, 1994 Aegla pomerana Bond- Aegla muelleri Bond- Aegla renana Bond- Aegla leachi Bond- Buckup & Buckup, 2012 Aegla lancinhas Bond- Buckup & Buckup, 2015 Parastacidae Parastacus laevigatus Buckup & Rossi, 1980 Parastacus fluviatilis Ribeiro & Buckup, 2016 2000; Horn et al, 2004;Vinagre et al, 2004;Reid et al, 2006;Buckup et al, 2007b;2007c;Noro et al, 2007;Noro and Buckup, 2010;SilvaCastiglioni et al, 2010). From 1979 on, he published several articles about the family Aegli...…”