The diploid chromosome number 2 n = 16 has been established in both sexes of the harpacticoid copepod Tisbe biminiensis. The chromosomes are metacentric or sub-metacentric, and differentiated sex chromosomes are not present. Chiasmatic metaphase bivalents occur in the male. In the female, after the diffuse stage the homologues separate but remain juxtaposed to each other till metaphase I. The diploid chromosome numbers so far reported for species of the genus Tisbe are 24. The phylogenetic meaning of the different chromosome numbers in Tisbe is briefly discussed.
Referenze Bibliografiche
[1] A. H. AR-RUSHDI (1963) - The cytology of achiasmatic meiosis in the female Trigriopus (Copepoda), «Chromosoma», 13, 526-539.
[2] B. BATTAGLIA (1970) - Cultivation of marine copepods for genetic and evolutionary research, «Helgoländer wiss. Meeresunters», 20, 385-392.
[3] G. BATTAGLIA e B. VOLKMANN-ROCCO (1969) - Gradienti di isolamento riproduttivo in popolazioni geografiche del copepode Tisbe clodiensis «Atti Istituto Veneto di Scienze, Lettere ed Arti», 127, 371-381.
[4] B. BATTAGLIA e B. VOLKMANN-ROCCO (1973) - Geographic and reproductive isolation in the marine Harpacticoid Copepod Tisbe, «Marine Biology», 19, 156-160.
[5] C. BOCQUET (1951) - Recherches sur Tisbe reticulata, «Arch. de Zool. exp. gén.», 87, 335-416.
[6] D. COLOMBERA e I. LAZZARETTO-COLOMBERA (1972) - The karyology of Tisbe reluctans (Copepoda, Harpacticoida), «Caryologia», 25, 525-529.
[7] D. COLOMBERA e I. LAZZARETTO-COLOMBERA (1975) - Ultrastructure of distant paired homologues in oocyte of Tisbe holothuriae (Copepoda), «Experientia», 31, 225-227.
[8] P. KRÜGER (1911) - Beitrage zur Kenntnis der Oogenese bei Harpacticiden, nebst biologischen Beobachtungen, «Arch. f. Zellforschung», 6, 165-189.
[9] J. P. HARDING (1950) - Cytology, genetics and classification, «Nature», 166, 769-771.
[10] G. HEBERER (1938) - Analyse der Gemini von Heterocope weismanni IMHOF (= H. borealis Fischer), «Biol. Zbl.», 58, 343-356.
[11] I. LAZZARETTO-COLOMBERA (1976) - Chromosome number in ten species of the genus Tisbe. Marine biology (in stampa).
[12] B. VOLKMANN-ROCCO (1972) - Species of Tisbe (Copepoda, Harpacticoida), from Beaufort, North Carolina, «Archo Oceanogr. Limnol.», 17, 223-258.
[13] B. VOLKMANN-ROCCO (1973) - Etude de quatre espèces jumelles du groupe Tisbe reticulata Bocquet (Copepoda, Harpacticoida), «Arch. Zool. exp. gén.», 114, 317-348.
[14] B. VOLKMANN-ROCCO e G. FAVA (1969) - Two sibling species of Tisbe (Copepoda, Harpacticoida): Tisbe reluctans and T. persimilis n. sp. Research on their morphology and population dynamics, «Marine Biology», 3, 159-164.
[15] B. VOLKMANN-ROCCO e B. BATTAGLIA (1972) - A new case of ibling species in the genus Tisbe (Copepoda, Harpacticoida), «Proc. V.E.M.B.S.», Piccin, Padova, 68-80.
Con il contributo del Ministero per i Beni e le Attività Culturali