Chromosomal data of two pholcids (Araneae, Haplogynae): A new diploid number and the first cytogenetical record for the New World Clade


Autoria(s): de Araujo, D.; Brescovit, A. D.; Rheims, C. A.; Cella, D. M.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/01/2005

Resumo

Mesobolivar luteus (Keyserling 1891) and Micropholcus fauroli (Simon 1887) specimens were collected in Ubatuba and Rio Claro, both in the state of São Paulo, Brazil. Mesabolivar luteus showed 2n (male) = 15 = 14 + X and 2n (9) = 16 = 14 + XX in mitotic metaphases and 711 + X in diplotenic cells. During late prophage 1, all bivalents presented a ring shape, evidencing two chiasmata per bivalent. In this species, some diplotenic cells appear in pairs, maybe due to specific characteristics of the intercellular bridges. The metaphases 11 showed n = 7 or n = 8 = 7 + X chromosomes. Micropholcus fauroti evidenced 2n (male) = 17 = 16 + X in spermatogonial metaphases and 8II+X in diplotenic cells, with only one chiasma per bivalent, contrasting with M. luteus. In both species, all chromosomes were metacentrics. The sexual chromosome X was the largest element and appeared as a univalent during meiosis I. These are the first cytogenetical data for the genera Mesabolivar and Micropholcus. Additionally, M. luteus is the first chromosomally analyzed species of the New World clade and the observed diploid number for M. fauroti had not yet been recorded in Pholcidae.

Formato

591-596

Identificador

http://dx.doi.org/10.1636/04-105.1

Journal of Arachnology. College Park: Amer Arachnological Soc, v. 33, n. 2, p. 591-596, 2005.

0161-8202

http://hdl.handle.net/11449/19423

10.1636/04-105.1

WOS:000234013200044

Idioma(s)

eng

Publicador

Amer Arachnological Soc

Relação

Journal of Arachnology

Direitos

closedAccess

Palavras-Chave #Arachnida #Meiosis #chromosomal morphology #spider #diplotene pair
Tipo

info:eu-repo/semantics/article