Meiotic chromosomes of a lynx spider species Oxyopes javanus Thorell (Araneae : Oxyopidae)

Date

3-1986

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Oxyopes javanus Thorell is one of the most abundant hunting spiders found in Philippine agroecosystems. The predatory nature of the species renders it great potential as an effective natural control agent of rice and corn insect pests. Mounts of spermatocytial cells from penul-timate males were prepared using lacto-aceto-orcein squash technique to study the meiotic chromosomes. Cytological studies, gametic meiosis and meiotic index, were determined and described. Chromosome morpho-logy and behaviour were analyzed and illustrated. The diploid chromosome number in the male was found to be 2n=19. Instead of an XXXX-XX00 sex determining mechanism described by Foelix (1982) for most spiders, C. javanus exhibited the XX-XO type occuring in most Hemipterans. The karyotypic formula is inferred to be n=9II+X or 2n=18A+XO. The spermatocytes produced were either A+X or A+0. The chromosomes during the prophase I stages exhibited banding patterns, pairing configurations, chiasmata and terminalization. Multivalent configurations were also observed. Kinetochore activity was least determined.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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