Changes in nymphal morphometric values and tarsal microstructures during postembryonic development in the Neotropical harvestman Heteromitobates albiscriptus (Opiliones: Gonyleptidae)

Changes in nymphal morphometric values and tarsal microstructures during postembryonic development in the Neotropical harvestman Heteromitobates albiscriptus (Opiliones: Gonyleptidae)

Author Ramin, Alessandra Z. Google Scholar
Willemart, Rodrigo Hirata Autor UNIFESP Google Scholar
Gnaspini, Pedro Google Scholar
Abstract The postembryonic development of Opiliones (Arachnida) includes three phases: larval, nymphal (with four to eight instars), and adult (when molts cease). The present study aimed to describe the postembryonic development of Heteromitobates albiscriptus (Mello-Leitao, 1932) (Gonyleptidae) including both a morphometric study and SEM analysis of two structures present in the tarsus of nymphs and adults: the "tarsal aggregate pores" (TAPs) and the "tarsal perforated organ" (TPO). The nymphal phase includes five stages, which can be easily recognized by morphometric values. In contrast to the pectinate tarsal claws found in legs III-IV of adults (the main synapomorphy of the genus Heteromitobates in the subfamily Goniosomatinae), nymphs bear smooth claws. First nymphs lack TAPs and TPOs. TAPs seem to have a precisely defined position in both prolateral and retrolateral faces of the tarsus. The number of pores in TAPs grows from three or four among second nymphs to around 20 among adults, and measure around 2.15 mu m in diameter with no clear difference between ages. An additional field of pores on legs III-IV ("ventral tarsal aggregate pores" vTAPs) was detected only among adults. The plates at the base and the apex of the TPOs differ from the ones in between. The length of the TPO and its number of plates increase with each molt. However, there is no discernible pattern of growth throughout the postembryonic development when taking into account both the average size of the plates (ranging between similar to 7-11 mu m) and the ratio of TPO length to tarsus length.
Keywords Morphology
glandular opening
Gonyleptidae
Goniosomatinae
ontogeny
xmlui.dri2xhtml.METS-1.0.item-coverage College Park
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 2010/08630-5
FAPESP: 1999/07943-9
CNPq: 304534/2007-2
CNPq: 304272/2010-8
Date 2016
Published in Journal Of Arachnology. College Park, v. 44, n. 3, p. 330-346, 2016.
ISSN 0161-8202 (Sherpa/Romeo, impact factor)
Publisher Amer Arachnological Soc
Extent 330-346
Origin http://dx.doi.org/10.1636/M15-83.1
Access rights Closed access
Type Article
Web of Science ID WOS:000388483600003
URI https://repositorio.unifesp.br/handle/11600/56832

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