First evidence for temporary and permanent adhesive systems in the stalked barnacle cyprid, Octolasmis angulata.
Although there have been extensive studies on the larval adhesion of acorn barnacles over the past few decades, little is known about stalked barnacles. For the first time, we describe the larval adhesive systems in the stalked barnacle, Octolasmis angulata and the findings differ from previous reports of the temporary (antennulary) and cement glands in thoracican barnacles. We have found that the temporary adhesives of cyprid are produced by the clustered temporary adhesive glands located within the mantle, instead of the specialised hypodermal glands in the second antennular segment as reported in the acorn barnacles. The temporary adhesive secretory vesicles (TASV) are released from the gland cells into the antennule via the neck extensions of the glands, and surrounded with microtubules in the attachment disc. Cement glands undergo a morphological transition as the cyprid grows. Synthesis of the permanent adhesives only occurs during the early cyprid stage, and is terminated once the cement glands reach maximum size. Evidence of the epithelial invaginations on the cement glands supports the involvement of exocytosis in the secretion of the permanent adhesives. This study provides new insight into the larval adhesives system of thoracican barnacles.
Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Fook Choy
FC
Yap
Department of Biological Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900, Kampar, Perak, Malaysia.
Wey-Lim
WL
Wong
Microbes &Pathogen Biology, The Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, BT9 7BL, UK.
Aaron G
AG
Maule
Microbes &Pathogen Biology, The Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, BT9 7BL, UK.
Gerard P
GP
Brennan
Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Ving Ching
VC
Chong
Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Lee Hong Susan
LH
Lim
D000269:Adhesives / Q000737:chemistry*; D000818:Animals; D059001:Aquatic Organisms / Q000737:chemistry / Q000378:metabolism; D001685:Biological Factors / Q000737:chemistry* / Q000378:metabolism; D005088:Exocrine Glands / Q000378:metabolism / Q000648:ultrastructure; D001468:Thoracica / Q000737:chemistry* / Q000378:metabolism
D000269:Adhesives; D001685:Biological Factors