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Titolo:
Multifunctions of the upper lip and a ventral reflecting organ in a bioluminescent ostracod Vargula hilgendorfii (Muller, 1890)
Autore:
Abe, K; Ono, T; Yamada, K; Yamamura, N; Ikuta, K;
Indirizzi:
Univ Shizuoka, Dept Life & Earth Sci, Shizuoka 422, Japan Univ Shizuoka Shizuoka Japan 422 t Life & Earth Sci, Shizuoka 422, Japan Kochi Univ Technol, Dept Environm Syst Engn, Kochi 782, Japan Kochi Univ Technol Kochi Japan 782 Environm Syst Engn, Kochi 782, Japan
Titolo Testata:
HYDROBIOLOGIA
, volume: 419, anno: 2000,
pagine: 73 - 82
SICI:
0018-8158(200002)419:<73:MOTULA>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNCTIONAL-MORPHOLOGY; IRIDESCENT COPEPODS; MYODOCOPIDA; CRUSTACEA; PATTERNS; POECILOSTOMATOIDA; ULTRASTRUCTURE; PHYLOGENY; BEHAVIOR;
Keywords:
reflecting organ; upper lip; Myodocopa; chemical cues; evolution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
K. Abe et al., "Multifunctions of the upper lip and a ventral reflecting organ in a bioluminescent ostracod Vargula hilgendorfii (Muller, 1890)", HYDROBIOL, 419, 2000, pp. 73-82

Abstract

Multifunctions of the upper lip in a bioluminescent myodocopid Vargula hilgendorfii were studied by video observation and histological method. The localization of luciferin and luciferase gland cells within the upper lip waspartly successful. Two long protrusions of the upper lip, both of V. hilgendorfii and a non-luminescent species of the same family, immediately anterior to the mouth, were found to show very flexible movement especially while eating, as if smearing on the food surface a secretion from the protrusions (glands), which may support the hypothesized secretion of digestive enzymes from the upper lip. This hypothesis is further supported by the new finding of a pair of ducts which connect the basal part of the upper lip with the posterior digestive duct (stomach). Comparative studies of V. hilgendorfii with several sympatric non-luminescent species of the same family have also revealed that it has a characteristic reflecting organ immediately posterior to the anus. It is a conical small protrusion, as if dangling from the ventral edge of the abdomen at the apex of the cone. It is observable only in live specimens, when the furca, which is located outwardly to the organ, is sufficiently transparent. When illuminated, the reflecting organ reflects the distinct light. The diameter of the mirror (chemical composition provisionally analyzed) is about 6-8% of the carapace length. The organ develops from the very first stage of its ontogeny without reference to sex, which suggests that the function may be related to intraspecific signaling or predatory deterrence.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 09:31:39