(pnits H e t y w t c s i t ) t tiv p . r w w t t II~IIK’V) itic.lri(las semitranspiirent species
poss(-ssiiig o r p ~ n s of Pcstii. whilcx t h c siil)prniix Sergia (a dintinct genus
i i i this p i p ~ r )
iric*lutlcc: slwies id ;L uniforrn r d pigmentation, without
organs of I’t’HtiL, but it1 niiury viiws wit ti dertnal photophores whirh
rcwmblc thc sit I iiLtioti fo u lid i I I (*(.l.tii i t i I twnopc4agic. fishes. However.
t tic. o ( x w r ( w * c of su(*h scmii ribnsl);Ll.(’tlt s p i e s UH Bpryia lucems and
S . kzZi,smani 13:irt~i~rtl in t h~ Svrqin rhullPtegori grolip suggests that the
definition of RPrqicc must3 he tilt(wxi to itic~litde sotne species with only a
watt(bring of red chrotnut,o~hor.cs.
The verticd distributions of‘ t ti(. two gcincra are quite different.
I lie spec.irv of Srr!lPstcs arf’ rwtrichxl to depths above 700 m. whereas
LSurqin o(wrr froin nrtw t h c b R I I I ~ ; L C C to 1 500 m or more. There is a close
cmwlat,ion hctwwn certikiri iLssociiitd morphologiaal features and
tlcpt~h distributioik. ‘l’tiiit is, the. spcciw with lenrs-bearing dermal
photophores (8. c.hal1engrr.i group) inhihit, depths shallower than 700 m
like Rergestps spp. Among them, those that appear near the surface
;It, night tire semit8ranspiwent, while others have a more or less uniform
1)ignicntation. The all-red species with photophores of the lens-less
opaqucx spot ” type (8. robuslus group) are generally found between
,500 ;mi I 000 in, stid tliose without photophores (8. juponicus group)
iwe tlistributecl iri depths of 1 000 i n or grclater.
surfme of‘ t h body tlifK.rs iiot only specifically but also sexually
(I)enncll, [!)A5 ; Oinori, I U(I9iL). ‘l‘tir shape and arrangement of the
organs of I’(\StiL t i r ~ illso of qwt(>rit;itiv sigiiiticww at species group and
sperim I(~ve1s (Ifoxton, 19721~).
Obstwratiotid t ~ n d cq)eriirwntiiI (liltit relating to deoapod bioIiitnincwwicc IIW surprisingly s(~iiiit. ‘I%(* luminous secretion8 of Oplophorax spp. t i n t l Accinthpph!pi spp. h;iw easily been detected on deck
when captured. Howev~r, tdrwst iLll efforts to stimulate the photophores to twtivit.v liuvc. proved unsiic s~fiil thuR far (Harvey, I931 ;
I)etiticll, 1W5 : Ornori, 196!h). A scri~s of speotrophotometer testa has
wcently Iwtw (*iLrried out on tlirchc speries of shrimps to determine if
t h y redly Iurnincsc~c. Some iirtlividuitls of Sergiu Zucen.p and S. prehensiZia showc~d positive response when illuminated by light with a
wtivelcngt 11 of 460 nm, but (ientmlae purvus did not show any positive
indication (Ornori, unpublished). According to Terao (1917) who
described i n (letid the histology of the photophores of Sergia Zucens (as
Rurqmtes prphandis). the species emitted a dim. intermittent. greenishyellow light. I)en~ieIl ( I 955) confirmed the radiation of Oplophorw
spinosux ( i t s 0. !/riniuldii), Hgmenodoru yracilis, A‘ydellaspi.9 debilis.
i’wrupandnlrcs rkhnrdi itrid several s p e c k of S’ergeste8 and 6SCerp% : the
, l
6‘
1 7
I he iLrr;qytntwt of the lens-bciiring photophores on the ventral
poss(-ssiiig o r p ~ n s of Pcstii. whilcx t h c siil)prniix Sergia (a dintinct genus
i i i this p i p ~ r )
iric*lutlcc: slwies id ;L uniforrn r d pigmentation, without
organs of I’t’HtiL, but it1 niiury viiws wit ti dertnal photophores whirh
rcwmblc thc sit I iiLtioti fo u lid i I I (*(.l.tii i t i I twnopc4agic. fishes. However.
t tic. o ( x w r ( w * c of su(*h scmii ribnsl);Ll.(’tlt s p i e s UH Bpryia lucems and
S . kzZi,smani 13:irt~i~rtl in t h~ Svrqin rhullPtegori grolip suggests that the
definition of RPrqicc must3 he tilt(wxi to itic~litde sotne species with only a
watt(bring of red chrotnut,o~hor.cs.
The verticd distributions of‘ t ti(. two gcincra are quite different.
I lie spec.irv of Srr!lPstcs arf’ rwtrichxl to depths above 700 m. whereas
LSurqin o(wrr froin nrtw t h c b R I I I ~ ; L C C to 1 500 m or more. There is a close
cmwlat,ion hctwwn certikiri iLssociiitd morphologiaal features and
tlcpt~h distributioik. ‘l’tiiit is, the. spcciw with lenrs-bearing dermal
photophores (8. c.hal1engrr.i group) inhihit, depths shallower than 700 m
like Rergestps spp. Among them, those that appear near the surface
;It, night tire semit8ranspiwent, while others have a more or less uniform
1)ignicntation. The all-red species with photophores of the lens-less
opaqucx spot ” type (8. robuslus group) are generally found between
,500 ;mi I 000 in, stid tliose without photophores (8. juponicus group)
iwe tlistributecl iri depths of 1 000 i n or grclater.
surfme of‘ t h body tlifK.rs iiot only specifically but also sexually
(I)enncll, [!)A5 ; Oinori, I U(I9iL). ‘l‘tir shape and arrangement of the
organs of I’(\StiL t i r ~ illso of qwt(>rit;itiv sigiiiticww at species group and
sperim I(~ve1s (Ifoxton, 19721~).
Obstwratiotid t ~ n d cq)eriirwntiiI (liltit relating to deoapod bioIiitnincwwicc IIW surprisingly s(~iiiit. ‘I%(* luminous secretion8 of Oplophorax spp. t i n t l Accinthpph!pi spp. h;iw easily been detected on deck
when captured. Howev~r, tdrwst iLll efforts to stimulate the photophores to twtivit.v liuvc. proved unsiic s~fiil thuR far (Harvey, I931 ;
I)etiticll, 1W5 : Ornori, 196!h). A scri~s of speotrophotometer testa has
wcently Iwtw (*iLrried out on tlirchc speries of shrimps to determine if
t h y redly Iurnincsc~c. Some iirtlividuitls of Sergiu Zucen.p and S. prehensiZia showc~d positive response when illuminated by light with a
wtivelcngt 11 of 460 nm, but (ientmlae purvus did not show any positive
indication (Ornori, unpublished). According to Terao (1917) who
described i n (letid the histology of the photophores of Sergia Zucens (as
Rurqmtes prphandis). the species emitted a dim. intermittent. greenishyellow light. I)en~ieIl ( I 955) confirmed the radiation of Oplophorw
spinosux ( i t s 0. !/riniuldii), Hgmenodoru yracilis, A‘ydellaspi.9 debilis.
i’wrupandnlrcs rkhnrdi itrid several s p e c k of S’ergeste8 and 6SCerp% : the
, l
6‘
1 7
I he iLrr;qytntwt of the lens-bciiring photophores on the ventral