The two species differ in the number of vertebrae and light-producing photophores
that cover a large part of their body.
Bristlemouths share the signature characteristics of many twilight-zone fish: large eyes adapted to the dark, luminous photophores
, a gaping, tooth-filled jaw--and a name that sparks the imagination.
With oval or elongate ventrally protruding eyes (width slightly greater than lens diameter) with thick, golden reflective tissue covering a ventral structure, possibly a photophore
at base of eye (Fig.
It also had a different number and distribution of photophores
, which are the tiny cup-shaped organs that give lanternsharks the ability to glow.
Biophysicist Alison Sweeney of the University of Pennsylvania had hypothesized that the cells, called photophores
, act like microscopic cables that channel the bioluminescent glow of the squid down or out in a specific direction.
Among these, Myctophidae is the dominant family (Nafpaktitis et al., 1977) and the most speciose, including almost 250 species referred to as lanternfish due to a variety of luminous organs, among which photophores
are the most characteristic (Nelson, 2006).
The intestinal photophore
was visible only in some individuals because most specimens were in poor condition.
Note the numerous sharp teeth and the frontal fishing rod-like appendage, bearing a photophore
at its tip to attract prey.
scolopes, the little cuttlefish (or Atlantic bobtail squid), Sepiola atlantica Orbigny, (1839-1842) have a photophore
(light organ), it is small (reaching up to 21 mm in dorsal mantle length (DML)), and is widely distributed in the northeastern Atlantic from 65[degrees]N to 35[degrees]N from Iceland, the Faroe Islands, and western Norway in the north to Morocco in the south (Yau & Boyle 1996, Collins et al.
To stud at 4 years and dam of: Million Waves (03 f Mull Of Kintyre; Listed-placed winner), Million Spirits (04 f Invincible Spirit; winner), Photophore
(05 f Clodovil; winner), Elusive Wave (06 f Elusive City; Classic winner), Wealdmore Wave (07 c Oratorio; winner).
bioluminescence is conspicuous and may communicate to predators that the squid is alert and aware of its presence, thereby forestalling an attack (Young et al., 1982).
The two were chosen to provide a range of photophore