Photonectes, Prokofiev & Klepadlo, 2019

Prokofiev, Artem M. & Klepadlo, Cynthia, 2019, Two new species of Photonectes with blue luminous tissue on body, and a re-examination of P. mirabilis (Teleostei: Stomiidae), Zootaxa 4590 (2), pp. 270-282: 280

publication ID

https://doi.org/10.11646/zootaxa.4590.2.4

publication LSID

lsid:zoobank.org:pub:5BB7CA86-65F1-4F1E-854C-02F9DAA7A1E5

DOI

http://doi.org/10.5281/zenodo.5924193

persistent identifier

http://treatment.plazi.org/id/03B81E52-FFC4-FFD2-FF5D-6340FA1CF857

treatment provided by

Plazi

scientific name

Photonectes
status

 

Key for identification of the species of Photonectes   with blue luminous tissue on body

1a Barbel expanded toward tip, lacking bulbs or whip-like unpigmented terminal appendage, but unpigmented and apparently luminous in distal portion ( Fig. 1G View FIGURE 1 ); blue luminous tissue consisting of a longitudinal row of interrupted streaks on each side above IV photophores, and transverse interrupted streaks connecting longitudinal lines of left and right sides of body between photophores of ventral rows, alternating with photophores ( Fig. 1C View FIGURE 1 ); lateral longitudinal band of blue tissue diffuse and irregular ( Fig. 1D View FIGURE 1 ), not extending anteriad from vertical of pelvic-fin origin............................ P. cyanogrammicus  

1b Barbel with bulb(s) and/or unpigmented whip-like terminal appendage twice or more narrower than the pigmented stem of barbel; blue luminous tissue of different arrangement........................................................... 2

2a Solid longitudinal band of blue luminous tissue present on flanks between gill opening and caudal-fin base ( Fig. 9A View FIGURE 9 )...... 3

2b No such band........................................................................................ 4

3a Barbel lacking bulb, with thin unpigmented terminal filament splitting on tip into three short filaments; barbel not exceeding eye in length................................................................................. P. gracilis  

3b Barbel with large spherical bulb bearing thin solidly pigmented terminal filament splitting on tip into four short filaments; barbel much longer than eye................................................................. P. sphaerolampas  

4a Barbel with several bulbs of different size and a short dorsal branch ( Fig. 7 View FIGURE 7 ); blue luminous tissue on body consisting of a pair of longitudinal lines between IP photophores and a longitudinal row of spots (sometimes confluent into line) on each side above PV photophores; 3 pairs of spots of luminous tissue inside mouth ( Figs. 6C, 6D View FIGURE 6 ) and a spot above last BR photophore ( Fig. 6F View FIGURE 6 )................................................................................... P. mirabilis  

4b Barbel with a single large bulb or without bulbs; blue luminous tissue on body of different arrangement; no luminous spots inside mouth and on branchiostegal membrane (except P. achirus   ).............................................. 5

5a Blue luminous tissue consisting of a pair of lines along midline of isthmus ( Fig. 9B View FIGURE 9 ), running outward of IP photophores at 1 st –2 nd organs of this series and disappearing above the last IP photophores.............................. P. venetaenia  

5b Blue luminous tissue consisting of a midventral chevron-shaped stripe between PV photophores with short transverse streaks alternating with photophores, and a row of spots on each side above PV photophores ( Fig. 9C View FIGURE 9 )....................... 6

6a Barbel with large bulb, a pair of luminous spots inside mouth and a patch of luminous tissue in front of BR-1; BR 6–8.................................................................................................. P. achirus  

6b Barbel without bulb, no luminous spots inside mouth, no patch of luminous tissue in front of BR-1; BR 8–10..................................................................................................... P. caerulescens