Lasiognathus
publication ID |
https://doi.org/ 10.1643/Ci-14-181 |
DOI |
https://doi.org/10.5281/zenodo.6103178 |
persistent identifier |
https://treatment.plazi.org/id/03D8A574-FF88-9B33-0908-F83553E4D258 |
treatment provided by |
Plazi |
scientific name |
Lasiognathus |
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KEY TO FEMALES OF THE SPECIES OF LASIOGNATHUS View in CoL View at ENA
1a. Escal hooks borne on a short, transverse, fanshaped, distal appendage (Bertelsen and Pietsch, 1996:404, fig. 2) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Lasiognathus beebei View in CoL Regan and Trewavas, 1932
1b. Escal hooks borne on an elongate, cylindrical, distal appendage _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2
2a. Escal bulb with a membranous anterior crest; prolongation of distal appendage absent ( Bertelsen and Pietsch, 1996:404, fig. 3) _ _ _ _ _ _ _ _ _ Lasiognathus View in CoL waltoni Nolan and Rosenblatt, 1975 View in CoL
2b. Escal bulb without a membranous anterior crest; prolongation of distal appendage present _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3
3a. A cylindrical, internally pigmented, anterior escal appendage arising from base of escal bulb; distal escal appendage with a pair of slender, filamentous prolongations ( Figs. 2 View Fig. 2 , 3 View Fig. 3 ) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Lasiognathus View in CoL dinema Pietsch and Sutton , new species
3b. Cylindrical, internally pigmented, anterior escal appendage absent; distal escal appendage with a single cylindrical or compressed prolongation _ _ _ _ _ _ 4
4a. Distal escal appendage with a short, cylindrical prolongation (length 5.2–8.6% SL) emerging ante- riorly from bases of escal hooks, without lateral serrations or filaments; posterior escal appendage cylindrical ( Bertelsen and Pietsch, 1996:405, fig. 4) _ _ _ _ _ _ _ _ _ Lasiognathus intermedius View in CoL Bertelsen and Pietsch, 1996
4b. Distal escal appendage with an elongate, com- pressed prolongation (length 2.9–20.8% SL) emerg- ing anteriorly from bases of escal hooks, bearing lateral serrations and/or tiny filaments on distal tip; posterior escal appendage broad, laterally compressed _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5
5a. Three darkly pigmented escal hooks; length of distal escal appendage 8.0–12.5% SL (in specimens ranging from 30–77 mm); length of prolongation of distal escal appendage increasing with standard length from 7.7% SL (in 30 mm specimen), to 10.8% SL (55.5 mm), to 20.8% SL (77 mm); prolongation of distal escal appendage bearing numerous lateral serrations and distal filaments ( Bertelsen and Pietsch, 1996:407, fig. 5) _ _ _ _ _ _ _ _ _ _ _ _ Lasiognathus saccostoma Regan, 1925 View in CoL
5b. Two lightly pigmented escal hooks; length of distal escal appendage 3.8% SL (in a 157 mm specimen); length of prolongation of distal escal appendage 2.9% SL (in 157 mm holotype); prolongation of distal escal appendage without lateral serrations, but bearing a series of six tiny distal filaments ( Pietsch, 2005:78, figs. 1, 2) _ _ _ _ _ _ _ _ _ _ _ _ Lasiognathus View in CoL amphirhamphus Pietsch, 2005 View in CoL
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