Hydrophis
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publication ID |
https://doi.org/ 10.11646/zootaxa.3869.4.1 |
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publication LSID |
lsid:zoobank.org:pub:8F80DD5E-F5FC-40DF-BCE5-C404FA7A6577 |
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persistent identifier |
https://treatment.plazi.org/id/038F87C0-FFAF-FFDA-FF48-FE8DFA53F9CE |
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treatment provided by |
Felipe |
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scientific name |
Hydrophis |
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A key to the genus Hydrophis and Microcephalophis gracilis
1.
A Elongated mental shield several times longer than broad ( Fig.9 View FIGURE 9 left)...................................... H. zweifeli
B Mental shield not much longer than broad ( Fig.9 View FIGURE 9 right)....................................................... 2.
2.
A Ventrals (except on the throat) divided into pairs of overlapping scales ( Fig.10 View FIGURE 10 top)......................... H. stokesii
B Ventrals in the posterior part of body divided into pairs of not overlapping scales ( Fig.10 View FIGURE 10 bottom).. Microcephalophis gracilis
C Not as above........................................................................................ 3.
3.
A Blunt spines on rear edge of some of the head shields ( Fig.11 View FIGURE 11 )........................................... H. peronii
B Not as above........................................................................................ 4.
4.
A Head elongated with snout bill-like and flattened, very wide gape ( Fig.12 View FIGURE 12 ), the normal colour pattern is yellow on ventral side and black on dorsal side........................................................................ H. platurus
B Not as above........................................................................................ 5.
5.
A Ventrals very small and difficult to distinguish, scales in the lowermost scale rows on flanks enlarged compared to dorsal scales ( Fig.13 View FIGURE 13 )................................................................................. H. curtus
B Not as above........................................................................................ 6.
6.
A Less than 275 ventrals and less than 30 scale rows around neck................................................ 7.
B Not as above........................................................................................ 8.
7.
A Between bands and on the sides two or three series of spots or dark-edged markings, head very small and body compressed posteriorly ( Fig. 14 View FIGURE 14 )......................................................................... H. macdowelli
B Not as above........................................................................................ 8.
8.
A Less than 25 scale rows around neck and more than 70 dark cross bands on body and tail....................... H. vorisi
B Not as above........................................................................................ 9.
9.
A Less than 275 ventrals and less than 44 scale rows around body............................................... 10.
B Not as above....................................................................................... 11.
10.
A Less than 38 bands on body and small dark spots on the sides............................................. H. major
B Not as above....................................................................................... 11.
11.
A Less than 37 scale rows around body, less than 320 ventrals and more than 45 bands on body and tail................. 12.
B Not as above....................................................................................... 13.
12.
A Between 57 and 69 bands on body and tail.......................................................... H. belcheri
B Between 46 and 56 bands on body and tail.......................................................... H. donaldi
13.
A More than 345 ventrals and spots on the flanks and between bands ( Fig. 15 View FIGURE 15 )............................... H. elegans
B Not as above....................................................................................... 14.
14.
A Less than 285 ventrals................................................................................ 15.
B Not as above....................................................................................... 16.
15.
A Less than 30 scale rows around neck and more than 41 scale rows around body............................. H. laboutei
B Not as above....................................................................................... 16.
16
A More than 50 scale rows around body and one or two rows of regular black pentagonal markings on the side, primary colour dark brown to black ( Fig. 16 View FIGURE 16 ).................................................................. H. czeblukovi
B Not as above....................................................................................... 17.
17.
A More than 30 scale rows around neck and body with ocelli on the sides, ground colour white ( Fig.17 View FIGURE 17 ).......... H. ocellatus
B Not as above....................................................................................... 18.
18.
A More than 30 scale rows around neck, ground colour not yellow and more than 12 maxillary teeth behind fang H. caerulescens B Not as above....................................................................................... 19. 19.
A Head small and neck elongated and body more than 3 times as broad as head.................................... 20. B Not as above....................................................................................... 22. 20.
A A white ring around the eye and less than 5 maxillary teeth behind fang.................................... H. kingii B Not as above....................................................................................... 21. 21.
A Less than 38 scale rows around neck.............................................................. H. coggeri B More than 38 scale rows around neck.............................................................. H. atriceps 22.
A More than 40 bands on body and tail............................................................. H. pacificus B Less than 40 bands on body and tail............................................................... H. coggeri
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.