Corresponding author: Tin-Yam Chan (
Academic editor: I. S. Wehrtmann
The larvae of the deep-sea pandalid shrimp
Jiang G-C, Chan T-Y (2021) Morphology of the first three zoeal stages of the deep-sea caridean shrimp
The deep-sea pandalid shrimp genus
An ovigerous female of
The descriptions and figures were arranged according to the standards proposed by
Period from hatching to end of instar: 1–5 days.
Size (
Carapace (Fig.
Zoea I of
Antennule (Fig.
Antenna (Fig.
Mandible (Fig.
Maxillule (Fig.
Maxilla (Fig.
First maxilliped (Fig.
Second maxilliped (Fig.
Third maxilliped (Fig.
Pereiopods: Absent.
Pleon (Fig.
Pleopods: Absent.
Uropod: Absent.
Telson (Fig.
Period from hatching to end of instar: 6–8 days.
Size (
Carapace (Fig.
Zoea II of
Antennule (Fig.
Mandible (Fig.
Maxillule (Fig.
Maxilla (Fig.
First maxilliped (Fig.
Second maxilliped (Fig.
Third maxilliped (Fig.
Telson (Fig.
Period from hatching: 9 days.
Size (
Carapace (Fig.
Zoea III of
Antennule (Fig.
Antenna (Fig.
Maxillule (Fig.
Maxilla (Fig.
Third maxilliped (Fig.
Pereiopods (Fig.
Pleon (Fig.
Uropod (Fig.
Telson (Fig.
Previous studies together with the present work have shown the five species of
Characteristics of the first zoeae in five species of
Characters |
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(see |
(see |
(present study) | (see |
(see |
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0.53–0.58 | ~ 0.42 | 0.41–0.47 | 0.38–0.45 | 0.38–0.43 |
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2 | 2 | 0 | 2 | 1 |
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Peduncle tubercle | 1 small tubercle | 2 small tubercles | 1 small tubercle | 1 small tubercle | 1 small tubercle |
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Endopod setation | 5 | 6 | 6 | 5 | 5 |
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Coxal endite setation | 9+4 | 9+4 | 9+4 | 8+3 | 9+4 |
Basial endite setation | 4+4 | 5+5 | 4+4 | 4+4 | 3+4 |
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Coxal setation | 5 | 7 | 5 | 4 | 4 |
Basial setation | 11 | 12 | 11 | 10 | 9 |
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Coxal setation | 2 | 1 | 1 | 1 | 1 |
Basial setation | 8 | 9 | 9 | 9 | 6 |
Endopod setation | 3,1,2,5 | 3,1,2,4 | 3,1,2,5 | 3,1,2,5 | 2,1,2,4 |
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Endopod setation | 2,1,2,4 | 2,1,2,4 | 2,1,2,3 | 2,1,2,4 | 2,1,2,4 |
Although
Table
Characteristics of the first three zoeal stages of
Appendage | Stages | ||
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Zoea I | Zoea II | Zoea III | |
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0.41–0.47 | 0.48–0.51 | 0.60–0.63 |
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Peduncle | 1 small tubercle+1p | 3p | 6p, 2x+7p |
Primary flagellum setation | 3a+1p+1s | 5a+1x | 1a+2p+1x |
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Peduncle | 1b | 1b | 1b |
Endopod | 1p+1v | 1p+1v | 0 |
Exopod | 6- |
6- |
4- |
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Coxal endite setation | 5p | 7(1x+1pa+5p) | 7(1x+1pa+5p) |
Basial endite setation | 2t+2x | 4c+3x | 5c+3x |
Endopod setation | 1x+1sp+1sh+3(1sh+2sp) | 1x+1sp+1sh+3(1sh+2sp) | 1x+1sp+1sh+3(1sh+2sp) |
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Coxal endite setation | 9p+4p (2pe+11p) | 11p+4p | 11p+4p |
Basial endite setation | 4p+4p | 4p+5p | 4p+5p |
Endopod setation | 5- |
5- |
5- |
Exopod setation | 5p | 5p | 7p |
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Coxal setation | 2pe+3p | 7p | 7p |
Basial setation | 11p | 14p | 14p |
Endopod setation | 4- |
4- |
4- |
Exopod setation | 4p | 5p | 5p |
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Coxal setation | 1p | 1p | 1p |
Basial setation | 1pe+8p | 1pe+8p | 1pe+8p |
Endopod setation | 4- |
5- |
5- |
Exopod setation | 5p | 6p | 6p |
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Basial setation | 4p | 4p | 4p |
Endopod setation | 4- |
5- |
5- |
Exopod setation | 5p | 6p | 6p |
|
Absent | Absent | Biramous bud |
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Protopod | – | – | 0 |
Endopod | – | – | 2p |
Exopod | – | – | 6p |
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7p+7p | 8p+8p | (1x+7p)+(1x+7p) |
ZI- eyes sessile, three pairs of maxillipeds, slender rostrum slightly curved, antennule peduncle unsegmented and bearing one small tubercle, pleon with five somites.
ZII- eyes stalked, rostrum shorter than in ZI and ~ 0.4 × as long as CL, antennule peduncle bearing two plumose setae.
ZIII- antennule peduncle two segmented, pleon with six somites, first pereiopod developed, uropods with exopods.
This work was supported by research grants from the Ministry of Science and Technology, Taiwan, and the Center of Excellence for the Oceans (National Taiwan Ocean University), which is financially supported by the Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan.