labridae (wrasses)
DESCRIPTION
Labridae (wrasses). Larval morphological characteristics - laterally compressed - gut straight and coils later - myomeres 23 – 28 (mostly 25) - small mouth - no head spination - very little pigment. Labridae (wrasses). Species level identification is difficult – WHY?. - PowerPoint PPT PresentationTRANSCRIPT
Labridae (wrasses)
Larval morphological characteristics
- laterally compressed
- gut straight and coils later
- myomeres 23 – 28 (mostly 25)
- small mouth
- no head spination
- very little pigment
Labridae (wrasses)
Celebes Sea Labrid Types
• General Body Shape
• Pigment Patterns
• high species number (35 genera, 300 species Indo-Pacific)
• meristic characters overlap
Species level identification is difficult – WHY?
Location: Celebes Sea
Date: August 2007
Gear: Bongo (521 um)
Labridae Type A
probably Halichoeres sp.
6.0 mm
8.6 mm
• eyes slightly narrow, choroid tissue
• long, pointed snout
• gut coiled in postflexion
• no pigment throughout larval stage
Myomeres: 23
D: IX, 13
A: III, 13
P1: 12
C: 12
Labridae Type B
probably another Thalassoma sp. (Fahay)
• general body shape similar with Type A
• dorsal spines form early
• pigments on anterior dorsal fin membrane
3.9 mm
6.0 mm
• head larger than other labrids
Myomeres: 25
D: VIII, 12
A: III, 11
P1: 14
C: 12
Labridae Type C
Probably Cirrhilabrus sp.
3.9 mm
6.0 mm
7.4 mm
• heavy pigment on dorsal portion of gut
• pigment enlarges as larvae mature
Myomeres: 25
D: XI, 9
A: III, 9
P1: 14
C: 13
Labridae Type D
Probably Cheilinus sp.
3.9 mm
6.0 mm
7.4 mm
4.6 mm
6.2 mm
• body deep
• no pigmentation
• early forming pectoral fin
Myomeres: 25
D: IX, 10
A: III, 9
P1: 14
C: 13
Labridae Type E
Probably Xyrichthys sp.
6.0 mm
11.2 mm
9.2 mm
• mouth very small
• eye elliptical, choroid tissue
• first two dorsal spines originate in nape
• gut initially straight, coils after flexion
• body elongated, very laterally compressed
• head small and pointed
Myomeres: 25
D: IX, 12
A: III, 11
P1: 12
C: 14
Scaridae (parrot fishes)
3.9 mm
11.2 mm
• gut straight initially, coiled at flexion
• gut rugose at posterior end
• eye elliptical, choroid tissue
• pigment series along base of anal fin to caudal, dorsal gut
Myomeres: 25
D: IX, 10
A: III, 9
P1: 14
C: 14
7.0 mm
6.6 mm
• body laterally compressed, ovoid in cross section
• head small, mouth small, snout round
Scaridae (parrot fishes)
3.9 mm
11.2 mm• Gobiidae same myomere count
but, no rugose gut, very conspicuous bladder, eyes round
• Myctophidae with rugose gut
but, myomeres >30, no series of pigment
7.0 mm
6.6 mm
Coryphaenidae (dolphinfishes)
Coryphaena hippurus
3.9 mm3.8 mm
11.2 mm
6.2 mm
• body elongated, head moderately blunt
• heavy pigmentation
Myomeres: 63
D: 23
A: 23
P1: 13
C: 14
Coryphaenidae (dolphinfishes)
Coryphaena hippurus
3.9 mm3.8 mm
11.2 mm
6.2 mm
Coryphaena equiselis
- no barred pigmentation
- no pigment on pelvic fin (older larvae)
Rachycentridae
- gut more heavily pigmented than body
- head slightly elongated