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Subfamily Serraninae
Subfamily Epinephelinae
Subfamily Liopropominae
Subfamily Grammistinae
Subfamily Pseudogrammatinae
The serranids, or groupers and seabasses, are ubiquitous predators on Caribbean coral reefs and come in all shapes and sizes. Groupers are, or more accurately were, the basis of important fisheries throughout the region but have become uncommon on fished reefs and some species are even endangered. This large and diverse family is composed of several clearly-defined subfamilies. Those subfamilies with Caribbean reef-associated representatives include the numerous small seabasses and hamlets (Serraninae), the groupers (Epinephelinae), the basslets (Liopropominae), the soapfishes (Grammistinae), and the small reef bass Pseudogramma gregoryi, which may be considered either a Grammistinine or a Pseudogrammatinine. There are a number of deep-water serranids known from the region and they are included in this section.
 
Larval serranids can be recognized by their relatively wide body, particularly large terminal mouth, large round eye, continuous spinous and soft dorsal fins with stout, sometimes serrated, dorsal spines and three stout spines in the anal fin. Unfortunately, most of these characters are shared with many other percoids, including the abundant snappers (Lutjanidae) and grunts (Haemulidae). Within each family there is some variation in larval body form and meristics and often marked ontogenetic changes as well, leading to a degree of overlap in appearance and the distinction sometimes can be difficult. In general, the three families have a different look as larvae: serranids generally have large jaws with a sharp jawline (essentially a much wider gape than the others), snappers have less prominent jaws, a more sloping forehead and a non-serrated preopercular spine while grunts have distinctly smaller larvae with generally narrower bodies and the dorsal fin spines are typically short. A common feature of larval serranids not shared by the members of the other families is melanophores along the pectoral fin rays, often concentrated near the tips.
 
Although serranid larvae share the basic features listed above, the size at settlement varies widely within the family: hamlets and basslets settle very small, all less than 10 mm SL, while some epinephelines (such as Epinephelus spp.) settle particularly large, sometimes reaching up to two inches in length while still pelagic.
 
Subfamily Serraninae
 
Hypoplectrus
Serranus
Diplectrum
Distinguishing this large group of small serranid fishes from other serranid subfamilies can be subtle and dorsal and anal fin ray counts are often necessary. All of the regional serranines have ten dorsal spines while, serendipitously, the other regional serranids have nine or fewer or eleven or more. In addition, the serranines (except for the deep-water anthiines) have seven anal fin soft rays and non-serrated fin ray spines, while the remaining subfamilies of Serranidae have eight or more anal fin soft rays and sometimes serrated fin ray spines. Some larval snappers (Lutjanidae) have a similar general appearance but have eight or more anal fin soft rays (and the prominent preopercular spine). The larval grunts (Haemulidae) have twelve or more dorsal fin spines and are generally narrower-bodied. There is certainly some overlap in body shape between the narrower-bodied serranines (such as the Diplectrum spp.) and the wider-bodied haemulids, in which case dorsal fin spine counts are necessary.
The deep-water anthiine serranines are sometimes raised to their own subfamily Anthiinae, and they are the only serranines to have some species with a mode of eight anal fin soft rays.
 
There are several reef-associated Caribbean serranine genera, generally separating into two groups by dorsal fin ray counts: the numerous hamlets (Hypoplectrus spp.) with D-X,15 and the large genus of basslets (Serranus spp. +), typically with D-X,12.
 
Shallow-water Serranus spp. separate out somewhat by modal pectoral fin ray counts: a group with 14 comprising S. baldwini (13-15), S. tigrinus (14), and S. tortugarum (13-15); then S. tabacarius with 15 (sometimes 14); S. subligarius with 16 (14-17), and S. flaviventris with 16 (or 17). There are a number of deeper-water species as well: S. annularis with 13 (or 14), S. chionaraia with 14 (or 13), S. luciopercanus with 14, S. maytagi with 15-16, S. notospilus and S. phoebe with 15-16 (14-17) and S. atrobranchus with 16 (15-17).
 
The remaining shallow-water serranine genera have sometimes overlapping fin ray counts with the basslets: three Diplectrum spp.; D. bivittatum (X,12 Pect-15-16, occ. 14), D. formosum (X,12 Pect-16-17, up to 18), and D. radiale (X,12 Pect-16-18, mode 17, from the S. Caribbean); Paralabrax dewegeri (X,13-14 Pect-17); Serraniculus pumilio (X,10-11, Pect-14-15); and Schultzea beta (X,11-12 Pect-16).
 
Two deep-water serranines have fewer dorsal fin soft rays than the others: Parasphyraenops atrimanus (X,10 III,6 Pect-17) and P. incisus (X,10 III,7 Pect-17). The Centropristis spp., from the Gulf of Mexico north, also can have fewer, with 11 (one with 12) dorsal fin soft rays and A-III,7 and comprise C. fuscula (with D-X,12), C. ocyurus (Pect-17), C. philadelphica (Pect-18) and C. striata (Pect 16-19).
 
The rest of the deep-water taxa tend to have 13 or more dorsal fin soft rays and include Bullsichthys caribbaeus (X,13-14 III,7 Pect-14-15) and the anthiines. Anthiines comprise four Anthias spp. all with D-X,14-15 Pect-18-21, i.e. Anthias tenuis (III,8), A. nicholsi (III,7), A. woodsi (X,14, III,7), and A. asperilinguis (X,15, III,7); Hemanthias vivanus (X,14, III,8 Pect-18-19), H. aureorubens (X,13-16,usually 15, III,8 Pect-16-17), and H. leptus (X,14 III,8); Pronotogrammus martinicensis (X,15 (13-16) III,7-8, Pect-16-18), and, finally, Plectranthias garrupellus with the unusual fin ray count of X,16 III,7 and Pect-13. (Note: some of these latter species with eight anal fin rays have identical fin ray counts to some lutjanids.)
 Hypoplectrus spp.
 

Diagnosis: Modal fin ray counts of D-X,15 A-III,7 Pect-14 indicate the hamlets, Hypoplectrus spp. There is a "species flock" of numerous color variations of these fishes in the Caribbean, many of which can hybridize and the small juveniles are presumably indistinguishable. Variant larvae with slightly different melanophore patterns may either represent these different morphospecies or individual variation (or both). DNA analysis may not be diagnostic, since it has been difficult to find consistent sequence divergence between morphospecies, at least in Panama (McCartney et al. 2003 and Ramon et al. 2003). The Caribbean morphospecies comprise H. aberrans, H. chlorurus, H. gemma, H. gummigata, H. indigo, H. guttavarius, H. nigricans, H. providencia, H. puella, and H. unicolor. The median fin ray count can be shared with some deep-water Caribbean serranids (Anthias nicholsi and A. asperilinguis, some Hemanthias aureorubens, and Pronotogrammus martinicensis), but the latter species have more pectoral fin rays (16 or more). (R)

Analogues:
Description: Body thin, wide, and short with a somewhat-narrowed to fully-round eye and very large terminal mouth. Pectoral fins long, reaching to the vent. Pelvic fins long, reaching about three-quarters of the way to the vent. Dorsal fin base long and anal fin base short, caudal peduncle wide and short. The typical complement of melanophores on the head consists of one at the angle of the jaw and a sparse scattering on the top of the head. On the body there is one at the dorsal midline just forward of the first dorsal spine and then two large melanophores on the ventral midline of the caudal peduncle; one just behind the last anal fin ray and one just before the first procurrent caudal fin ray (the latter are often persistent through transition in serranines). Melanophores on the fins are prominent: the full complement consists of a patch on the membranes of the third to fifth dorsal fin spines, several near the base of the first three anal fin soft rays, extensively lining the membranes of the pectoral and pelvic fins and finally one at the base of the lower central caudal fin rays. Internal melanophores are present around the sacculus and along the dorsal surface of the swim bladdder and the peritoneum extending to the gut near the vent. Varying patterns are common: earlier-stage larvae can be missing the melanophores on top of the head and/or the entire anal fin, caudal peduncle, and caudal fin set of melanophores. Larvae approaching transition progressively lose the markings on their pectoral and pelvic fin rays and some larvae also develop a melanophore on the dorsal midline of the caudal peduncle (the saddle characteristic of juvenile hamlets). One or both of the ventral caudal peduncle spots occasionally are missing and sometimes the anal fin has additional melanophores (sometimes a full row) just distal to the base of the rays. A variety of additional melanophores occur in some individuals: just forward of the nasal bones, along the ventral aspect of the lower jaw, an additional melanophore on the caudal peduncle after the last anal fin ray or a second spot on the base of the caudal fin rays (usually on the upper central caudal fin rays), or a few scattered on the caudal fin rays. Pre-transitional larvae have a somewhat-narrowed vertical oval eye becoming fully round as transition approaches. Transitional larvae develop a fine scattering of discrete small surface melanophores, dense towards the anterior and fading towards the tail and the larval melanophores progressively disappear (usually starting with those on the pectoral fin rays).
Hypoplectrus sp. larva
7.2 mm SL
San Blas, Panama, SB86-1008
 
 
Hypoplectrus sp. larva
6.6 mm SL
slightly vertically narrowed eye
San Blas, Panama, SB87-222
Hypoplectrus sp. early transitional larva
7.3 mm SL
losing pectoral fin melanophores
San Blas, Panama, SB86-1004
 
Hypoplectrus sp. larva
6.2 mm SL
variant pattern, row of melanophores
on all anal fin ray membranes and a
caudal peduncle spot above midline
San Blas, Panama, SB83-179
 
Hypoplectrus sp. larva
7.0 mm SL
variant pattern, with caudal peduncle
spot on dorsal aspect
San Blas, Panama, SB86-425
Hypoplectrus sp. early transitional larva
7.0 mm SL
variant pattern, with two caudal fin spots
San Blas, Panama, SB86-623
Hypoplectrus sp. transitional larva
7.1 mm SL
variant pattern, with three spots along
ventral aspect of caudal peduncle
San Blas, Panama, SB83-156
 
Hypoplectrus sp. transitional larva
6.7 mm SL
San Blas, Panama, SB83-156
 
Serranus spp.
There are numerous species in this group and DNA sequence analyses indicate that it is likely that the genus is polyphyletic (M. Craig pers. comm.). Several species are very similar in general appearance and likely represent a clade of the wider-bodied species. Based on the shared morphology and markings of juveniles, this clade comprises S. annularis, S. baldwini, S. tabacarius, and S. tortugarum, along with some, if not all, of the deep-water Serranus spp. S. tigrinus is longer-bodied and may group with some other deep-water serranines. The conclusion awaits detailed phylogenetic studies. Nevertheless, the combination of modal pectoral fin ray counts and the patterning of black spots along the upper body of transitional larvae and juveniles should serve to separate most of the species during the transitional stage. DNA sequence analyses underway at present would be required to distinguish larvae of the numerous deep-water species.
Serranus baldwini
Diagnosis: Modal fin ray counts of D-X,12 A-III,7 Pect-14 (13-14) indicate a subset of Serranus spp. Shallow-water species with this modal fin ray count comprise S. baldwini, S. tortugarum, and S. tigrinus (deep-water species comprise S. chionaraia and S. luciopercanus). S. annularis, which is found in deeper water and is very similar in appearance to S. baldwini, has a mode of 13 pectoral fin rays but cannot be excluded from the larval type. Transitional larvae and recruits with four black patches along the base of the spinous dorsal fin indicates S. baldwini.(ML)
Analogues: New recruit S. tortugarum have only two black patches at the base of the spinous dorsal fin. New recruit S. tigrinus have a longer body and a pointed head and a black patch on the distal portion of the third through fifth dorsal spines.
Description:
 
Serannus tortugarum
 
 
 
Serranus tortugarum transitional recruit
9.9 mm SL
San Blas, Panama, SB82-
Diagnosis: Modal fin ray counts of D-X,12 A-III,7 Pect-14 (13-15) indicate a subset of Serranus spp. Shallow-water species with this modal fin ray count comprise S. baldwini, S. tortugarum, and S. tigrinus (deep-water species comprise S. chionaraia and S. luciopercanus). Transitional larvae and recruits with two black patches at the base of the spinous dorsal fin and the black markings on the mid-spinous dorsal fin on the proximal membranes indicate S. tortugarum. (ML)
Analogues: S. tabacarius recruits have the melanophores on the mid-spinous dorsal fin on the distal portion of the membranes (vs. proximal). New recruit S. annularis and S. baldwini have four black patches at the base of the spinous dorsal fin (vs. two). New recruit S. tigrinus have a longer body and a pointed head and a black patch on the distal portion of the third through fifth dorsal spines.
Description: Body thin, wide, and relatively short with a large round eye and very large terminal mouth. Pectoral and pelvic fins relatively long, reaching much of the way to the vent, dorsal fin base long and anal fin base short, caudal peduncle wide and short. Melanophores on the head only at the angle of the jaw. On the body there is a large melanophore at the ventral midline of the caudal peduncle just after the last anal fin ray and a smaller one before the start of the procurrent caudal fin rays. On the dorsal fin there are patches of melanophores on the membranes between the third and sixth spines (mid-length on the third, proximal on the fourth and fifth). Internal melanophores line the dorsal surface of the swim bladder and peritoneum extending to the gut near the vent. Transitional larvae develop melanophores in a large patch on top of the head and in a row along the dorsal midline, starting with four patches: the first just forward of the dorsal fin origin, the largest on and below the fin membranes at the fourth and fifth dorsal fin spines, then on and below the last three dorsal fin spines, then on and below the base of the third through fifth soft dorsal fin rays. At the same time the larval melanophores are lost from the pectoral and pelvic fin membranes and then from the body, with the last persisting larval melanophore the one just before the lower procurrent caudal fin rays. A broad irregular stripe of fine melanophores extends rearward from the upper edge of the operculum. Melanophores appear on the iris at about 2, 3, 5, 8, and 11 o'clock.
Serranus sp. early transitional larva
8.1 mm SL
13 pectoral fin rays
San Blas, Panama, SB86-101
 
Serranus tortugarum transitional larva
7.8 mm SL
San Blas, Panama, SB86-623
 
Serranus tortugarum late transitional larva
8.0 mm SL
San Blas, Panama, SB86-1004
 
 
Serranus tortugarum transitional recruit
9.9 mm SL
San Blas, Panama, SB82-
 
 
Serranus tabacarius
 

Diagnosis: Modal fin ray counts of D-X,12 A-III,7 Pect-15 indicate several Serranus spp. and Diplectrum bivittatum. Serranus tabacarius is the shallow-water species with this modal fin ray count (deep-water species comprise S. maytagi, S. notospilus and S. phoebe). Transitional larvae and recruits have two black patches at the base of the spinous dorsal fin (vs. S. annularis and S. baldwini) and the black markings at the distal portion of the spine membranes indicates Serranus tabacarius (vs. S. tortugarum). (ML)

Analogues: S. tortugarum recruits have the melanophores on the mid-spinous dorsal fin on the proximal portion of the membranes (vs. distal). New recruit S. annularis and S. baldwini have four black patches at the base of the spinous dorsal fin (vs. two). New recruit S. tigrinus have a longer body and a pointed head and a black patch on the distal portion of the third through fifth dorsal spines. D. bivittatum recruits have a longer body and often have 16 pectoral fin rays.
Description: Body thin, wide, and relatively short with a large eye and very large terminal mouth. Pectoral and pelvic fins relatively long, reaching much of the way to the vent, dorsal fin base long and anal fin base short, caudal peduncle wide and short. Melanophores on the head only at the angle of the jaw and at the isthmus. On the body there is a large spot below the last dorsal spines, another at the ventral midline of the caudal peduncle just after the last anal fin rays and a smaller one before the start of the procurrent caudal fin rays. On the dorsal fin there are patches of melanophores on the distal membranes between the third and eighth spines, and there are melanophores lining the distal pectoral fin ray membranes and on most of the membranes of the pelvic fins. There is often a small melanophore near the base of the first anal fin soft ray and some melanophores along the tips of the anal fin ray membranes. Internal melanophores line the dorsal surface of the swim bladder and peritoneum extending to the gut near the vent. There is an additional deep melanophore above the spine at the level of the last anal fin ray.
Serranus tabacarius larva
8.2 mm SL
note internal melanophores
San Blas, Panama, SB86-927
 
Diplectrum bivittatum
Diagnosis: Modal fin ray counts of D-X,12 A-III,7 Pect-15 and often 16, includes a wide group of serranines including Diplectrum spp. in shallow waters and Serranus atrobranchus, S. maytagi, S. notospilus, and S. phoebe along with Schultzea beta, all in deeper waters. Shallow-water Serranus spp. are less likely candidates with S. flaviventrus reportedly with 16 and sometimes 17 pectoral fin rays and S. subligarius supposedly a northern Caribbean species. Recruits and juveniles with prominent lateral stripes indicate Diplectrum spp. The two species are separated only slightly by modal pectoral fin ray counts (and scale counts): 15-16 in D. bivittatum (54-75 lateral-line scales) and 16-17 in D. formosum (46-55). This larval type could potentially include larvae of D. formosum, but it may not occur in the Western Caribbean. The remaining species in the genus, D. radiale, has a mode of 17 pectoral fin rays. (ML)
Analogues:
Description: Body thick, somewhat wide, and long with a large eye and very large terminal mouth. Pectoral and pelvic fins long, reaching more than half-way to the vent, dorsal fin base long and anal fin base short, caudal peduncle wide and short. Melanophores typically at the angle of the jaw, a cluster on the top of the head, and two stripes of small melanophores, one along the upper body only below the spinous dorsal fin and one full-length along the lateral midline. There is a row of melanophores along the base of the anal fin soft rays, one per ray, and several along the ventral midline of the caudal peduncle ending before the start of the procurrent caudal fin rays. On the fins, melanophores concentrate on the distal membranes between the dorsal spines and extensively speckled along the pectoral and pelvic fin ray membranes. There are often a few melanophores between some of the anal fin rays. On the caudal fin, there are melanophores at the base of several of the central lower segmented fin rays and a larger patch at the base of the first two or three upper segmented caudal fin rays that presents as a slight upward curve of the main body mid-lateral stripe. Internal melanophores are present along the dorsal surface of the swim bladder and peritoneum extending to the gut near the vent. Transitional larvae intensify the two stripes and the mid lateral stripe extends forward to the tip of the upper jaw and the upper stripe continues irregularly backwards to the dorsal caudal peduncle. A third short stripe develops on top of the head from the braincase towards the origin of the dorsal fin. Smaller melanophores develop between the anterior portions of the main two stripes and just above the anal fin, as well as in a series of fine patches just below the mid-lateral stripe. The larval melanophores on the pectoral and pelvic fin ray membranes disappear rapidly, those between the dorsal spines disappear last. Melanophores appear on the iris at about 3, 7, 9, and 10 o'clock.
Diplectrum bivittatum larva
12.7 mm SL
San Blas, Panama, SB84-627
 
Diplectrum bivittatum transitional larva
12.8 mm SL
San Blas, Panama, SB86-1001
 
 
 
Diplectrum bivittatum late transitional larva
12.3 mm SL
San Blas, Panama, SB86-1002
 
Diplectrum bivittatum late transitional larva
12.9 mm SL
San Blas, Panama, SB86-1008
 
Subfamily Epinephelinae
 
Epinephelus
Mycteroperca
Paranthias
This subfamily comprises the large commercially-important groupers of the region. There are a few genera that are monotypic in the region and then essentially two large grouper genera, the Epinephelus spp. and the Mycteroperca spp. The phylogenetics of the group have been recently elucidated by Craig and Hastings (2007), and they find that the Epinephelus spp. and the Mycteroperca spp. do form two large separate clades apart from the other grouper genera of the region. Interestingly, Paranthias furcifer falls within the Cephalopholis spp. clade, despite its derived form and non-benthic habits.
The basic body form and appearance of many groupers are the same and the two large genera are most easily separated by the anal fin soft ray count: usually eight (occasionally nine) in the Epinephelus spp. and usually 11 or more (rarely 10) in the Mycteroperca spp. Two small and common reef groupers, the graysby and the coney, are placed in Cephalopholis spp. (with nine instead of the usual 11 dorsal fin spines). The remaining regional epinephelines comprise Paranthias furcifer (with D-IX,18-19 A-III,9), Dermatolepis inermis (with D-XI,18-20 A-III,9), Alphestes afer (with D-XI,18-19 A-III,9), and the deep-water Gonioplectrus hispanus (with D-VIII,13 A-III,7).
Fin ray counts can identify most Caribbean epinepheline larvae to genus relatively easily. However, within genera there is a broad overlap of fin ray counts and little variation in body form, making DNA sequence analyses critical to differentiating the larval groupers.
 
 
Subfamily Liopropominae
 
 
 
 
 
 
 
Subfamily Grammistinae
Rypticus sp. A
Diagnosis: Reduced spinous dorsal fin, only 2-4 dorsal spines, and no prominent anal fin spines indicate the soapfishes, Rypticus spp. There are five species in the southern Caribbean separated into two groups by the number of dorsal spines: R. saponaceus has 3 dorsal spines (and 23-25 dorsal rays) and R. subbifrenatus has 3 or 4 dorsal spines (and 23 dorsal rays, 15 anal rays). The remaining species have only two dorsal spines: R. bistrispinus and R. bornoi (= R. macrostigmus) (the latter with 24-27 dorsal rays, 14-17 anal rays). R. maculatus is found in US waters only and R. randalli occurs from Panama to Brazil. This larval type has a much shorter second dorsal spine (which should exclude R. saponaceus), along with juvenile markings of a broad dark stripe ending in a triangular point on the caudal fin, characteristic of R. subbifrenatus and R. bistrispinus).
Description: Body relatively thick, wide, and short with a large eye and large terminal mouth. Pectoral fin rays very long, pelvic fins short, dorsal fin base relatively long and anal fin base medium, caudal peduncle wide and short. First dorsal spine prominent and covered in soft tissue, subsequent spines very short. Fins generally covered in soft tissue membranes. Very few melanophores, typically only along the pectoral fin rays.
Rypticus sp. A larva
9.6 mm SL
San Blas, Panama, SB83-168
Rypticus sp. A larva
10.5 mm SL
San Blas, Panama, SB83-169
Rypticus saponaceus
Diagnosis: Reduced spinous dorsal fin, only 2-4 dorsal spines, and no prominent anal fin spines indicate the soapfishes, Rypticus spp. There are five species in the southern Caribbean separated into two groups by the number of dorsal spines: R. saponaceus has 3 dorsal spines (and 23-25 dorsal rays) and R. subbifrenatus has 3 or 4 dorsal spines (and 23 dorsal rays, 15 anal rays). The remaining species have only two dorsal spines: R. bistrispinus and R. bornoi (= R. macrostigmus) (the latter with 24-27 dorsal rays, 14-17 anal rays). R. maculatus is found in US waters only and R. randalli occurs from Panama to Brazil. This larval type has three dorsal spines with a large second dorsal spine and a dark juvenile with reticulations and light-edged median fins characteristic of R. saponaceus.
Description: Body relatively thick, wide, and short with a large eye and large terminal mouth. Pectoral fin rays very long, pelvic fins short, dorsal fin base relatively long and anal fin base medium, caudal peduncle wide and short. Fins generally covered in soft tissue membranes. Very few melanophores, typically only along the pectoral rays.
Rypticus sp. larva, 9.6 mm SL (San Blas, Panama, SB83-168)
 
Subfamily Pseudogrammatinae
Pseudogramma gregoryi
Diagnosis: Modal fin ray counts of D-VII,18-19 A-III,15-16 indicate Pseudogramma gregoryi. (U)
Description: Body relatively thin, somewhat long and narrow with a large eye and large terminal mouth. Pectoral fin rays very long, pelvic fins short, dorsal and anal fin bases relatively long, caudal peduncle wide and short.
All contents © copyright 2006 Benjamin Victor. All rights reserved.