First Occurrence of Speckletail Flounder, Engyophrys sanctilaurentii Jordan & Bollman 1890 (Pisces: Bothidae), in California.
Ami K. Groce (2)
Currently there are 29 species of flatfishes representing three families (Paralichthyidae, Pleuronectidae, and Cynoglossidae in California, with an additional species and family (Pacific lined sole, Achirus mazatlanus; family Achiridae) reported just below the United States-Mexico International Border (Hubbs et al. 1979; Lea et al. 1989; Lea, in prep.). This paper reports the first occurrence of the 30th species of flatfish in California and the first occurrence of the family Bothidae in the state. Seven California species (gulf sanddab, Citharichthys fragilis; Pacific sanddab, Citharichthys sordidus; speckled sanddab, Citharichthys stigmaeus; longfin sanddab, Citharichthys xanthostigma; bigmouth sole, Hippoglossina stomata; California halibut, Paralichthys californicus; and fantail sole, Xystreurys liolepis) placed in Bothidae in Robins et al. (1991) and earlier references have been placed in Paralichthyidae by most recent authoritative references (Nelson 1994, Hensley 1995b, Moser and Sumida 1996, Eschmeyer 1998).
On August 6, 1998, an unusual flatfish, 80 mm standard length (SL), was collected north of La Jolla Submarine Canyon, California (latitude 32[degrees]53.32' N and longitude 117[degrees]16.66' W) at a depth of 63 m in a 7.6-m wide (headrope) semiballoon otter trawl with 1.2-cm cod-end mesh. It was collected during the Southern California Bight 1998 Regional Survey (Bight'98), a bight-wide survey of the mainland and island shelves of southern California coordinated by the Southern California Coastal Water Research Project. Scientists working for the City of San Diego, Metropolitan Wastewater Department, Environmental Monitoring and Technical Services brought the specimen to the attention of M. J. Allen, who identified it as a speckletail flounder, Engyophrys sanctilaurentii Jordan & Bollman 1890. This specimen has been catalogued in the Scripps Institution of Oceanography (SIO) Marine Vertebrates Collection (SIO 00-81).
Although the speckletail flounder occurs commonly along the southern coast of Mexico, Central America, and northwestern South America, it had not previously been caught north of Sebastian Vizcaino Bay, Baja California, Mexico (Moser and Charter 1996). The capture of the speckletail flounder off La Jolla, California represents a range extension of 600 km north of its northernmost record (published and unpublished) and the first record of this species in California. Based on this specimen, the current geographic range of speckletail flounder is now from La Jolla, California and the northern Gulf of California (SIO 60-120: latitude 30[degrees]22.3'N longitude 113[degrees]08.0'W) to Peru (Hensley 1995a). Its range extends along the warm-temperate San Diego and Cortez Provinces and the tropical Mexican and Panamic Provinces of Briggs (1974). Speckletail flounder occurs on mud, sand, gravel, or shell bottoms at depths of 10 m (LACM 32559.004) to 232 m (Hensley 1995a), with most specimens deeper than 40 m, and is thus characteristic of the middle and outer shelf zones of Allen and Smith (1988).
The specimen has the following characteristics (Fig. 1): left-eyed; small mouth reaching to the anterior part of the eye; teeth only on the blind side; narrow interorbital ridge between eyes with a small sharp spine facing posteriorly; dorsal fin beginning slightly on blind side of head behind posterior nostril; pectoral fins relatively short; pelvic fins short, asymmetrical with the left having longer base and on ventral midline about two rays anterior to the right fin on blind side; rounded caudal fin; high arch in lateral line over the pectoral fin and a short anterior bifurcating branch; no lateral line on the blind side. The specimen has the following meristic characteristics: dorsal fin rays--81; anal fin rays--67; pectoral rays--11; pelvic fin rays--6; lateral line pores, eyed side--65; and lateral line pores, blind side-0. Body scales ctenoid and imbricating. Gill membranes entirely separate. The coloration olive tan on the eyed side with dark spots on the body and medial fins: five along each margin of body near dorsal and anal fins; three along lateral line posterior to arch; six each on dorsal and anal fins; and posterior edge of caudal fin with four dark blotches (Fig. 1). The blind side dusky posteriorly and white anteriorly with five curved, dusky bands on anterior body and head. The anterior most extends upward and backward from the cheek to dorsal margin of body, the next arches upward and backward from preopercle, the third arches backward from the opercle, the fourth (broken) arches upward and backward from the ventral body margin below the pectoral fin; and the fifth almost defines a circle behind the gut cavity.
Combining this information with that in the literature (Jordan and Evermann 1898; Norman 1934; Hensley 1995a; Moser and Charter 1996), speckletail flounder has the following ranges of meristics: dorsal fin (78-89); anal fin (66-72); pectoral fins (10-13); pelvic fins (6); caudal fin (17 total); gill rakers (3-4 upper, 6 lower); lateral line pores (64-68 eyed side, no lateral line on blind side); lateral line scales (59-68). Its maximum reported size is 200 mm total length (Hensley 1995a).
Speckletail flounder is the only California flatfish with the following characters in combination: left-eyed; small mouth (reaching anterior part of eye); jaw teeth only on the blind side; a narrow interorbital crest between the eye with a backward facing spine; dorsal and anal fins separate from caudal fin; rounded caudal fin with four to five dark blotches; five to six curved dusky bands on blind side of body; lateral line of eyed side with high arch over the pectoral fin and a short bifurcating branch anteriorly, and no lateral line on blind side; and asymmetrical pelvic fins with that of eyed side on ventral midline, having longer base, and beginning two rays more anteriorly than that of blind side. The curved dusky bands on the blind side are faint or obsolete in small individuals (Jordan and Evermann 1898) and sometimes fade in larger individuals with preservation.
This species was one of a number of species collected for the first time in California or the Southern California Bight during the 1997-1998 El Nino (Lea and Rosenblatt 2000). Speckletail flounder transforms at a length of 27-37 mm, a size typical of flatfish species spending a longer time in the plankton and settling on the middle or outer shelf habitats (Richardson and Pearcy 1977; Allen 1982; Kramer 1991; Charter and Moser 1996; Moser and Charter 1996; Moser and Sumida 1996). For comparison, eggs and larvae of California halibut are in the plankton for about one month before settling to the bottom in shallow water at 10 mm SL (Allen 1988). As speckletail flounder transforms at a larger size, it may be in the plankton for a longer period (perhaps to about three months). If so, the species could reach southern California from Sebastian Vizcaino Bay (about 600 km distance) during this period if water currents were about 7.5 cm/sec, without eddies. Extreme values for the California Current range from 2 to 10 c m/sec (Hickey 1993). Thus it is possible that speckletail flounder spawned near its reported northern limit could reach southern California during this period. It is probably more likely the specimen collected was transported north from spawning in unreported populations further north along the Baja California coast than its reported range. The generally tropical distribution of the species and the warm-temperate or cooler environment of the outer coast of Baja California suggests that the species may have expanded northward along the Baja California coast during the ocean warming of the past two decades (Smith 1995).
Speckletail flounder larvae can be taken year-round (Moser and Charter 1996). The age of the specimen collected is not known. If the 80 mm SL specimen collected in southern California represents young of the year, it may have been spawned in fall of 1998, settling in southern California between fall and early spring during the middle of the El Nino. If it is older, then its occurrence in southern California cannot be attributed to the 1997-1998 El Nino.
Little is known about the ecology or behavior of this species. However, the general body morphology as an adult (i.e., small mouth with teeth only on blind side, sharp ridge between the eyes) is quite similar to that of pleuronectid flatfishes of the genus Pleuronichthys, (Allen 1982). Given its depth range, this species may be an ecological counterpart of the hornyhead turbot, Pleuronichthys verticalis, which occurs off California and the outer coast of Baja California and of the ocellated turbot, Pleuronichthys ocellatus, which occurs in the northern Gulf of California (Fitch 1963, Allen 1982). At least among southern California flatfishes, the absence of teeth on the eyed-side of the jaws is characteristic of flatfishes that extract polychaetes from tubes and clip off clam siphons (Allen 1982). Other species of small-mouthed flatfishes with jaw teeth only on blind side apparently do not occur along the coast of Mexico south of Baja California nor off Central America (Norman 1934; Hensley 1995a,b; Sommer 19 95). There are, however, several species of paralichthyids which have reduced tooth development on jaws on the eyed side (Norman 1934; Hensley 1995b), a morphology that is somewhat less appropriate for this type of foraging behavior (Allen 1982).
There are a number of nomenclatural problems associated with the names (both scientific and common) of this species. The genus and species was first described by Jordan and Bollman (1890). The date of 1889 originally given for this citation (Jordan and Evermann 1898) is incorrect as the signature date of this document was February 5, 1890 (Hays 1952). The original species name was sancti-laurentii, named for Saint Lawrence, and referring to the gridiron-like markings on the blind side. Since that time, the name has been variously given in the literature as sancti-laurentii (Jordan and Bollman 1890; Jordan and Evermann 1898; Norman 1934), sanctilaurentii (Bussing and Lopez 1994; Eschmeyer 1998), or sanctilaurentia (Hensley 1995a; Moser and Charter 1996; Escobar-Fernandez and Siri 1997). The International Code of Zoological Nomenclature (ICZN 1999) indicates that hyphens should be removed from compound species-group names originally published with a hyphen (unless the first element is a Latin letter) and both w ords should be united. Thus the hyphenated version is not appropriate. Regarding the correct ending, 'ii' is used if the name refers to a male person and 'ia' if it refers to a quality, state of being, or disease (Jaeger 1966). The species was named after Saint Lawrence, a 3rd century AD deacon of the early Catholic church who was tortured to death by a Roman prefect on a hot grill, which branded him with gridiron marks (Kirsch 1910). Thus, 'ia' would refer to the condition of having the gridiron marks similar to those of Saint Lawrence whereas 'ii' would refer to Saint Lawrence, the person who had the gridiron marks. Although Jordan and Bollman (1890) refer to the gridiron pattern on the fish for justifying the name, the name they gave was of the person rather than the Latinized version of the grid-iron condition. Hence, it appears appropriate to maintain the original ending of the name, with the correct species name (without a hyphen) for this species being sanctilaurentii.
Published English common names for this species include 'speckletail flounder' (Bussing and Lopez 1994); 'speckled-tail flounder' (Hensley 1995a), and 'speckledtail flounder' (Escobar-Martinez and Siri 1997). The American Fisheries Society Committee on Names of Fishes (Robins et al. 1991) recommends that common names be simple and with no hyphens, unless it is necessary to avoid misunderstanding. Although there is precedent for combining plural modifiers with nouns to form compound modifying words (e.g., 'spottedtail goosefish', 'spottedfin tonguefish', and 'stripedfin ronquil') in Robins et al. (1991), there is no precedent for 'speckledtail.' 'Speckle' when combined with a noun is always treated as singular (e.g., 'specklefin midshipman', 'specklemouth eelpout'), presumably due to the generally plural nature of 'speckle.' Thus we recommend 'speckletail flounder' as the common name for this species.
The authors thank Steven Lagos of the City of San Diego Ocean Monitoring Program for retaining the specimen for further identification. We thank Atsuhiro Kubo for providing drawings of the La Jolla specimen. We also thank Phillip Hastings and H. J. Walker of Scripps Institution of Oceanography, University of California, San Diego and Richard Feeney and Jeffrey Siegel of the Natural History Museum of Los Angeles for collection information on speckletail flounder.
(1.) Southern California Coastal Water Research Project, Westminster, California, 92683
(2.) City of San Diego, Metropolitan Wastewater Department, Environmental Monitoring and Technical Services Division, San Diego, California 92106
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|Author:||Allen, M. James; Groce, Ami K.|
|Publication:||Bulletin (Southern California Academy of Sciences)|
|Date:||Dec 1, 2001|
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