Plectranthias nanus Randall
publication ID |
https://doi.org/ 10.11646/zootaxa.4918.1.1 |
publication LSID |
lsid:zoobank.org:pub:3FEF9EA2-B755-4B22-8B6A-FAFC5C0FFCDF |
DOI |
https://doi.org/10.5281/zenodo.4474409 |
persistent identifier |
https://treatment.plazi.org/id/335587B2-C409-1C6E-FF28-F92BFB23FEC4 |
treatment provided by |
Plazi |
scientific name |
Plectranthias nanus Randall |
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Plectranthias nanus Randall View in CoL
Figures 3B View FIGURE 3 , 11 View FIGURE 11 , 39 View FIGURE 39 ; Tables 1–16, 24
Common name: Dwarf Perchlet
Plectranthias nanus Randall 1980: 159 View in CoL , fig. 22, tabs 13–14 (type locality: Cocos Island, Guam, Mariana Islands; paratypes from Cocos-Keeling and Christmas Islands).— Allen & Steene 1988: 180, fig. 134 (checklist, photo, Christmas Island).— Paxton et al. 1989: 507 (checklist).— Allen & Smith-Vaniz 1994: 9 (checklist, Cocos (Keeling) Islands); Allen 2000: 87 (checklist, Christmas Island); Allen et al. 2006: 991 (checklist).— Allen & Erdmann 2012: 289 (diagnosis, photo, Christmas Island).— Hobbs et al. 2014a: 194, tab. 1 (checklist, Cocos (Keeling) Islands and Christmas Island).— Hobbs et al. 2014b: 210, tab. 1 (checklist, Cocos (Keeling) Islands and Christmas Island).— Anderson 2018: 31 View Cited Treatment (checklist). — Parenti & Randall 2020: 28 (checklist).
Diagnosis. The following combination of characters distinguishes P. nanus from all other congeners: dorsal rays X,13–16; fourth dorsal spine longest; pectoral rays 13–15, rarely 13, all rays unbranched; lateral line incomplete, with 15–21 tubed scales; greatest body depth 29.4–33.3 % SL.
Remarks. A relatively small species (maximum size 39.8 mm SL, Randall 1980), P. nanus is known in Australia from the Cocos (Keeling) Islands, Christmas Island, Great Barrier Reef and Coral Sea ( Figure 11 View FIGURE 11 ). Elsewhere, it ranges widely throughout the Indo-West Pacific, as far west as the Red Sea and as far east as the Pitcairn Islands and Hawaii ( Randall 1980; Heemstra 1996; Heemstra & Randall 2009). It closely resembles P. longimanus in coloration, and shares with it apomorphic modification of the caudal skeleton (hypurals 1 and 2 undifferentiated, versus autogenous in other studied Plectranthias species; Figure 5 View FIGURE 5 ). Characters distinguishing the two species are discussed under Remarks for P. longimanus .
In their table 1 and key for western Indian Ocean Plectranthias, Heemstra & Randall (2009) gave a count of 15 branched caudal-fin rays for this species. In their account for the species, however, they gave a range of 13–15 branched caudal rays. The latter count range agrees with the original description: “13 to 15, usually 13” ( Randall 1980: 162). All specimens examined by us had 13 (7+6) branched caudal rays.
We add the following new observations: scales with peripheral cteni; vertebrae 10+16; supraneurals 2; predorsal formula 0/0/2/1+1; dorsal pterygiophores in interneural spaces 9–13 1/1/1+1/1/1+1 or 1/1/1+1/1+1/1; no trisegmental pterygiophores associated with dorsal fin; terminal dorsal pterygiophore in interneural space 17–18; no trisegmental pterygiophores associated with anal fin; terminal dorsal pterygiophore in interneural space 5–6; ribs present on vertebrae 3 through 10; epineurals present on vertebrae 1 through 10–12; hypurals 1 and 2 represented by undifferentiated plate, other hypurals and parhypural autogenous; well-developed hypurapophysis on parhypural; epurals 3; single uroneural (posterior uroneural absent); ventral tip of cleithrum with well-developed posteroventral process; proximal tip of first anal-fin pterygiophore near distal tips of parapophyses on vertebra 10.
Morphometric data are summarised in Table 24.
Material examined. Australia. AMS I.19454-088, 2: 23–24 mm SL (radiographs only), Queensland, Great Barrier Reef, channel between Yonge and Carter Reefs , 14°35′S, 145°36′E, 1–18 m GoogleMaps , AMS team, 11 Nov 1975 ; AMS I.20430-005, 3: 15.6–22.1 mm SL, Christmas Island, Flying Fish Cove , 5–10 m, G . R. Allen & R.C. Steene , 12 Jun 1978 ; AMS I.20442-005, 25.8 mm SL, Christmas Island, Rocky Point , 10–12 m, G . R. Allen & R. Steene , 29 May 1978 ; AMS I.25112-116, 3: 20.4–29.0 mm SL (subsequently cleared and stained), Coral Sea, west edge of Osprey Reef , 0.75 km north of pass, 13°54′S, 146°33′E, 1–15 m, rotenone GoogleMaps , AMS party, 8 Nov 1984 ; WAM P.28541-039, 7: 16.4–25.1 mm SL, Coral Sea, Holmes Reef , 16°31′S, 147°50′E, 12–14 m, G GoogleMaps . R. Allen , 20 Nov 1985 ; WAM P.29637- 027, 23.9 mm SL, Coral Sea, Lihou Reef and Cays , Georgina Cay , 17°37′S, 151°26′E, 18–29 m, G GoogleMaps . R. Allen et al., 12 Nov 1987 . French Polynesia. AMS I.21646-036, 3: 23.0– 27.5 mm SL (radiographs only), Society Islands, Moorea, near Irioa Island , 17°S, 149°W, 15–20 m, B. Goldman, 18 Jun 1976 GoogleMaps .
Additional specimens identified for distribution information. Australia. AMS I.22616-035, 26.0 mm SL, Great Barrier Reef , Escape Reef North, 15°49′S, 145°50′E, coral and sand, 5–18 m GoogleMaps , AMS team, 2 Nov 1981 ; AMS I.22634-006, 31.0 mm SL, Great Barrier Reef , Escape Reef North, 15°49′S, 145°50′E, reef dropoff, 18 m, W.A. Starck, 4 Dec 1981 GoogleMaps ; AMS I.25107-032, 2: 18.0– 23.5 mm SL, Coral Sea , Osprey Reef, west edge dropoff (13°56′S, 146°34′E), 10–25 m GoogleMaps , AMS team, 6 Nov 1984 ; AMS I.28993-016, 5: 17.3–27.5 mm SL, Cocos (Keeling) Islands , west side near Wreck Point, 11°19′S, 96°49′E, G GoogleMaps . R. Allen , 23 Fed 1989 ; AMS I.33747-023, 22.5 mm SL, Coral Sea , Boot Reef, 09°58.70′S, 144°42.52′E, coral, sand and rubble, 23–30 m GoogleMaps , AMS team, 27 Jan 1993 .
R |
Departamento de Geologia, Universidad de Chile |
WAM |
Western Australian Museum |
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.
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Plectranthias nanus Randall
Gill, Anthony C., Pogonoski, John J., Moore, Glenn I. & Johnson, Jeffrey W. 2021 |
Plectranthias nanus
Parenti, P. & Randall, J. E. 2020: 28 |
Anderson, W. D. Jr 2018: 31 |
Hobbs, J. P. & Newman, S. J. & Mitsopoulos, G. E. A. & Travers, M. J. & Skepper, C. L. & Gilligan, J. J. & Allen, G. R. & Choat, H. J. & Ayling, A. M. 2014: 194 |
Hobbs, J. P. & Newman, S. & Mitsopoulos, G. E. A. & Travers, M. & Skepper, C. L. & Gilligan, J. & Allen, G. R. & Choat, H. J. & Ayling, A. M. 2014: 210 |
Allen, G. R. & Erdmann, M. V. 2012: 289 |
Allen, G. R. & Hoese, D. F. & Cross, N. J. & Bray, D. J. 2006: 991 |
Allen, G. R. 2000: 87 |
Allen, G. R. & Smith-Vaniz, W. F. 1994: 9 |
Paxton, J. R. & Hoese, D. F. & Allen, G. R. & Hanley, J. E. 1989: 507 |
Allen, G. R. & Steene, R. C. 1988: 180 |
Randall, J. E. 1980: 159 |