Thrissina evermanni

Hata, Harutaka, Mandagi, Ixchel F. & Masengi, Kawilarang W. A., 2023, Resurrection of nominal species previously regarded as junior synonyms of Thrissina baelama (Fabricius, 1775) and their re-descriptions (Teleostei: Clupeiformes: Engraulidae), Raffles Bulletin of Zoology 71, pp. 279-302 : 286-288

publication ID

https://doi.org/ 10.26107/RBZ-2023-0022

publication LSID

lsid:zoobank.org:pub:41850EF5-BDE6-4A76-9F9D-0458B9791CB8

persistent identifier

https://treatment.plazi.org/id/03EC87DD-B152-2A41-A9BD-F8CE3DE0F904

treatment provided by

Felipe

scientific name

Thrissina evermanni
status

 

Thrissina evermanni ( Jordan & Seale, 1906)

[English name: Evermann’s Baelama Anchovy ] ( Fig. 5 View Fig ; Tables 4, 8)

Anchovia evermanni View in CoL Jordan & Seale, 1906: 188, fig. 4 (type locality Apia, Upolu Island , Samoa).

Thryssa baelama View in CoL (not of Fabricius): Whitehead et al., 1988 (in part): 425 ( Fiji to Tonga); Wongratana et al., 1999 (in part): 1743 ( Fiji to Tonga).

Holotype. USNM 51719 About USNM , 105.0 mm SL, Apia , Samoa, 1902, D. S. Jordan and V. L. Kellogg.

Paratypes. 4 specimens, 84.5–98.3 mm SL: CAS-SU 8730 View Materials , 3 specimens 84.5–98.0 mm SL, Apia , Samoa; USNM 451580 About USNM , 98.3 mm SL, collected with the holotype.

Other material examined. 4 specimens, 53.7–87.3 mm SL: BMNH 1971.8.25.112–114 , 3 specimens, 53.7–62.8 mm SL, Fiji; BPBM 41796 About BPBM , 87.3 mm SL, Tonga .

Diagnosis. A species of Thrissina with the following combination of characters: short maxilla, its posterior tip not reaching to posterior margin of opercle; first supramaxilla elongated, longer than half length of second; abdomen covered with 4–6 + 8–10 = 12–16 keeled scutes; no scutes anterior to pectoral fin; 1UGR 16–18, 1LGR 21–23, 1TGR 38–40; 2UGR 13–15, 2LGR 22–24, 2TGR 36–38; 3UGR 11–12, 3LGR 13–15, 3TGR 25–27; 4UGR 10–11, 4LGR 10–12, 4TGR 20–23; no distinct black blotches on dorsal fin; caudal peduncle narrow [9.3–10.2% (mean 9.7%) of SL] and long (9.7–10.5% of SL); pre-dorsal-fin long, 50.6–52.0% of SL; snout long, 4.9–5.3% of SL.

Colour of preserved specimens. Body uniformly silver, sometimes pale. Dorsum dark brown. Upper lateral surface of body light brown. Melanophores densely scattered over entire body and head. Narrow non-pigmented ring-like band surrounding anterior part of snout. Melanophores scattered along dorsal- and caudal-fin rays. Pectoral, pelvic, and anal fins without melanophores. No distinct black blotches on dorsal fin.

Distribution. Currently known from Fiji, Tonga, and Samoa ( Fig. 4 View Fig ).

Comparisons. Thrissina evermanni (1TGR 38–40) is diagnosed by a gill raker range intermediate between those of T. samam (1TGR <37) and T. polynemoides (1TGR> 39), and T. tuberculosa (1TGR> 40) ( Fig. 6 View Fig ). Thrissina evermanni can be distinguished from T. baelama (1TGR 36–40), with which it shares very similar gill raker numbers, by the narrower caudal peduncle (9.3–10.2% of SL vs. 10.1–11.5%)], and longer pre-dorsal-fin (50.6–52.0% of SL vs. 48.0–50.4%) and snout (4.9–5.3% of SL vs. 3.9–4.8%). The long snout of T. evermanni also differentiates that species from T. polynemoides (snout length: 4.7–4.9% of SL) and T. tuberculosa (4.7–5.0%) ( Fig. 7 View Fig ). Moreover, T. evermanni has a narrower caudal peduncle than T. polynemoides (9.3–10.2% of SL in T. evermanni vs. 9.9–10.6% in T. polynemoides ). Additionally, T. evermanni differs from T. tuberculosa by lacking black blotches anteriorly on the dorsal fin (vs. several distinct black blotches present in T. tuberculosa ).

Remarks. Thrissina evermanni was originally described as Anchovia evermanni by Jordan and Seale (1906), based on five specimens collected from Apia, Upolu Island, Samoa. Although the original description designated a single specimen (USNM 51719) as the holotype, that lot included two specimens ( Fricke et al., 2022), one (105.0 mm SL, 127.7 mm TL; 1LGR 23) being untagged and the other (98.3 mm SL; 1LGR 22) with two metal tags. The former matched the original description in both specimen size [five inches in total length (ca. 12.7 cm)] and gill raker number (23 gill rakers on lower gill limb of first gill arch), and is here considered to be the holotype of the nominal species. The smaller specimen is now reregistered as USNM 451580.

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Clupeiformes

Family

Engraulidae

Genus

Thrissina

Loc

Thrissina evermanni

Hata, Harutaka, Mandagi, Ixchel F. & Masengi, Kawilarang W. A. 2023
2023
Loc

Anchovia evermanni

Jordan DS & Seale A 1906: 188
1906
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