Pseudonereis formosa Kinberg, 1865

Conde-Vela, Víctor M., 2018, New species of Pseudonereis Kinberg, 1865 (Polychaeta: Nereididae) from the Atlantic Ocean, and a review of paragnath morphology and methodology, Zootaxa 4471 (2), pp. 245-278: 270-271

publication ID

https://doi.org/10.11646/zootaxa.4471.2.2

publication LSID

lsid:zoobank.org:pub:36312BD3-476F-476F-A953-8A6D4BE205D4

persistent identifier

http://treatment.plazi.org/id/03A2FB52-FFBB-DC15-6B93-FB27FE31FDF6

treatment provided by

Plazi

scientific name

Pseudonereis formosa Kinberg, 1865
status

 

Pseudonereis formosa Kinberg, 1865  

Pseudonereis formosa Kinberg 1865: 174   .

Pseudonereis gallapagensis Hartman 1948: 68   –69. Bakken 2007: 157 –159, Fig. 7A –F View FIGURE 7 (partim, non Kinberg, 1865).

Type locality. Honolulu , Hawaii, Pacific Ocean.  

Diagnosis (after Hartman 1948 and Bakken 2007). Two pair of eyes, rounded. Four pairs of anterior cirri, longest one reaching chaetiger 3–4. Jaws with cutting edge dentate, 5–7 teeth. Maxillary ring: I= 1 cone; II= 3 comb-like rows; III= 4 comb-like rows; IV= 4 comb-like rows. Oral ring: V= 1 cone; VI= 1-1 shield-shaped bars with pointed tips; VII –VIII= one furrow row with P-bars and one ridge row with cones in a single band, rows vertically displaced; furrow and ridge regions with one paragnath each, 18–19 paragnaths in total. Parapodial cirri pattern: dorsal cirri twice as long as notopodial dorsal ligules in anterior chaetigers, 1.5 times longer in middle and posterior chaetigers, becoming shorter in posterior-most chaetigers, basally inserted in anterior-most chaetigers, medially displaced in anterior chaetigers, subdistal in middle and posterior chaetigers, distal in posterior-most chaetigers; ventral cirri shorter than neuropodial ventral ligules and basally inserted throughout body. In posteriormost chaetigers, notopodial dorsal ligule 2.6 times longer than dorsal cirrus, twice as long as wide, 4 times longer than notopodial ventral ligule; notopodial ventral ligule 5 times longer than neuroacicular ligule. Neuroacicular ligules distally bilobed in anterior chaetigers only. Neuropodial heterogomph spinigers in sub-acicular fascicles absent throughout body. Pygidium multi-incised, anal cirri as long as last 4–5 chaetigers.

Remarks. Hartman (1948: 68) examined the types of P. gallapagensis   and P. formosa   and synonymized them because no differences were found but highlighted that the holotype of P. gallapagensis   was in poor condition. Bakken (2007: 157) reexamined both types, including additional material from Chile and Peru; he agreed with Hartman’s conclusion and retained the synonymy, redescribing P. gallapagensis   with the type material of both species, but illustrating it with the type of P. formosa   . The diagnosis presented here is based on the description by Hartman (1948) and the drawings by Bakken (2007, Fig. 7 View FIGURE 7 ).

P. gallapagensis   and P. formosa   are quite similar, especially in the large notopodial dorsal cirri with dorsal margins strongly convex in posterior-most chaetigers, but based on the available redescription of P. formosa   and the current description of P. gallapagensis   , some differences between them can be noted. In P. formosa   , notopodial dorsal ligules in middle chaetigers are oblong, laterally flattened, longer than notopodial ventral ligules, whereas in P. gallapagensis   they are subconical, subequal than notopodial ventral ligules. Moreover, in P. formosa   , notopodial dorsal ligules in posterior-most chaetigers are 4 times longer than notopodial ventral ligules, whereas in P. gallapagensis   they are 7–8 times longer. In P. formosa   , notopodial ventral ligules in posterior-most chaetigers are twice as long as neuroacicular ligules, whereas in P. gallapagensis   they are subequal. Furthermore, P. gallapagensis   has neuropodial heterogomph spinigers in sub-acicular fascicles in middle and posterior chaetigers, whereas P. formosa   lacks them throughout body. For these discrepancies, P. formosa   is herein regarded as a distinct, valid species.

Distribution. Hawaii.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Nereididae

Genus

Pseudonereis

Loc

Pseudonereis formosa Kinberg, 1865

Conde-Vela, Víctor M. 2018
2018
Loc

Pseudonereis formosa

Kinberg 1865 : 174
Loc

Pseudonereis gallapagensis

Hartman 1948 : 68
Bakken 2007 : 157